This subpart contains test procedures required to be prescribed by DOE pursuant to section 323 of the Act.

When the test procedures of this section call for rounding off of test results, and the results fall equally between two values of the nearest dollar, kilowatt-hour, or other specified nearest value, the result shall be rounded up to the nearest higher value.

(a) Refrigerators and refrigerator-freezers. (1) The estimated annual operating cost for models without an anti-sweat heater switch shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) The average per-cycle energy consumption for the standard cycle in kilowatt-hours per cycle, determined according to appendix A of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(2) The estimated annual operating cost for models with an anti-sweat heater switch shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) Half the sum of the average per-cycle energy consumption for the standard cycle and the average per-cycle energy consumption for a test cycle type with the anti-sweat heater switch in the position set at the factory just before shipping, each in kilowatt-hours per cycle, determined according to appendix A of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(3) The estimated annual operating cost for any other specified cycle type shall be the product of the following three factors, the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) The average per-cycle energy consumption for the specified cycle type, determined according to appendix A of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(4) The energy factor, expressed in cubic feet per kilowatt-hour per cycle, shall be:

(i) For models without an anti-sweat heater switch, the quotient of:

(A) The adjusted total volume in cubic feet, determined according to appendix A of this subpart, divided by—

(B) The average per-cycle energy consumption for the standard cycle in kilowatt-hours per cycle, determined according to appendix A of this subpart, the resulting quotient then being rounded to the second decimal place; and

(ii) For models having an anti-sweat heater switch, the quotient of:

(A) The adjusted total volume in cubic feet, determined according to appendix A of this subpart, divided by—

(B) Half the sum of the average per-cycle energy consumption for the standard cycle and the average per-cycle energy consumption for a test cycle type with the anti-sweat heater switch in the position set at the factory just before shipping, each in kilowatt-hours per cycle, determined according to appendix A of this subpart, the resulting quotient then being rounded to the second decimal place.

(5) The annual energy use, expressed in kilowatt-hours per year and rounded to the nearest kilowatt-hour per year, shall be determined according to appendix A of this subpart.

(6) Other useful measures of energy consumption shall be those measures of energy consumption that the Secretary determines are likely to assist consumers in making purchasing decisions which are derived from the application of appendix A of this subpart.

(7) The following principles of interpretation shall be applied to the test procedure. The intent of the energy test procedure is to simulate typical room conditions (72 °F (22.2 °C)) with door openings, by testing at 90 °F (32.2 °C) without door openings. Except for operating characteristics that are affected by ambient temperature (for example, compressor percent run time), the unit, when tested under this test procedure, shall operate in a manner equivalent to the unit's operation while in typical room conditions.

(i) The energy used by the unit shall be calculated when a calculation is provided by the test procedure. Energy consuming components that operate in typical room conditions (including as a result of door openings, or a function of humidity), and that are not excluded by this test procedure, shall operate in an equivalent manner during energy testing under this test procedure, or be accounted for by all calculations as provided for in the test procedure. Examples:

(A) Energy saving features that are designed to operate when there are no door openings for long periods of time shall not be functional during the energy test.

(B) The defrost heater shall neither function nor turn off differently during the energy test than it would when in typical room conditions. Also, the product shall not recover differently during the defrost recovery period than it would in typical room conditions.

(C) Electric heaters that would normally operate at typical room conditions with door openings shall also operate during the energy test.

(D) Energy used during adaptive defrost shall continue to be measured and adjusted per the calculation provided in this test procedure.

(ii) DOE recognizes that there may be situations that the test procedures do not completely address. In such cases, a manufacturer must obtain a waiver in accordance with the relevant provisions of 10 CFR part 430 if:

(A) A product contains energy consuming components that operate differently during the prescribed testing than they would during representative average consumer use; and

(B) Applying the prescribed test to that product would evaluate it in a manner that is unrepresentative of its true energy consumption (thereby providing materially inaccurate comparative data).

(b) Freezers. (1) The estimated annual operating cost for freezers without an anti-sweat heater switch shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) The average per-cycle energy consumption for the standard cycle in kilowatt-hours per cycle, determined according to appendix B of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(2) The estimated annual operating cost for freezers with an anti-sweat heater switch shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) Half the sum of the average per-cycle energy consumption for the standard cycle and the average per-cycle energy consumption for a test cycle type with the anti-sweat heater switch in the position set at the factory just before shipping, each in kilowatt-hours per cycle, determined according to appendix B of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(3) The estimated annual operating cost for any other specified cycle type for freezers shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) The average per-cycle energy consumption for the specified cycle type, determined according to appendix B of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(4) The energy factor, expressed in cubic feet per kilowatt-hour per cycle, shall be:

(i) For models without an anti-sweat heater switch, the quotient of:

(A) The adjusted total volume in cubic feet, determined according to appendix B of this subpart, divided by—

(B) The average per-cycle energy consumption for the standard cycle in kilowatt-hours per cycle, determined according to appendix B of this subpart, the resulting quotient then being rounded to the second decimal place; and

(ii) For models having an anti-sweat heater switch, the quotient of:

(A) The adjusted total volume in cubic feet, determined according to appendix B of this subpart, divided by—

(B) Half the sum of the average per-cycle energy consumption for the standard cycle and the average per-cycle energy consumption for a test cycle type with the anti-sweat heater switch in the position set at the factory just before shipping, each in kilowatt-hours per cycle, determined according to appendix B of this subpart, the resulting quotient then being rounded to the second decimal place.

(5) The annual energy use, expressed in kilowatt-hours per year and rounded to the nearest kilowatt-hour per year, shall be determined according to appendix B of this subpart.

(6) Other useful measures of energy consumption for freezers shall be those measures the Secretary determines are likely to assist consumers in making purchasing decisions and are derived from the application of appendix B of this subpart.

(7) The following principles of interpretation shall be applied to the test procedure. The intent of the energy test procedure is to simulate typical room conditions (72 °F (22.2 °C)) with door openings by testing at 90 °F (32.2 °C) without door openings. Except for operating characteristics that are affected by ambient temperature (for example, compressor percent run time), the unit, when tested under this test procedure, shall operate in a manner equivalent to the unit's operation while in typical room conditions.

(i) The energy used by the unit shall be calculated when a calculation is provided by the test procedure. Energy consuming components that operate in typical room conditions (including as a result of door openings, or a function of humidity), and that are not excluded by this test procedure, shall operate in an equivalent manner during energy testing under this test procedure, or be accounted for by all calculations as provided for in the test procedure. Examples:

(A) Energy saving features that are designed to operate when there are no door openings for long periods of time shall not be functional during the energy test.

(B) The defrost heater shall neither function nor turn off differently during the energy test than it would when in typical room conditions. Also, the product shall not recover differently during the defrost recovery period than it would in typical room conditions.

(C) Electric heaters that would normally operate at typical room conditions with door openings shall also operate during the energy test.

(D) Energy used during adaptive defrost shall continue to be measured and adjusted per the calculation provided for in this test procedure.

(ii) DOE recognizes that there may be situations that the test procedures do not completely address. In such cases, a manufacturer must obtain a waiver in accordance with the relevant provisions of this part if:

(A) A product contains energy consuming components that operate differently during the prescribed testing than they would during representative average consumer use; and

(B) Applying the prescribed test to that product would evaluate it in a manner that is unrepresentative of its true energy consumption (thereby providing materially inaccurate comparative data).

(c) Dishwashers. (1) The Estimated Annual Operating Cost (EAOC) for dishwashers must be rounded to the nearest dollar per year and is defined as follows:

(i) When cold water (50 °F) is used,

EAOC = (De × ETLP) + (De × N × (M + MWS + MDO + MCO + EF−(ED/2))). Where, De = the representative average unit cost of electrical energy, in dollars per kilowatt-hour, as provided by the Secretary, ETLP = the annual combined low-power mode energy consumption in kilowatt-hours per year and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, N = the representative average dishwasher use of 215 cycles per year when EAOC is determined pursuant to appendix C1 to this subpart, and 184 cycles per year when EAOC is determined pursuant to appendix C2 to this subpart, M = the machine energy consumption per cycle, in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, MWS = the machine energy consumption per cycle for water softener regeneration, in kilowatt-hours and determined pursuant to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, MDO = for water re-use system dishwashers, the machine energy consumption per cycle during a drain out event in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, MCO = for water re-use system dishwashers, the machine energy consumption per cycle during a clean out event, in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, EF = the fan-only mode energy consumption per cycle, in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, and ED = the drying energy consumption, in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable.

(ii) When electrically heated water (120 °F or 140 °F) is used,

EAOC = (De × ETLP) + (De × N × (M + MWS + MDO + MCO + EF−(ED/2))) + (De × N × (W + WWS + WDO + WCO)). Where, De, ETLP, N, M, MWS, MDO, MCO, EF, and ED, are defined in paragraph (c)(1)(i) of this section, W = the water energy consumption per cycle, in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, WWS = the water softener regeneration water energy consumption per cycle in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, WDO = The drain out event water energy consumption per cycle in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, and WCO = The clean out event water energy consumption per cycle in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable.

(iii) When gas-heated or oil-heated water is used,

EAOCg = (De × ETLP) + (De × N × (M + MWS + MDO + MCO + EF−(ED/2))) + (Dg × N × (Wg + WWSg + WDOg + WCOg)). Where, De, ETLP, N, M, MWS, MDO, MCO, EF, and ED, are defined in paragraph (c)(1)(i) of this section, Dg = the representative average unit cost of gas or oil, as appropriate, in dollars per BTU, as provided by the Secretary, Wg = the water energy consumption per cycle, in Btus and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable. WWSg = the water softener regeneration energy consumption per cycle in Btu per cycle and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, WDOg = the drain out water energy consumption per cycle in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, and WCOg = the clean out water energy consumption per cycle in kilowatt-hours and determined according to section 5 of appendix C1 or appendix C2 to this subpart, as applicable.

(2) The estimated annual energy use, EAEU, expressed in kilowatt-hours per year must be rounded to the nearest kilowatt-hour per year and is defined as follows:

EAEU = (M + MWS + MDO + MCO + EF−(ED/2) + W + WWS + WDO + WCO) × N + ETLP Where, M, MWS, MDO, MCO, EF, ED, ETLP are all defined in paragraph (c)(1)(i) of this section and W, WWS, WDO, WCO are defined in paragraph (c)(1)(ii) of this section.

(3) The sum of the water consumption, V, the water consumption during water softener regeneration, VWS, the water consumption during drain out events for dishwashers equipped with a water re-use system, VDO, and the water consumption during clean out events for dishwashers equipped with a water re-use system, VCO, expressed in gallons per cycle and defined pursuant to section 5 of appendix C1 or appendix C2 to this subpart, as applicable, must be rounded to one decimal place.

(4) Other useful measures of energy consumption for dishwashers are those which the Secretary determines are likely to assist consumers in making purchasing decisions and which are derived from the application of appendix C1 to this subpart or appendix C2 to this subpart, as applicable.

(d) Clothes dryers. (1) The estimated annual energy consumption for clothes dryers, expressed in kilowatt-hours per year, shall be the product of the annual representative average number of clothes dryer cycles as specified in appendix D1 or D2 to this subpart, as appropriate, and the per-cycle combined total energy consumption in kilowatt-hours per cycle, determined according to section 4.6 of appendix D1 or section 4.6 of appendix D2 to this subpart, as appropriate.

(2) The estimated annual operating cost for clothes dryers shall be—

(i) For an electric clothes dryer, the product of the following three factors, with the resulting product then being rounded off to the nearest dollar per year:

(A) The annual representative average number of clothes dryer cycles as specified in appendix D1 or appendix D2 to this subpart, as appropriate;

(B) The per-cycle combined total energy consumption in kilowatt-hours per cycle, determined according to section 4.6 of appendix D1 or section 4.6 of appendix D2 to this subpart, as appropriate; and

(C) The representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary; and

(ii) For a gas clothes dryer, the product of the annual representative average number of clothes dryer cycles as specified in appendix D1 or D2 to this subpart, as appropriate, times the sum of the following three factors, with the resulting product then being rounded off to the nearest dollar per year:

(A) The product of the per-cycle gas dryer electric energy consumption in kilowatt-hours per cycle, determined according to section 4.2 of appendix D1 or section 4.2 of appendix D2 to this subpart, as appropriate, times the representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary; plus,

(B) The product of the per-cycle gas dryer gas energy consumption, in Btus per cycle, determined according to section 4.3 of appendix D1 or section 4.3 of appendix D2 to this subpart, as appropriate, times the representative average unit cost for natural gas or propane, as appropriate, in dollars per Btu as provided by the Secretary; plus,

(C) The product of the per-cycle standby mode and off mode energy consumption in kilowatt-hours per cycle, determined according to section 4.5 of appendix D1 or section 4.5 of appendix D2 to this subpart, as appropriate, times the representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary.

(3) The combined energy factor, expressed in pounds per kilowatt-hour is determined in accordance with section 4.7 of appendix D1 or section 4.7 of appendix D2 to this subpart, as appropriate, the result then being rounded off to the nearest hundredth (0.01).

(4) Other useful measures of energy consumption for clothes dryers shall be those measures of energy consumption for clothes dryers which the Secretary determines are likely to assist consumers in making purchasing decisions and which are derived from the application of appendix D1 or D2 to this subpart, as appropriate.

(e) Water heaters. (1) The estimated annual operating cost is calculated as:

(i) For a gas-fired or oil-fired water heater, the sum of:

(A) The product of the annual gas or oil energy consumption, determined according to section 6.3.11 or 6.4.7 of appendix E to this subpart, times the representative average unit cost of gas or oil, as appropriate, in dollars per Btu as provided by the Secretary; plus

(B) The product of the annual electric energy consumption, determined according to section 6.3.10 or 6.4.6 of appendix E to this subpart, times the representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary. Round the resulting sum to the nearest dollar per year.

(ii) For an electric water heater, the product of the annual energy consumption, determined according to section 6.3.10 or 6.4.6 of appendix E to this subpart, times the representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary. Round the resulting product to the nearest dollar per year.

(2) For an individual unit, the uniform energy factor is rounded to the nearest 0.01 and determined in accordance with section 6.3.8 or section 6.4.4 of appendix E to this subpart.

(f) Room air conditioners. (1) Determine cooling capacity, expressed in British thermal units per hour (Btu/h), as follows:

(i) For a single-speed room air conditioner, determine the cooling capacity in accordance with section 4.1.2 of appendix F of this subpart.

(ii) For a variable-speed room air conditioner, determine the cooling capacity in accordance with section 4.1.2 of appendix F of this subpart for test condition 1 in Table 1 of appendix F of this subpart.

(2) Determine electrical power input, expressed in watts (W) as follows:

(i) For a single-speed room air conditioner, determine the electrical power input in accordance with section 4.1.2 of appendix F of this subpart.

(ii) For a variable-speed room air conditioner, determine the electrical power input in accordance with section 4.1.2 of appendix F of this subpart, for test condition 1 in Table 1 of appendix F of this subpart.

(3) Determine the combined energy efficiency ratio (CEER), expressed in British thermal units per watt-hour (Btu/Wh) and as follows:

(i) For a single-speed room air conditioner, determine the CEER in accordance with section 5.2.2 of appendix F of this subpart.

(ii) For a variable-speed room air conditioner, determine the CEER in accordance with section 5.3.11 of appendix F of this subpart.

(4) Determine the estimated annual operating cost for a room air conditioner, expressed in dollars per year, by multiplying the following two factors and rounding as directed:

(i) For single-speed room air conditioners, the sum of AECcool and AECia/om, determined in accordance with section 5.2.1 and section 5.1, respectively, of appendix F of this subpart. For variable-speed room air conditioners, the sum of AECwt and AECia/om, determined in accordance with section 5.3.4 and section 5.1, respectively, of appendix F of this subpart; and

(ii) A representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary. Round the resulting product to the nearest dollar per year.

(g) Unvented home heating equipment. (1) The estimated annual operating cost for primary electric heaters, shall be the product of:

(i) The average annual electric energy consumption in kilowatt-hours per year, determined according to section 3.1 of appendix G of this subpart and

(ii) the representative average unit cost in dollars per kilowatt-hour as provided pursuant to section 323(b)(2) of the Act, the resulting product then being rounded off to the nearest dollar per year.

(2) The estimated regional annual operating cost for primary electric heaters, shall be the product of: (i) The regional annual electric energy consumption in kilowatt-hours per year for primary heaters determined according to section 3.2 of appendix G of this subpart and (ii) the representative average unit cost in dollars per kilowatt-hour as provided pursuant to section 323(b)(2) of the Act, the resulting product then being rounded off to the nearest dollar per year.

(3) The estimated operating cost per million Btu output shall be—

(i) For primary and supplementary electric heaters and unvented gas and oil heaters without an auxiliary electric system, the product of:

(A) One million; and

(B) The representative unit cost in dollars per Btu for natural gas, propane, or oil, as provided pursuant to section 323(b)(2) of the Act as appropriate, or the quotient of the representative unit cost in dollars per kilowatt-hour, as provided pursuant to section 323(b)(2) of the Act, divided by 3,412 Btu per kilowatt hour, the resulting product then being rounded off to the nearest 0.01 dollar per million Btu output; and

(ii) For unvented gas and oil heaters with an auxiliary electric system, the product of: (A) The quotient of one million divided by the rated output in Btu's per hour as determined in 3.4 of appendix G of this subpart; and (B) the sum of: (1) The product of the maximum fuel input in Btu's per hour as determined in 2.2. of this appendix times the representative unit cost in dollars per Btu for natural gas, propane, or oil, as appropriate, as provided pursuant to section 323(b)(2) of the Act, plus (2) the product of the maximum auxiliary electric power in kilowatts as determined in 2.1 of appendix G of this subpart times the representative unit cost in dollars per kilowatt-hour as provided pursuant to section 323(b)(2) of the Act, the resulting quantity shall be rounded off to the nearest 0.01 dollar per million Btu output.

(4) The rated output for unvented heaters is the rated output as determined according to either sections 3.3 or 3.4 of appendix G of this subpart, as appropriate, with the result being rounded to the nearest 100 Btu per hour.

(5) Other useful measures of energy consumption for unvented home heating equipment shall be those measures of energy consumption for unvented home heating equipment which the Secretary determines are likely to assist consumers in making purchasing decisions and which are derived from the application of appendix G of this subpart.

(h) Television sets. The power consumption of a television set, expressed in watts, including on and standby modes, shall be determined in accordance with sections 3 and 4 of appendix H of this subpart respectively. The annual energy consumption, expressed in kilowatt-hours per year, shall be determined in accordance with section 4 of appendix H of this subpart.

(i) Cooking products. (1) Determine the standby power for microwave ovens, excluding any microwave oven component of a combined cooking product, according to section 3.2.3 of appendix I to this subpart. Round standby power to the nearest 0.1 watt.

(2)(i) Determine the integrated annual energy consumption of a conventional electric cooking top, including any conventional cooking top component of a combined cooking product, according to section 4.3.1 of appendix I1 to this subpart. Round the result to the nearest 1 kilowatt-hour (kWh) per year.

(ii) Determine the integrated annual energy consumption of a conventional gas cooking top, including any conventional cooking top component of a combined cooking product, according to section 4.3.2 of appendix I1 to this subpart. Round the result to the nearest 1 kilo-British thermal unit (kBtu) per year.

(3) Determine the total annual gas energy consumption of a conventional gas cooking top, including any conventional cooking top component of a combined cooking product, according to section 4.1.2.2.1 of appendix I1 to this subpart. Round the result to the nearest 1 kBtu per year.

(4)(i) Determine the total annual electrical energy consumption of a conventional electric cooking top, including any conventional cooking top component of a combined cooking product, as the integrated annual energy consumption of the conventional electric cooking top, as determined in paragraph (i)(2)(i) of this section.

(ii) Determine the total annual electrical energy consumption of a conventional gas cooking top, including any conventional cooking top component of a combined cooking product, as follows, rounded to the nearest 1 kWh per year:

ETGE = EAGE + ETLP Where: EAGE is the conventional gas cooking top annual active mode electrical energy consumption as defined in section 4.1.2.2.2 of appendix I1 to this subpart, and ETLP is the combined low-power mode energy consumption as defined in section 4.1 of appendix I1 to this subpart.

(5) Determine the estimated annual operating cost corresponding to the energy consumption of a conventional cooking top, including any conventional cooking top component of a combined cooking product, as follows, rounded to the nearest dollar per year:

(ETGE × CKWH) + (ETGG × CKBTU) Where: ETGE is the total annual electrical energy consumption for any electric energy usage, in kilowatt-hours (kWh) per year, as determined in accordance with paragraph (i)(4) of this section; CKWH is the representative average unit cost for electricity, in dollars per kWh, as provided pursuant to section 323(b)(2) of the Act; ETGG is the total annual gas energy consumption, in kBtu per year, as determined in accordance with paragraph (i)(3) of this section; and CKBTU is the representative average unit cost for natural gas or propane, in dollars per kBtu, as provided pursuant to section 323(b)(2) of the Act, for conventional gas cooking tops that operate with natural gas or with LP-gas, respectively.

(6) Other useful measures of energy consumption for conventional cooking tops shall be the measures of energy consumption that the Secretary determines are likely to assist consumers in making purchasing decisions and that are derived from the application of appendix I1 to this subpart.

(j) Clothes washers. (1) The estimated annual operating cost for automatic and semi-automatic clothes washers must be rounded off to the nearest dollar per year and is defined as follows:

(i) When using appendix J (see the note at the beginning of appendix J),

(A) When electrically heated water is used,

(N × (MET + HET + ETLP) × CKWH) Where: N = the representative average residential clothes washer use of 234 cycles per year according to appendix J, MET = the total weighted per-cycle machine electrical energy consumption, in kilowatt-hours per cycle, determined according to section 4.1.6 of appendix J, HET = the total weighted per-cycle hot water energy consumption using an electrical water heater, in kilowatt-hours per cycle, determined according to section 4.1.3 of appendix J, ETLP = the per-cycle combined low-power mode energy consumption, in kilowatt-hours per cycle, determined according to section 4.6.2 of appendix J, and CKWH = the representative average unit cost, in dollars per kilowatt-hour, as provided by the Secretary.

(B) When gas-heated or oil-heated water is used,

(N × (((MET + ETLP) × CKWH) + (HETG × CBTU))) Where: N, MET, ETLP, and CKWH are defined in paragraph (j)(1)(i)(A) of this section, HETG = the total per-cycle hot water energy consumption using gas-heated or oil-heated water, in Btu per cycle, determined according to section 4.1.4 of appendix J, and CBTU = the representative average unit cost, in dollars per Btu for oil or gas, as appropriate, as provided by the Secretary.

(ii) When using appendix J2 (see the note at the beginning of appendix J2),

(A) When electrically heated water is used

(N2 × (ETE2 + ETLP2) × CKWH) Where: N2 = the representative average residential clothes washer use of 295 cycles per year according to appendix J2, ETE2 = the total per-cycle energy consumption when electrically heated water is used, in kilowatt-hours per cycle, determined according to section 4.1.7 of appendix J2, ETLP2 = the per-cycle combined low-power mode energy consumption, in kilowatt-hours per cycle, determined according to section 4.4 of appendix J2, and CKWH = the representative average unit cost, in dollars per kilowatt-hour, as provided by the Secretary

(B) When gas-heated or oil-heated water is used,

(N2 × (((MET2 + ETLP2) × CKWH) + (HETG2 × CBTU))) Where: N2, ETLP2, and CKWH are defined in paragraph (j)(1)(ii)(A) of this section, MET2 = the total weighted per-cycle machine electrical energy consumption, in kilowatt-hours per cycle, determined according to section 4.1.6 of appendix J2, HETG2 = the total per-cycle hot water energy consumption using gas-heated or oil-heated water, in Btu per cycle, determined according to section 4.1.4 of appendix J2, and CBTU = the representative average unit cost, in dollars per Btu for oil or gas, as appropriate, as provided by the Secretary.

(2)(i) The integrated modified energy factor for automatic and semi-automatic clothes washers is determined according to section 4.6 of appendix J2 (when using appendix J2). The result shall be rounded off to the nearest 0.01 cubic foot per kilowatt-hour per cycle.

(ii) The energy efficiency ratio for automatic and semi-automatic clothes washers is determined according to section 4.9 of appendix J (when using appendix J). The result shall be rounded to the nearest 0.01 pound per kilowatt-hour per cycle.

(3) The annual water consumption of a clothes washer must be determined as:

(i) When using appendix J, the product of the representative average-use of 234 cycles per year and the total weighted per-cycle water consumption in gallons per cycle determined according to section 4.2.4 of appendix J.

(ii) When using appendix J2, the product of the representative average-use of 295 cycles per year and the total weighted per-cycle water consumption for all wash cycles, in gallons per cycle, determined according to section 4.2.11 of appendix J2.

(4)(i) The integrated water factor must be determined according to section 4.2.12 of appendix J2, with the result rounded to the nearest 0.1 gallons per cycle per cubic foot.

(ii) The water efficiency ratio for automatic and semi-automatic clothes washers is determined according to section 4.7 of appendix J (when using appendix J). The result shall be rounded to the nearest 0.01 pound per gallon per cycle.

(5) Other useful measures of energy consumption for automatic or semi-automatic clothes washers shall be those measures of energy consumption that the Secretary determines are likely to assist consumers in making purchasing decisions and that are derived from the application of appendix J or appendix J2, as appropriate.

(k)-(l) [Reserved]

(m) Central air conditioners and heat pumps. See the note at the beginning of appendix M and M1 to determine the appropriate test method. Determine all values discussed in this section using a single appendix.

(1) Determine cooling capacity from the steady-state wet-coil test (A or A2 Test), as described in section 3.2 of appendix M or M1 to this subpart, and rounded off to the nearest

(i) To the nearest 50 Btu/h if cooling capacity is less than 20,000 Btu/h;

(ii) To the nearest 100 Btu/h if cooling capacity is greater than or equal to 20,000 Btu/h but less than 38,000 Btu/h; and

(iii) To the nearest 250 Btu/h if cooling capacity is greater than or equal to 38,000 Btu/h and less than 65,000 Btu/h.

(2) Determine seasonal energy efficiency ratio (SEER) as described in section 4.1 of appendix M to this subpart or seasonal energy efficiency ratio 2 (SEER2) as described in section 4.1 of appendix M1 to this subpart, and round off to the nearest 0.025 Btu/W-h.

(3) Determine energy efficiency ratio (EER) as described in section 4.6 of appendix M or M1 to this subpart, and round off to the nearest 0.025 Btu/W-h. The EER from the A or A2 test, whichever applies, when tested in accordance with appendix M1 to this subpart, is referred to as EER2.

(4) Determine heating seasonal performance factors (HSPF) as described in section 4.2 of appendix M to this subpart or heating seasonal performance factors 2 (HSPF2) as described in section 4.2 of appendix M1 to this subpart, and round off to the nearest 0.025 Btu/W-h.

(5) Determine average off mode power consumption as described in section 4.3 of appendix M or M1 to this subpart, and round off to the nearest 0.5 W.

(6) Determine all other measures of energy efficiency or consumption or other useful measures of performance using appendix M or M1 of this subpart.

(n) Furnaces. (1) The estimated annual operating cost for furnaces is the sum of:

(i) The product of the average annual fuel energy consumption, in Btu's per year for gas or oil furnaces or in kilowatt-hours per year for electric furnaces, determined according to section 10.2.2 or 10.3 of appendix N of this subpart, respectively, (for furnaces, excluding low pressure steam or hot water boilers and electric boilers) or section 10.2.2 or 10.3 of appendix EE of this subpart, respectively (for low pressure steam or hot water boilers and electric boilers), and the representative average unit cost in dollars per Btu for gas or oil, or dollars per kilowatt-hour for electric, as appropriate, as provided pursuant to section 323(b)(2) of the Act; plus

(ii) The product of the average annual auxiliary electric energy consumption in kilowatt-hours per year determined according to section 10.2.3 of appendix N of this subpart (for furnaces, excluding low pressure steam or hot water boilers and electric boilers) or section 10.2.3 of appendix EE of this subpart (for low pressure steam or hot water boilers and electric boilers) of this subpart, and the representative average unit cost in dollars per kilowatt-hour as provided pursuant to section 323(b)(2) of the Act.

(iii) Round the resulting sum to the nearest dollar per year.

(2) The annual fuel utilization efficiency (AFUE) for furnaces, expressed in percent, is the ratio of the annual fuel output of useful energy delivered to the heated space to the annual fuel energy input to the furnace.

(i) For gas and oil furnaces, determine AFUE according to section 10.1 of appendix N (for furnaces, excluding low pressure steam or hot water boilers and electric boilers) or section 10.1 of appendix EE (for low pressure steam or hot water boilers and electric boilers) of this subpart, as applicable.

(ii) For electric furnaces, excluding electric boilers, determine AFUE in accordance with section 11.1 of ANSI/ASHRAE 103-1993 (incorporated by reference, see § 430.3); for electric boilers, determine AFUE in accordance with section 11.1 of ANSI/ASHRAE 103-2017 (incorporated by reference, see § 430.3).

(iii) Round the AFUE to one-tenth of a percentage point.

(3) The estimated regional annual operating cost for furnaces is calculated as follows:

(i) When using appendix N of this subpart for furnaces excluding low pressure steam or hot water boilers and electric boilers (see the note at the beginning of appendix N of this subpart),

(A) For gas or oil-fueled furnaces,

(EFR × CBTU) + (EAER × CKWH) Where: EFR = the regional annual fuel energy consumption in Btu per year, determined according to section 10.7.1 of appendix N of this subpart; CBTU = the representative average unit cost in dollars per Btu of gas or oil, as provided pursuant to section 323(b)(2) of the Act; EAER = the regional annual auxiliary electrical energy consumption in kilowatt-hours per year, determined according to section 10.7.2 of appendix N of this subpart; and CKWH = the representative average unit cost in dollars per kilowatt-hour of electricity, as provided pursuant to section 323(b)(2) of the Act.

(B) For electric furnaces,

(EER × CKWH) Where: EER = the regional annual fuel energy consumption in kilowatt-hours per year, determined according to section 10.7.3 of appendix N of this subpart; and CKWH is as defined in paragraph (n)(3)(i)(A) of this section.

(ii) When using appendix EE of this subpart for low pressure steam or hot water boilers and electric boilers (see the note at the beginning of appendix EE of this subpart),

(A) For gas or oil-fueled boilers,

(EER × CBTU) + (EAER × CKWH) Where: EFR = the regional annual fuel energy consumption in Btu per year, determined according to section 10.5.1 of appendix EE of this subpart; CBTU and CKWH are as defined in paragraph (n)(3)(i)(A) of this section; and EAER = the regional annual auxiliary electrical energy consumption in kilowatt-hours per year, determined according to section 10.5.2 of appendix EE of this subpart.

(B) For electric boilers,

(EER × CKWH) Where: EER = the regional annual fuel energy consumption in kilowatt-hours per year, determined according to section 10.5.3 of appendix EE of this subpart; and CKWH is as defined in paragraph (n)(3)(i)(A) of this section.

(iii) Round the estimated regional annual operating cost to the nearest dollar per year.

(4) The energy factor for furnaces, expressed in percent, is the ratio of annual fuel output of useful energy delivered to the heated space to the total annual energy input to the furnace determined according to either section 10.6 of appendix N of this subpart (for furnaces, excluding low pressure steam or hot water boilers and electric boilers) or section 10.4 of appendix EE of this subpart (for low pressure steam or hot water boilers and electric boilers), as applicable.

(5) The average standby mode and off mode electrical power consumption for furnaces shall be determined according to section 8.10 of appendix N of this subpart (for furnaces, excluding low pressure steam or hot water boilers and electric boilers) or section 8.9 of appendix EE of this subpart (for low pressure steam or hot water boilers and electric boilers), as applicable. Round the average standby mode and off mode electrical power consumption to the nearest tenth of a watt.

(6) Other useful measures of energy consumption for furnaces shall be those measures of energy consumption which the Secretary determines are likely to assist consumers in making purchasing decisions and which are derived from the application of appendix N of this subpart (for furnaces, excluding low pressure steam or hot water boilers and electric boilers) or appendix EE of this subpart (for low pressure steam or hot water boilers and electric boilers).

(o) Vented home heating equipment. (1) When determining the annual fuel utilization efficiency (AFUE) of vented home heating equipment (see the note at the beginning of appendix O), expressed in percent (%), calculate AFUE in accordance with section 4.1.17 of appendix O of this subpart for vented heaters without either manual controls or thermal stack dampers; in accordance with section 4.2.6 of appendix O of this subpart for vented heaters equipped with manual controls; or in accordance with section 4.3.7 of appendix O of this subpart for vented heaters equipped with thermal stack dampers.

(2) When estimating the annual operating cost for vented home heating equipment, calculate the sum of:

(i) The product of the average annual fuel energy consumption, in Btus per year for natural gas, propane, or oil fueled vented home heating equipment, determined according to section 4.6.2 of appendix O of this subpart, and the representative average unit cost in dollars per Btu for natural gas, propane, or oil, as appropriate, as provided pursuant to section 323(b)(2) of the Act; plus

(ii) The product of the average annual auxiliary electric energy consumption in kilowatt-hours per year determined according to section 4.6.3 of appendix O of this subpart, and the representative average unit cost in dollars per kilowatt-hours as provided pursuant to section 323(b)(2) of the Act. Round the resulting sum to the nearest dollar per year.

(3) When estimating the operating cost per million Btu output for gas or oil vented home heating equipment with an auxiliary electric system, calculate the product of:

(i) The quotient of one million Btu divided by the sum of:

(A) The product of the maximum fuel input in Btus per hour as determined in sections 3.1.1 or 3.1.2 of appendix O of this subpart times the annual fuel utilization efficiency in percent as determined in sections 4.1.17, 4.2.6, or 4.3.7 of this appendix (as appropriate) divided by 100, plus

(B) The product of the maximum electric power in watts as determined in section 3.1.3 of appendix O of this subpart times the quantity 3.412; and

(ii) The sum of:

(A) the product of the maximum fuel input in Btus per hour as determined in sections 3.1.1 or 3.1.2 of this appendix times the representative unit cost in dollars per Btu for natural gas, propane, or oil, as appropriate, as provided pursuant to section 323(b)(2) of the Act; plus

(B) the product of the maximum auxiliary electric power in kilowatts as determined in section 3.1.3 of appendix O of this subpart times the representative unit cost in dollars per kilowatt-hour as provided pursuant to section 323(b)(2) of the Act. Round the resulting quantity to the nearest 0.01 dollar per million Btu output.

(p) Pool heaters. (1) Determine the thermal efficiency (Et) of a pool heater expressed as a percent (%) in accordance with section 5.1 of appendix P to this subpart.

(2) Determine the integrated thermal efficiency (TEI) of a pool heater expressed as a percent (%) in accordance with section 5.4 of appendix P to this subpart.

(3) When estimating the annual operating cost of pool heaters, calculate the sum of:

(i) The product of the average annual fossil fuel energy consumption, in Btus per year, determined according to section 5.2 of appendix P to this subpart, and the representative average unit cost in dollars per Btu for natural gas or oil, as appropriate, as provided pursuant to section 323(b)(2) of the Act; plus

(ii) The product of the average annual electrical energy consumption in kilowatt-hours per year determined according to section 5.3 of appendix P to this subpart and converted to kilowatt-hours using a conversion factor of 3412 Btus = 1 kilowatt-hour, and the representative average unit cost in dollars per kilowatt-hours as provided pursuant to section 323(b)(2) of the Act. Round the resulting sum to the nearest dollar per year.

(q) Fluorescent lamp ballasts. (1) Calculate ballast luminous efficiency (BLE) using appendix Q to this subpart.

(2) Calculate power factor using appendix Q to this subpart.

(r) General service fluorescent lamps, general service incandescent lamps, and incandescent reflector lamps. Measure initial lumen output, initial input power, initial lamp efficacy, color rendering index (CRI), correlated color temperature (CCT), and time to failure of GSFLs, IRLs, and GSILs, as applicable, in accordance with appendix R to this subpart.

(s) Faucets. Measure the water use for lavatory faucets, lavatory replacement aerators, kitchen faucets, and kitchen replacement aerators, in gallons or liters per minute (gpm or L/min), in accordance to section 2.1 of appendix S of this subpart. Measure the water use for metering faucets, in gallons or liters per cycle (gal/cycle or L/cycle), in accordance to section 2.1 of appendix S of this subpart.

(t) Showerheads. Measure the water use for showerheads, in gallons or liters per minute (gpm or L/min), in accordance to section 2.2 of appendix S of this subpart.

(u) Water closets. Measure the water use for water closets, expressed in gallons or liters per flush (gpf or Lpf), in accordance with section 3(a) of appendix T to this subpart.

(v) Urinals. Measure the water use for urinals, expressed in gallons or liters per flush (gpf or Lpf), in accordance with section 3(b) of appendix T to this subpart.

(w) Ceiling fans. Measure the following attributes of a single ceiling fan in accordance with appendix U to this subpart: airflow; power consumption; ceiling fan efficiency, as applicable; ceiling fan energy index (CFEI), as applicable; standby power, as applicable; distance between the ceiling and lowest point of fan blades; blade span; blade edge thickness; and blade revolutions per minute (RPM).

(x) Ceiling fan light kits.

(1) For each ceiling fan light kit that requires compliance with the January 21, 2020 energy conservation standards:

(i) For a ceiling fan light kit packaged with compact fluorescent lamps, measure lamp efficacy, lumen maintenance at 1,000 hours, lumen maintenance at 40 percent of lifetime, rapid cycle stress test, and time to failure in accordance with paragraph (y) of this section for each lamp basic model.

(ii) For a ceiling fan light kit packaged with general service fluorescent lamps, measure lamp efficacy in accordance with paragraph (r) of this section for each lamp basic model.

(iii) For a ceiling fan light kit packaged with incandescent lamps, measure lamp efficacy in accordance with paragraph (r) of this section for each lamp basic model.

(iv) For a ceiling fan light kit packaged with integrated LED lamps, measure lamp efficacy in accordance with paragraph (ee) of this section for each lamp basic model.

(v) For a ceiling fan light kit packaged with other fluorescent lamps (not compact fluorescent lamps or general service fluorescent lamps), packaged with consumer-replaceable SSL (not integrated LED lamps), packaged with non-consumer-replaceable SSL, or packaged with other SSL lamps that have an ANSI standard base (not integrated LED lamps), measure efficacy in accordance with section 3 of appendix V of this subpart for each lamp basic model, consumer-replaceable SSL basic model, or non-consumer-replaceable SSL basic model.

(2) [Reserved]

(y) Compact fluorescent lamps. (1) Measure initial lumen output, input power, initial lamp efficacy, lumen maintenance at 1,000 hours, lumen maintenance at 40 percent of lifetime of a compact fluorescent lamp (as defined in 10 CFR 430.2), color rendering index (CRI), correlated color temperature (CCT), power factor, start time, standby mode energy consumption, and time to failure in accordance with appendix W of this subpart. Express time to failure in hours.

(2) Conduct the rapid cycle stress test in accordance with section 3.3 of appendix W of this subpart.

(z) Dehumidifiers. (1) Determine the capacity, expressed in pints/day, according to section 5.2 of appendix X1 to this subpart.

(2) Determine the integrated energy factor, expressed in L/kWh, according to section 5.4 of appendix X1 to this subpart.

(3) Determine the case volume, expressed in cubic feet, for whole-home dehumidifiers in accordance with section 5.7 of appendix X1 of this subpart.

(aa) Battery Chargers. (1) For battery chargers subject to compliance with the relevant standard at § 430.32(z) as that standard appeared in the January 1, 2022, edition of 10 CFR parts 200-499:

(i) Measure the maintenance mode power, standby power, off mode power, battery discharge energy, 24-hour energy consumption and measured duration of the charge and maintenance mode test for a battery charger other than uninterruptible power supplies in accordance with appendix Y to this subpart;

(ii) Calculate the unit energy consumption of a battery charger other than uninterruptible power supplies in accordance with appendix Y to this subpart;

(iii) Calculate the average load adjusted efficiency of an uninterruptible power supply in accordance with appendix Y to this subpart.

(2) For a battery charger subject to compliance with any amended relevant standard provided in § 430.32 that is published after September 8, 2022:

(i) Measure active mode energy, maintenance mode power, no-battery mode power, off mode power and battery discharge energy for a battery charger other than uninterruptible power supplies in accordance with appendix Y1 to this subpart.

(ii) Calculate the standby power of a battery charger other than uninterruptible power supplies in accordance with appendix Y1, to this subpart.

(iii) Calculate the average load adjusted efficiency of an uninterruptible power supply in accordance with appendix Y1 to this subpart.

(bb) External Power Supplies. The energy consumption of an external power supply, including active-mode efficiency expressed as a percentage and the no-load, off, and standby mode energy consumption levels expressed in watts, shall be measured in accordance with appendix Z of this subpart.

(cc) Furnace Fans. The energy consumption of a single unit of a furnace fan basic model expressed in watts per 1000 cubic feet per minute (cfm) to the nearest integer shall be calculated in accordance with Appendix AA of this subpart.

(dd) Portable air conditioners.

(1) When using appendix CC to this subpart, measure the seasonally adjusted cooling capacity (“SACC”) in British thermal units per hour (Btu/h), and the combined energy efficiency ratio, in British thermal units per watt-hour (Btu/Wh) in accordance with sections 5.2 and 5.4 of appendix CC to this subpart, respectively. When using appendix CC1 to this subpart, measure the SACC in Btu/h, and the combined energy efficiency ratio, in Btu/Wh in accordance with sections 5.2 and 5.4, respectively, of appendix CC1 to this subpart.

(2) When using appendix CC to this subpart, determine the estimated annual operating cost for portable air conditioners, in dollars per year and rounded to the nearest whole number, by multiplying a representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary by the total annual energy consumption (“AEC”), determined as follows:

(i) For dual-duct single-speed portable air conditioners, the sum of AECDD_95 multiplied by 0.2, AECDD_83 multiplied by 0.8, and AECT as measured in accordance with section 5.3 of appendix CC to this subpart.

(ii) For single-duct single-speed portable air conditioners, the sum of AECSD and AECT as measured in accordance with section 5.3 of appendix CC to this subpart.

(iii) For dual-duct variable-speed portable air conditioners the overall sum of

(A) The sum of AECDD_95_Full and AECia/om, multiplied by 0.2, and

(B) The sum of AECDD_83_Low and AECia/om, multiplied by 0.8, as measured in accordance with section 5.3 of appendix CC to this subpart.

(iv) For single-duct variable-speed portable air conditioners, the overall sum of

(A) The sum of AECSD_Full and AECia/om, multiplied by 0.2, and

(B) The sum of AECSD_Low and AECia/om, multiplied by 0.8, as measured in accordance with section 5.3 of appendix CC to this subpart.

(3) When using appendix CC1 to this subpart, determine the estimated annual operating cost for portable air conditioners, in dollars per year and rounded to the nearest whole number, by multiplying a representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary by the total AEC. The total AEC is the sum of AEC95, AEC83, AECoc, and AECia, as measured in accordance with section 5.3 of appendix CC1 to this subpart.

(ee) Integrated light-emitting diode lamp. (1) The input power of an integrated light-emitting diode lamp must be measured in accordance with section 3 of appendix BB of this subpart.

(2) The lumen output of an integrated light-emitting diode lamp must be measured in accordance with section 3 of appendix BB of this subpart.

(3) The lamp efficacy of an integrated light-emitting diode lamp must be calculated in accordance with section 3 of appendix BB of this subpart.

(4) The correlated color temperature of an integrated light-emitting diode lamp must be measured in accordance with section 3 of appendix BB of this subpart.

(5) The color rendering index of an integrated light-emitting diode lamp must be measured in accordance with section 3 of appendix BB of this subpart.

(6) The power factor of an integrated light-emitting diode lamp must be measured in accordance with section 3 of appendix BB of this subpart.

(7) The time to failure of an integrated light-emitting diode lamp must be measured in accordance with section 4 of appendix BB of this subpart.

(8) The standby mode power must be measured in accordance with section 5 of appendix BB of this subpart.

(ff) Coolers and combination cooler refrigeration products. (1) The estimated annual operating cost for models without an anti-sweat heater switch shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) The average per-cycle energy consumption for the standard cycle in kilowatt-hours per cycle, determined according to appendix A of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(2) The estimated annual operating cost for models with an anti-sweat heater switch shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) Half the sum of the average per-cycle energy consumption for the standard cycle and the average per-cycle energy consumption for a test cycle type with the anti-sweat heater switch in the position set at the factory just before shipping, each in kilowatt-hours per cycle, determined according to appendix A of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(3) The estimated annual operating cost for any other specified cycle type shall be the product of the following three factors, with the resulting product then being rounded to the nearest dollar per year:

(i) The representative average-use cycle of 365 cycles per year;

(ii) The average per-cycle energy consumption for the specified cycle type, determined according to appendix A of this subpart; and

(iii) The representative average unit cost of electricity in dollars per kilowatt-hour as provided by the Secretary.

(4) The energy factor, expressed in cubic feet per kilowatt-hour per cycle, shall be:

(i) For models without an anti-sweat heater switch, the quotient of:

(A) The adjusted total volume in cubic feet, determined according to appendix A of this subpart, divided by—

(B) The average per-cycle energy consumption for the standard cycle in kilowatt-hours per cycle, determined according to appendix A of this subpart, the resulting quotient then being rounded to the second decimal place; and

(ii) For models having an anti-sweat heater switch, the quotient of:

(A) The adjusted total volume in cubic feet, determined according to appendix A of this subpart, divided by—

(B) Half the sum of the average per-cycle energy consumption for the standard cycle and the average per-cycle energy consumption for a test cycle type with the anti-sweat heater switch in the position set at the factory just before shipping, each in kilowatt-hours per cycle, determined according to appendix A of this subpart, the resulting quotient then being rounded to the second decimal place.

(5) The annual energy use, expressed in kilowatt-hours per year and rounded to the nearest kilowatt-hour per year, shall be determined according to appendix A of this subpart.

(6) Other useful measures of energy consumption shall be those measures of energy consumption that the Secretary determines are likely to assist consumers in making purchasing decisions which are derived from the application of appendix A of this subpart.

(7) The following principles of interpretation shall be applied to the test procedure. The intent of the energy test procedure is to simulate operation in typical room conditions (72 °F (22.2 °C)) with door openings by testing at 90 °F (32.2 °C) ambient temperature without door openings. Except for operating characteristics that are affected by ambient temperature (for example, compressor percent run time), the unit, when tested under this test procedure, shall operate in a manner equivalent to the unit's operation while in typical room conditions.

(i) The energy used by the unit shall be calculated when a calculation is provided by the test procedure. Energy consuming components that operate in typical room conditions (including as a result of door openings, or a function of humidity), and that are not excluded by this test procedure, shall operate in an equivalent manner during energy testing under this test procedure, or be accounted for by all calculations as provided for in the test procedure. Examples:

(A) Energy saving features that are designed to operate when there are no door openings for long periods of time shall not be functional during the energy test.

(B) The defrost heater shall neither function nor turn off differently during the energy test than it would when in typical room conditions. Also, the product shall not recover differently during the defrost recovery period than it would in typical room conditions.

(C) Electric heaters that would normally operate at typical room conditions with door openings shall also operate during the energy test.

(D) Energy used during adaptive defrost shall continue to be measured and adjusted per the calculation provided for in this test procedure.

(ii) DOE recognizes that there may be situations that the test procedures do not completely address. In such cases, a manufacturer must obtain a waiver in accordance with the relevant provisions of this part if:

(A) A product contains energy consuming components that operate differently during the prescribed testing than they would during representative average consumer use; and

(B) Applying the prescribed test to that product would evaluate it in a manner that is unrepresentative of its true energy consumption (thereby providing materially inaccurate comparative data).

(8) For non-compressor models, “compressor” and “compressor cycles” as used in appendix A of this subpart shall be interpreted to mean “refrigeration system” and “refrigeration system cycles,” respectively.

(gg) General Service Lamps. (1) For general service incandescent lamps, use paragraph (r) of this section.

(2) For compact fluorescent lamps, use paragraph (y) of this section.

(3) For integrated LED lamps, use paragraph (ee) of this section.

(4) For other incandescent lamps, measure initial light output, input power, lamp efficacy, power factor, and standby mode power in accordance with appendix DD of this subpart.

(5) For other fluorescent lamps, measure initial light output, input power, lamp efficacy, power factor, and standby mode power in accordance with appendix DD of this subpart.

(6) For OLED and non-integrated LED lamps, measure initial light output, input power, lamp efficacy, power factor, and standby mode power in accordance with appendix DD of this subpart.

(hh) Air cleaners. (1) The pollen clean air delivery rate (CADR), smoke CADR, and dust CADR, expressed in cubic feet per minute (cfm), for conventional room air cleaners shall be measured in accordance with section 5 of appendix FF of this subpart.

(2) The PM2.5 CADR, expressed in cfm, for conventional room air cleaners, shall be measured in accordance with section 5 of appendix FF of this subpart.

(3) The active mode and standby mode power consumption, expressed in watts, shall be measured in accordance with sections 5 and 6, respectively, of appendix FF of this subpart.

(4) The annual energy consumption, expressed in kilowatt-hours per year, and the integrated energy factor, expressed in CADR per watts (CADR/W), for conventional room air cleaners, shall be measured in accordance with section 7 of appendix FF of this subpart.

(5) The estimated annual operating cost for conventional room air cleaners, expressed in dollars per year, shall be determined by multiplying the following two factors:

(i) The annual energy consumption as calculated in accordance with section 7 of appendix FF of this subpart, and

(ii) A representative average unit cost of electrical energy in dollars per kilowatt-hour as provided by the Secretary, the resulting product then being rounded off to the nearest dollar per year.

(ii) Portable electric spas. Measure the standby loss in watts and the fill volume in gallons of a portable electric spa in accordance with appendix GG to this subpart.

[42 FR 27898, June 1, 1977] Editorial Note:For Federal Register citations affecting § 430.23, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.

The testing for general service fluorescent lamps, general service incandescent lamps (with the exception of lifetime testing), general service lamps (with the exception of applicable lifetime testing), incandescent reflector lamps, compact fluorescent lamps, and fluorescent lamp ballasts, and integrated light-emitting diode lamps must be conducted by test laboratories accredited by an Accreditation Body that is a signatory member to the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement (MRA). A manufacturer's or importer's own laboratory, if accredited, may conduct the applicable testing.

[81 FR 72504, Oct. 20, 2016]

(a) General information. This section provides a means for seeking waivers of the test procedure requirements of this subpart for basic models that meet the requirements of paragraph (a)(1) of this section. In granting a waiver or interim waiver, DOE will not change the energy use or efficiency metric that the manufacturer must use to certify compliance with the applicable energy conservation standard and to make representations about the energy use or efficiency of the covered product. The granting of a waiver or interim waiver by DOE does not exempt such basic models from any other regulatory requirement contained in this part or the certification and compliance requirements of 10 CFR part 429 and specifies an alternative method for testing the basic models addressed in the waiver.

(1) Any interested person may submit a petition to waive for a particular basic model any requirements of § 430.23 or of any appendix to this subpart, upon the grounds that the basic model contains one or more design characteristics which either prevent testing of the basic model according to the prescribed test procedures or cause the prescribed test procedures to evaluate the basic model in a manner so unrepresentative of its true energy and/or water consumption characteristics as to provide materially inaccurate comparative data.

(2) Manufacturers of basic model(s) subject to a waiver or interim waiver are responsible for complying with the other requirements of this subpart and with the requirements of 10 CFR part 429 regardless of the person that originally submitted the petition for waiver and/or interim waiver. The filing of a petition for waiver and/or interim waiver shall not constitute grounds for noncompliance with any requirements of this subpart.

(3) All correspondence regarding waivers and interim waivers must be submitted to DOE either electronically to [email protected] (preferred method of transmittal) or by mail to U.S. Department of Energy, Building Technologies Program, Test Procedure Waiver, 1000 Independence Avenue SW., Mailstop EE-5B, Washington, DC 20585-0121.

(b) Petition content and publication. (1) Each petition for interim waiver and waiver must:

(i) Identify the particular basic model(s) for which a waiver is requested, each brand name under which the identified basic model(s) will be distributed in commerce, the design characteristic(s) constituting the grounds for the petition, and the specific requirements sought to be waived, and must discuss in detail the need for the requested waiver;

(ii) Identify manufacturers of all other basic models distributed in commerce in the United States and known to the petitioner to incorporate design characteristic(s) similar to those found in the basic model that is the subject of the petition;

(iii) Include any alternate test procedures known to the petitioner to evaluate the performance of the product type in a manner representative of the energy and/or water consumption characteristics of the basic model; and

(iv) Be signed by the petitioner or an authorized representative. In accordance with the provisions set forth in 10 CFR 1004.11, any request for confidential treatment of any information contained in a petition or in supporting documentation must be accompanied by a copy of the petition, application or supporting documentation from which the information claimed to be confidential has been deleted. DOE will publish in the Federal Register the petition and supporting documents from which confidential information, as determined by DOE, has been deleted in accordance with 10 CFR 1004.11 and will solicit comments, data and information with respect to the determination of the petition.

(2) In addition to the requirements in paragraph (b)(1) of this section, each petition for interim waiver must reference the related petition for waiver, demonstrate likely success of the petition for waiver, and address what economic hardship and/or competitive disadvantage is likely to result absent a favorable determination on the petition for interim waiver.

(c) Notification to other manufacturers. (1) Each petitioner for interim waiver must, upon publication of a grant of an interim waiver in the Federal Register, notify in writing all known manufacturers of domestically marketed basic models of the same product class (as specified in 10 CFR 430.32) and of other product classes known to the petitioner to use the technology or have the characteristic at issue in the waiver. The notice must include a statement that DOE has published the interim waiver and petition for waiver in the Federal Register and the date the petition for waiver was published. The notice must also include a statement that DOE will receive and consider timely written comments on the petition for waiver. Within five working days, each petitioner must file with DOE a statement certifying the names and addresses of each person to whom a notice of the petition for waiver has been sent.

(2) If a petitioner does not request an interim waiver and notification has not been provided pursuant to paragraph (c)(1) of this section, each petitioner, after filing a petition for waiver with DOE, and after the petition for waiver has been published in the Federal Register, must, within five working days of such publication, notify in writing all known manufacturers of domestically marketed units of the same product class (as listed in 10 CFR 430.32) and of other product classes known to the petitioner to use the technology or have the characteristic at issue in the waiver. The notice must include a statement that DOE has published the petition in the Federal Register and the date the petition for waiver was published. Within five working days of the publication of the petition in the Federal Register, each petitioner must file with DOE a statement certifying the names and addresses of each person to whom a notice of the petition for waiver has been sent.

(d) Public comment and rebuttal. (1) Any person submitting written comments to DOE with respect to an interim waiver must also send a copy of the comments to the petitioner by the deadline specified in the notice.

(2) Any person submitting written comments to DOE with respect to a petition for waiver must also send a copy of such comments to the petitioner.

(3) A petitioner may, within 10 working days of the close of the comment period specified in the Federal Register, submit a rebuttal statement to DOE. A petitioner may rebut more than one comment in a single rebuttal statement.

(e) Provisions specific to interim waivers. (1) DOE will post a petition for interim waiver on its website within 5 business days of receipt of a complete petition. DOE will make best efforts to review a petition for interim waiver within 90 business days of receipt of a complete petition.

(2) A petition for interim waiver that does not meet the content requirements of paragraph (b) of this section will be considered incomplete. DOE will notify the petitioner of an incomplete petition via email.

(3) DOE will grant an interim waiver from the test procedure requirements if it appears likely that the petition for waiver will be granted and/or if DOE determines that it would be desirable for public policy reasons to grant immediate relief pending a determination on the petition for waiver. Notice of DOE's determination on the petition for interim waiver will be published in the Federal Register.

(f) Provisions specific to waivers—(1) Disposition of application. The petitioner shall be notified in writing as soon as practicable of the disposition of each petition for waiver. DOE shall issue a decision on the petition as soon as is practicable following receipt and review of the Petition for Waiver and other applicable documents, including, but not limited to, comments and rebuttal statements.

(2) Criteria for granting. DOE will grant a waiver from the test procedure requirements if DOE determines either that the basic model(s) for which the waiver was requested contains a design characteristic that prevents testing of the basic model according to the prescribed test procedures, or that the prescribed test procedures evaluate the basic model in a manner so unrepresentative of its true energy or water consumption characteristics as to provide materially inaccurate comparative data. Waivers may be granted subject to conditions, which may include adherence to alternate test procedures specified by DOE. DOE will consult with the Federal Trade Commission prior to granting any waiver, and will promptly publish in the Federal Register notice of each waiver granted or denied, and any limiting conditions of each waiver granted.

(g) Extension to additional basic models. A petitioner may request that DOE extend the scope of a waiver or an interim waiver to include additional basic models employing the same technology as the basic model(s) set forth in the original petition. The petition for extension must identify the particular basic model(s) for which a waiver extension is requested, each brand name under which the identified basic model(s) will be distributed in commerce, and documentation supporting the claim that the additional basic models employ the same technology as the basic model(s) set forth in the original petition. DOE will publish any such extension in the Federal Register.

(h) Duration. (1) Within one year of issuance of an interim waiver, DOE will either:

(i) Publish in the Federal Register a determination on the petition for waiver; or

(ii) Publish in the Federal Register a new or amended test procedure that addresses the issues presented in the waiver.

(2) When DOE publishes a decision and order on a petition for waiver in the Federal Register pursuant to paragraph (f) of this section, the interim waiver will terminate upon the data specified in the decision and order, in accordance with paragraph (i) of this section.

(3) When DOE amends the test procedure to address the issues presented in a waiver, the waiver or interim waiver will automatically terminate on the date on which use of that test procedure is required to demonstrate compliance.

(4) When DOE publishes a decision and order in the Federal Register to modify a waiver pursuant to paragraph (k) of this section, the existing waiver will terminate 180 days after the publication date of the decision and order.

(i) Compliance certification and representations. (1) If the interim waiver test procedure methodology is different than the decision and order test procedure methodology, certification reports to DOE required under 10 CFR 429.12 and any representations must be based on either of the two methodologies until 180 days after the publication date of the decision and order. Thereafter, certification reports and any representations must be based on the decision and order test procedure methodology, unless otherwise specified by DOE. Once a manufacturer uses the decision and order test procedure methodology in a certification report or any representation, all subsequent certification reports and any representations must be made using the decision and order test procedure methodology while the waiver is valid.

(2) When DOE publishes a new or amended test procedure, certification reports to DOE required under 10 CFR 429.12 and any representations must be based on the testing methodology of an applicable waiver or interim waiver, or the new or amended test procedure until the date on which use of such test procedure is required to demonstrate compliance, unless otherwise specified by DOE in the test procedure final rule. Thereafter, certification reports and any representations must be based on the test procedure final rule methodology. Once a manufacturer uses the test procedure final rule methodology in a certification report or any representation, all subsequent certification reports and any representations must be made using the test procedure final rule methodology.

(3) If DOE publishes a decision and order modifying an existing waiver, certification reports to DOE required under 10 CFR 429.12 and any representations must be based on either of the two methodologies until 180 days after the publication date of the decision and order modifying the waiver. Thereafter, certification reports and any representations must be based on the modified test procedure methodology unless otherwise specified by DOE. Once a manufacturer uses the modified test procedure methodology in a certification report or any representation, all subsequent certification reports and any representations must be made using the modified test procedure methodology while the modified waiver is valid.

(j) Petition for waiver required of other manufactures. Any manufacturer of a basic model employing a technology or characteristic for which a waiver was granted for another basic model and that results in the need for a waiver (as specified by DOE in a published decision and order in the Federal Register) must petition for and be granted a waiver for that basic model. Manufacturers may also submit a request for interim waiver pursuant to the requirements of this section.

(k) Rescission or modification. (1) DOE may rescind or modify a waiver or interim waiver at any time upon DOE's determination that the factual basis underlying the petition for waiver or interim waiver is incorrect, upon a determination that the results from the alternate test procedure are unrepresentative of the basic model(s)' true energy consumption characteristics, or for other appropriate reason. Waivers and interim waivers are conditioned upon the validity of statements, representations, and documents provided by the requestor; any evidence that the original grant of a waiver or interim waiver was based upon inaccurate information will weigh against continuation of the waiver. DOE's decision will specify the basis for its determination and, in the case of a modification, will also specify the change to the authorized test procedure.

(2) A person may request that DOE rescind or modify a waiver or interim waiver issued to that person if the person discovers an error in the information provided to DOE as part of its petition, determines that the waiver is no longer needed, or for other appropriate reasons. In a request for rescission, the requestor must provide a statement explaining why it is requesting rescission. In a request for modification, the requestor must explain the need for modification to the authorized test procedure and detail the modifications needed and the corresponding impact on measured energy consumption.

(3) DOE will publish a proposed rescission or modification (DOE-initiated or at the request of the original requestor) in the Federal Register for public comment. A requestor may, within 10 working days of the close of the comment period specified in the proposed rescission or modification published in the Federal Register, submit a rebuttal statement to DOE. A requestor may rebut more than one comment in a single rebuttal statement.

(4) DOE will publish its decision in the Federal Register. DOE's determination will be based on relevant information contained in the record and any comments received.

(5) After the effective date of a rescission, any basic model(s) previously subject to a waiver must be tested and certified using the applicable DOE test procedure in 10 CFR part 430.

(l) Revision of regulation. As soon as practicable after the granting of any waiver, DOE will publish in the Federal Register a notice of proposed rulemaking to amend its regulations so as to eliminate any need for the continuation of such waiver. As soon thereafter as practicable, DOE will publish in the Federal Register a final rule.

(m) To exhaust administrative remedies, any person aggrieved by an action under this section must file an appeal with the DOE's Office of Hearings and Appeals as provided in 10 CFR part 1003, subpart C.

[79 FR 26599, May 9, 2014, as amended at 85 FR 79820, Dec. 11, 2020; 86 FR 70959, Dec. 14, 2021]

Note:

Prior to April 11, 2022, any representations of volume and energy use of refrigerators, refrigerator-freezers, and miscellaneous refrigeration products must be based on the results of testing pursuant to either this appendix or the procedures in appendix A as it appeared at 10 CFR part 430, subpart B, appendix A, in the 10 CFR parts 200 to 499 edition revised as of January 1, 2019. Any representations of volume and energy use must be in accordance with whichever version is selected. On or after April 11, 2022, any representations of volume and energy use must be based on the results of testing pursuant to this appendix.

For refrigerators and refrigerator-freezers, the rounding requirements specified in sections 4 and 5 of this appendix are not required for use until the compliance date of any amendment of energy conservation standards for these products published after October 12, 2021.

1. Referenced Materials

DOE incorporated by reference AHAM HRF-1-2019, Energy and Internal Volume of Consumer Refrigeration Products (“HRF-1-2019”), and AS/NZS 4474.1:2007, Performance of Household Electrical Appliances—Refrigerating Appliances; Part 1: Energy Consumption and Performance, Second Edition (“AS/NZS 4474.1:2007”), in their entirety in § 430.3; however, only enumerated provisions of these documents are applicable to this appendix. If there is any conflict between HRF-1-2019 and this appendix or between AS/NZS 4474.1:2007 and this appendix, follow the language of the test procedure in this appendix, disregarding the conflicting industry standard language.

(a) AHAM HRF-1-2019, (“HRF-1-2019”), Energy and Internal Volume of Consumer Refrigeration Products:

(i) Section 3—Definitions, as specified in section 3 of this appendix;

(ii) Section 4—Method for Determining the Refrigerated Volume of Consumer Refrigeration Products, as specified in section 4.1 of this appendix;

(iii) Section 5—Method for Determining the Energy Consumption of Consumer Refrigeration Products (excluding Table 5-1 and sections 5.5.6.5, 5.8.2.1.2, 5.8.2.1.3, 5.8.2.1.4, 5.8.2.1.5, and 5.8.2.1.6), as specified in section 5 of this appendix; and

(iv) Section 6—Method for Determining the Adjusted Volume of Consumer Refrigeration Products, as specified in section 4.2 of this appendix;

(b) AS/NZS 4474.1:2007, (“AS/NZS 4474.1:2007”), Performance of Household Electrical Appliances—Refrigerating Appliances; Part 1: Energy Consumption and Performance, Second Edition:

(i) Appendix M—Method of Interpolation When Two Controls are Adjusted, as specified in sections 5.2(b) and 5.5 of this appendix.

(ii) [Reserved]

2. Scope

This appendix provides the test procedure for measuring the annual energy use in kilowatt-hours per year (kWh/yr), the total refrigerated volume in cubic feet (ft 3), and the total adjusted volume in cubic feet (ft 3) of refrigerators, refrigerator-freezers, and miscellaneous refrigeration products.

3. Definitions

Section 3, Definitions, of HRF-1-2019 applies to this test procedure. In case of conflicting terms between HRF-1-2019 and DOE's definitions in this appendix or in § 430.2, DOE's definitions take priority.

Door-in-door means a set of doors or an outer door and inner drawer for which—

(a) Both doors (or both the door and the drawer) must be opened to provide access to the interior through a single opening;

(b) Gaskets for both doors (or both the door and the drawer) are exposed to external ambient conditions on the outside around the full perimeter of the respective openings; and

(c) The space between the two doors (or between the door and the drawer) achieves temperature levels consistent with the temperature requirements of the interior compartment to which the door-in-door provides access.

Through-the-door ice/water dispenser means a device incorporated within the cabinet, but outside the boundary of the refrigerated space, that delivers to the user on demand ice and may also deliver water from within the refrigerated space without opening an exterior door. This definition includes dispensers that are capable of dispensing ice and water or ice only.

Transparent door means an external fresh food compartment door which meets the following criteria:

(a) The area of the transparent portion of the door is at least 40 percent of the area of the door.

(b) The area of the door is at least 50 percent of the sum of the areas of all the external doors providing access to the fresh food compartments and cooler compartments.

(c) For the purposes of this evaluation, the area of a door is determined as the product of the maximum height and maximum width dimensions of the door, not considering potential extension of flaps used to provide a seal to adjacent doors.

4. Volume

Determine the refrigerated volume and adjusted volume for refrigerators, refrigerator-freezers, and miscellaneous refrigeration products in accordance with the following sections of HRF-1-2019, respectively:

4.1. Section 4, Method for Determining the Refrigerated Volume of Consumer Refrigeration Products; and

4.2. Section 6, Method for Determining the Adjusted Volume of Consumer Refrigeration Products.

5. Energy Consumption

Determine the annual energy use (“AEU”) in kilowatt-hours per year (kWh/yr), for refrigerators, refrigerator-freezers, and miscellaneous refrigeration products in accordance with section 5, Method for Determining the Energy Consumption of Consumer Refrigeration Products, of HRF-1-2019, except as follows.

5.1. Test Setup and Test Conditions

(a) In section 5.3.1 of HRF-1-2019, the top of the unit shall be determined by the refrigerated cabinet height, excluding any accessories or protruding components on the top of the unit.

(b) The ambient temperature and vertical ambient temperature gradient requirements specified in section 5.3.1 of HRF-1-2019 shall be maintained during both the stabilization period and the test period.

(c) The power supply requirements as specified in section 5.5.1 of HRF-1-2019 shall be maintained based on measurement intervals not to exceed one minute.

(d) The ice storage compartment temperature requirement as specified in section 5.5.6.5 in HRF-1-2019 is not required.

(e) For cases in which setup is not clearly defined by this test procedure, manufacturers must submit a petition for a waiver (See section 6 of this appendix).

(f) If the interior arrangements of the unit under test do not conform with those shown in Figures 5-1 or 5-2 of HRF-1-2019, as appropriate, the unit must be tested by relocating the temperature sensors from the locations specified in the figures to avoid interference with hardware or components within the unit, in which case the specific locations used for the temperature sensors shall be noted in the test data records maintained by the manufacturer in accordance with 10 CFR 429.71, and the certification report shall indicate that non-standard sensor locations were used. If any temperature sensor is relocated by any amount from the location prescribed in Figure 5-1 or 5-2 of HRF-1-2019 in order to maintain a minimum 1-inch air space from adjustable shelves or other components that could be relocated by the consumer, except in cases in which the Figures prescribe a temperature sensor location within 1 inch of a shelf or similar feature (e.g., sensor T3 in Figure 5-1), this constitutes a relocation of temperature sensors that must be recorded in the test data and reported in the certification report as described in this paragraph.

5.2. Test Conduct

(a) Standard Approach

(i) For the purposes of comparing compartment temperatures with standardized temperatures, as described in section 5.6 of HRF-1-2019, the freezer compartment temperature shall be as specified in section 5.8.1.2.5 of HRF-1-2019, the fresh food compartment temperature shall be as specified in section 5.8.1.2.4 of HRF-1-2019, and the cooler compartment temperature shall be as specified in section 5.8.1.2.6 of HRF-1-2019.

(ii) In place of Table 5-1 in HRF-1-2019, refer to Table 1 of this section.

(b) Three-Point Interpolation Method (Optional Test for Models with Two Compartments and User-Operable Controls). As specified in section 5.6.3(6) of HRF-1-2019, and as an optional alternative to section 5.2(a) of this appendix, perform three tests such that the set of tests meets the “minimum requirements for interpolation” of AS/NZS 4474.1:2007 appendix M, section M3, paragraphs (a) through (c) and as illustrated in Figure M1. The target temperatures txA and txB defined in section M4(a)(i) of AS/NZ 4474.1:2007 shall be the standardized temperatures defined in section 5.6 of HRF-1-2019.

5.3. Test Cycle Energy Calculations

Section 5.8.2, Energy Consumption, of HRF-1-2019 applies to this test procedure, except as follows:

(a) In place of section 5.8.2.1.2 of HRF-1-2019, use the calculations provided in this section. For units with long-time automatic defrost control using the two-part test period, the test cycle energy shall be calculated as:

Where: ET = test cycle energy expended in kilowatt-hours per day; 1440 = conversion factor to adjust to a 24-hour average use cycle in minutes per day; K = dimensionless correction factor of 1.0 for refrigerators and refrigerator-freezers and 0.55 for miscellaneous refrigeration products. EP1 = energy expended in kilowatt-hours during the first part of the test; EP2 = energy expended in kilowatt-hours during the second part of the test; T1 and T2 = length of time in minutes of the first and second test parts, respectively; CT = defrost timer run time or compressor run time between defrosts in hours required to go through a complete cycle, rounded to the nearest tenth of an hour; 12 = factor to adjust for a 50-percent run time of the compressor in hours per day.

(b) In place of sections 5.8.2.1.3 and 5.8.2.1.4 of HRF-1-2019, use the calculations provided in this section. For units with variable defrost control, the test cycle energy shall be calculated as set forth in section 5.3(a) of this appendix with the following addition:

CT shall be calculated equivalent to:

Where: CTL = the least or shortest compressor run time between defrosts used in the variable defrost control algorithm (greater than or equal to 6 but less than or equal to 12 hours), or the shortest compressor run time between defrosts observed for the test (if it is shorter than the shortest run time used in the control algorithm and is greater than 6 hours), or 6 hours (if the shortest observed run time is less than 6 hours), in hours rounded to the nearest tenth of an hour; CTM = the maximum compressor run time between defrosts in hours rounded to the nearest tenth of an hour (greater than CTL but not more than 96 hours); For variable defrost models with no values of CTL and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively. F = ratio of per day energy consumption in excess of the least energy and the maximum difference in per-day energy consumption and is equal to 0.20.

(c) In place of section 5.8.2.1.5 of HRF-1-2019, use the calculations provided in this section. For multiple-compressor products with automatic defrost, the two-part test method in section 5.7.2.1 of HRF-1-2019 shall be used, and the test cycle energy shall be calculated as:

Where: ET, 1440, 12, and K are defined in section 5.3(a) of this appendix; EP1, and T1 are defined in section 5.3(a) of this appendix; i = a subscript variable that can equal 1, 2, or more that identifies each individual compressor system that has automatic defrost; D = the total number of compressor systems with automatic defrost; EP2i = energy expended in kilowatt-hours during the second part of the test for compressor system i; T2i = length of time in minutes of the second part of the test for compressor system i; CTi = compressor run time between defrosts of compressor system i, rounded to the nearest tenth of an hour, for long-time automatic defrost control equal to a fixed time in hours, and for variable defrost control equal to: Where: CTL,i = for compressor system i, the shortest cumulative compressor-on time between defrost heater-on events used in the variable defrost control algorithm (CTL for the compressor system with the longest compressor run time between defrosts must be greater than or equal to 6 but less than or equal to 12 hours), in hours rounded to the nearest tenth of an hour; CTM,i = for compressor system i, the maximum compressor-on time between defrost heater-on events used in the variable defrost control algorithm (greater than CTL,i but not more than 96 hours), in hours rounded to the nearest tenth of an hour; For defrost cycle types with no values of CTL and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively. F = ratio of per day energy consumption in excess of the least energy and the maximum difference in per-day energy consumption and is equal to 0.20.

(d) In place of section 5.8.2.1.6 of HRF-1-2019, use the calculations provided in this section. For units with long-time automatic defrost control and variable defrost control with multiple defrost cycle types, the two-part test method in section 5.7.2.1 of HRF-1-2019 shall be used, and the test cycle energy shall be calculated as:

Where: ET, 1440, 12, and K are defined in section 5.3(a) of this appendix; EP1, and T1 are defined in section 5.3(a) of this appendix; i = a subscript variable that can equal 1, 2, or more that identifies the distinct defrost cycle types applicable for the product; D = the total number of defrost cycle types; EP2i = energy expended in kilowatt-hours during the second part of the test for defrost cycle type i; T2i = length of time in minutes of the second part of the test for defrost cycle type i; CTi = defrost timer run time or compressor run time between instances of defrost cycle type i, rounded to the nearest tenth of an hour; 12 = factor to adjust for a 50-percent run time of the compressor in hours per day.

(i) For long-time automatic defrost control, CTi shall be equal to a fixed time in hours rounded to the nearest tenth of an hour. For cases in which there are more than one fixed CT value for a given defrost cycle type, an average fixed CT value shall be selected for this cycle type.

(ii) For variable defrost control, CTi shall be calculated equivalent to:

Where: CTL,i = the least or shortest compressor run time between instances of the defrost cycle type i in hours rounded to the nearest tenth of an hour (CTL for the defrost cycle type with the longest compressor run time between defrosts must be greater than or equal to 6 but less than or equal to 12 hours); CTM,i = the maximum compressor run time between instances of defrost cycle type i in hours rounded to the nearest tenth of an hour (greater than CTL,i but not more than 96 hours); For cases in which there are more than one CTM and/or CTL value for a given defrost cycle type, an average of the CTM and CTL values shall be selected for this defrost cycle type. For defrost cycle types with no values of CTL and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively. F = ratio of per day energy consumption in excess of the least energy and the maximum difference in per-day energy consumption and is equal to 0.20. 5.4. Icemaker Energy Use

(a) For refrigerators and refrigerator-freezers: To demonstrate compliance with the energy conservation standards at § 430.32(a) applicable to products manufactured on or after September 15, 2014, but before the compliance date of any amended standards published after January 1, 2022, IET, expressed in kilowatt-hours per cycle, equals 0.23 for a product with one or more automatic icemakers and otherwise equals 0 (zero). To demonstrate compliance with any amended standards published after January 1, 2022, IET, expressed in kilowatt-hours per cycle, is as defined in section 5.9.2.1 of HRF-1-2019.

(b) For miscellaneous refrigeration products: To demonstrate compliance with the energy conservation standards at § 430.32(aa) applicable to products manufactured on or after October 28, 2019, IET, expressed in kilowatt-hours per cycle, equals 0.23 for a product with one or more automatic icemakers and otherwise equals 0 (zero).

5.5. Triangulation Method

If the three-point interpolation method of section 5.2(b) of this appendix is used for setting temperature controls, the average per-cycle energy consumption shall be defined as follows:

E = EX + IET Where: E is defined in section 5.9.1.1 of HRF-1-2019; IET is defined in section 5.4 of this appendix; and EX is defined and calculated as described in appendix M, section M4(a) of AS/NZS 4474.1:2007. The target temperatures txA and txB defined in section M4(a)(i) of AS/NZS 4474.1:2007 shall be the standardized temperatures defined in section 5.6 of HRF-1-2019. 6. Test Procedure Waivers

To the extent that the procedures contained in this appendix do not provide a means for determining the energy consumption of a basic model, a manufacturer must obtain a waiver under § 430.27 to establish an acceptable test procedure for each such basic model. Such instances could, for example, include situations where the test setup for a particular basic model is not clearly defined by the provisions of this appendix. For details regarding the criteria and procedures for obtaining a waiver, please refer to § 430.27.

[86 FR 56821, Oct. 12, 2021, as amended at 89 FR 3112, Jan. 17, 2024]

Note:

Prior to April 11, 2022, any representations of volume and energy use of freezers must be based on the results of testing pursuant to either this appendix or the procedures in appendix B as it appeared at 10 CFR part 430, subpart B, appendix B, in the 10 CFR parts 200 to 499 edition revised as of January 1, 2019. Any representations of volume and energy use must be in accordance with whichever version is selected. On or after April 11, 2022, any representations of volume and energy use must be based on the results of testing pursuant to this appendix.

For freezers, the rounding requirements specified in sections 4 and 5 of this appendix are not required for use until the compliance date of any amendment of energy conservation standards for these products published after October 12, 2021.

1. Referenced Materials

DOE incorporated by reference HRF-1-2019, Energy and Internal Volume of Consumer Refrigeration Products (“HRF-1-2019”) in its entirety in § 430.3; however, only enumerated provisions of this document are applicable to this appendix. If there is any conflict between HRF-1-2019 and this appendix, follow the language of the test procedure in this appendix, disregarding the conflicting industry standard language.

(a) AHAM HRF-1-2019, (“HRF-1-2019”), Energy and Internal Volume of Consumer Refrigeration Products:

(i) Section 3—Definitions, as specified in section 3 of this appendix;

(ii) Section 4—Method for Determining the Refrigerated Volume of Consumer Refrigeration Products, as specified in section 4.1 of this appendix;

(iii) Section 5—Method for Determining the Energy Consumption of Consumer Refrigeration Products (excluding Table 5-1 and sections 5.5.6.5, 5.8.2.1.2, 5.8.2.1.3, 5.8.2.1.4, 5.8.2.1.5, and 5.8.2.1.6), as specified in section 5 of this appendix; and

(iv) Section 6—Method for Determining the Adjusted Volume of Consumer Refrigeration Products, as specified in section 4.2 of this appendix.

(b) Reserved.

If there is any conflict between HRF-1—2019 and this appendix, follow the language of the test procedure in this appendix, disregarding the conflicting industry standard language.

2. Scope

This appendix provides the test procedure for measuring the annual energy use in kilowatt-hours per year (kWh/yr), the total refrigerated volume in cubic feet (ft 3), and the total adjusted volume in cubic feet (ft 3) of freezers.

3. Definitions

Section 3, Definitions, of HRF-1-2019 applies to this test procedure. In case of conflicting terms between HRF-1-2019 and DOE's definitions in this appendix or in § 430.2, DOE's definitions take priority.

Through-the-door ice/water dispenser means a device incorporated within the cabinet, but outside the boundary of the refrigerated space, that delivers to the user on demand ice and may also deliver water from within the refrigerated space without opening an exterior door. This definition includes dispensers that are capable of dispensing ice and water or ice only.

4. Volume

Determine the refrigerated volume and adjusted volume for freezers in accordance with the following sections of HRF-1-2019, respectively:

4.1. Section 4, Method for Determining the Refrigerated Volume of Consumer Refrigeration Products; and

4.2. Section 6, Method for Determining the Adjusted Volume of Consumer Refrigeration Products.

5. Energy Consumption

Determine the annual energy use (“AEU”) in kilowatt-hours per year (kWh/yr), for freezers in accordance with section 5, Method for Determining the Energy Consumption of Consumer Refrigeration Products, of HRF-1-2019, except as follows.

5.1. Test Setup and Test Conditions

(a) In section 5.3.1 of HRF-1-2019, the top of the unit shall be determined by the refrigerated cabinet height, excluding any accessories or protruding components on the top of the unit.

(b) The ambient temperature and vertical ambient temperature gradient requirements specified in section 5.3.1 of HRF-1-2019 shall be maintained during both the stabilization period and the test period.

(c) The power supply requirements as specified in section 5.5.1 of HRF-1-2019 shall be maintained based on measurement intervals not to exceed one minute.

(d) The ice storage compartment temperature requirement as specified in section 5.5.6.5 in HRF-1-2019 is not required.

(e) For cases in which setup is not clearly defined by this test procedure, manufacturers must submit a petition for a waiver (See section 6 of this appendix).

(f) If the interior arrangements of the unit under test do not conform with those shown in Figure 5-2 of HRF-1-2019, as appropriate, the unit must be tested by relocating the temperature sensors from the locations specified in the figures to avoid interference with hardware or components within the unit, in which case the specific locations used for the temperature sensors shall be noted in the test data records maintained by the manufacturer in accordance with 10 CFR 429.71, and the certification report shall indicate that non-standard sensor locations were used. If any temperature sensor is relocated by any amount from the location prescribed in Figure 5-2 of HRF-1- 2019 in order to maintain a minimum 1-inch air space from adjustable shelves or other components that could be relocated by the consumer, except in cases in which the Figure prescribes a temperature sensor location within 1 inch of a shelf or similar feature, this constitutes a relocation of temperature sensors that must be recorded in the test data and reported in the certification report as described in this paragraph.

5.2. Test Conduct

(a) For the purposes of comparing compartment temperatures with standardized temperatures, as described in section 5.6 of HRF-1-2019, the freezer compartment temperature shall be as specified in section 5.8.1.2.5 of HRF-1-2019.

(b) In place of Table 5-1 in HRF-1-2019, refer to Table 1 of this section.

5.3. Test Cycle Energy Calculations

Section 5.8.2, Energy Consumption, of HRF-1-2019 applies to this test procedure, except as follows:

(a) In place of section 5.8.2.1.2 of HRF-1-2019, use the calculations provided in this section. For units with long-time automatic defrost control using the two-part test period, the test cycle energy shall be calculated as:

Where: ET = test cycle energy expended in kilowatt-hours per day; 1440 = conversion factor to adjust to a 24-hour average use cycle in minutes per day; K = dimensionless correction factor of 0.7 for chest freezers and 0.85 for upright freezers. EP1 = energy expended in kilowatt-hours during the first part of the test; EP2 = energy expended in kilowatt-hours during the second part of the test; T1 and T2 = length of time in minutes of the first and second test parts, respectively; CT = defrost timer run time or compressor run time between defrosts in hours required to go through a complete cycle, rounded to the nearest tenth of an hour; 12 = factor to adjust for a 50-percent run time of the compressor in hours per day.

(b) In place of sections 5.8.2.1.3 and 5.8.2.1.4 of HRF-1-2019, use the calculations provided in this section. For units with variable defrost control, the test cycle energy shall be calculated as set forth in section 5.3(a) of this appendix with the following addition:

CT shall be calculated equivalent to:

Where: CTL = the least or shortest compressor run time between defrosts used in the variable defrost control algorithm (greater than or equal to 6 but less than or equal to 12 hours), or the shortest compressor run time between defrosts observed for the test (if it is shorter than the shortest run time used in the control algorithm and is greater than 6 hours), or 6 hours (if the shortest observed run time is less than 6 hours), in hours rounded to the nearest tenth of an hour; CTM = the maximum compressor run time between defrosts in hours rounded to the nearest tenth of an hour (greater than CTL but not more than 96 hours); For variable defrost models with no values of CTL and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively. F = ratio of per day energy consumption in excess of the least energy and the maximum difference in per-day energy consumption and is equal to 0.20. 6. Test Procedure Waivers

To the extent that the procedures contained in this appendix do not provide a means for determining the energy consumption of a basic model, a manufacturer must obtain a waiver under § 430.27 to establish an acceptable test procedure for each such basic model. Such instances could, for example, include situations where the test setup for a particular basic model is not clearly defined by the provisions of this appendix. For details regarding the criteria and procedures for obtaining a waiver, please refer to § 430.27.

5.4. Icemaker Energy Use

For freezers: To demonstrate compliance with the energy conservation standards at § 430.32(a) applicable to products manufactured on or after September 15, 2014, but before the compliance date of any amended standards published after January 1, 2022, IET, expressed in kilowatt-hours per cycle, equals 0.23 for a product with one or more automatic icemakers and otherwise equals 0 (zero). To demonstrate compliance with any amended standards published after January 1, 2022, IET, expressed in kilowatt-hours per cycle, is as defined in section 5.9.2.1 of HRF-1-2019.

[86 FR 56824, Oct. 12, 2021, as amended at 89 FR 3113, Jan. 17, 2024]

Note:

Before January 23, 2024, manufacturers must use the results of testing under this appendix as codified on August 28, 2023, or February 17, 2023, to determine compliance with the relevant standard from § 430.32(f)(1) as it appeared in the January 1, 2023, edition of 10 CFR parts 200-499. Beginning January 23, 2024, manufacturers must use the results of testing under this appendix to determine compliance with the relevant standard from § 430.32(f)(1) as it appeared in the January 1, 2023, edition of 10 CFR parts 200-499. Manufacturers must use the results of testing under appendix C2 to this subpart to determine compliance with any amended standards for dishwashers provided in 10 CFR 430.32(f)(1) that are published after January 1, 2023. Any representations related to energy or water consumption of dishwashers must be made in accordance with the appropriate appendix that applies (i.e., appendix C1 or appendix C2) when determining compliance with the relevant standard. Manufacturers may also use appendix C2 to certify compliance with any amended standards prior to the applicable compliance date for those standards. The regulation at 10 CFR 429.19(b)(3) provides instructions regarding the combination of detergent and detergent dosing, specified in section 2.5 of this appendix, used for certification.

0. Incorporation by Reference

In § 430.3, DOE incorporated by reference the entire standard for AHAM DW-1-2020 and AHAM DW-2-2020; however, only enumerated provision of AHAM DW-1-2020, AHAM DW-2-2020, and IEC 62301 are applicable as follows:

0.1 AHAM DW-1-2020

(a) Sections 1.1 through 1.30 as referenced in section 1 of this appendix;

(b) Section 2.1 as referenced in sections 2 and 2.1 of this appendix;

(c) Sections 2.2 through 2.3.3, sections 2.5 through 2.7, sections 2.7.2 through 2.8, and section 2.11, as referenced in section 2 of this appendix;

(d) Section 2.4 as referenced in sections 2 and 2.2 of this appendix;

(e) Section 2.7.1 as referenced in sections 2 and 2.3 of this appendix;

(f) Section 2.9 as referenced in sections 2 and 2.4 of this appendix;

(g) Section 2.10 as referenced in sections 2 and 2.5 of this appendix;

(h) Sections 3.1 through 3.2 and sections 3.5 through 3.7 as referenced in section 3 of this appendix;

(i) Section 3.3 as referenced in sections 3 and 3.1 of this appendix;

(j) Section 3.4 as referenced in sections 3 and 3.2 of this appendix;

(k) Sections 4.1 through 4.1.2 and sections 4.1.4 through 4.2 as referenced in section 4 of this appendix;

(l) Section 4.1.4 as referenced in sections 4 and 4.1 of this appendix; and

(m) Section 5 as referenced in section 5 of this appendix.

0.2 AHAM DW-2-2020: Household Electric Dishwashers

(a) Section 3.4 as referenced in sections 2 and 2.3 of this appendix, and through reference to sections 1.5 and 1.22 of AHAM DW-1-2020 in section 1 of this appendix.

(b) Section 3.5 through reference to sections 1.5 and 1.22 of AHAM DW-1-2020 in section 1 of this appendix.

(c) Section 4.1 as referenced in section 2 of this appendix.

(d) Sections 5.3 through 5.8 as referenced in section 2 of this appendix, and through reference to sections 1.18, 1.19, and 1.20 of AHAM DW-1-2020 in section 1 of this appendix.

0.3 IEC 62301

(a) Sections 4.2, 4.3.2, and 5.2 as referenced in section 2 of this appendix; and

(b) Sections 5.1, note 1, and 5.3.2 as referenced in section 4 of this appendix.

1. Definitions

The definitions in sections 1.1 through 1.30 of AHAM DW-1-2020 apply to this test procedure, including the applicable provisions of AHAM DW-2-2020 as referenced in sections 1.5, 1.18, 1.19. 1.20, and 1.22 of AHAM DW-1-2020.

2. Testing Conditions

The testing conditions in sections 2.1 through 2.11 of AHAM DW-1-2020 apply to this test procedure, including the following provisions of:

(a) Sections 5.2, 4.3.2, and 4.2 of IEC 62301 as referenced in sections 2.1, 2.2.4, and 2.5.2 of AHAM DW-1-2020, respectively, and

(b) Sections 5.3 through 5.8 of AHAM DW-2-2020 as referenced in sections 2.6.3.1, 2.6.3.2, and 2.6.3.3 of AHAM DW-1-2020; section 3.4 of AHAM DW-2-2020, excluding the accompanying Note, as referenced in section 2.7.1 of AHAM DW-1-2020; section 5.4 of AHAM DW-2-2020 as referenced in section 2.7.4 of AHAM DW-1-2020; section 5.5 of AHAM DW-2-2020 as referenced in section 2.7.5 of AHAM DW-1-2020, and section 4.1 of AHAM DW-2-2020 as referenced in section 2.10.1 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

2.1 Installation Requirements.

The installation requirements described in section 2.1 of AHAM DW-1-2020 are applicable to all dishwashers, with the following additions:

2.1.1 In-Sink Dishwashers.

For in-sink dishwashers, the requirements pertaining to the rectangular enclosure for under-counter or under-sink dishwashers are not applicable. For such dishwashers, the rectangular enclosure must consist of a front, a back, two sides, and a bottom. The front, back, and sides of the enclosure must be brought into the closest contact with the appliance that the configuration of the dishwasher will allow. The height of the enclosure shall be as specified in the manufacturer's instructions for installation height. If no instructions are provided, the enclosure height shall be 36 inches. The dishwasher must be installed from the top and mounted to the edges of the enclosure.

2.1.2 Dishwashers without a Direct Water Line.

Manually fill the built-in water reservoir to the full capacity reported by the manufacturer, using water at a temperature in accordance with section 2.3 of AHAM DW-1-2020.

2.2 Water pressure.

The water pressure requirements described in section 2.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line.

2.3 Test load items.

The test load items described in section 2.7.1 of AHAM DW-1-2020 apply to this test procedure, including the applicable provisions of section 3.4 of AHAM DW-2-2020, as referenced in section 2.7.1 of AHAM DW-1-2020. The following test load items may be used in the alternative.

2.4 Preconditioning requirements.

The preconditioning requirements described in section 2.9 of AHAM DW-1-2020 are applicable to all dishwashers. For dishwashers that do not have a direct water line, measurement of the prewash fill water volume, Vpw, if any, and measurement of the main wash fill water volume, Vmw, are not taken.

2.5 Detergent.

2.5.1 Detergent Formulation. Either Cascade with the Grease Fighting Power of Dawn or Cascade Complete Powder may be used.

2.5.2 Detergent Dosage.

2.5.2.1 Dosage for any dishwasher other than water re-use system dishwashers.

If Cascade with the Grease Fighting Power of Dawn detergent is used, the detergent dosing specified in section 2.5.2.1.1 of this appendix must be used.

If Cascade Complete Powder detergent is used, consult the introductory note to this appendix regarding use of the detergent dosing specified in either section 2.5.2.1.1 or section 2.5.2.1.2 of this appendix.

2.5.2.1.1 Dosage based on fill water volumes. Determine detergent dosage as follows:

Prewash Detergent Dosing. If the cycle setting for the test cycle includes prewash, determine the quantity of dry prewash detergent, Dpw, in grams (g) that results in 0.25 percent concentration by mass in the prewash fill water as:

Dpw = Vpw × ρ × k × 0.25/100 where, Vpw = the prewash fill volume of water in gallons, ρ = water density = 8.343 pounds (lb)/gallon for dishwashers to be tested at a nominal inlet water temperature of 50 °F (10 °C), 8.250 lb/gallon for dishwashers to be tested at a nominal inlet water temperature of 120 °F (49 °C), and 8.205 lb/gallon for dishwashers to be tested at a nominal inlet water temperature of 140 °F (60 °C), and k = conversion factor from lb to g = 453.6 g/lb.

Main Wash Detergent Dosing. Determine the quantity of dry main wash detergent, Dmw, in grams (g) that results in 0.25 percent concentration by mass in the main wash fill water as:

Dmw = Vmw × ρ × k × 0.25/100 where, Vmw = the main wash fill volume of water in gallons, and ρ and k are as defined above.

For dishwashers that do not have a direct water line, Vmw is equal to the manufacturer reported water capacity used in the main wash stage of the test cycle.

2.5.2.1.2 Dosage based on number of place settings. Determine detergent dosage as specified in sections 2.10 and 2.10.1 of AHAM DW-1-2020.

2.5.2.2 Dosage for water re-use system dishwashers. Determine detergent dosage as specified in section 2.10.2 of AHAM DW-1-2020.

2.5.3 Detergent Placement.

Prewash and main wash detergent must be placed as specified in sections 2.10 and 2.10.1 of AHAM DW-1-2020. For any dishwasher that does not have a main wash detergent compartment and the manufacturer does not recommend a location to place the main wash detergent, place the main wash detergent directly into the dishwasher chamber.

2.6 Connected functionality.

For dishwashers that can communicate through a network (e.g., Bluetooth® or internet connection), disable all network functions that can be disabled by means provided in the manufacturer's user manual, for the duration of testing. If network functions cannot be disabled by means provided in the manufacturer's user manual, conduct the standby power test with network function in the “as-shipped” condition.

3. Instrumentation

For this test procedure, the test instruments are to be calibrated annually according to the specifications in sections 3.1 through 3.7 of AHAM DW-1-2020, including the applicable provisions of IEC 62301 as referenced in section 3.6 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

3.1 Water meter.

The water meter requirements described in section 3.3 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water meter conditions do not apply and water is added manually pursuant to section 2.1.1 of this appendix.

3.2 Water pressure gauge.

The water pressure gauge requirements described in section 3.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water pressure gauge conditions do not apply and water is added manually pursuant to section 2.1.1 of this appendix.

4. Test Cycle and Measurements

The test cycle and measurement specifications in sections 4.1 through 4.2 of AHAM DW-1-2020 apply to this test procedure, including section 5.1, note 1, and section 5.3.2 of IEC 62301 as referenced in section 4.2 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

4.1 Water consumption.

The water consumption requirements described in section 4.1.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water consumption measurement requirements do not apply and water consumption, V, is the value reported by the manufacturer.

5. Calculation of Derived Results From Test Measurements

The calculations in section 5.1 through 5.7 of AHAM DW-1-2020 apply to this test procedure. The following additional requirements are also applicable:

(a) In sections 5.1.3, 5.1.4, 5.1.5, 5.4.3, 5.4.4, 5.4.5, and 5.7 of AHAM DW-1-2020, use N = 215 cycles/year in place of N = 184 cycles/year.

(b) In section 5.7 of AHAM DW-1-2020, use SLP = 8,465 for dishwashers that are not capable of operating in fan-only mode.

(c) For dishwashers that do not have a direct water line, water consumption is equal to the volume of water use in the test cycle, as specified by the manufacturer.

(d) In sections 5.6.1.3, 5.6.1.4, 5.6.2.3, and 5.6.2.4 of AHAM DW-1-2020, use (C/e) in place of K.

[88 FR 3277, Jan. 18, 2023, as amended at 88 FR 48357, July 27, 2023]

Note:

Manufacturers must use the results of testing under this appendix C2 to determine compliance with any standards for dishwashers provided in § 430.32(f)(1) that are published after January 1, 2023. Representations related to energy or water consumption of dishwashers must be made in accordance with the appropriate appendix that applies (i.e., appendix C1 or appendix C2) when determining compliance with the relevant standard. Manufacturers may also use appendix C2 to certify compliance with any amended standards prior to the applicable compliance date for those standards.

0. Incorporation by Reference

In § 430.3, DOE incorporated by reference the entire standard for AHAM DW-1-2020 and AHAM DW-2-2020; however, only enumerated provision of AHAM DW-1-2020, AHAM DW-2-2020, and IEC 62301 are applicable as follows:

0.1 AHAM DW-1-2020

(a) Sections 1.1 through 1.30 as referenced in section 1 of this appendix;

(b) Section 2.1 as referenced in sections 2 and 2.1 of this appendix;

(c) Sections 2.2 through 2.3.3, sections 2.5 and 2.7, sections 2.7.2 through 2.8, and section 2.11, as referenced in section 2 of this appendix;

(d) Section 2.4 as referenced in sections 2 and 2.2 of this appendix;

(e) Section 2.6.3 as referenced in sections 2 and 2.3 of this appendix;

(f) Section 2.7.1 as referenced in sections 2 and 2.4 of this appendix;

(g) Section 2.9 as referenced in sections 2 and 2.5 of this appendix;

(h) Section 2.10 as referenced in sections 2 and 2.6 of this appendix;

(i) Sections 3.1 through 3.2 and sections 3.5 through 3.7 as referenced in section 3 of this appendix;

(j) Section 3.3 as referenced in sections 3 and 3.1 of this appendix;

(k) Section 3.4 as referenced in sections 3 and 3.2 of this appendix;

(l) Section 4.1 as referenced in sections 4 and 4.1 of this appendix;

(m) Section 4.1.4 as referenced in sections 4 and 4.1.2 of this appendix; and

(n) Section 5 as referenced in section 5 of this appendix.

0.2 AHAM DW-2-2020

(a) Section 3.4 as referenced in sections 2 and 2.4 of this appendix, and through reference to sections 1.5 and 1.22 of AHAM DW-1-2020 in section 1 of this appendix.

(b) Section 3.5 through reference to sections 1.5 and 1.22 of AHAM DW-1-2020 in section 1 of this appendix.

(c) Section 4.1 as referenced in section 2 of this appendix.

(d) Sections 5.3 through 5.8 as referenced in section 2 of this appendix, and through reference to sections 1.18, 1.19 and 1.20 of AHAM DW-1-2020 in section 1 of this appendix.

(e) Section 5.10 as referenced in sections 2 and 2.8 of this appendix;

(f) Sections 5.10.1.1 as referenced in sections 4 and 4.2 of this appendix; and

(g) Section 5.12.3.1 as referenced in sections 5 and 5.1 of this appendix.

0.3 IEC 62301

(a) Sections 4.2, 4.3.2, and 5.2 as referenced in section 2 of this appendix; and

(b) Sections 5.1, note 1, and 5.3.2 as referenced in section 4 of this appendix.

1. Definitions

The definitions in sections 1.1 through 1.30 of AHAM DW-1-2020 apply to this test procedure, including the applicable provisions of AHAM DW-2-2020 as referenced in sections 1.5, 1.18, 1.19, 1.20, and 1.22 of AHAM DW-1-2020.

2. Testing Conditions

The testing conditions in Section 2.1 through 2.11 of AHAM DW-1-2020, except sections 2.6.1 and 2.6.2, and the testing conditions in section 5.10 of AHAM DW-2-2020 apply to this test procedure, including the following provisions of:

(a) Sections 5.2, 4.3.2, and 4.2 of IEC 62301 as referenced in sections 2.1, 2.2.4, and 2.5.2 of AHAM DW-1-2020, respectively, and

(b) Sections 5.3 through 5.8 of AHAM DW-2-2020 as referenced in sections 2.6.3.1, 2.6.3.2, and 2.6.3.3 of AHAM DW-1-2020; section 3.4 of AHAM DW-2-2020, excluding the accompanying Note, as referenced in section 2.7.1 of AHAM DW-1-2020; section 5.4 of AHAM DW-2-2020 as referenced in section 2.7.4 of AHAM DW-1-2020; section 5.5 of AHAM DW-2-2020 as referenced in section 2.7.5 of AHAM DW-1-2020, and section 4.1 of AHAM DW-2-2020 as referenced in section 2.10.1 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

2.1 Installation Requirements.

The installation requirements described in section 2.1 of AHAM DW-1-2020 are applicable to all dishwashers, with the following additions:

2.1.1 In-Sink Dishwashers.

For in-sink dishwashers, the requirements pertaining to the rectangular enclosure for under-counter or under-sink dishwashers are not applicable. For such dishwashers, the rectangular enclosure must consist of a front, a back, two sides, and a bottom. The front, back, and sides of the enclosure must be brought into the closest contact with the appliance that the configuration of the dishwasher will allow. The height of the enclosure shall be as specified in the manufacturer's instructions for installation height. If no instructions are provided, the enclosure height shall be 36 inches. The dishwasher must be installed from the top and mounted to the edges of the enclosure.

2.1.2 Dishwashers without a Direct Water Line.

Manually fill the built-in water reservoir to the full capacity reported by the manufacturer, using water at a temperature in accordance with section 2.3 of AHAM DW-1-2020.

2.2 Water pressure.

The water pressure requirements described in section 2.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line.

2.3 Non-soil-sensing and soil-sensing dishwashers to be tested at a nominal inlet temperature of 50 °F, 120 °F, or 140 °F.

The test load and soiling requirements for all non-soil-sensing and soil-sensing dishwashers shall be the same as those requirements specified in section 2.6.3 of AHAM DW-1-2020 for soil-sensing dishwashers. Additionally, both non-soil-sensing and soil-sensing compact dishwashers that have a capacity of less than four place settings shall be tested at the rated capacity of the dishwasher and the test load shall be soiled as follows at each soil load:

(a) Heavy soil load: soil two-thirds of the place settings, excluding flatware and serving pieces (rounded up to the nearest integer) or one place setting, whichever is greater;

(b) Medium soil load: soil one-quarter of the place settings, excluding flatware and serving pieces (rounded up to the nearest integer) or one place setting, whichever is smaller;

(c) Light soil load: soil one-quarter of the place settings, excluding flatware and serving pieces (rounded up to the nearest integer) or one place setting, whichever is smaller, using half the quantity of soils specified for one place setting.

2.4 Test load items.

The test load items described in section 2.7.1 of AHAM DW-1-2020 apply to this test procedure, including the applicable provisions of section 3.4 of AHAM DW-2-2020, as referenced in section 2.7.1 of AHAM DW-1-2020. The following test load items may be used in the alternative.

2.5 Preconditioning requirements.

The preconditioning requirements described in section 2.9 of AHAM DW-1-2020 are applicable to all dishwashers except the measurement of the prewash fill water volume, Vpw, if any, and measurement of the main wash fill water volume, Vmw, are not required.

2.6 Detergent.

The detergent requirements described in section 2.10 of AHAM DW-1-2020 are applicable to all dishwashers. For any dishwasher that does not have a main wash detergent compartment and the manufacturer does not recommend a location to place the main wash detergent, place the detergent directly into the dishwasher chamber.

2.7 Connected functionality.

For dishwashers that can communicate through a network (e.g., Bluetooth® or internet connection), disable all network functions that can be disabled by means provided in the manufacturer's user manual, for the duration of testing. If network functions cannot be disabled by means provided in the manufacturer's user manual, conduct the standby power test with network function in the “as-shipped” condition.

2.8 Evaluation Room Lighting Conditions.

The lighting setup in the evaluation room where the test load is scored shall be according to the requirements specified in section 5.10 of AHAM DW-2-2020.

3. Instrumentation

For this test procedure, the test instruments are to be calibrated annually according to the specifications in section 3.1 through 3.7 of AHAM DW-1-2020, including the applicable provisions of IEC 62301 as referenced in section 3.6 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

3.1 Water meter.

The water meter requirements described in section 3.3 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water meter conditions do not apply and water is added manually pursuant to section 2.1.1 of this appendix.

3.2 Water pressure gauge.

The water pressure gauge requirements described in section 3.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water pressure gauge conditions do not apply and water is added manually pursuant to section 2.1.1 of this appendix.

4. Test Cycle and Measurements

The test cycle and measurement specifications in sections 4.1 through 4.2 of AHAM DW-1-2020 and the scoring specifications in section 5.10.1.1 of AHAM DW-2-2020 apply to this test procedure, including section 5.1, note 1, and section 5.3.2 of IEC 62301 as referenced in section 4.2 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

4.1 Active mode cycle.

The active mode energy consumption measurement requirements described in section 4.1 of AHAM DW-1-2020 are applicable to all dishwashers. Additionally, the following requirements are also applicable:

(a) After the completion of each test cycle (sensor heavy response, sensor medium response, and sensor light response), the test load shall be scored according to section 4.2 of this appendix and its cleaning index calculated according to section 5.1 of this appendix.

(b) A test cycle is considered valid if its cleaning index is 70 or higher; otherwise, the test cycle is invalid and the data from that test run is discarded.

(c) For soil-sensing dishwashers, if the test cycle at any soil load is invalid, clean the dishwasher filter according to manufacturer's instructions and repeat the test at that soil load on the most energy-intensive cycle (determined as provided in section 4.1.1 of this appendix) that achieves a cleaning index of 70 or higher.

(d) For non-soil-sensing dishwashers, perform testing as described in section 4.1.a through 4.1.c of this appendix, except that, if a test cycle at a given soil load meets the cleaning index threshold criteria of 70 when tested on the normal cycle, no further testing is required for test cycles at lesser soil loads.

4.1.1 Determination of most energy-intensive cycle.

If the most energy-intensive cycle is not known and needs to be determined via testing, ensure the filter is cleaned as specified in the manufacturer's instructions and test each available cycle type, selecting the default cycle options for that cycle type. In the absence of manufacturer recommendations on washing and drying temperature options, the highest energy consumption options must be selected. Following the completion of each test cycle, the machine electrical energy consumption and water consumption shall be measured according to sections 4.1.1 and 4.1.4 of AHAM DW-1-2020, respectively. The total cycle energy consumption, EMEI, of each tested cycle type shall be calculated according to section 5.2 of this appendix. The most energy-intensive cycle is the cycle type with the highest value of EMEI.

For standard dishwashers, test each cycle with a clean load of eight place settings plus six serving pieces, as specified in section 2.7 of AHAM DW-1-2020. For compact dishwashers, test each cycle with a clean load of four place settings plus six serving pieces, as specified in section 2.7 of AHAM DW-1-2020. If the capacity of the dishwasher, as stated by the manufacturer, is less than four place settings, then the test load must be the stated capacity.

4.1.2 Water consumption.

The water consumption requirements described in section 4.1.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water consumption measurement requirements do not apply and water consumption, V, is the value reported by the manufacturer.

4.2 Scoring.

Following the termination of an active mode test, each item in the test load shall be scored on a scale from 0 to 9 according to the instructions in section 5.10.1.1 of AHAM DW-2-2020.

5. Calculation of Derived Results From Test Measurements

The calculations in sections 5.1 through 5.7 of AHAM DW-1-2020 and section 5.12.3.1 of AHAM DW-2-2020 apply to this test procedure. The following additional requirements are also applicable:

(a) For both soil-sensing and non-soil-sensing dishwashers, use the equations specified for soil-sensing dishwashers.

(b) If a non-soil-sensing dishwasher is not tested at a certain soil load as specified in section 4.1.d of this appendix, use the energy and water consumption values of the preceding soil load when calculating the weighted average energy and water consumption values (i.e., if the sensor medium response and sensor light response tests on the normal cycle are not conducted, use the values of the sensor heavy response test for all three soil loads; if only the sensor light response test is not conducted, use the values of the sensor medium response test for the sensor light response test).

(c) For dishwashers that do not have a direct water line, water consumption is equal to the volume of water use in the test cycle, as specified by the manufacturer.

(d) In sections 5.6.1.3, 5.6.1.4, 5.6.2.3, and 5.6.2.4 of AHAM DW-1-2020, use (C/e) in place of K.

5.1 Cleaning Index.

Determine the per-cycle cleaning index for each test cycle using the equation in section 5.12.3.1 of AHAM DW-2-2020.

5.2 Calculation for determination of the most energy-intensive cycle type.

The total cycle energy consumption for the determination of the most energy-intensive cycle specified in section 4.1.1 of this appendix is calculated for each tested cycle type as:

EMEI = M + EF−(ED/2) + W where, M = per-cycle machine electrical energy consumption, expressed in kilowatt hours per cycle, EF = fan-only mode electrical energy consumption, if available on the tested cycle type, expressed in kilowatt hours per cycle, ED = drying energy consumed using the power-dry feature after the termination of the last rinse option of the tested cycle type, if available on the tested cycle type, expressed in kilowatt hours per cycle, and W = water energy consumption and is defined as: V × T × K, for dishwashers using electrically heated water, and V × T × C/e, for dishwashers using gas-heated or oil-heated water.

Additionally,

V = water consumption in gallons per cycle, T = nominal water heater temperature rise and is equal to 90 °F for dishwashers that operate with a nominal 140 °F inlet water temperature, and 70 °F for dishwashers that operate with a nominal 120 °F inlet water temperature, K = specific heat of water in kilowatt-hours per gallon per degree Fahrenheit = 0.0024, C = specific heat of water in Btu's per gallon per degree Fahrenheit = 8.2, and e = nominal gas or oil water heater recovery efficiency = 0.75. [88 FR 3279, Jan. 18, 2023]

Note:

The procedures in either this appendix or appendix D2 to this subpart must be used to determine compliance with the energy conservation standards for clothes dryers provided at § 430.32(h)(3). Manufacturers must use a single appendix for all representations, including certifications of compliance, and may not use this appendix for certain representations and appendix D2 to this subpart for other representations. The procedures in appendix D2 to this subpart must be used to determine compliance with the energy conservation standards for clothes dryers provided at § 430.32(h)(4).

0. Incorporation by Reference

DOE incorporated by reference in § 430.3 the standards for AHAM HLD-1 and IEC 62301, in their entirety, however, only enumerated provisions of those documents are applicable to this appendix. In cases where there is a conflict between any industry standard(s) and this appendix, the language of the test procedure in this appendix takes precedence over the industry standard(s).

(1) AHAM HLD-1:

(i) Section 3.3.5.1 “Standard Simulator” as referenced in sections 2.1.2 through 2.1.3 of this appendix.

(ii) [Reserved]

(2) IEC 62301:

(i) Section 5, Paragraph 5.1, Note 1 as referenced in section 3.6.2 of this appendix.

(ii) Section 5, Paragraph 5.3.2 “Sampling Method” as referenced in section 3.6.3 of this appendix.

1. Definitions

1.1 “Active mode” means a mode in which the clothes dryer is connected to a main power source, has been activated and is performing the main function of tumbling the clothing with or without heated or unheated forced air circulation to remove moisture from the clothing, remove wrinkles or prevent wrinkling of the clothing, or both.

1.2 “AHAM” means the Association of Home Appliance Manufacturers.

1.3 “AHAM HLD-1” means the test standard published by the Association of Home Appliance Manufacturers, titled “Household Tumble Type Clothes Dryers,” ANSI-approved June 11, 2010, ANSI/AHAM HLD-1-2010.

1.4 “Automatic termination control” means a dryer control system with a sensor which monitors either the dryer load temperature or its moisture content and with a controller which automatically terminates the drying process. A mark, detent, or other visual indicator or detent which indicates a preferred automatic termination control setting must be present if the dryer is to be classified as having an “automatic termination control.” A mark is a visible single control setting on one or more dryer controls.

1.5 “Bone dry” means a condition of a load of test cloths which has been dried in a dryer at maximum temperature for a minimum of 10 minutes, removed, and weighed before cool down, and then dried again for 10-minute periods until the final weight change of the load is 1 percent or less.

1.6 “Compact” or “compact size” means a clothes dryer with a drum capacity of less than 4.4 cubic feet.

1.7 “Cool down” means that portion of the clothes drying cycle when the added gas or electric heat is terminated and the clothes continue to tumble and dry within the drum.

1.8 “Cycle” means a sequence of operation of a clothes dryer which performs a clothes drying operation, and may include variations or combinations of the functions of heating, tumbling, and drying.

1.9 “Drum capacity” means the volume of the drying drum in cubic feet.

1.10 “IEC 62301” (Second Edition) means the test standard published by the International Electrotechnical Commission (“IEC”) titled “Household electrical appliances—Measurement of standby power,” Publication 62301 (Edition 2.0 2011-01) (incorporated by reference; see § 430.3).

1.11 “Final moisture content” (“FMC”) means the ratio of the weight of water contained by the dry test load (i.e., after completion of the drying cycle) to the bone-dry weight of the test load, expressed as a percent.

1.12 “Inactive mode” means a standby mode that facilitates the activation of active mode by remote switch (including remote control), internal sensor, or timer, or that provides continuous status display.

1.13 “Initial moisture content” (“IMC”) means the ratio of the weight of water contained by the damp test load (i.e., prior to completion of the drying cycle) to the bone-dry weight of the test load, expressed as a percent.

1.14 “Moisture content” means the ratio of the weight of water contained by the test load to the bone-dry weight of the test load, expressed as a percent.

1.15 “Off mode” means a mode in which the clothes dryer is connected to a main power source and is not providing any active or standby mode function, and where the mode may persist for an indefinite time. An indicator that only shows the user that the product is in the off position is included within the classification of an off mode.

1.16 “Standard size” means a clothes dryer with a drum capacity of 4.4 cubic feet or greater.

1.17 “Standby mode” means any product modes where the energy using product is connected to a main power source and offers one or more of the following user-oriented or protective functions which may persist for an indefinite time:

(a) To facilitate the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer.

(b) Continuous functions, including information or status displays (including clocks) or sensor-based functions. A timer is a continuous clock function (which may or may not be associated with a display) that provides regular scheduled tasks (e.g., switching) and that operates on a continuous basis.

1.18 “Vented clothes dryer” means a clothes dryer that exhausts the evaporated moisture from the cabinet.

1.19 “Ventless clothes dryer” means a clothes dryer that uses a closed-loop system with an internal condenser to remove the evaporated moisture from the heated air. The moist air is not discharged from the cabinet.

2. Testing Conditions

2.1 Installation.

2.1.1 All clothes dryers. For both vented clothes dryers and ventless clothes dryers, install the clothes dryer in accordance with manufacturer's instructions as shipped with the unit. If the manufacturer's instructions do not specify the installation requirements for a certain component, it shall be tested in the as-shipped condition. Where the manufacturer gives the option to use the dryer both with and without a duct, the dryer shall be tested without the exhaust simulator described in section 3.3.5.1 of AHAM HLD-1 (incorporated by reference; see § 430.3). All external joints should be taped to avoid air leakage. For drying testing, disconnect all lights, such as task lights, that do not provide any information related to the drying process on the clothes dryer and that do not consume more than 10 watts during the clothes dryer test cycle. Control setting indicator lights showing the cycle progression, temperature or dryness settings, or other cycle functions that cannot be turned off during the test cycle shall not be disconnected during the active mode test cycle. For standby and off mode testing, the clothes dryer shall also be installed in accordance with section 5, paragraph 5.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3), disregarding the provisions regarding batteries and the determination, classification, and testing of relevant modes. For standby and off mode testing, all lighting systems shall remain connected.

2.1.2 Vented clothes dryers. For vented clothes dryers, the dryer exhaust shall be restricted by adding the AHAM exhaust simulator described in section 3.3.5.1 of AHAM HLD-1.

2.1.3 Ventless clothes dryers. For ventless clothes dryers, the dryer shall be tested without the AHAM exhaust simulator. If the manufacturer gives the option to use a ventless clothes dryer, with or without a condensation box, the dryer shall be tested with the condensation box installed. For ventless clothes dryers, the condenser unit of the dryer must remain in place and not be taken out of the dryer for any reason between tests.

2.2 Ambient temperature and humidity.

2.2.1 For drying testing, maintain the room ambient air temperature at 75 ±3 °F and the room relative humidity at 50 percent ±10 percent relative humidity.

2.2.2 For standby and off mode testing, maintain room ambient air temperature conditions as specified in section 4, paragraph 4.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3)

2.3 Energy supply.

2.3.1 Electrical supply. Maintain the electrical supply at the clothes dryer terminal block within 1 percent of 120/240 or 120/208Y or 120 volts as applicable to the particular terminal block wiring system and within 1 percent of the nameplate frequency as specified by the manufacturer. If the dryer has a dual voltage conversion capability, conduct the test at the highest voltage specified by the manufacturer.

2.3.1.1 Supply voltage waveform. For the clothes dryer standby mode and off mode testing, maintain the electrical supply voltage waveform indicated in section 4, paragraph 4.3.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3). If the power measuring instrument used for testing is unable to measure and record the total harmonic content during the test measurement period, it is acceptable to measure and record the total harmonic content immediately before and after the test measurement period.

2.3.2 Gas supply.

2.3.2.1 Natural gas supply. Maintain the gas supply to the clothes dryer immediately ahead of all controls at a pressure of 7 to 10 inches of water column. The natural gas supplied should have a heating value of approximately 1,025 Btus per standard cubic foot. The actual heating value, Hn2, in Btus per standard cubic foot, for the natural gas to be used in the test shall be obtained either from measurements using a standard continuous flow calorimeter as described in section 2.4.6 of this appendix or by the purchase of bottled natural gas whose Btu rating is certified to be at least as accurate a rating as could be obtained from measurements with a standard continuous flow calorimeter as described in section 2.4.6 of this appendix.

2.3.2.2 Propane gas supply. Maintain the gas supply to the clothes dryer immediately ahead of all controls at a pressure of 11 to 13 inches of water column. The propane gas supplied should have a heating value of approximately 2,500 Btus per standard cubic foot. The actual heating value, Hp, in Btus per standard cubic foot, for the propane gas to be used in the test shall be obtained either from measurements using a standard continuous flow calorimeter as described in section 2.4.6 of this appendix or by the purchase of bottled gas whose Btu rating is certified to be at least as accurate a rating as could be obtained from measurement with a standard continuous calorimeter as described in section 2.4.6 of this appendix.

2.3.2.3 Hourly Btu Rating. Maintain the hourly Btu rating of the burner within ±5 percent of the rating specified by the manufacturer. If the hourly Btu rating of the burner cannot be maintained within ±5 percent of the rating specified by the manufacturer, make adjustments in the following order until an hourly Btu rating of the burner within ±5 percent of the rating specified by the manufacturer is achieved:

(1) Modify the gas inlet supply pressure within the allowable range specified in section 2.3.2.1 or 2.3.2.2 of this appendix, as applicable;

(2) If the clothes dryer is equipped with a gas pressure regulator, modify the outlet pressure of the gas pressure regulator within ±10 percent of the value recommended by the manufacturer in the installation manual, on the nameplate sticker, or wherever the manufacturer makes such a recommendation for the basic model; and

(3) Modify the orifice as necessary to achieve the required hourly Btu rating.

2.4 Instrumentation. Perform all test measurements using the following instruments as appropriate.

2.4.1 Weighing scales.

2.4.1.1 Weighing scale for test cloth. The scale shall have a range of 0 to a maximum of 60 pounds with a resolution of at least 0.001 pounds and a maximum error no greater than 0.1 percent of any measured value within the range of 3 to 15 pounds.

2.4.1.2 Weighing scale for drum capacity measurements. The scale should have a range of 0 to a maximum of 600 pounds with resolution of 0.50 pounds and a maximum error no greater than 0.5 percent of the measured value.

2.4.2 Kilowatt-hour meter. The kilowatt-hour meter shall have a resolution of 0.001 kilowatt-hours and a maximum error no greater than 0.5 percent of the measured value.

2.4.3 Gas meter. The gas meter shall have a resolution of 0.001 cubic feet and a maximum error no greater than 0.5 percent of the measured value.

2.4.4 Dry and wet bulb psychrometer. The dry and wet bulb psychrometer shall have an error no greater than ±1 °F. A relative humidity meter with a maximum error tolerance expressed in °F equivalent to the requirements for the dry and wet bulb psychrometer or with a maximum error tolerance of ±2 percent relative humidity would be acceptable for measuring the ambient humidity.

2.4.5 Temperature. The temperature sensor shall have an error no greater than ±1 °F.

2.4.6 Standard Continuous Flow Calorimeter. The calorimeter shall have an operating range of 750 to 3,500 Btu per cubic feet. The maximum error of the basic calorimeter shall be no greater than 0.2 percent of the actual heating value of the gas used in the test. The indicator readout shall have a maximum error no greater than 0.5 percent of the measured value within the operating range and a resolution of 0.2 percent of the full-scale reading of the indicator instrument.

2.4.7 Standby mode and off mode watt meter. The watt meter used to measure standby mode and off mode power consumption shall meet the requirements specified in section 4, paragraph 4.4 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3). If the power measuring instrument used for testing is unable to measure and record the crest factor, power factor, or maximum current ratio during the test measurement period, it is acceptable to measure the crest factor, power factor, and maximum current ratio immediately before and after the test measurement period.

2.5 Lint trap. Clean the lint trap thoroughly before each test run.

2.6 Test Cloths.

2.6.1 Energy test cloth. The energy test cloth shall be clean and consist of the following:

(a) Pure finished bleached cloth, made with a momie or granite weave, which is a blended fabric of 50-percent cotton and 50-percent polyester and weighs within + 10 percent of 5.75 ounces per square yard after test cloth preconditioning, and has 65 ends on the warp and 57 picks on the fill. The individual warp and fill yarns are a blend of 50-percent cotton and 50-percent polyester fibers.

(b) Cloth material that is 24 inches by 36 inches and has been hemmed to 22 inches by 34 inches before washing. The maximum shrinkage after five washes shall not be more than 4 percent on the length and width.

(c) The number of test runs on the same energy test cloth shall not exceed 25 runs.

2.6.2 Energy stuffer cloths. The energy stuffer cloths shall be made from energy test cloth material, and shall consist of pieces of material that are 12 inches by 12 inches and have been hemmed to 10 inches by 10 inches before washing. The maximum shrinkage after five washes shall not be more than 4 percent on the length and width. The number of test runs on the same energy stuffer cloth shall not exceed 25 runs after test cloth preconditioning.

2.6.3 Test Cloth Preconditioning.

A new test cloth load and energy stuffer cloths shall be treated as follows:

(1) Bone dry the load to a weight change of ±1 percent, or less, as prescribed in section 1.5.

(2) Place the test cloth load in a standard clothes washer set at the maximum water fill level. Wash the load for 10 minutes in soft water (17 parts per million hardness or less), using 60.8 grams of AHAM standard test detergent Formula 3. Wash water temperature is to be controlled at 140 ° ±5 °F (60 ° ±2.7 °C). Rinse water temperature is to be controlled at 100 ° ±5 °F (37.7 ±2.7 °C).

(3) Rinse the load again at the same water temperature.

(4) Bone dry the load as prescribed in section 1.5 and weigh the load.

(5) This procedure is repeated until there is a weight change of 1 percent or less.

(6) A final cycle is to be a hot water wash with no detergent, followed by two warm water rinses.

2.7 Test loads.

2.7.1 Load size. Determine the load size for the unit under test, according to Table 1 of this section.

Each test load must consist of energy test cloths and no more than five energy stuffer cloths.

2.7.2 Test load preparation. Dampen the load by agitating it in water whose temperature is 60 °F ± 5 °F and consists of 0 to 17 parts per million hardness for approximately 2 minutes in order to saturate the fabric. Then, extract water from the wet test load by spinning the load to a target moisture content between 54.0-61.0 percent of the bone-dry weight of the test load. If after extraction the moisture content is less than 54.0 percent, make a final mass adjustment, such that the moisture content is between 54.0-61.0 percent of the bone-dry weight of the test load, by adding water uniformly distributed among all of the test cloths in a very fine spray using a spray bottle.

2.7.3 Method of loading. Load the energy test cloths by grasping them in the center, shaking them to hang loosely, and then dropping them in the dryer at random.

2.8 Clothes dryer preconditioning.

2.8.1 Vented clothes dryers. For vented clothes dryers, before any test cycle, operate the dryer without a test load in the non-heat mode for 15 minutes or until the discharge air temperature is varying less than 1 °F for 10 minutes—whichever is longer—in the test installation location with the ambient conditions within the specified test condition tolerances of section 2.2 of this appendix.

2.8.2 Ventless clothes dryers. For ventless clothes dryers, before any test cycle, the steady-state machine temperature must be equal to ambient room temperature described in 2.2.1. This may be done by leaving the machine at ambient room conditions for at least 12 hours between tests.

3. Test Procedures and Measurements

3.1 Drum Capacity. Measure the drum capacity by sealing all openings in the drum except the loading port with a plastic bag, and ensuring that all corners and depressions are filled and that there are no extrusions of the plastic bag through any openings in the interior of the drum. Support the dryer's rear drum surface on a platform scale to prevent deflection of the drum surface, and record the weight of the empty dryer. Fill the drum with water to a level determined by the intersection of the door plane and the loading port (i.e., the uppermost edge of the drum that is in contact with the door seal). Record the temperature of the water and then the weight of the dryer with the added water and then determine the mass of the water in pounds. Add the appropriate volume to account for any space in the drum interior not measured by water fill (e.g., the space above the uppermost edge of the drum within a curved door) and subtract the appropriate volume to account for space that is measured by water fill but cannot be used when the door is closed (e.g., space occupied by the door when closed). The drum capacity is calculated to the nearest 0.1 cubic foot as follows:

C = w/d ±volume adjustment C = capacity in cubic feet. w = mass of water in pounds. d = density of water at the measured temperature in pounds per cubic foot.

3.2 Dryer Loading. Load the dryer as specified in 2.7.

3.3 Test cycle. Operate the clothes dryer at the maximum temperature setting and, if equipped with a timer, at the maximum time setting. Any other optional cycle settings that do not affect the temperature or time settings shall be tested in the as-shipped position, except that if the clothes dryer has network capabilities, the network settings must be disabled throughout testing if such settings can be disabled by the end-user and the product's user manual provides instructions on how to do so. If the network settings cannot be disabled by the end-user, or the product's user manual does not provide instruction for disabling network settings, then the unit must be tested with the network settings in the factory default configuration for the test cycle. If the clothes dryer does not have a separate temperature setting selection on the control panel, the maximum time setting should be used for the drying test cycle. Dry the load until the moisture content of the test load is between 2.5 and 5.0 percent of the bone-dry weight of the test load, at which point the test cycle is stopped, but do not permit the dryer to advance into cool down. If required, reset the timer to increase the length of the drying cycle. After stopping the test cycle, remove and weigh the test load within 5 minutes following termination of the test cycle. The clothes dryer shall not be stopped intermittently in the middle of the test cycle for any reason. Record the data specified by section 3.4 of this appendix. If the dryer automatically stops during a cycle because the condensation box is full of water, the test is stopped, and the test run is invalid, in which case the condensation box shall be emptied and the test re-run from the beginning. For ventless clothes dryers, during the time between two cycles, the door of the dryer shall be closed except for loading and unloading.

3.4 Data recording. Record for each test cycle:

3.4.1 Bone-dry weight of the test load, Wbonedry, as described in section 2.7.1 of this appendix.

3.4.2 Moisture content of the wet test load before the test, IMC, as described in section 2.7.2 of this appendix.

3.4.3 Moisture content of the dry test load obtained after the test, FMC, as described in section 3.3 of this appendix.

3.4.4 Test room conditions, temperature, and percent relative humidity described in 2.2.1.

3.4.5 For electric dryers—the total kilowatt-hours of electric energy, Et, consumed during the test described in 3.3.

3.4.6 For gas dryers:

3.4.6.1 Total kilowatt-hours of electrical energy, Ete, consumed during the test described in 3.3.

3.4.6.2 Cubic feet of gas per cycle, Etg, consumed during the test described in 3.3.

3.4.6.3 Correct the gas heating value, GEF, as measured in 2.3.2.1 and 2.3.2.2, to standard pressure and temperature conditions in accordance with U.S. Bureau of Standards, circular C417, 1938.

3.5 Test for automatic termination field use factor. The field use factor for automatic termination can be claimed for those dryers which meet the requirements for automatic termination control, defined in 1.4.

3.6 Standby mode and off mode power. Connect the clothes dryer to a watt meter as specified in section 2.4.7 of this appendix. Establish the testing conditions set forth in section 2 of this appendix.

3.6.1 Perform standby mode and off mode testing after completion of an active mode drying cycle included as part of the test cycle; after removing the test load; without changing the control panel settings used for the active mode drying cycle; with the door closed; and without disconnecting the electrical energy supply to the clothes dryer between completion of the active mode drying cycle and the start of standby mode and off mode testing.

3.6.2 For clothes dryers that take some time to automatically enter a stable inactive mode or off mode state from a higher power state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301, allow sufficient time for the clothes dryer to automatically reach the default inactive/off mode state before proceeding with the test measurement.

3.6.3 Once the stable inactive/off mode state has been reached, measure and record the default inactive/off mode power, Pdefault, in watts, following the test procedure for the sampling method specified in Section 5, Paragraph 5.3.2 of IEC 62301.

3.6.4 For a clothes dryer with a switch (or other means) that can be optionally selected by the end user to achieve a lower-power inactive/off mode state than the default inactive/off mode state measured in section 3.6.3 of this appendix, after performing the measurement in section 3.6.3 of this appendix, activate the switch (or other means) to the position resulting in the lowest power consumption and repeat the measurement procedure described in section 3.6.3 of this appendix. Measure and record the lowest inactive/off mode power, Plowest, in watts.

4. Calculation of Derived Results From Test Measurements

4.1 Total per-cycle electric dryer energy consumption. Calculate the total electric dryer energy consumption per cycle, Ece, expressed in kilowatt-hours per cycle and defined as:

Ece = [53.5/(IMC − FMC)] × Et × field use, Where: Et = the energy recorded in section 3.4.5 of this appendix. 53.5 = an experimentally established value for the percent reduction in the moisture content of the test load during a laboratory test cycle expressed as a percent. field use = field use factor, = 1.18 for clothes dryers with time termination control systems only without any automatic termination control functions. = 1.04 for clothes dryers with automatic control systems that meet the requirements of the definition for automatic termination control in section 1.4 of this appendix, including those that also have a supplementary timer control, or that may also be manually controlled. IMC = the moisture content of the wet test load as recorded in section 3.4.2 of this appendix. FMC = the moisture content of the dry test load as recorded in section 3.4.3 of this appendix.

4.2 Per-cycle gas dryer electrical energy consumption. Calculate the gas dryer electrical energy consumption per cycle, Ege, expressed in kilowatt-hours per cycle and defined as:

Ege = [53.5/(IMC − FMC)] × Ete × field use, Where: Ete = the energy recorded in section 3.4.6.1 of this appendix. field use, 53.5, MCw, and MCd as defined in section 4.1 of this appendix.

4.3 Per-cycle gas dryer gas energy consumption. Calculate the gas dryer gas energy consumption per cycle, Egg, expressed in Btus per cycle and defined as:

Egg = [53.5/(MCw − MCd)] × Etg × field use × GEF Where: Etg = the energy recorded in section 3.4.6.2 of this appendix. GEF = corrected gas heat value (Btu per cubic feet) as defined in section 3.4.6.3 of this appendix. field use, 53.5, IMC, and FMC as defined in section 4.1 of this appendix.

4.4 Total per-cycle gas dryer energy consumption expressed in kilowatt-hours. Calculate the total gas dryer energy consumption per cycle, Ecg, expressed in kilowatt-hours per cycle and defined as:

Ecg = Ege + (Egg/3412 Btu/kWh) Where: Ege as defined in 4.2 Egg as defined in 4.3

4.5 Per-cycle standby mode and off mode energy consumption. Calculate the clothes dryer per-cycle standby mode and off mode energy consumption, ETSO, expressed in kilowatt-hours per cycle and defined as:

ETSO = [(Pdefault × Sdefault) + (Plowest × Slowest)] × K/283 Where: Pdefault = Default inactive/off mode power, in watts, as measured in section 3.6.3 of this appendix. Plowest = Lowest inactive/off mode power, in watts, as measured in section 3.6.4 of this appendix for clothes dryer with a switch (or other means) that can be optionally selected by the end user to achieve a lower-power inactive/off mode than the default inactive/off mode; otherwise, Plowest=0. Sdefault = Annual hours in default inactive/off mode, defined as 8,620 if no optional lowest-power inactive/off mode is available; otherwise 4,310. Slowest = Annual hours in lowest-power inactive/off mode, defined as 0 if no optional lowest-power inactive/off mode is available; otherwise 4,310. K = Conversion factor of watt-hours to kilowatt-hours = 0.001. 283 = Representative average number of clothes dryer cycles in a year. 8,620 = Combined annual hours for inactive and off mode. 4,310 = One-half of the combined annual hours for inactive and off mode.

4.6 Per-cycle combined total energy consumption expressed in kilowatt-hours. Calculate the per-cycle combined total energy consumption, ECC, expressed in kilowatt-hours per cycle and defined for an electric clothes dryer as:

ECC = Ece + ETSO Where: Ece = the energy recorded in section 4.1 of this appendix, and ETSO = the energy recorded in section 4.5 of this appendix, and defined for a gas clothes dryer as: ECC = Ecg + ETSO Where: Ecg = the energy recorded in section 4.4 of this appendix, and ETSO = the energy recorded in section 4.5 of this appendix.

4.7 Combined Energy Factor in pounds per kilowatt-hour. Calculate the combined energy factor, CEF, expressed in pounds per kilowatt-hour and defined as:

CEF = Wbonedry/ECC Where: Wbonedry = the bone dry test load weight 3.4.1, and ECC = the energy recorded in 4.6 [76 FR 1032, Jan. 6, 2011, as amended at 78 FR 49645, Aug. 14, 2013; 86 FR 56639, Oct. 8, 2021; 89 FR 81305, Oct. 8, 2024]

Note:

The procedures in either appendix D1 to this subpart or this appendix must be used to determine compliance with the energy conservation standards for clothes dryers provided at § 430.32(h)(3). Manufacturers must use a single appendix for all representations, including certifications of compliance, and may not use appendix D1 to this subpart for certain representations and this appendix for other representations. The procedures in this appendix must be used to determine compliance with the energy conservation standards for clothes dryers provided at § 430.32(h)(4). Manufacturers may use this appendix to certify compliance with the clothes dryer standards provided at § 430.32(h)(4) prior to the applicable compliance date for those standards.

Per-cycle standby mode and off mode energy consumption in section 4.5 of this appendix is calculated using the value for the annual representative average number of clothes dryer cycles in a year specified in section 4.5.1(a) of this appendix until March 1, 2028. Beginning on March 1, 2028, per-cycle standby mode and off mode energy consumption in section 4.5 of this appendix is calculated using the value for the annual representative average number of clothes dryer cycles in a year specified in section 4.5.1(b) of this appendix.

0. Incorporation by Reference

DOE incorporated by reference in § 430.3 the entire standard for AHAM HLD-1 and IEC 62301, however, only enumerated provisions of those documents are applicable to this appendix. In cases where there is a conflict between any industry standard(s) and this appendix, the language of the test procedure in this appendix takes precedence over the industry standard(s).

(1) AHAM HLD-1:

(i) Section 3.3.5.1 “Standard Simulator” as referenced in sections 2.1.2 through 2.1.3 of this appendix.

(ii) [Reserved]

(2) IEC 62301:

(i) Section 5, Paragraph 5.1, Note 1 as referenced in section 3.5.2 of this appendix.

(ii) Section 5, Paragraph 5.3.2 “Sampling Method” as referenced in section 3.5.3 of this appendix.

1. Definitions

1.1 “Active mode” means a mode in which the clothes dryer is connected to a main power source, has been activated and is performing the main function of tumbling the clothing with or without heated or unheated forced air circulation to remove moisture from the clothing, remove wrinkles or prevent wrinkling of the clothing, or both.

1.2 “AHAM” means the Association of Home Appliance Manufacturers.

1.3 “AHAM HLD-1” means the test standard published by the Association of Home Appliance Manufacturers, titled “Household Tumble Type Clothes Dryers,” ANSI-approved June 11, 2010, ANSI/AHAM HLD-1-2010.

1.4 “Automatic termination control” means a dryer control system with a sensor which monitors either the dryer load temperature or its moisture content and with a controller which automatically terminates the drying process. A mark, detent, or other visual indicator or detent which indicates a preferred automatic termination control setting must be present if the dryer is to be classified as having an “automatic termination control.” A mark is a visible single control setting on one or more dryer controls.

1.5 “Automatic termination control dryer” means a clothes dryer which can be preset to carry out at least one sequence of operations to be terminated by means of a system assessing, directly or indirectly, the moisture content of the load. An automatic termination control dryer with supplementary timer or that may also be manually controlled shall be tested as an automatic termination control dryer.

1.6 “Bone dry” means a condition of a load of test cloths which has been dried in a dryer at maximum temperature for a minimum of 10 minutes, removed, and weighed before cool down, and then dried again for 10-minute periods until the final weight change of the load is 1 percent or less.

1.7 “Compact” or “compact size” means a clothes dryer with a drum capacity of less than 4.4 cubic feet.

1.8 “Cool down” means that portion of the clothes drying cycle when the added gas or electric heat is terminated and the clothes continue to tumble and dry within the drum.

1.9 “Cycle” means a sequence of operation of a clothes dryer which performs a clothes drying operation, and may include variations or combinations of the functions of heating, tumbling, and drying.

1.10 “Drum capacity” means the volume of the drying drum in cubic feet.

1.11 “Final moisture content” (“FMC”) means the ratio of the weight of water contained by the dry test load (i.e., after completion of the drying cycle) to the bone-dry weight of the test load, expressed as a percent.

1.12 “IEC 62301” (Second Edition) means the test standard published by the International Electrotechnical Commission (“IEC”) titled “Household electrical appliances—Measurement of standby power,” Publication 62301 (Edition 2.0 2011-01) (incorporated by reference; see § 430.3).

1.13 “Initial moisture content” (“IMC”) means the ratio of the weight of water contained by the damp test load (i.e., prior to completion of the drying cycle) to the bone-dry weight of the test load, expressed as a percent.

1.14 “Inactive mode” means a standby mode that facilitates the activation of active mode by remote switch (including remote control), internal sensor, or timer, or that provides continuous status display.

1.15 “Moisture content” means the ratio of the weight of water contained by the test load to the bone-dry weight of the test load, expressed as a percent.

1.16 “Off mode” means a mode in which the clothes dryer is connected to a main power source and is not providing any active or standby mode function, and where the mode may persist for an indefinite time. An indicator that only shows the user that the product is in the off position is included within the classification of an off mode.

1.17 “Standard size” means a clothes dryer with a drum capacity of 4.4 cubic feet or greater.

1.18 “Standby mode” means any product modes where the energy using product is connected to a mains power source and offers one or more of the following user-oriented or protective functions which may persist for an indefinite time:

(a) To facilitate the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer.

(b) Continuous functions, including information or status displays (including clocks) or sensor-based functions. A timer is a continuous clock function (which may or may not be associated with a display) that provides regular scheduled tasks (e.g., switching) and that operates on a continuous basis.

1.19 “Timer dryer” means a clothes dryer that can be preset to carry out at least one operation to be terminated by a timer, but may also be manually controlled, and does not include any automatic termination function.

1.20 “Vented clothes dryer” means a clothes dryer that exhausts the evaporated moisture from the cabinet.

1.21 “Ventless clothes dryer” means a clothes dryer that uses a closed-loop system with an internal condenser to remove the evaporated moisture from the heated air. The moist air is not discharged from the cabinet.

2. Testing Conditions

2.1 Installation.

2.1.1 All clothes dryers. For both vented clothes dryers and ventless clothes dryers, install the clothes dryer in accordance with manufacturer's instructions as shipped with the unit. If the manufacturer's instructions do not specify the installation requirements for a certain component, it shall be tested in the as-shipped condition. Where the manufacturer gives the option to use the dryer both with and without a duct, the dryer shall be tested without the exhaust simulator described in section 3.3.5.1 of AHAM HLD-1 (incorporated by reference; see § 430.3). All external joints should be taped to avoid air leakage. For drying testing, disconnect all lights, such as task lights, that do not provide any information related to the drying process on the clothes dryer and that do not consume more than 10 watts during the clothes dryer test cycle. Control setting indicator lights showing the cycle progression, temperature or dryness settings, or other cycle functions that cannot be turned off during the test cycle shall not be disconnected during the active mode test cycle. For standby and off mode testing, the clothes dryer shall also be installed in accordance with section 5, paragraph 5.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3), disregarding the provisions regarding batteries and the determination, classification, and testing of relevant modes. For standby and off mode testing, all lighting systems shall remain connected.

2.1.2 Vented clothes dryers. For vented clothes dryers, the dryer exhaust shall be restricted by adding the AHAM exhaust simulator described in section 3.3.5.1 of AHAM HLD-1.

2.1.3 Ventless clothes dryers. For ventless clothes dryers, the dryer shall be tested without the AHAM exhaust simulator. If the manufacturer gives the option to use a ventless clothes dryer, with or without a condensation box, the dryer shall be tested with the condensation box installed. For ventless clothes dryers, the condenser unit of the dryer must remain in place and not be taken out of the dryer for any reason between tests.

2.2 Ambient temperature and humidity.

2.2.1 For drying testing, maintain the room ambient air temperature at 75 ±3 F and the room relative humidity at 50 percent ±10 percent relative humidity.

2.2.2 For standby and off mode testing, maintain room ambient air temperature conditions as specified in section 4, paragraph 4.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3).

2.3 Energy supply.

2.3.1 Electrical supply. Maintain the electrical supply at the clothes dryer terminal block within 1 percent of 120/240 or 120/208Y or 120 volts as applicable to the particular terminal block wiring system and within 1 percent of the nameplate frequency as specified by the manufacturer. If the dryer has a dual voltage conversion capability, conduct the test at the highest voltage specified by the manufacturer.

2.3.1.1 Supply voltage waveform. For the clothes dryer standby mode and off mode testing, maintain the electrical supply voltage waveform indicated in section 4, paragraph 4.3.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3). If the power measuring instrument used for testing is unable to measure and record the total harmonic content during the test measurement period, it is acceptable to measure and record the total harmonic content immediately before and after the test measurement period.

2.3.2 Gas supply.

2.3.2.1 Natural gas supply. Maintain the gas supply to the clothes dryer immediately ahead of all controls at a pressure of 7 to 10 inches of water column. The natural gas supplied should have a heating value of approximately 1,025 Btus per standard cubic foot. The actual heating value, Hn2, in Btus per standard cubic foot, for the natural gas to be used in the test shall be obtained either from measurements using a standard continuous flow calorimeter as described in section 2.4.6 of this appendix or by the purchase of bottled natural gas whose Btu rating is certified to be at least as accurate a rating as could be obtained from measurements with a standard continuous flow calorimeter as described in section 2.4.6 of this appendix.

2.3.2.2 Propane gas supply. Maintain the gas supply to the clothes dryer immediately ahead of all controls at a pressure of 11 to 13 inches of water column. The propane gas supplied should have a heating value of approximately 2,500 Btus per standard cubic foot. The actual heating value, Hp, in Btus per standard cubic foot, for the propane gas to be used in the test shall be obtained either from measurements using a standard continuous flow calorimeter as described in section 2.4.6 of this appendix or by the purchase of bottled gas whose Btu rating is certified to be at least as accurate a rating as could be obtained from measurement with a standard continuous calorimeter as described in section 2.4.6 of this appendix.

2.3.2.3 Hourly Btu Rating. Maintain the hourly Btu rating of the burner within ±5 percent of the rating specified by the manufacturer. If the hourly Btu rating of the burner cannot be maintained within ±5 percent of the rating specified by the manufacturer, make adjustments in the following order until an hourly Btu rating of the burner within ±5 percent of the rating specified by the manufacturer is achieved:

(1) Modify the gas inlet supply pressure within the allowable range specified in section 2.3.2.1 or 2.3.2.2 of this appendix, as applicable;

(2) If the clothes dryer is equipped with a gas pressure regulator, modify the outlet pressure of the gas pressure regulator within ±10 percent of the value recommended by the manufacturer in the installation manual, on the nameplate sticker, or wherever the manufacturer makes such a recommendation for the basic model; and

(3) Modify the orifice as necessary to achieve the required hourly Btu rating.

2.4 Instrumentation. Perform all test measurements using the following instruments as appropriate.

2.4.1 Weighing scales.

2.4.1.1 Weighing scale for test cloth. The scale shall have a range of 0 to a maximum of 60 pounds with a resolution of at least 0.001 pounds and a maximum error no greater than 0.1 percent of any measured value within the range of 3 to 15 pounds.

2.4.1.2 Weighing scale for drum capacity measurements. The scale should have a range of 0 to a maximum of 600 pounds with resolution of 0.50 pounds and a maximum error no greater than 0.5 percent of the measured value.

2.4.2 Kilowatt-hour meter. The kilowatt-hour meter shall have a resolution of 0.001 kilowatt-hours and a maximum error no greater than 0.5 percent of the measured value.

2.4.3 Gas meter. The gas meter shall have a resolution of 0.001 cubic feet and a maximum error no greater than 0.5 percent of the measured value.

2.4.4 Dry and wet bulb psychrometer. The dry and wet bulb psychrometer shall have an error no greater than ±1 °F. A relative humidity meter with a maximum error tolerance expressed in °F equivalent to the requirements for the dry and wet bulb psychrometer or with a maximum error tolerance of ±2 percent relative humidity would be acceptable for measuring the ambient humidity.

2.4.5 Temperature. The temperature sensor shall have an error no greater than ±1 °F.

2.4.6 Standard Continuous Flow Calorimeter. The calorimeter shall have an operating range of 750 to 3,500 Btu per cubic foot. The maximum error of the basic calorimeter shall be no greater than 0.2 percent of the actual heating value of the gas used in the test. The indicator readout shall have a maximum error no greater than 0.5 percent of the measured value within the operating range and a resolution of 0.2 percent of the full-scale reading of the indicator instrument.

2.4.7 Standby mode and off mode watt meter. The watt meter used to measure standby mode and off mode power consumption shall meet the requirements specified in section 4, paragraph 4.4 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3). If the power measuring instrument used for testing is unable to measure and record the crest factor, power factor, or maximum current ratio during the test measurement period, it is acceptable to measure the crest factor, power factor, and maximum current ratio immediately before and after the test measurement period.

2.5 Lint trap. Clean the lint trap thoroughly before each test run.

2.6 Test Cloths.

2.6.1 Energy test cloth. The energy test cloth shall be clean and consist of the following:

(a) Pure finished bleached cloth, made with a momie or granite weave, which is a blended fabric of 50-percent cotton and 50-percent polyester and weighs within + 10 percent of 5.75 ounces per square yard after test cloth preconditioning, and has 65 ends on the warp and 57 picks on the fill. The individual warp and fill yarns are a blend of 50-percent cotton and 50-percent polyester fibers.

(b) Cloth material that is 24 inches by 36 inches and has been hemmed to 22 inches by 34 inches before washing. The maximum shrinkage after five washes shall not be more than 4 percent on the length and width.

(c) The number of test runs on the same energy test cloth shall not exceed 25 runs.

2.6.2 Energy stuffer cloths. The energy stuffer cloths shall be made from energy test cloth material, and shall consist of pieces of material that are 12 inches by 12 inches and have been hemmed to 10 inches by 10 inches before washing. The maximum shrinkage after five washes shall not be more than 4 percent on the length and width. The number of test runs on the same energy stuffer cloth shall not exceed 25 runs after test cloth preconditioning.

2.6.3 Test Cloth Preconditioning.

A new test cloth load and energy stuffer cloths shall be treated as follows:

(1) Bone dry the load to a weight change of ±1 percent, or less, as prescribed in section 1.6 of this appendix.

(2) Place the test cloth load in a standard clothes washer set at the maximum water fill level. Wash the load for 10 minutes in soft water (17 parts per million hardness or less), using 60.8 grams of AHAM standard test detergent Formula 3. Wash water temperature should be maintained at 140 °F ±5 °F (60 °C ±2.7 °C). Rinse water temperature is to be controlled at 100 °F ±5 °F (37.7 °C ±2.7 °C).

(3) Rinse the load again at the same water temperature.

(4) Bone dry the load as prescribed in section 1.6 of this appendix and weigh the load.

(5) This procedure is repeated until there is a weight change of 1 percent or less.

(6) A final cycle is to be a hot water wash with no detergent, followed by two warm water rinses.

2.7 Test loads.

2.7.1 Load size. Determine the load size for the unit under test, according to Table 1 of this section.

Each test load must consist of energy test cloths and no more than five energy stuffer cloths.

2.7.2 Test load preparation. Dampen the load by agitating it in water whose temperature is 60 °F ±5 °F and consists of 0 to 17 parts per million hardness for approximately 2 minutes to saturate the fabric. Then, extract water from the wet test load by spinning the load until the moisture content of the load is between 52.5 and 57.5 percent of the bone-dry weight of the test load. Make a final mass adjustment, such that the moisture content is 57.5 percent ±0.33 percent by adding water uniformly distributed among all of the test cloths in a very fine spray using a spray bottle.

2.7.3 Method of loading. Load the energy test cloths by grasping them in the center, shaking them to hang loosely, and then dropping them in the dryer at random.

2.8 Clothes dryer preconditioning.

2.8.1 Vented clothes dryers. For vented clothes dryers, before any test cycle, operate the dryer without a test load in the non-heat mode for 15 minutes or until the discharge air temperature is varying less than 1 °F for 10 minutes—whichever is longer—in the test installation location with the ambient conditions within the specified test condition tolerances of section 2.2 of this appendix.

2.8.2 Ventless clothes dryers. For ventless clothes dryers, before any test cycle, the steady-state machine temperature must be equal to ambient room temperature described in 2.2.1. This may be done by leaving the machine at ambient room conditions for at least 12 hours between tests.

3. Test Procedures and Measurements

3.1 Drum Capacity. Measure the drum capacity by sealing all openings in the drum except the loading port with a plastic bag, and ensuring that all corners and depressions are filled and that there are no extrusions of the plastic bag through any openings in the interior of the drum. Support the dryer's rear drum surface on a platform scale to prevent deflection of the drum surface, and record the weight of the empty dryer. Fill the drum with water to a level determined by the intersection of the door plane and the loading port (i.e., the uppermost edge of the drum that is in contact with the door seal). Record the temperature of the water and then the weight of the dryer with the added water and then determine the mass of the water in pounds. Add the appropriate volume to account for any space in the drum interior not measured by water fill (e.g., the space above the uppermost edge of the drum within a curved door) and subtract the appropriate volume to account for the space that is measured by water fill but cannot be used when the door is closed (e.g., space occupied by the door when closed). The drum capacity is calculated to the nearest 0.1 cubic foot as follows:

C= w/d ±volume adjustment C = capacity in cubic feet. w = mass of water in pounds. d = density of water at the measured temperature in pounds per cubic foot.

3.2 Dryer Loading. Load the dryer as specified in 2.7.

3.3 Test cycle.

3.3.1 Timer dryers. For timer dryers, operate the clothes dryer at the maximum temperature setting and, if equipped with a timer, at the maximum time setting. Any other optional cycle settings that do not affect the temperature or time settings shall be tested in the as-shipped position, except that if the clothes dryer has network capabilities, the network settings must be disabled throughout testing if such settings can be disabled by the end-user and the product's user manual provides instructions on how to do so. If the network settings cannot be disabled by the end-user, or the product's user manual does not provide instruction for disabling network settings, then the unit must be tested with the network settings in the factory default configuration for the test cycle. If the clothes dryer does not have a separate temperature setting selection on the control panel, the maximum time setting should be used for the drying test cycle. Dry the load until the moisture content of the test load is between 1 and 2.5 percent of the bone-dry weight of the test load, at which point the test cycle is stopped, but do not permit the dryer to advance into cool down. If required, reset the timer to increase the length of the drying cycle. After stopping the test cycle, remove and weigh the test load within 5 minutes following termination of the test cycle. The clothes dryer shall not be stopped intermittently in the middle of the test cycle for any reason. Record the data specified by section 3.4 of this appendix. If the dryer automatically stops during a cycle because the condensation box is full of water, the test is stopped, and the test run is invalid, in which case the condensation box shall be emptied and the test re-run from the beginning. For ventless clothes dryers, during the time between two cycles, the door of the dryer shall be closed except for loading and unloading.

3.3.2 Automatic termination control dryers. For automatic termination control dryers, a “normal” program shall be selected for the test cycle. For dryers that do not have a “normal” program, the cycle recommended by the manufacturer for drying cotton or linen clothes shall be selected. Where the drying temperature setting can be chosen independently of the program, it shall be set to the maximum. Where the dryness level setting can be chosen independently of the program, it shall be set to the “normal” or “medium” dryness level setting. If such designation is not provided, then the dryness level shall be set at the mid-point between the minimum and maximum settings. If an even number of discrete settings are provided, use the next-highest setting above the midpoint, in the direction of the maximum dryness setting or next-lowest setting below the midpoint, in the direction of the minimum dryness setting. Any other optional cycle settings that do not affect the program, temperature or dryness settings shall be tested in the as-shipped position, except that if the clothes dryer has network capabilities, the network settings must be disabled throughout testing if such settings can be disabled by the end-user and the product's user manual provides instructions on how to do so. If the network settings cannot be disabled by the end-user, or the product's user manual does not provide instruction for disabling network settings, then the unit must be tested with the network settings in the factory default configuration for the test cycle.

Operate the clothes dryer until the completion of the programmed cycle, including the cool down period. The cycle shall be considered complete when the dryer indicates to the user that the cycle has finished (by means of a display, indicator light, audible signal, or other signal) and the heater and drum/fan motor shuts off for the final time. If the clothes dryer is equipped with a wrinkle prevention mode (i.e., that continuously or intermittently tumbles the clothes dryer drum after the clothes dryer indicates to the user that the cycle has finished) that is activated by default in the as-shipped position or if manufacturers' instructions specify that the feature is recommended to be activated for normal use, the cycle shall be considered complete after the end of the wrinkle prevention mode. After the completion of the test cycle, remove and weigh the test load within 5 minutes following termination of the test cycle. Record the data specified in section 3.4 of this appendix. If the final moisture content is greater than 2 percent, the results from the test are invalid and a second run must be conducted. Conduct the second run of the test on the unit using the highest dryness level setting. If, on this second run, the dryer does not achieve a final moisture content of 2 percent or lower, the dryer has not sufficiently dried the clothes and the test results may not be used for certification of compliance with energy conservation standards. If the dryer automatically stops during a cycle because the condensation box is full of water, the test is stopped, and the test run is invalid, in which case the condensation box shall be emptied and the test re-run from the beginning. For ventless clothes dryers, during the time between two cycles, the door of the dryer shall be closed except for loading and unloading.

3.4 Data recording. Record for each test cycle:

3.4.1 Bone-dry weight of the test load, Wbonedry, as described in section 2.7.1 of this appendix.

3.4.2 Moisture content of the wet test load before the test, IMC, as described in section 2.7.2 of this appendix.

3.4.3 Moisture content of the dry test load obtained after the test, FMC, as described in section 3.3 of this appendix.

3.4.4 Test room conditions, temperature, and percent relative humidity described in 2.2.1.

3.4.5 For electric dryers—the total kilowatt-hours of electric energy, Et, consumed during the test described in 3.3.

3.4.6 For gas dryers:

3.4.6.1 Total kilowatt-hours of electrical energy, Ete, consumed during the test described in 3.3.

3.4.6.2 Cubic feet of gas per cycle, Etg, consumed during the test described in 3.3.

3.4.6.3 Correct the gas heating value, GEF, as measured in 2.3.2.1 and 2.3.2.2, to standard pressure and temperature conditions in accordance with U.S. Bureau of Standards, circular C417, 1938.

3.4.7 The cycle settings selected, in accordance with section 3.3.2 of this appendix, for the automatic termination control dryer test.

3.5 Standby mode and off mode power. Connect the clothes dryer to a watt meter as specified in section 2.4.7 of this appendix. Establish the testing conditions set forth in section 2 of this appendix.

3.5.1 Perform standby mode and off mode testing after completion of an active mode drying cycle included as part of the test cycle; after removing the test load; without changing the control panel settings used for the active mode drying cycle; with the door closed; and without disconnecting the electrical energy supply to the clothes dryer between completion of the active mode drying cycle and the start of standby mode and off mode testing.

3.5.2 For clothes dryers that take some time to automatically enter a stable inactive mode or off mode state from a higher power state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301, allow sufficient time for the clothes dryer to automatically reach the default inactive/off mode state before proceeding with the test measurement.

3.5.3 Once the stable inactive/off mode state has been reached, measure and record the default inactive/off mode power, Pdefault, in watts, following the test procedure for the sampling method specified in Section 5, Paragraph 5.3.2 of IEC 62301.

3.5.4 For a clothes dryer with a switch (or other means) that can be optionally selected by the end user to achieve a lower-power inactive/off mode state than the default inactive/off mode state measured in section 3.5.3 of this appendix, after performing the measurement in section 3.5.3 of this appendix, activate the switch (or other means) to the position resulting in the lowest power consumption and repeat the measurement procedure described in section 3.5.3 of this appendix. Measure and record the lowest inactive/off mode power, Plowest, in watts.

4. Calculation of Derived Results From Test Measurements

4.1 Total per-cycle electric dryer energy consumption. Calculate the total per-cycle electric dryer energy consumption required to achieve a final moisture content of 2 percent or less, Ece, expressed in kilowatt-hours per cycle and defined as:

Ece = Et, for automatic termination control dryers, and, Ece = [55.5/(IMC−FMC)] × Et × field use, for timer dryers Where: 55.5 = an experimentally established value for the percent reduction in the moisture content of the test load during a laboratory test cycle expressed as a percent. Et = the energy recorded in section 3.4.5 of this appendix. field use = 1.18, the field use factor for clothes dryers with time termination control systems only without any automatic termination control functions. IMC = the moisture content of the wet test load as recorded in section 3.4.2 of this appendix. FMC = the moisture content of the dry test load as recorded in section 3.4.3 of this appendix.

4.2 Per-cycle gas dryer electrical energy consumption. Calculate the per-cycle gas dryer electrical energy consumption required to achieve a final moisture content of 2 percent or less, Ege, expressed in kilowatt-hours per cycle and defined as:

Ege = Ete, for automatic termination control dryers, and, Ege = [55.5/(IMC−FMC)] × Ete × field use, for timer dryers Where: Ete = the energy recorded in section 3.4.6.1 of this appendix. field use, 55.5, IMC, and FMC as defined in section 4.1 of this appendix.

4.3 Per-cycle gas dryer gas energy consumption. Calculate the per-cycle gas dryer gas energy consumption required to achieve a final moisture content of 2 percent or less, Egg, expressed in Btus per cycle and defined as:

Egg = Etg × GEF for automatic termination control dryers, and, Egg = [55.5/(IMC−FMC)] × Etg × field use × GEF for timer dryers Where: Etg = the energy recorded in section 3.4.6.2 of this appendix. GEF = corrected gas heat value (Btu per cubic foot) as defined in section 3.4.6.3 of this appendix, field use, 55.5, IMC, and FMC as defined in section 4.1 of this appendix.

4.4 Total per-cycle gas dryer energy consumption expressed in kilowatt-hours. Calculate the total per-cycle gas dryer energy consumption required to achieve a final moisture content of 2 percent or less, Ecg, expressed in kilowatt-hours per cycle and defined as:

Ecg = Ege + (Egg/3412 Btu/kWh) Where: Ege = the energy calculated in section 4.2 of this appendix Egg = the energy calculated in section 4.3 of this appendix

4.5 Per-cycle standby mode and off mode energy consumption. Calculate the clothes dryer per-cycle standby mode and off mode energy consumption, ETSO, expressed in kilowatt-hours per cycle and defined as:

ETSO = [(Pdefault × Sdefault) + (Plowest × Slowest)] × K/Cannual Where: Pdefault = Default inactive/off mode power, in watts, as measured in section 3.5.3 of this appendix. Plowest = Lowest inactive/off mode power, in watts, as measured in section 3.5.4 of this appendix for clothes dryer with a switch (or other means) that can be optionally selected by the end user to achieve a lower-power inactive/off mode than the default inactive/off mode; otherwise, Plowest =0. Sdefault = Annual hours in default inactive/off mode, defined as 8,620 if no optional lowest-power inactive/off mode is available; otherwise 4,310. Slowest = Annual hours in lowest-power inactive/off mode, defined as 0 if no optional lowest-power inactive/off mode is available; otherwise 4,310. K = Conversion factor of watt-hours to kilowatt-hours = 0.001. Cannual = Representative average number of clothes dryer cycles in a year as specified in section 4.5.1. 8,620 = Combined annual hours for inactive and off mode. 4,310 = One-half of the combined annual hours for inactive and off mode.

4.5.1 Representative average number of clothes dryer cycles in a year. Per the Introductory Note:

(1) Cannual = 283 (2) Cannual = 236

4.6 Per-cycle combined total energy consumption expressed in kilowatt-hours. Calculate the per-cycle combined total energy consumption, ECC, expressed in kilowatt-hours per cycle and defined for an electric clothes dryer as:

ECC = Ece + ETSO Where: Ece = the energy calculated in section 4.1 of this appendix, and ETSO = the energy calculated in section 4.5 of this appendix, and defined for a gas clothes dryer as: ECC = Ecg + ETSO Where: Ecg = the energy calculated in section 4.4 of this appendix, and ETSO = the energy calculated in section 4.5 of this appendix.

4.7 Combined Energy Factor in pounds per kilowatt-hour. Calculate the combined energy factor, CEF, expressed in pounds per kilowatt-hour and defined as:

CEF = Wbonedry/ECC Where: Wbonedry = the bone dry test load weight recorded in section 3.4.1 of this appendix, and ECC = the energy calculated in section 4.6 of this appendix. [78 FR 49647, Aug. 14, 2013, as amended at 86 FR 56641, Oct. 8, 2021; 89 FR 81305, Oct. 8, 2024]

Note: Prior to December 18, 2023, representations with respect to the energy use or efficiency of consumer water heaters covered by this test method, including compliance certifications, must be based on testing conducted in accordance with either this appendix as it now appears or appendix E as it appeared at 10 CFR part 430, subpart B revised as of January 1, 2021. Prior to June 15, 2024, representations with respect to the energy use or efficiency of residential-duty commercial water heaters covered by this test method, including compliance certifications, must be based on testing conducted in accordance with either this appendix as it now appears or appendix E as it appeared at 10 CFR part 430, subpart B revised as of January 1, 2021.

On and after December 18, 2023, representations with respect to energy use or efficiency of consumer water heaters covered by this test method, including compliance certifications, must be based on testing conducted in accordance with this appendix, except as described in the paragraphs that follow. On and after June 15, 2024, representations with respect to energy use or efficiency of residential-duty commercial water heaters covered by this test method, including compliance certifications, must be based on testing conducted in accordance with this appendix, except as follows.

Prior to May 6, 2029, consumer water heaters subject to section 4.10 of this appendix may optionally apply the requirements of section 4.10 of this appendix. For residential-duty commercial water heaters subject to section 4.10 of this appendix the requirements of section 4.10 of this appendix may optionally be applied prior to the compliance date of any final rule reviewing potential amended energy conservation standards for this equipment published after June 21, 2023.

Prior to May 6, 2029, consumer water heaters subject to section 5.1.2 of this appendix (as specified at § 429.17(a)(1)(ii)(E) of this chapter) may optionally apply the requirements of section 5.1.2 of this appendix in lieu of the requirements in section 5.1.1 of this appendix.

On or after May 6, 2029, representations with respect to energy use or efficiency of consumer water heaters subject to sections 4.10 and 5.1.2 of this appendix must be based on testing conducted in accordance with those provisions.

0. Incorporation by Reference.

DOE incorporated by reference in § 430.3 the entire standard for: ASHRAE 41.1-2020; ASHRAE 41.6-2014; ASHRAE 118.2-2022; ASTM D2156-09 (R2018); and ASTM E97-1987. However, only enumerated provisions of ASHRAE 118.2-2022 are applicable to this appendix, as follows:

0.1 ASHRAE 118.2-2022

(a) Annex B—Gas Heating Value Correction Factor;

(b) [Reserved]

0.2 [Reserved]

1. Definitions.

1.1. Cut-in means the time when or water temperature at which a water heater control or thermostat acts to increase the energy or fuel input to the heating elements, compressor, or burner.

1.2. Cut-out means the time when or water temperature at which a water heater control or thermostat acts to reduce to a minimum the energy or fuel input to the heating elements, compressor, or burner.

1.3. Design Power Rating means the power rating or input rate that a water heater manufacturer assigns to a particular design of water heater and that is included on the nameplate of the water heater, expressed in kilowatts or Btu (kJ) per hour as appropriate. For modulating water heaters, the design power rating is the maximum power rating or input rate that is specified by the manufacturer on the nameplate of the water heater.

1.4. Draw Cluster means a collection of water draws initiated during the 24-hour simulated-use test during which no successive draws are separated by more than 2 hours.

1.5. First-Hour Rating means an estimate of the maximum volume of “hot” water that a non-flow activated water heater can supply within an hour that begins with the water heater fully heated (i.e., with all thermostats satisfied).

1.6. Flow-Activated describes an operational scheme in which a water heater initiates and terminates heating based on sensing flow.

1.7. Heat Trap means a device that can be integrally connected or independently attached to the hot and/or cold water pipe connections of a water heater such that the device will develop a thermal or mechanical seal to minimize the recirculation of water due to thermal convection between the water heater tank and its connecting pipes.

1.8. Maximum GPM (L/min) Rating means the maximum gallons per minute (liters per minute) of hot water that can be supplied by a flow-activated water heater when tested in accordance with section 5.3.2 of this appendix.

1.19 Water Heater Requiring a Storage Tank means a water heater without a storage tank supplied by the manufacturer that cannot meet the requirements of sections 2 and 5 of this appendix without the use of a storage water heater or unfired hot water storage tank.

1.10. Rated Storage Volume means the water storage capacity of a water heater, in gallons (liters), as certified by the manufacturer pursuant to 10 CFR part 429.

1.11. Recovery Efficiency means the ratio of energy delivered to the water to the energy content of the fuel consumed by the water heater.

1.12. Recovery Period means the time when the main burner of a water heater with a rated storage volume greater than or equal to 2 gallons is raising the temperature of the stored water.

1.13. Split-system heat pump water heater means a heat pump-type water heater in which at least the compressor, which may be installed outdoors, is separate from the storage tank.

1.14. Standby means the time, in hours, during which water is not being withdrawn from the water heater.

1.15. Symbol Usage. The following identity relationships are provided to help clarify the symbology used throughout this procedure:

Cp—specific heat of water Eannual—annual energy consumption of a water heater Eannual,e—annual electrical energy consumption of a water heater Eannual,f—annual fossil-fuel energy consumption of a water heater EX—energy efficiency of a heat pump-type water heater when the 24-hour simulated use test is optionally conducted at any of the additional air temperature conditions as specified in section 2.8 of this appendix, where the subscript “X” corresponds to the dry-bulb temperature at which the test is conducted. Fhr—first-hour rating of a non-flow activated water heater Fmax—maximum GPM (L/min) rating of a flow-activated water heater i—a subscript to indicate the draw number during a test kV—storage tank volume scaling ratio for water heaters with a rated storage volume greater than or equal to 2 gallons Mdel,i—mass of water removed during the ith draw of the 24-hour simulated-use test Min,i—mass of water entering the water heater during the ith draw of the 24-hour simulated-use test M*del,i—for non-flow activated water heaters, mass of water removed during the ith draw during the first-hour rating test M*in,i—for non-flow activated water heaters, mass of water entering the water heater during the ith draw during the first-hour rating test Mdel,10m—for flow-activated water heaters, mass of water removed continuously during the maximum GPM (L/min) rating test Min,10m—for flow-activated water heaters, mass of water entering the water heater continuously during the maximum GPM (L/min) rating test n—for non-flow activated water heaters, total number of draws during the first-hour rating test N—total number of draws during the 24-hour simulated-use test Nr—number of draws from the start of the 24-hour simulated-use test to the end to the first recovery period as described in section 5.4.2 of this appendix Q—total fossil fuel and/or electric energy consumed during the entire 24-hour simulated-use test Qd—daily water heating energy consumption adjusted for net change in internal energy Qda—Qd with adjustment for variation of tank to ambient air temperature difference from nominal value Qdm—overall adjusted daily water heating energy consumption including Qda and QHWD Qe—total electrical energy used during the 24-hour simulated-use test Qf—total fossil fuel energy used by the water heater during the 24-hour simulated-use test Qhr—hourly standby losses of a water heater with a rated storage volume greater than or equal to 2 gallons QHW—daily energy consumption to heat water at the measured average temperature rise across the water heater QHW,67 °F—daily energy consumption to heat quantity of water removed during test over a temperature rise of 67 °F (37.3 °C) QHWD—adjustment to daily energy consumption, QHW, due to variation of the temperature rise across the water heater not equal to the nominal value of 67 °F (37.3 °C) Qr—energy consumption of water heater from the beginning of the test to the end of the first recovery period Qstby—total energy consumed during the standby time interval τstby,1, as determined in section 5.4.2 of this appendix Qsu,0—cumulative energy consumption, including all fossil fuel and electrical energy use, of the water heater from the start of the 24-hour simulated-use test to the start of the standby period as determined in section 5.4.2 of this appendix Qsu,f—cumulative energy consumption, including all fossil fuel and electrical energy use, of the water heater from the start of the 24-hour simulated-use test to the end of the standby period as determined in section 5.4.2 of this appendix T0—mean tank temperature at the beginning of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix T24—mean tank temperature at the end of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix Ta,stby—average ambient air temperature during all standby periods of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix Ta,stby,1—overall average ambient temperature between the start and end of the standby period as determined in section 5.4.2 of this appendix Tt,stby,1— overall average mean tank temperature between the start and end of the standby period as determined in section 5.4.2 of this appendix Tdel—for flow-activated water heaters, average outlet water temperature during the maximum GPM (L/min) rating test Tdel,i—average outlet water temperature during the ith draw of the 24-hour simulated-use test Tin—for flow-activated water heaters, average inlet water temperature during the maximum GPM (L/min) rating test Tst—for water heaters which cannot have internal tank temperature directly measured, estimated average internal storage tank temperature Tp—for water heaters which cannot have internal tank temperature directly measured, average of the inlet and the outlet water temperatures at the end of the period defined by τp Tin,p—for water heaters which cannot have internal tank temperature directly measured, average of the inlet water temperatures Tout,p—for water heaters which cannot have internal tank temperature directly measured, average of the outlet water temperatures Tin,i—average inlet water temperature during the ith draw of the 24-hour simulated-use test Tmax,1—maximum measured mean tank temperature after the first recovery period of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix Tsu,0—maximum measured mean tank temperature at the beginning of the standby period as determined in section 5.4.2 of this appendix Tsu,f—measured mean tank temperature at the end of the standby period as determined in section 5.4.2 of this appendix T*del,i—for non-flow activated water heaters, average outlet water temperature during the ith draw (i = 1 to n) of the first-hour rating test T*max,i—for non-flow activated water heaters, maximum outlet water temperature observed during the ith draw (i = 1 to n) of the first-hour rating test T*min,i—for non-flow activated water heaters, minimum outlet water temperature to terminate the ith draw (i = 1 to n) of the first-hour rating test UA—standby loss coefficient of a water heater with a rated storage volume greater than or equal to 2 gallons UEF—uniform energy factor of a water heater V—the volume of hot water drawn during the applicable draw pattern Vdel,i—volume of water removed during the ith draw (i = 1 to N) of the 24-hour simulated-use test Vin,i—volume of water entering the water heater during the ith draw (i = 1 to N) of the 24-hour simulated-use test V*del,i—for non-flow activated water heaters, volume of water removed during the ith draw (i = 1 to n) of the first-hour rating test V*in,i—for non-flow activated water heaters, volume of water entering the water heater during the ith draw (i = 1 to n) of the first-hour rating test Vdel,10m—for flow-activated water heaters, volume of water removed during the maximum GPM (L/min) rating test Vin,10m—for flow-activated water heaters, volume of water entering the water heater during the maximum GPM (L/min) rating test Vst—measured storage volume of the storage tank for water heaters with a rated storage volume greater than or equal to 2 gallons Veff—effective storage volume vout,p—for water heaters which cannot have internal tank temperature directly measured, average flow rate Wf—weight of storage tank when completely filled with water for water heaters with a rated storage volume greater than or equal to 2 gallons Wt—tare weight of storage tank when completely empty of water for water heaters with a rated storage volume greater than or equal to 2 gallons ηr—recovery efficiency ρ—density of water τp—for water heaters which cannot have internal tank temperature directly measured, duration of the temperature measurement period, determined by the length of time taken for the outlet water temperature to be within 2 °F of the inlet water temperature for 15 consecutive seconds (including the 15-second stabilization period) τstby,1—elapsed time between the start and end of the standby period as determined in section 5.4.2 of this appendix τstby,2—overall time of standby periods when no water is withdrawn during the 24-hour simulated-use test as determined in section 5.4.2 of this appendix

1.16. Temperature Controller means a device that is available to the user to adjust the temperature of the water inside a water heater that stores heated water or the outlet water temperature.

1.17. Thermal break means a thermally non-conductive material that can withstand a pressure of 150 psi (1.034 MPa) at a temperature greater than the maximum temperature the water heater is designed to produce and is utilized to insulate a bypass loop, if one is used in the test set-up, from the inlet piping.

1.18. Uniform Energy Factor means the measure of water heater overall efficiency.

1.19. Water Heater Requiring a Storage Tank means a water heater without a storage tank specified or supplied by the manufacturer that cannot meet the requirements of sections 2 and 5 of this appendix without the use of a storage water heater or unfired hot water storage tank.

2. Test Conditions.

2.1 Installation Requirements. Tests shall be performed with the water heater and instrumentation installed in accordance with section 4 of this appendix.

2.2 Ambient Air Temperature and Relative Humidity.

2.2.1 Non-Heat Pump Water Heaters. The ambient air temperature shall be maintained between 65.0 °F and 70.0 °F (18.3 °C and 21.1 °C) on a continuous basis.

2.2.2 Heat Pump Water Heaters. The dry-bulb temperature shall be maintained at an average of 67.5 °F ± 1 °F (19.7 °C ± 0.6 °C) after a cut-in and before the next cut-out, an average of 67.5 °F ± 2.5 °F (19.7 °C ± 1.4 °C) after a cut-out and before the next cut-in, and at 67.5 °F ± 5 °F (19.7 °C ± 2.8 °C) on a continuous basis throughout the test. The relative humidity shall be maintained within a range of 50% ± 5% throughout the test, and at an average of 50% ± 2% after a cut-in and before the next cut-out.

When testing a split-system heat pump water heater or heat pump water heater requiring a separate storage tank, the heat pump portion of the system shall be tested at the conditions within this section and the separate water heater or unfired hot water storage tank shall be tested at either the conditions within this section or the conditions specified in section 2.2.1 of this appendix.

2.3 Supply Water Temperature. The temperature of the water being supplied to the water heater shall be maintained at 58 °F ± 2 °F (14.4 °C ± 1.1 °C) throughout the test.

2.4 Outlet Water Temperature. The temperature controllers of a non-flow activated water heater shall be set so that water is delivered at a temperature of 125 °F ± 5 °F (51.7 °C ± 2.8 °C).

2.5 Set Point Temperature. The temperature controller of a flow-activated water heater shall be set to deliver water at a temperature of 125 °F ± 5 °F (51.7 °C ± 2.8 °C). If the flow-activated water heater is not capable of delivering water at a temperature of 125 °F ± 5 °F (51.7 °C ± 2.8 °C) when supplied with water at the supply water temperature specified in section 2.3 of this appendix, then the flow-activated water heater shall be set to deliver water at its maximum water temperature.

2.6 Supply Water Pressure. During the test when water is not being withdrawn, the supply pressure shall be maintained between 40 psig (275 kPa) and the maximum allowable pressure specified by the water heater manufacturer.

2.7 Electrical and/or Fossil Fuel Supply.

2.7.1 Electrical. Maintain the electrical supply voltage to within ±2% of the center of the voltage range specified on the nameplate of the water heater by the water heater and/or heat pump manufacturer, from 5 seconds after a cut-in to 5 seconds before next cut-out.

2.7.2 Natural Gas. Maintain the supply pressure in accordance with the supply pressure specified on the nameplate of the water heater by the manufacturer. If the supply pressure is not specified, maintain a supply pressure of 7-10 inches of water column (1.7-2.5 kPa). If the water heater is equipped with a gas appliance pressure regulator and the gas appliance pressure regulator can be adjusted, the regulator outlet pressure shall be within the greater of ±10% of the manufacturer's specified manifold pressure, found on the nameplate of the water heater, or ±0.2 inches water column (0.05 kPa). Maintain the gas supply pressure and manifold pressure only when operating at the design power rating. For all tests, use natural gas having a heating value of approximately 1,025 Btu per standard cubic foot (38,190 kJ per standard cubic meter).

2.7.3 Propane Gas. Maintain the supply pressure in accordance with the supply pressure specified on the nameplate of the water heater by the manufacturer. If the supply pressure is not specified, maintain a supply pressure of 11-13 inches of water column (2.7-3.2 kPa). If the water heater is equipped with a gas appliance pressure regulator and the gas appliance pressure regulator can be adjusted, the regulator outlet pressure shall be within the greater of ±10% of the manufacturer's specified manifold pressure, found on the nameplate of the water heater, or ±0.2 inches water column (0.05 kPa). Maintain the gas supply pressure and manifold pressure only when operating at the design power rating. For all tests, use propane gas with a heating value of approximately 2,500 Btu per standard cubic foot (93,147 kJ per standard cubic meter).

2.7.4 Fuel Oil Supply. Maintain an uninterrupted supply of fuel oil. The fuel pump pressure shall be within ±10% of the pump pressure specified on the nameplate of the water heater or the installation and operations (I&O) manual by the manufacturer. Use fuel oil having a heating value of approximately 138,700 Btu per gallon (38,660 kJ per liter).

2.8 Optional Test Conditions (Heat Pump-Type Water Heaters). The following test conditions may be used for optional representations of EX for heat pump-type water heaters. When conducting a 24-hour simulated use test to determine EX, the test conditions in section 2.1 and sections 2.4 through 2.7 apply. The ambient air temperature and humidity conditions in section 2.2 and the supply water temperature in section 2.3 are replaced with the air temperature, humidity, and supply water temperature conditions as shown in the following table. Testing may optionally be performed at any or all of the conditions in the table, and the sampling plan found at 10 CFR 429.17(a) may be applied for voluntary representations.

3. Instrumentation.

3.1 Pressure Measurements. Pressure-measuring instruments shall have an error no greater than the following values:

3.2 Temperature Measurement

3.2.1 Measurement. Temperature measurements shall be made in accordance with the Standard Method for Temperature Measurement, ASHRAE 41.1-2020, including the conditions as specified in ASHRAE 41.6-2014 as referenced in ASHRAE 41.1-2020, and excluding the steady-state temperature criteria in section 5.5 of ASHRAE 41.1-2020.

3.2.2 Accuracy and Precision. The accuracy and precision of the instruments, including their associated readout devices, shall be within the following limits:

3.2.3 Scale Division. In no case shall the smallest scale division of the instrument or instrument system exceed 2 times the specified precision.

3.2.4 Temperature Difference. Temperature difference between the entering and leaving water may be measured with any of the following:

(a) A thermopile (b) Calibrated resistance thermometers (c) Precision thermometers (d) Calibrated thermistors (e) Calibrated thermocouples (f) Quartz thermometers

3.2.5 Thermopile Construction. If a thermopile is used, it shall be made from calibrated thermocouple wire taken from a single spool. Extension wires to the recording device shall also be made from that same spool.

3.2.6 Time Constant. The time constant of the instruments used to measure the inlet and outlet water temperatures shall be no greater than 2 seconds.

3.3 Liquid Flow Rate Measurement. The accuracy of the liquid flow rate measurement, using the calibration if furnished, shall be equal to or less than ±1% of the measured value in mass units per unit time.

3.4 Electrical Energy. The electrical energy used shall be measured with an instrument and associated readout device that is accurate within ±0.5% of the reading.

3.5 Fossil Fuels. The quantity of fuel used by the water heater shall be measured with an instrument and associated readout device that is accurate within ±1% of the reading.

3.6 Mass Measurements. For mass measurements greater than or equal to 10 pounds (4.5 kg), a scale that is accurate within ±0.5% of the reading shall be used to make the measurement. For mass measurements less than 10 pounds (4.5 kg), the scale shall provide a measurement that is accurate within ±0.1 pound (0.045 kg).

3.7 Heating Value. The higher heating value of the natural gas, propane, or fuel oil shall be measured with an instrument and associated readout device that is accurate within ±1% of the reading. The heating values of natural gas and propane must be corrected from those measured to the standard temperature of 60.0 °F (15.6 °C) and standard pressure of 30 inches of mercury column (101.6 kPa) using the method described in Annex B of ASHRAE 118.2-2022.

3.8 Time. The elapsed time measurements shall be measured with an instrument that is accurate within ±0.5 seconds per hour.

3.9 Volume. Volume measurements shall be measured with an accuracy of ±2% of the total volume.

3.10 Relative Humidity. If a relative humidity (RH) transducer is used to measure the relative humidity of the surrounding air while testing heat pump water heaters, the relative humidity shall be measured with an accuracy of ±1.5% RH.

4. Installation.

4.1 Water Heater Mounting. A water heater designed to be freestanding shall be placed on a 3/4 inch (2 cm) thick plywood platform supported by three 2x4 inch (5 cm x 10 cm) runners. If the water heater is not approved for installation on combustible flooring, suitable non-combustible material shall be placed between the water heater and the platform. Water heaters designed to be installed into a kitchen countertop space shall be placed against a simulated wall section. Wall-mounted water heaters shall be supported on a simulated wall in accordance with the manufacturer-published installation instructions. When a simulated wall is used, the construction shall be 2x4 inch (5 cm x 10 cm) studs, faced with 3/4 inch (2 cm) plywood. For heat pump water heaters not delivered as a single package, the units shall be connected in accordance with the manufacturer-published installation instructions, and the overall system shall be placed on the above-described plywood platform. If installation instructions are not provided by the heat pump manufacturer, uninsulated 8 foot (2.4 m) long connecting hoses having an inside diameter of 5/8 inch (1.6 cm) shall be used to connect the storage tank and the heat pump water heater. With the exception of using the storage tank described in section 4.10 of this appendix, the same requirements shall apply for water heaters requiring a storage tank. The testing of the water heater shall occur in an area that is protected from drafts of more than 50 ft/min (0.25 m/s) from room ventilation registers, windows, or other external sources of air movement.

4.2 Water Supply. Connect the water heater to a water supply capable of delivering water at conditions as specified in sections 2.3 and 2.6 of this appendix.

4.3 Water Inlet and Outlet Configuration. For freestanding water heaters that are taller than 36 inches (91.4 cm), inlet and outlet piping connections shall be configured in a manner consistent with Figures 1 and 2 of section 7 of this appendix. Inlet and outlet piping connections for wall-mounted water heaters shall be consistent with Figure 3 of section 7 of this appendix. For freestanding water heaters that are 36 inches or less in height and not supplied as part of a counter-top enclosure (commonly referred to as an under-the-counter model), inlet and outlet piping shall be installed in a manner consistent with Figures 4, 5, or 6 of section 7 of this appendix. For water heaters that are supplied with a counter-top enclosure, inlet and outlet piping shall be made in a manner consistent with Figures 7a and 7b of section 7 of this appendix, respectively. The vertical piping noted in Figures 7a and 7b shall be located (whether inside the enclosure or along the outside in a recessed channel) in accordance with the manufacturer-published installation instructions.

All dimensions noted in Figures 1 through 7 of section 7 of this appendix must be achieved. All piping between the water heater and inlet and outlet temperature sensors, noted as TIN and TOUT in the figures, shall be Type “L” hard copper having the same diameter as the connections on the water heater. Unions may be used to facilitate installation and removal of the piping arrangements. Install a pressure gauge and diaphragm expansion tank in the supply water piping at a location upstream of the inlet temperature sensor. Install an appropriately rated pressure and temperature relief valve on all water heaters at the port specified by the manufacturer. Discharge piping for the relief valve must be non-metallic. If heat traps, piping insulation, or pressure relief valve insulation are supplied with the water heater, they must be installed for testing. Except when using a simulated wall, provide sufficient clearance such that none of the piping contacts other surfaces in the test room.

At the discretion of the test laboratory, the mass or water delivered may be measured on either the inlet or outlet of the water heater.

For water heaters designed to be used with a mixing valve and that do not have a self-contained mixing valve, a mixing valve shall be installed according to the water heater and/or mixing valve manufacturer's installation instructions. If permitted by the water heater and mixing valve manufacturer's instructions, the mixing valve and cold water junction may be installed where the elbows are located in the outlet and inlet line, respectively. If there are no installation instructions for the mixing valve in the water heater or mixing valve manufacturer's instructions, then the mixing valve shall be installed on the outlet line and the cold water shall be supplied from the inlet line from a junction installed downstream from the location where the inlet water temperature is measured. The outlet water temperature, water flow rate, and/or mass measuring instrumentation, if installed on the outlet side of the water heater, shall be installed downstream from the mixing valve.

4.4 Fuel and/or Electrical Power and Energy Consumption. Install one or more instruments that measure, as appropriate, the quantity and rate of electrical energy and/or fossil fuel consumption in accordance with section 3 of this appendix.

4.5 Internal Storage Tank Temperature Measurements. For water heaters with rated storage volumes greater than or equal to 20 gallons, install six temperature measurement sensors inside the water heater tank with a vertical distance of at least 4 inches (100 mm) between successive sensors. For water heaters with rated storage volumes between 2 and 20 gallons, install three temperature measurement sensors inside the water heater tank. Position a temperature sensor at the vertical midpoint of each of the six equal volume nodes within a tank larger than 20 gallons or the three equal volume nodes within a tank between 2 and 20 gallons. Nodes designate the equal volumes used to evenly partition the total volume of the tank. As much as is possible, the temperature sensor should be positioned away from any heating elements, anodic protective devices, tank walls, and flue pipe walls. If the tank cannot accommodate six temperature sensors and meet the installation requirements specified in this section, install the maximum number of sensors that comply with the installation requirements. Install the temperature sensors through:

(a) The anodic device opening;

(b) The relief valve opening; or

(c) The hot water outlet.

If installed through the relief valve opening or the hot water outlet, a tee fitting or outlet piping, as applicable, must be installed as close as possible to its original location. If the relief valve temperature sensor is relocated, and it no longer extends into the top of the tank, install a substitute relief valve that has a sensing element that can reach into the tank. If the hot water outlet includes a heat trap, install the heat trap on top of the tee fitting. Cover any added fittings with thermal insulation having an R value between 4 and 8 h·ft 2· °F/Btu (0.7 and 1.4 m 2· °C/W). If temperature measurement sensors cannot be installed within the water heater, follow the alternate procedures in section 5.4.2.2 of this appendix.

4.6 Ambient Air Temperature Measurement. Install an ambient air temperature sensor at the vertical midpoint of the water heater and approximately 2 feet (610 mm) from the surface of the water heater. Shield the sensor against radiation.

4.7 Inlet and Outlet Water Temperature Measurements. Install temperature sensors in the cold-water inlet pipe and hot-water outlet pipe as shown in Figures 1, 2, 3, 4, 5, 6, 7a, and 7b of section 7 of this appendix, as applicable.

4.8 Flow Control. Install a valve or valves to provide flow as specified in sections 5.3 and 5.4 of this appendix.

4.9 Flue Requirements.

4.9.1 Gas-Fired Water Heaters. Establish a natural draft in the following manner. For gas-fired water heaters with a vertically discharging draft hood outlet, connect to the draft hood outlet a 5-foot (1.5-meter) vertical vent pipe extension with a diameter equal to the largest flue collar size of the draft hood. For gas-fired water heaters with a horizontally discharging draft hood outlet, connect to the draft hood outlet a 90-degree elbow with a diameter equal to the largest flue collar size of the draft hood, connect a 5-foot (1.5-meter) length of vent pipe to that elbow, and orient the vent pipe to discharge vertically upward. Install direct-vent gas-fired water heaters with venting equipment specified by the manufacturer in the I&O manual using the minimum vertical and horizontal lengths of vent pipe recommended by the manufacturer.

4.9.2 Oil-Fired Water Heaters. Establish a draft at the flue collar at the value specified by the manufacturer in the I&O manual. Establish the draft by using a sufficient length of vent pipe connected to the water heater flue outlet, and directed vertically upward. For an oil-fired water heater with a horizontally discharging draft hood outlet, connect to the draft hood outlet a 90-degree elbow with a diameter equal to the largest flue collar size of the draft hood, connect to the elbow fitting a length of vent pipe sufficient to establish the draft, and orient the vent pipe to discharge vertically upward. Direct-vent oil-fired water heaters should be installed with venting equipment as specified by the manufacturer in the I&O manual, using the minimum vertical and horizontal lengths of vent pipe recommended by the manufacturer.

4.10 Storage Tank Requirement for Water Heaters Requiring a Storage Tank (i.e., Circulating Water Heaters). On or after May 6, 2029, when testing a gas-fired, oil-fired, or electric resistance circulating water heater (i.e., any circulating water heater that does not use a heat pump), the tank to be used for testing shall be an unfired hot water storage tank having volume between 80 and 120 gallons (364-546 liters) determined using the method specified in section 5.2.1 of this appendix that meets but does not exceed the minimum energy conservation standards required according to § 431.110 of this chapter. When testing a heat pump circulating water heater, the tank to be used for testing shall be an electric storage water heater that has a measured volume of 30 gallons (±5 gallons), has a First-Hour Rating less than 51 gallons resulting in classification under the low draw pattern, and has a rated UEF equal to the minimum UEF standard specified at § 430.32(d), rounded to the nearest 0.01. The operational mode of the heat pump circulating water heater and storage water heater paired system shall be set in accordance with section 5.1.1 of this appendix. If the circulating water heater is supplied with a separate non-integrated circulating pump, install this pump as per the manufacturer's installation instructions and include its power consumption in energy use measurements.

4.11 External Communication. If the water heater can connect to an external network or controller, any external communication or connection shall be disabled for the duration of testing; however, the communication module shall remain in an “on” state.

5. Test Procedures.

5.1 Operational Mode Selection. For water heaters that allow for multiple user-selected operational modes, all procedures specified in this appendix shall be carried out with the water heater in the same operational mode (i.e., only one mode).

5.1.1 Testing at Normal Setpoint. The operational mode shall be the default mode (or similarly named, suggested mode for normal operation) as defined by the manufacturer in the I&O manual for giving selection guidance to the consumer. For heat pump water heaters, if a default mode is not defined in the product literature, each test shall be conducted under an operational mode in which both the heat pump and any electric resistance back-up heating element(s) are activated by the unit's control scheme, and which can achieve the internal storage tank temperature specified in this test procedure; if multiple operational modes meet these criteria, the water heater shall be tested under the most energy-intensive mode. If no default mode is specified and the unit does not offer an operational mode that utilizes both the heat pump and the electric resistance back-up heating element(s), the first-hour rating test and the 24-hour simulated-use test shall be tested in heat-pump-only mode. For other types of water heaters where a default mode is not specified, test the unit in all modes and rate the unit using the results of the most energy-intensive mode.

5.1.2 High Temperature Testing. This paragraph applies to electric storage water heaters capable of achieving a Tmax,1 above 135 °F. The following exceptions apply:

(1) Electric storage water heaters that do not have a permanent mode or setting in which the water heater is capable of heating and storing water above 135 °F (as measured by Tmax,1), where permanent mode or setting means a mode of operation that is continuous and does not require any external consumer intervention to maintain for longer than 120 hours;

(2) Electric storage water heaters that meet the definition of “heat pump-type” water heater at § 430.2;

(3) Electric storage water heaters that are only capable of heating the stored water above 135 °F in response to instructions received from a utility or third-party demand-response program.

(4) Electric storage water heaters with measured storage volumes (Vst) less than 20 gallons or greater than 55 gallons.

This paragraph may optionally apply to electric heat pump water heaters for voluntary representations of high-temperature operation only.

For those equipped with factory-installed or built-in mixing valves, set the unit to maintain the highest mean tank temperature possible while delivering water at 125 °F ±5 °F. For those not so equipped, install an ASSE 1017-certified mixing valve in accordance with the provisions in section 4.3 of this appendix and adjust the valve to deliver water at 125 °F ±5 °F when the water heater is operating at its highest storage tank temperature setpoint. Maintain this setting throughout the entirety of the test.

5.2 Water Heater Preparation.

5.2 1 Determination of Storage Tank Volume. For water heaters and separate storage tanks used for testing circulating water heaters, determine the storage capacity, Vst, of the water heater or separate storage tank under test, in gallons (liters), by subtracting the tare weight, Wt, (measured while the tank is empty) from the gross weight of the storage tank when completely filled with water at the supply water temperature specified in section 2.3 of this appendix, Wf, (with all air eliminated and line pressure applied as described in section 2.6 of this appendix) and dividing the resulting net weight by the density of water at the measured temperature.

5.2.2 Setting the Outlet Discharge Temperature.

5.2.2.1 Flow-Activated Water Heaters, including certain instantaneous water heaters and certain storage-type water heaters. Initiate normal operation of the water heater at the design power rating. Monitor the discharge water temperature and set to the value specified in section 2.5 of this appendix in accordance with the manufacturer's I&O manual. If the water heater is not capable of providing this discharge temperature when the flow rate is 1.7 gallons ± 0.25 gallons per minute (6.4 liters ± 0.95 liters per minute), then adjust the flow rate as necessary to achieve the specified discharge water temperature. Once the proper temperature control setting is achieved, the setting must remain fixed for the duration of the maximum GPM test and the 24-hour simulated-use test.

5.2.2.2 All Other Water Heaters.

5.2.2.2.1 Water Heaters with a Single Temperature Controller.

5.2.2.2.1.1 Water Heaters with Rated Volumes Less than 20 Gallons. Starting with a tank at the supply water temperature as specified in section 2.3 of this appendix, initiate normal operation of the water heater. After cut-out, initiate a draw from the water heater at a flow rate of 1.0 gallon ± 0.25 gallons per minute (3.8 liters ± 0.95 liters per minute) for 2 minutes. Starting 15 seconds after commencement of the draw, record the outlet temperature at 15-second intervals until the end of the 2-minute period. Determine whether the maximum outlet temperature is within the range specified in section 2.4 of this appendix. If not, turn off the water heater, adjust the temperature controller, and then drain and refill the tank with supply water at the temperature specified in section 2.3 of this appendix. Then, once again, initiate normal operation of the water heater, and repeat the 2-minute outlet temperature test following cut-out. Repeat this sequence until the maximum outlet temperature during the 2-minute test is within the range specified in section 2.4 of this appendix. Once the proper temperature control setting is achieved, the setting must remain fixed for the duration of the first-hour rating test and the 24-hour simulated-use test.

5.2.2.2.1.2 Water Heaters with Rated Volumes Greater than or Equal to 20 Gallons. Starting with a tank at the supply water temperature specified in section 2.3 of this appendix, initiate normal operation of the water heater. After cut-out, initiate a draw from the water heater at a flow rate of 1.7 gallons ± 0.25 gallons per minute (6.4 liters ± 0.95 liters per minute) for 5 minutes. Starting 15 seconds after commencement of the draw, record the outlet temperature at 15-second intervals until the end of the 5-minute period. Determine whether the maximum outlet temperature is within the range specified in section 2.4 of this appendix. If not, turn off the water heater, adjust the temperature controller, and then drain and refill the tank with supply water at the temperature specified in section 2.3 of this appendix. Then, once again, initiate normal operation of the water heater, and repeat the 5-minute outlet temperature test following cut-out. Repeat this sequence until the maximum outlet temperature during the 5-minute test is within the range specified in section 2.4 of this appendix. Once the proper temperature control setting is achieved, the setting must remain fixed for the duration of the first-hour rating test and the 24-hour simulated-use test.

5.2.2.2.2 Water Heaters with Two or More Temperature Controllers. Verify the temperature controller set-point while removing water in accordance with the procedure set forth for the first-hour rating test in section 5.3.3 of this appendix. The following criteria must be met to ensure that all temperature controllers are set to deliver water in the range specified in section 2.4 of this appendix:

(a) At least 50 percent of the water drawn during the first draw of the first-hour rating test procedure shall be delivered at a temperature within the range specified in section 2.4 of this appendix.

(b) No water is delivered above the range specified in section 2.4 of this appendix during first-hour rating test.

(c) The delivery temperature measured 15 seconds after commencement of each draw begun prior to an elapsed time of 60 minutes from the start of the test shall be within the range specified in section 2.4 of this appendix.

If these conditions are not met, turn off the water heater, adjust the temperature controllers, and then drain and refill the tank with supply water at the temperature specified in section 2.3 of this appendix. Repeat the procedure described at the start of section 5.2.2.2.2 of this appendix until the criteria for setting the temperature controllers is met.

If the conditions stated above are met, the data obtained during the process of verifying the temperature control set-points may be used in determining the first-hour rating provided that all other conditions and methods required in sections 2 and 5.2.4 of this appendix in preparing the water heater were followed.

5.2.3 Power Input Determination. For all water heaters except electric types, initiate normal operation (as described in section 5.1 of this appendix) and determine the power input, P, to the main burners (including pilot light power, if any) after 15 minutes of operation. Adjust all burners to achieve an hourly Btu (kJ) rating that is within ±2% of the maximum input rate value specified by the manufacturer. For an oil-fired water heater, adjust the burner to give a CO2 reading recommended by the manufacturer and an hourly Btu (kJ) rating that is within ±2% of the maximum input rate specified by the manufacturer. Smoke in the flue may not exceed No. 1 smoke as measured by the procedure in ASTM D2156 (R2018), including the conditions as specified in ASTM E97-1987 as referenced in ASTM D2156 (R2018). If the input rating is not within ±2%, first increase or decrease the fuel pressure within the tolerances specified in section 2.7.2, 2.7.3 or 2.7.4 (as applicable) of this appendix until it is ±2% of the maximum input rate value specified by the manufacturer. If, after adjusting the fuel pressure, the fuel input rate cannot be achieved within ±2 percent of the maximum input rate value specified by the manufacturer, for gas-fired models increase or decrease the gas supply pressure within the range specified by the manufacturer. Finally, if the measured fuel input rate is still not within ±2 percent of the maximum input rate value specified by the manufacturer, modify the gas inlet orifice, if so equipped, as necessary to achieve a fuel input rate that is within ±2 percent of the maximum input rate value specified by the manufacturer.

5.2.4 Soak-In Period for Water Heaters with Rated Storage Volumes Greater than or Equal to 2 Gallons. For water heaters with a rated storage volume greater than or equal to 2 gallons (7.6 liters), the water heater must sit filled with water, connected to a power source, and without any draws taking place for at least 12 hours after initially being energized so as to achieve the nominal temperature set-point within the tank and with the unit connected to a power source.

5.3 Delivery Capacity Tests.

5.3.1 General. For flow-activated water heaters, conduct the maximum GPM test, as described in section 5.3.2, Maximum GPM Rating Test for Flow-Activated Water Heaters, of this appendix. For all other water heaters, conduct the first-hour rating test as described in section 5.3.3 of this appendix.

5.3.2 Maximum GPM Rating Test for Flow-Activated Water Heaters. Establish normal water heater operation at the design power rating with the discharge water temperature set in accordance with section 5.2.2.1 of this appendix.

For this 10-minute test, either collect the withdrawn water for later measurement of the total mass removed or use a water meter to directly measure the water mass of volume removed. Initiate water flow through the water heater and record the inlet and outlet water temperatures beginning 15 seconds after the start of the test and at subsequent 5-second intervals throughout the duration of the test. At the end of 10 minutes, turn off the water. Determine and record the mass of water collected, M10m, in pounds (kilograms), or the volume of water, V10m, in gallons (liters).

5.3.3 First-Hour Rating Test.

5.3.3.1 General. During hot water draws for water heaters with rated storage volumes greater than or equal to 20 gallons, remove water at a rate of 3.0 ± 0.25 gallons per minute (11.4 ± 0.95 liters per minute). During hot water draws for water heaters with rated storage volumes below 20 gallons, remove water at a rate of 1.5 ± 0.25 gallon per minute (5.7 ± 0.95 liters per minute). Collect the water in a container that is large enough to hold the volume removed during an individual draw and is suitable for weighing at the termination of each draw to determine the total volume of water withdrawn. As an alternative to collecting the water, a water meter may be used to directly measure the water mass or volume withdrawn during each draw.

5.3.3.2 Draw Initiation Criteria. Begin the first-hour rating test by starting a draw on the water heater. After completion of this first draw, initiate successive draws based on the following criteria. For gas-fired and oil-fired water heaters, initiate successive draws when the temperature controller acts to reduce the supply of fuel to the main burner. For electric water heaters having a single element or multiple elements that all operate simultaneously, initiate successive draws when the temperature controller acts to reduce the electrical input supplied to the element(s). For electric water heaters having two or more elements that do not operate simultaneously, initiate successive draws when the applicable temperature controller acts to reduce the electrical input to the energized element located vertically highest in the storage tank. For heat pump water heaters that do not use supplemental, resistive heating, initiate successive draws immediately after the electrical input to the compressor is reduced by the action of the water heater's temperature controller. For heat pump water heaters that use supplemental resistive heating, initiate successive draws immediately after the electrical input to the first of either the compressor or the vertically highest resistive element is reduced by the action of the applicable water heater temperature controller. This draw initiation criterion for heat pump water heaters that use supplemental resistive heating, however, shall only apply when the water located above the thermostat at cut-out is heated to within the range specified in section 2.4 of this appendix. If this criterion is not met, then the next draw should be initiated once the heat pump compressor cuts out.

5.3.3.3 Test Sequence. Establish normal water heater operation. If the water heater is not presently operating, initiate a draw. The draw may be terminated any time after cut-in occurs. After cut-out occurs (i.e., all temperature controllers are satisfied), if the water heater can have its internal tank temperatures measured, record the internal storage tank temperature at each sensor described in section 4.5 of this appendix every one minute, and determine the mean tank temperature by averaging the values from these sensors.

Initiate a draw after a maximum mean tank temperature (the maximum of the mean temperatures of the individual sensors) has been observed following a cut-out. If the water heater cannot have its internal tank temperatures measured, wait 5 minutes after cut-out. Record the time when the draw is initiated and designate it as an elapsed time of zero (τ* = 0). (The superscript * is used to denote variables pertaining to the first-hour rating test). Record the outlet water temperature beginning 15 seconds after the draw is initiated and at 5-second intervals thereafter until the draw is terminated. Determine the maximum outlet temperature that occurs during this first draw and record it as T*max,1. For the duration of this first draw and all successive draws, in addition, monitor the inlet temperature to the water heater to ensure that the required supply water temperature test condition specified in section 2.3 of this appendix is met. Terminate the hot water draw when the outlet temperature decreases to T*max,1−15 °F (T*max,1−8.3 °C). (Note, if the outlet temperature does not decrease to T*max,1−15 °F (T*max,1−8.3 °C) during the draw, then hot water would be drawn continuously for the duration of the test. In this instance, the test would end when the temperature decreases to T*max,1−15 °F (T*max,1−8.3 °C) after the electrical power and/or fuel supplied to the water heater is shut off, as described in the following paragraphs.) Record this temperature as T*min,1. Following draw termination, determine the average outlet water temperature and the mass or volume removed during this first draw and record them as T*del,i and M*1 or V*1, respectively.

Initiate a second and, if applicable, successive draw(s) each time the applicable draw initiation criteria described in section 5.3.3.2 of this appendix are satisfied. As required for the first draw, record the outlet water temperature 15 seconds after initiating each draw and at 5-second intervals thereafter until the draw is terminated. Determine the maximum outlet temperature that occurs during each draw and record it as T*max,i, where the subscript i refers to the draw number. Terminate each hot water draw when the outlet temperature decreases to T*max,i−15 °F (T*max,i−8.3 °C). Record this temperature as T*min,i. Calculate and record the average outlet temperature and the mass or volume removed during each draw (T*del,i and M*i or V*i, respectively). Continue this sequence of draw and recovery until one hour after the start of the test, then shut off the electrical power and/or fuel supplied to the water heater.

If a draw is occurring at one hour from the start of the test, continue this draw until the outlet temperature decreases to T*max,n−15 °F (T*max,n−8.3 °C), at which time the draw shall be immediately terminated. (The subscript n shall be used to denote measurements associated with the final draw.) If a draw is not occurring one hour after the start of the test, initiate a final draw at one hour, regardless of whether the criteria described in section 5.3.3.2 of this appendix are satisfied. This draw shall proceed for a minimum of 30 seconds and shall terminate when the outlet temperature first indicates a value less than or equal to the cut-off temperature used for the previous draw (T*min,n−1). If an outlet temperature greater than T*min,n−1 is not measured within 30 seconds of initiation of the draw, zero additional credit shall be given towards first-hour rating (i.e., M*n = 0 or V*n = 0) based on the final draw. After the final draw is terminated, calculate and record the average outlet temperature and the mass or volume removed during the final draw (T*del,n and M*n or V*n, respectively).

5.4 24-Hour Simulated-Use Test.

5.4.1 Selection of Draw Pattern. The water heater will be tested under a draw profile that depends upon the first-hour rating obtained following the test prescribed in section 5.3.3 of this appendix, or the maximum GPM rating obtained following the test prescribed in section 5.3.2 of this appendix, whichever is applicable. For water heaters that have been tested according to the first-hour rating procedure, one of four different patterns shall be applied based on the measured first-hour rating, as shown in Table I of this section. For water heater that have been tested according to the maximum GPM rating procedure, one of four different patterns shall be applied based on the maximum GPM, as shown in Table II of this section.

The draw patterns are provided in Tables III.1 through III.4 in section 5.5 of this appendix. Use the appropriate draw pattern when conducting the test sequence provided in section 5.4.2 of this appendix for water heaters with rated storage volumes greater than or equal to 2 gallons or section 5.4.3 of this appendix for water heaters with rated storage volumes less than 2 gallons.

5.4.2 Test Sequence for Water Heater With Rated Storage Volume Greater Than or Equal to 2 Gallons.

If the water heater is turned off, fill the water heater with supply water at the temperature specified in section 2.3 of this appendix and maintain supply water pressure as described in section 2.6 of this appendix. Turn on the water heater and associated heat pump unit, if present. If turned on in this fashion, the soak-in period described in section 5.2.4 of this appendix shall be implemented. If the water heater has undergone a first-hour rating test prior to conduct of the 24-hour simulated-use test, allow the water heater to fully recover after completion of that test such that the main burner, heating elements, or heat pump compressor of the water heater are no longer raising the temperature of the stored water. In all cases, the water heater shall sit idle for 1 hour prior to the start of the 24-hour test; during which time no water is drawn from the unit, and there is no energy input to the main heating elements, heat pump compressor, and/or burners.

For water heaters that can have their internal storage tank temperature measured directly, perform testing in accordance with the instructions in section 5.4.2.1 of this appendix. For water heaters that cannot have their internal tank temperatures measured, perform testing in accordance with the instructions in section 5.4.2.2. of this appendix.

5.4.2.1 Water Heaters Which Can Have Internal Storage Tank Temperature Measured Directly.

After the 1-hour period specified in section 5.4.2 of this appendix, the 24-hour simulated-use test will begin. One minute prior to the start of the 24-hour simulated-use test, record the mean tank temperature (T0).

At the start of the 24-hour simulated-use test, record the electrical and/or fuel measurement readings, as appropriate. Begin the 24-hour simulated-use test by withdrawing the volume specified in the appropriate table in section 5.5 of this appendix (i.e., Table III.1, Table III.2, Table III.3, or Table III.4, depending on the first-hour rating or maximum GPM rating) for the first draw at the flow rate specified in the applicable table. Record the time when this first draw is initiated and assign it as the test elapsed time (τ) of zero (0). Record the average storage tank and ambient temperature every minute throughout the 24-hour simulated-use test. At the elapsed times specified in the applicable draw pattern table in section 5.5 of this appendix for a particular draw pattern, initiate additional draws pursuant to the draw pattern, removing the volume of hot water at the prescribed flow rate specified by the table. The maximum allowable deviation from the specified volume of water removed for any single draw taken at a nominal flow rate of 1.0 GPM or 1.7 GPM is ±0.1 gallons (±0.4 liters). The maximum allowable deviation from the specified volume of water removed for any single draw taken at a nominal flow rate of 3.0 GPM is ±0.25 gallons (0.9 liters). The quantity of water withdrawn during the last draw shall be increased or decreased as necessary such that the total volume of water withdrawn equals the prescribed daily amount for that draw pattern ±1.0 gallon (±3.8 liters). If this adjustment to the volume drawn during the last draw results in no draw taking place, the test is considered invalid.

All draws during the 24-hour simulated-use test shall be made at the flow rates specified in the applicable draw pattern table in section 5.5 of this appendix, within a tolerance of ±0.25 gallons per minute (±0.9 liters per minute). Measurements of the inlet and outlet temperatures shall be made 15 seconds after the draw is initiated and at every subsequent 3-second interval throughout the duration of each draw. Calculate and record the mean of the hot water discharge temperature and the cold water inlet temperature for each draw Tdel,i and Tin,i). Determine and record the net mass or volume removed (Mi or Vi), as appropriate, after each draw.

The first recovery period is the time from the start of the 24-hour simulated-use test and continues during the temperature rise of the stored water until the first cut-out; if the cut-out occurs during a subsequent draw, the first recovery period includes the time until the draw of water from the tank stops. If, after the first cut-out occurs but during a subsequent draw, a subsequent cut-in occurs prior to the draw completion, the first recovery period includes the time until the subsequent cut-out occurs, prior to another draw. The first recovery period may continue until a cut-out occurs when water is not being removed from the water heater or a cut-out occurs during a draw and the water heater does not cut-in prior to the end of the draw.

At the end of the first recovery period, record the maximum mean tank temperature observed after cut-out (Tmax,1). At the end of the first recovery period, record the total energy consumed by the water heater from the beginning of the test (Qr), including all fossil fuel and/or electrical energy use, from the main heat source and auxiliary equipment including, but not limited to, burner(s), resistive elements(s), compressor, fan, controls, pump, etc., as applicable.

The start of the portion of the test during which the standby loss coefficient is determined depends upon whether the unit has fully recovered from the first draw cluster. If a recovery is occurring at or within five minutes after the end of the final draw in the first draw cluster, as identified in the applicable draw pattern table in section 5.5 of this appendix, then the standby period starts when a maximum mean tank temperature is observed starting five minutes after the end of the recovery period that follows that draw. If a recovery does not occur at or within five minutes after the end of the final draw in the first draw cluster, as identified in the applicable draw pattern table in section 5.5 of this appendix, then the standby period starts five minutes after the end of that draw. Determine and record the total electrical energy and/or fossil fuel consumed from the beginning of the test to the start of the standby period (Qsu,0).

In preparation for determining the energy consumed during standby, record the reading given on the electrical energy (watt-hour) meter, the gas meter, and/or the scale used to determine oil consumption, as appropriate. Record the mean tank temperature at the start of the standby period (Tsu,0). At 1-minute intervals, record ambient temperature, the electric and/or fuel instrument readings, and the mean tank temperature until the next draw is initiated. The end of the standby period is when the final mean tank temperature is recorded, as described. Just prior to initiation of the next draw, record the mean tank temperature (Tsu,f). If the water heater is undergoing recovery when the next draw is initiated, record the mean tank temperature (Tsu,f) at the minute prior to the start of the recovery. Determine the total electrical energy and/or fossil fuel energy consumption from the beginning of the test to the end of the standby period (Qsu,f). Record the time interval between the start of the standby period and the end of the standby period (τstby,1).

Following the final draw of the prescribed draw pattern and subsequent recovery, allow the water heater to remain in the standby mode until exactly 24 hours have elapsed since the start of the 24-hour simulated-use test (i.e., since τ = 0). During the last hour of the 24-hour simulated-use test (i.e., hour 23 of the 24-hour simulated-use test), power to the main burner, heating element, or compressor shall be disabled. At 24 hours, record the reading given by the gas meter, oil meter, and/or the electrical energy meter as appropriate. Determine the fossil fuel and/or electrical energy consumed during the entire 24-hour simulated-use test and designate the quantity as Q.

In the event that the recovery period continues from the end of the last draw of the first draw cluster until the subsequent draw, the standby period will start after the end of the first recovery period after the last draw of the 24-hour simulated-use test, when the temperature reaches the maximum mean tank temperature, though no sooner than five minutes after the end of this recovery period. The standby period shall last eight hours, so testing may extend beyond the 24-hour duration of the 24-hour simulated-use test. Determine and record the total electrical energy and/or fossil fuel consumed from the beginning of the 24-hour simulated-use test to the start of the 8-hour standby period (Qsu,0). In preparation for determining the energy consumed during standby, record the reading(s) given on the electrical energy (watt-hour) meter, the gas meter, and/or the scale used to determine oil consumption, as appropriate. Record the mean tank temperature at the start of the standby period (Tsu,0). Record the mean tank temperature, the ambient temperature, and the electric and/or fuel instrument readings at 1-minute intervals until the end of the 8-hour period. Record the mean tank temperature at the end of the 8-hour standby period (Tsu,f). If the water heater is undergoing recovery at the end of the standby period, record the mean tank temperature (Tsu,f) at the minute prior to the start of the recovery, which will mark the end of the standby period. Determine the total electrical energy and/or fossil fuel energy consumption from the beginning of the test to the end of the standby period (Qsu,f). Record the time interval between the start of the standby period and the end of the standby period as τstby,1. Record the average ambient temperature from the start of the standby period to the end of the standby period (Ta,stby,1). Record the average mean tank temperature from the start of the standby period to the end of the standby period (Tt,stby,1).

If the standby period occurred at the end of the first recovery period after the last draw of the 24-hour simulated-use test, allow the water heater to remain in the standby mode until exactly 24 hours have elapsed since the start of the 24-hour simulated-use test (i.e., since τ = 0) or the end of the standby period, whichever is longer. At 24 hours, record the mean tank temperature (T24) and the reading given by the gas meter, oil meter, and/or the electrical energy meter as appropriate. If the water heater is undergoing a recovery at 24 hours, record the reading given by the gas meter, oil meter, and/or electrical energy meter, as appropriate, and the mean tank temperature (T24) at the minute prior to the start of the recovery. Determine the fossil fuel and/or electrical energy consumed during the 24 hours and designate the quantity as Q.

Record the time during which water is not being withdrawn from the water heater during the entire 24-hour period (τstby,2). When the standby period occurs after the last draw of the 24-hour simulated-use test, the test may extend past hour 24. When this occurs, the measurements taken after hour 24 apply only to the calculations of the standby loss coefficient. All other measurements during the time between hour 23 and hour 24 remain the same.

5.4.2.2 Water Heaters Which Cannot Have Internal Storage Tank Temperature Measured Directly.

After the water heater has undergone a 1-hour idle period (as described in section 5.4.2 of this appendix), deactivate the burner, compressor, or heating element(s).

Remove water from the storage tank by performing a continuous draw at the flow rate specified for the first draw of applicable draw pattern for the 24-hour simulated use test in section 5.5 of this appendix within a tolerance of ±0.25 gallons per minute (±0.9 liters per minute). While removing the hot water, measure the inlet and outlet temperature after initiating the draw at 3-second intervals. Remove water until the outlet water temperature is within ±2 °F (±1.1 °C) of the inlet water temperature for 15 consecutive seconds. Determine the mean tank temperature using section 6.3.77 of this appendix and assign this value of Tst for T0, Tmax,1, and Tsu,0.

After completing the draw, reactivate the burner, compressor, or heating elements(s) and allow the unit to fully recover such that the main burner, heating elements, or heat pump compressor is no longer raising the temperature of the stored water. Let the water heater sit idle again for 1 hour prior to beginning the 24-hour test, during which time no water shall be drawn from the unit, and there shall be no energy input to the main heating elements. After the 1-hour period, the 24-hour simulated-use test will begin.

At the start of the 24-hour simulated-use test, record the electrical and/or fuel measurement readings, as appropriate. Begin the 24-hour simulated-use test by withdrawing the volume specified in the appropriate table in section 5.5 of this appendix (i.e., Table III.1, Table III.2, Table III.3, or Table III.4, depending on the first-hour rating or maximum GPM rating) for the first draw at the flow rate specified in the applicable table. Record the time when this first draw is initiated and assign it as the test elapsed time (τ) of zero (0). Record the average ambient temperature every minute throughout the 24-hour simulated-use test. At the elapsed times specified in the applicable draw pattern table in section 5.5 of this appendix for a particular draw pattern, initiate additional draws pursuant to the draw pattern, removing the volume of hot water at the prescribed flow rate specified by the table. The maximum allowable deviation from the specified volume of water removed for any single draw taken at a nominal flow rate of 1.0 GPM or 1.7 GPM is ± 0.1 gallons (± 0.4 liters). The maximum allowable deviation from the specified volume of water removed for any single draw taken at a nominal flow rate of 3.0 GPM is ± 0.25 gallons (0.9 liters). The quantity of water withdrawn during the last draw shall be increased or decreased as necessary such that the total volume of water withdrawn equals the prescribed daily amount for that draw pattern ± 1.0 gallon (± 3.8 liters). If this adjustment to the volume drawn during the last draw results in no draw taking place, the test is considered invalid.

All draws during the 24-hour simulated-use test shall be made at the flow rates specified in the applicable draw pattern table in section 5.5 of this appendix, within a tolerance of ±0.25 gallons per minute (±0.9 liters per minute). Measurements of the inlet and outlet temperatures shall be made 15 seconds after the draw is initiated and at every subsequent 3-second interval throughout the duration of each draw. Calculate and record the mean of the hot water discharge temperature and the cold water inlet temperature for each draw Tdel,i and Tin,i). Determine and record the net mass or volume removed (Mi or Vi), as appropriate, after each draw.

The first recovery period is the time from the start of the 24-hour simulated-use test and continues until the first cut-out; if the cut-out occurs during a subsequent draw, the first recovery period includes the time until the draw of water from the tank stops. If, after the first cut-out occurs but during a subsequent draw, a subsequent cut-in occurs prior to the draw completion, the first recovery period includes the time until the subsequent cut-out occurs, prior to another draw. The first recovery period may continue until a cut-out occurs when water is not being removed from the water heater or a cut-out occurs during a draw and the water heater does not cut-in prior to the end of the draw.

At the end of the first recovery period, record the total energy consumed by the water heater from the beginning of the test (Qr), including all fossil fuel and/or electrical energy use, from the main heat source and auxiliary equipment including, but not limited to, burner(s), resistive elements(s), compressor, fan, controls, pump, etc., as applicable.

The standby period begins at five minutes after the first time a recovery ends following last draw of the simulated-use test and shall continue for 8 hours. At the end of the 8-hour standby period, record the total amount of time elapsed since the start of the 24-hour simulated-use test (i.e., since τ = 0).

Determine and record the total electrical energy and/or fossil fuel consumed from the beginning of the 24-hour simulated-use test to the start of the 8-hour standby period (Qsu,0). In preparation for determining the energy consumed during standby, record the reading(s) given on the electrical energy (watt-hour) meter, the gas meter, and/or the scale used to determine oil consumption, as appropriate. Record the ambient temperature and the electric and/or fuel instrument readings at 1-minute intervals until the end of the 8-hour period. At the 8-hour mark, deactivate the water heater before drawing water from the tank. Remove water from the storage tank by performing a continuous draw atthe flow rate specified for the first draw of applicable draw pattern for the 24-hour simulated use test in section 5.5 of this appendix within a tolerance of ±0.25 gallons per minute (±0.9 liters per minute). While removing the hot water, measure the inlet and outlet temperature after initiating the draw at 3-second intervals. Remove water until the outlet water temperature is within ±2 °F (±1.1 °C) of the inlet water temperature for 15 consecutive seconds. Determine the mean tank temperature using section 6.3.77 of this appendix and assign this value of Tst for Tsu,f and T24.

Determine the total electrical energy and/or fossil fuel energy consumption from the beginning of the test to the end of the standby period (Qsu,f). Record the time interval between the start of the standby period and the end of the standby period as τstby,1. Record the average ambient temperature from the start of the standby period to the end of the standby period (Ta,stby,1). The average mean tank temperature from the start of the standby period to the end of the standby period (Tt,stby,1) shall be the average of Tsu,0 and Tsu,f.

5.4.3 Test Sequence for Water Heaters With Rated Storage Volume Less Than 2 Gallons.

Establish normal operation with the discharge water temperature at 125 °F ± 5 °F (51.7 °C ± 2.8 °C) and set the flow rate as determined in section 5.2 of this appendix. Prior to commencement of the 24-hour simulated-use test, the unit shall remain in an idle state in which controls are active but no water is drawn through the unit for a period of one hour. With no draw occurring, record the reading given by the gas meter and/or the electrical energy meter as appropriate. Begin the 24-hour simulated-use test by withdrawing the volume specified in Tables III.1 through III.4 of section 5.5 of this appendix for the first draw at the flow rate specified. Record the time when this first draw is initiated and designate it as an elapsed time, τ, of 0. At the elapsed times specified in Tables III.1 through III.4 for a particular draw pattern, initiate additional draws, removing the volume of hot water at the prescribed flow rate specified in Tables III.1 through III.4. The maximum allowable deviation from the specified volume of water removed for any single draw taken at a nominal flow rate less than or equal to 1.7 GPM (6.4 L/min) is ±0.1 gallons (±0.4 liters). The maximum allowable deviation from the specified volume of water removed for any single draw taken at a nominal flow rate of 3.0 GPM (11.4 L/min) is ±0.25 gallons (0.9 liters). The quantity of water drawn during the final draw shall be increased or decreased as necessary such that the total volume of water withdrawn equals the prescribed daily amount for that draw pattern ±1.0 gallon (±3.8 liters). If this adjustment to the volume drawn in the last draw results in no draw taking place, the test is considered invalid.

All draws during the 24-hour simulated-use test shall be made at the flow rates specified in the applicable draw pattern table in section 5.5 of this appendix within a tolerance of ±0.25 gallons per minute (±0.9 liters per minute) unless the unit being tested is flow-activated and has a rated Max GPM of less than 1 gallon per minute, in which case the tolerance shall be ±25% of the rated Max GPM. Measurements of the inlet and outlet water temperatures shall be made 15 seconds after the draw is initiated and at every 3-second interval thereafter throughout the duration of the draw. Calculate the mean of the hot water discharge temperature and the cold-water inlet temperature for each draw. Record the mass of the withdrawn water or the water meter reading, as appropriate, after each draw. At the end of the first recovery period following the first draw, determine and record the fossil fuel and/or electrical energy consumed, Qr. Following the final draw and subsequent recovery, allow the water heater to remain in the standby mode until exactly 24 hours have elapsed since the start of the test (i.e., since τ = 0). At 24 hours, record the reading given by the gas meter, oil meter, and/or the electrical energy meter, as appropriate. Determine the fossil fuel and/or electrical energy consumed during the entire 24-hour simulated-use test and designate the quantity as Q.

5.5 Draw Patterns.

The draw patterns to be imposed during 24-hour simulated-use tests are provided in Tables III.1 through III.4. Subject each water heater under test to one of these draw patterns based on its first-hour rating or maximum GPM rating, as discussed in section 5.4.1 of this appendix. Each draw pattern specifies the elapsed time in hours and minutes during the 24-hour test when a draw is to commence, the total volume of water in gallons (liters) that is to be removed during each draw, and the flow rate at which each draw is to be taken, in gallons (liters) per minute.

5.6 Optional Tests (Heat Pump-Type Water Heaters). Optional testing may be conducted on heat pump-type water heaters to determine EX. If optional testing is performed, conduct the additional 24-hour simulated use test(s) at one or multiple of the test conditions specified in section 2.8 of this appendix. Prior to conducting a 24-hour simulated use test at an optional condition, confirm the air and water conditions specified in section 2.8 are met and re-set the outlet discharge temperature in accordance with section 5.2.2 of this appendix. Perform the optional 24-hour simulated use test(s) in accordance with section 5.4 of this appendix using the same draw pattern used for the determination of UEF.

6. Computations.

6.1 First-Hour Rating Computation. For the case in which the final draw is initiated at or prior to one hour from the start of the test, the first-hour rating, Fhr, shall be computed using,

Where: n = the number of draws that are completed during the first-hour rating test. V*del,i = the volume of water removed during the ith draw of the first-hour rating test, gal (L) or, if the mass of water removed is being measured, Where: M*del,i = the mass of water removed during the ith draw of the first-hour rating test, lb (kg). ρdel,i = the density of water removed, evaluated at the average outlet water temperature measured during the ith draw of the first-hour rating test, (T*del,i), lb/gal (kg/L). or, if the volume of the water entering the water heater is being measured, Where: V*in,i = the volume of water entering the water heater during the ith draw of the first-hour rating test, gal (L). ρin,i = the density of water entering the water heater, evaluated at the average inlet water temperature measured during the ith draw of the first-hour rating test, (T*in,i), lb/gal (kg/L). or, if the mass of water entering the water heater is being measured, Where: M*in,i = the mass of water entering the water heater during the ith draw of the first-hour rating test, lb (kg).

For the case in which a draw is not in progress at one hour from the start of the test and a final draw is imposed at the elapsed time of one hour, the first-hour rating shall be calculated using,

where n and V*del,i are the same quantities as defined above, and V*del,n = the volume of water removed during the nth (final) draw of the first-hour rating test, gal (L). T*del,n−1 = the average water outlet temperature measured during the (n−1)th draw of the first-hour rating test, °F ( °C). T*del,n = the average water outlet temperature measured during the nth (final) draw of the first-hour rating test, °F ( °C). T*min,n−1 = the minimum water outlet temperature measured during the (n−1)th draw of the first-hour rating test, °F ( °C).

6.2 Maximum GPM (L/min) Rating Computation. Compute the maximum GPM (L/min) rating, Fmax, as:

Where: Vdel,10m = the volume of water removed during the maximum GPM (L/min) rating test, gal (L). Tdel = the average delivery temperature, °F ( °C). Tin = the average inlet temperature, °F ( °C). 10 = the number of minutes in the maximum GPM (L/min) rating test, min. or, if the mass of water removed is measured, Where: Mdel,10m = the mass of water removed during the maximum GPM (L/min) rating test, lb (kg). ρdel = the density of water removed, evaluated at the average delivery water temperature of the maximum GPM (L/min) rating test (Tdel), lb/gal (kg/L). or, if the volume of water entering the water heater is measured, Where: Vin,10m = the volume of water entering the water heater during the maximum GPM (L/min) rating test, gal (L). ρin = the density of water entering the water heater, evaluated at the average inlet water temperature of the maximum GPM (L/min) rating test (Tdel), lb/gal (kg/L). or, if the mass of water entering the water heater is measured, Where: Min,10m = the mass of water entering the water heater during the maximum GPM (L/min) rating test, lb (kg).

6.3 Computations for Water Heaters with a Rated Storage Volume Greater Than or Equal to 2 Gallons and Circulating Water Heaters.

6.3.1 Storage Tank Capacity. The storage tank capacity, Vst, is computed as follows:

Where: Vst = the storage capacity of the water heater, or, for circulating water heaters, the storage capacity of the separate storage tank used in accordance with section 4.10, gal (L). Wf = the weight of the storage tank when completely filled with water, lb (kg). Wt = the (tare) weight of the storage tank when completely empty, lb (kg). ρ = the density of water used to fill the tank measured at the temperature of the water, lb/gal (kg/L).

6.3.1.1 Effective Storage Volume. The effective storage tank capacity, Veff, is computed as follows:

For water heaters requiring a separate storage tank, Veff is the storage tank capacity of the separate storage tank as determined per section 6.3.1.

For all other water heaters:

Veff = kVVst

Where: Vst = as defined in section 6.3.1 and kV = a dimensionless volume scaling factor determined as follows:

If the first recovery period extends into the second draw of the 24-hour simulated use test, and

If T0 > (Tdel,1 + 5 °F) and T0 ≥ 130 °F,

(if T0 > (Tdel,1 + 2.8 °C) and T0 ≥ 54.4 °C),

If the first recovery period does not extend into the second draw of the 24-hour simulated use test, and

If Tmax,1 > (Tdel,2 + 5 °F) and Tmax,1 ≥ 130 °F,

(if Tmax,1 > (Tdel,2 + 2.8 °C) and Tmax,1 ≥ 54.4 °C),

Otherwise, kV = 1.

Where: T0= the mean tank temperature at the beginning of the 24-hour simulated-use test, °F( °C). Tdel,1= the average outlet water temperature during the first draw of the 24-hour simulated-use test, °F( °C). ρ(T0) = the density of the stored hot water evaluated at the mean tank temperature at the beginning of the 24-hour simulated-use test (T0), lb/gal (kg/L). Cp(T0) = the specific heat of the stored hot water, evaluated at T0, Btu/(lb· °F) (kJ/(kg· °C)). Tmax,1 = the maximum measured mean tank temperature after cut-out following the first draw of the 24-hour simulated-use test, °F( °C). Tdel,2= the average outlet water temperature during the second draw of the 24-hour simulated-use test, °F( °C). ρ(Tmax,1) = the density of the stored hot water evaluated at the maximum measured mean tank temperature after cut-out following the first draw of the 24-hour simulated-use test (Tmax,1), lb/gal (kg/L). Cp(Tmax,1) = the specific heat of the stored hot water, evaluated at Tmax,1, Btu/(lb· °F) (kJ/(kg· °C)). ρ(125 °F) = the density of the stored hot water at 125 °F, lb/gal (kg/L). Cp(125 °F) = the specific heat of the stored hot water at 125 °F, Btu/(lb· °F) (kJ/(kg· °C)). 125 °F (51.7 °C) = the nominal maximum mean tank temperature for a storage tank that does not utilize a mixing valve to achieve a 125 °F delivery temperature.

67.5 °F (19.7 °C) = the nominal average ambient air temperature.

6.3.2 Mass of Water Removed. Determine the mass of water removed during each draw of the 24-hour simulated-use test (Mdel,i) as:

If the mass of water removed is measured, use the measured value, or, if the volume of water removed is being measured,

Mdel,i = Vdel,i * Pdel,i

Where: Vdel,i = volume of water removed during the ith draw of the 24-hour simulated-use test, gal (L). ρdel,i = density of the water removed, evaluated at the average outlet water temperature measured during the ith draw of the 24-hour simulated-use test, (Tdel,i), lb/gal (kg/L). or, if the volume of water entering the water heater is measured,

Mdel,i = Vin,i * ρin,i

Where: Vin,i = volume of water entering the water heater during draw ith draw of the 24-hour simulated-use test, gal (L). ρin,i = density of the water entering the water heater, evaluated at the average inlet water temperature measured during the ith draw of the 24-hour simulated-use test, (Tin,i), lb/gal (kg/L). or, if the mass of water entering the water heater is measured,

Mdel,i = Min,i

Where: Min,i = mass of water entering the water heater during draw ith draw of the 24-hour simulated-use test, lb (kg).

6.3.3 Recovery Efficiency. The recovery efficiency for gas, oil, and heat pump water heaters with a rated storage volume greater than or equal to 2 gallons, ηr, is computed as:

Where: Vst = as defined in section 6.3.1 of this appendix. ρ1 = density of stored hot water evaluated at (Tmax,1 + T0)/2, lb/gal (kg/L). Cp1 = specific heat of the stored hot water, evaluated at (Tmax,1 + T0)/2, Btu/(lb· °F) (kJ/(kg· °C). Tmax,1 = maximum mean tank temperature recorded after the first recovery period as defined in section 5.4.2 of this appendix, °F ( °C). T0 = mean tank temperature recorded at the beginning of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix, °F ( °C). Qr = the total energy used by the water heater during the first recovery period as defined in section 5.4.2 of this appendix, including auxiliary energy such as pilot lights, pumps, fans, etc., Btu (kJ). (Electrical auxiliary energy shall be converted to thermal energy using the following conversion: 1 kWh = 3412 Btu). Nr = number of draws from the start of the 24-hour simulated-use test to the end to the first recovery period as described in section 5.4.2. Mdel,i = mass of water removed as calculated in section 6.3.2 of this appendix during the ith draw of the first recovery period as described in section 5.4.2, lb (kg). Cpi = specific heat of the withdrawn water during the ith draw of the first recovery period as described in section 5.4.2, evaluated at (Tdel,i + Tin,i)/2, Btu/(lb· °F) (kJ/(kg· °C)). Tdel,i = average water outlet temperature measured during the ith draw of the first recovery period as described in section 5.4.2, °F ( °C). Tin,i = average water inlet temperature measured during the ith draw of the first recovery period as described in section 5.4.2, °F ( °C).

The recovery efficiency for electric water heaters with immersed heating elements, not including heat pump water heaters with immersed heating elements, is assumed to be 98 percent.

6.3.4 Hourly Standby Losses. The energy consumed as part of the standby loss test of the 24-hour simulated-use test, Qstby, is computed as:

Qstby = Qsu,f − Qsu,o Where: Qsu,0 = cumulative energy consumption, including all fossil fuel and electrical energy use, of the water heater from the start of the 24-hour simulated-use test to the start of the standby period as determined in section 5.4.2 of this appendix, Btu (kJ). Qsu,f = cumulative energy consumption, including all fossil fuel and electrical energy use, of the water heater from the start of the 24-hour simulated-use test to the end of the standby period as determined in section 5.4.2 of this appendix, Btu (kJ).

The hourly standby energy losses are computed as:

Where: Qhr = the hourly standby energy losses of the water heater, Btu/h (kJ/h). Vst = as defined in section 6.3.1 of this appendix. ρ = density of the stored hot water, evaluated at (Tsu,f + Tsu,0)/2, lb/gal (kg/L). Cp = specific heat of the stored water, evaluated at (Tsu,f + Tsu,0)/2, Btu/(lb· °F), (kJ/(kg·K)). Tsu,f = the mean tank temperature measured at the end of the standby period as determined in section 5.4.2 of this appendix, °F ( °C). Tsu,0 = the maximum mean tank temperature measured at the beginning of the standby period as determined in section 5.4.2 of this appendix, °F ( °C). ηr = as defined in section 6.3.3 of this appendix. τstby,1 = elapsed time between the start and end of the standby period as determined in section 5.4.2 of this appendix, h.

The standby heat loss coefficient for the tank is computed as:

Where: UA = standby heat loss coefficient of the storage tank, Btu/(h· °F), (kJ/(h· °C). Tt,stby,1 = overall average mean tank temperature between the start and end of the standby period as determined in section 5.4.2 of this appendix, °F ( °C). Ta,stby,1 = overall average ambient temperature between the start and end of the standby period as determined in section 5.4.2 of this appendix, °F ( °C). 6.3.5 Daily Water Heating Energy Consumption. The total energy used by the water heater during the 24-hour simulated-use test (Q) is as measured in section 5.4.2 of this appendix, or, Q = Qf + Qe = total energy used by the water heater during the 24-hour simulated-use test, including auxiliary energy such as pilot lights, pumps, fans, etc., Btu (kJ). Qf = total fossil fuel energy used by the water heater during the 24-hour simulated-use test, Btu (kJ). Qe = total electrical energy used during the 24-hour simulated-use test, Btu (kJ). (Electrical energy shall be converted to thermal energy using the following conversion: 1kWh = 3412 Btu.)

The daily water heating energy consumption, Qd, is computed as:

Where: Vst = as defined in section 6.3.1 of this appendix. ρ = density of the stored hot water, evaluated at (T24 + T0)/2, lb/gal (kg/L). Cp = specific heat of the stored water, evaluated at (T24 + T0)/2, Btu/(lb· °F), (kJ/(kg·K)). T24 = mean tank temperature at the end of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix, °F ( °C). T0 = mean tank temperature recorded at the beginning of the 24-hour simulated-use test as determined in section 5.4.2 of this appendix, °F ( °C). ηr = as defined in section 6.3.3 of this appendix. 6.3.6 Adjusted Daily Water Heating Energy Consumption. The adjusted daily water heating energy consumption, Qda, takes into account that the ambient temperature may differ from the nominal value of 67.5 °F (19.7 °C) due to the allowable variation in surrounding ambient temperature of 65 °F (18.3 °C) to 70 °C (21.1 °C). The adjusted daily water heating energy consumption is computed as: Qda = Qd − (67.5 °C − Ta,stby,2) UA τstby,2 or, Qda = Qd − (19.7 °C − Ta,stby,2) UA τstby,2 Where: Qda = the adjusted daily water heating energy consumption, Btu (kJ). Qd = as defined in section 6.3.4 of this appendix. Ta,stby,2 = the average ambient temperature during the total standby portion, τstby,2, of the 24-hour simulated-use test, °F ( °C). UA = as defined in section 6.3.4 of this appendix. τstby,2 = the number of hours during the 24-hour simulated-use test when water is not being withdrawn from the water heater.

A modification is also needed to take into account that the temperature difference between the outlet water temperature and supply water temperature may not be equivalent to the nominal value of 67 °F (125 °F-58 °F) or 37.3 °C (51.7 °C-14.4 °C). The following equations adjust the experimental data to a nominal 67 °F (37.3 °C) temperature rise.

The energy used to heat water, Btu/day (kJ/day), may be computed as:

Where: N = total number of draws in the 24-hour simulated-use test. Mdel,i = the mass of water removed during the ith draw (i = 1 to N) as calculated in section 6.3.2 of this appendix, lb (kg). Cpi = the specific heat of the water withdrawn during the ith draw of the 24-hour simulated-use test, evaluated at (Tdel,i + Tin,i)/2, Btu/(lb· °F) (kJ/(kg· °C)). Tdel,i = the average water outlet temperature measured during the ith draw (i = 1 to N), °F ( °C). Tin,i = the average water inlet temperature measured during the ith draw (i = 1 to N), °F ( °C). ηr = as defined in section 6.3.3 of this appendix.

The energy required to heat the same quantity of water over a 67 °F (37.3 °C) temperature rise, Btu/day (kJ/day), is:

or, The difference between these two values is: QHWD = QHW,67. °F − QHW or, QHWD = QHW,37.3 °C − QHW

This difference (QHWD) must be added to the adjusted daily water heating energy consumption value. Thus, the daily energy consumption value, which takes into account that the ambient temperature may not be 67.5 °F (19.7 °C) and that the temperature rise across the storage tank may not be 67 °F (37.3 °C) is:

Qdm = Qda − QHWD

6.3.7 Estimated Mean Tank Temperature for Water Heaters with Rated Storage Volumes Greater Than or Equal to 2 Gallons. If testing is conducted in accordance with section 5.4.2.2 of this appendix, calculate the mean tank temperature immediately prior to the internal tank temperature determination draw using the following equation:

Where: Tst = the estimated average internal storage tank temperature, °F ( °C). Tp = the average of the inlet and the outlet water temperatures at the end of the period defined by τp, °F ( °C). vout,p = the average flow rate during the period, gal/min (L/min). Vst = the rated storage volume of the water heater, gal (L). τp = the number of minutes in the duration of the period, determined by the length of time taken for the outlet water temperature to be within 2 °F of the inlet water temperature for 15 consecutive seconds and including the 15-second stabilization period. Tin,p = the average of the inlet water temperatures during the period, °F ( °C). Tout,p = the average of the outlet water temperatures during the period, °F ( °C).

6.3.8 Uniform Energy Factor. The uniform energy factor, UEF, is computed as:

Where: N = total number of draws in the 24-hour simulated-use test. Qdm = the modified daily water heating energy consumption as computed in accordance with section 6.3.6 of this appendix, Btu (kJ). Mdel,i = the mass of water removed during the ith draw (i = 1 to N) as calculated in section 6.3.2 of this appendix, lb (kg). Cpi = the specific heat of the water withdrawn during the ith draw of the 24-hour simulated-use test, evaluated at (125 °F + 58 °F)/2 = 91.5 °F ((51.7 °C + 14.4 °C)/2 = 33 °C), Btu/(lb· °F) (kJ/(kg· °C)).

6.3.9 Annual Energy Consumption. The annual energy consumption for water heaters with rated storage volumes greater than or equal to 2 gallons is computed as:

Where: UEF = the uniform energy factor as computed in accordance with section 6.3.88 of this appendix. 365 = the number of days in a year. V = the volume of hot water drawn during the applicable draw pattern, gallons. = 10 for the very-small-usage draw pattern. = 38 for the low-usage draw pattern. = 55 for the medium-usage draw pattern. = 84 for high-usage draw pattern. ρ = 8.24 lb/gallon, the density of water at 125 °F. Cp = 1.00 Btu/(lb °F), the specific heat of water at 91.5 °F. 67 = the nominal temperature difference between inlet and outlet water

6.3.10 Annual Electrical Energy Consumption. The annual electrical energy consumption in kilowatt-hours for water heaters with rated storage volumes greater than or equal to 2 gallons, Eannual,e, is computed as:

Where: Eannual = the annual energy consumption as determined in accordance with section 6.3.99 of this appendix, Btu (kJ). Qe = the daily electrical energy consumption as defined in section 6.3.5 of this appendix, Btu (kJ). Q = total energy used by the water heater during the 24-hour simulated-use test in accordance with section 6.3.5 of this appendix, Btu (kJ). 3412 = conversion factor from Btu to kWh.

6.3.11 Annual Fossil Fuel Energy Consumption. The annual fossil fuel energy consumption for water heaters with rated storage volumes greater than or equal to 2 gallons, Eannual,f, is computed as:

Eannual,f = Eannual−(Eannual,e * 3412) Where: Eannual = the annual energy consumption as determined in accordance with section 6.3.9 of this appendix, Btu (kJ). Eannual,e = the annual electrical energy consumption as determined in accordance with section 6.3.10 of this appendix, kWh. 3412 = conversion factor from kWh to Btu.

6.4 Computations for Water Heaters with a Rated Storage Volume Less Than 2 Gallons.

6.4.1 Mass of Water Removed

Calculate the mass of water removed using the calculations in section 6.3.2 of this appendix.

6.4.2 Recovery Efficiency. The recovery efficiency, ηr, is computed as:

Where: M1 = mass of water removed during the first draw of the 24-hour simulated-use test, lb (kg). Cp1 = specific heat of the withdrawn water during the first draw of the 24-hour simulated-use test, evaluated at (Tdel,1 + Tin,1)/2, Btu/(lb· °F) (kJ/(kg· °C)). Tdel,1 = average water outlet temperature measured during the first draw of the 24-hour simulated-use test, °F ( °C). Tin,1 = average water inlet temperature measured during the first draw of the 24-hour simulated-use test, °F ( °C). Qr = the total energy used by the water heater during the first recovery period as defined in section 5.4.3 of this appendix, including auxiliary energy such as pilot lights, pumps, fans, etc., Btu (kJ). (Electrical auxiliary energy shall be converted to thermal energy using the following conversion: 1 kWh = 3412 Btu.)

6.4.3 Daily Water Heating Energy Consumption. The daily water heating energy consumption, Qd, is computed as:

Qd = Q Where: Q = Qf + Qe = the energy used by the water heater during the 24-hour simulated-use test. Qf = total fossil fuel energy used by the water heater during the 24-hour simulated-use test, Btu (kJ). Qe = total electrical energy used during the 24-hour simulated-use test, Btu (kJ). (Electrical auxiliary energy shall be converted to thermal energy using the following conversion: 1 kWh = 3412 Btu.)

A modification is needed to take into account that the temperature difference between the outlet water temperature and supply water temperature may not be equivalent to the nominal value of 67 °F (125 °F−58 °F) or 37.3 °C (51.7 °C−14.4 °C). The following equations adjust the experimental data to a nominal 67 °F (37.3 °C) temperature rise.

The energy used to heat water may be computed as:

Where: N = total number of draws in the 24-hour simulated-use test. Mdel,i = the mass of water removed during the ith draw (i = 1 to N) as calculated in section 6.4.1 of this appendix, lb (kg). Cpi = the specific heat of the water withdrawn during the ith draw of the 24-hour simulated-use test, evaluated at (Tdel,i + Tin,i)/2, Btu/(lb· °F) (kJ/(kg· °C)). Tdel,i = the average water outlet temperature measured during the ith draw (i = 1 to N), °F ( °C). Tin,i = the average water inlet temperature measured during the ith draw (i = 1 to N), °F ( °C). ηr = as defined in section 6.4.2 of this appendix.

The energy required to heat the same quantity of water over a 67 °F (37.3 °C) temperature rise is:

Where: N = total number of draws in the 24-hour simulated-use test. Mdel,i = the mass of water removed during the ith draw (i = 1 to N) as calculated in section 6.4.1 of this appendix, lb (kg). Cpi = the specific heat of the water withdrawn during the ith draw of the 24-hour simulated-use test, evaluated at (Tdel,i + Tin,i)/2, Btu/(lb· °F) (kJ/(kg· °C)). ηr = as defined in section 6.4.2 of this appendix.

The difference between these two values is:

QHWD = QHW,67 °F−QHW or, QHWD = QHW,37.3 °C−QHW

This difference (QHWD) must be added to the daily water heating energy consumption value. Thus, the daily energy consumption value, which takes into account that the temperature rise across the water heater may not be 67 °F (37.3 °C), is:

Qdm = Qda + QHWD

6.4.4 Uniform Energy Factor. The uniform energy factor, UEF, is computed as:

Where: N = total number of draws in the 24-hour simulated-use test. Qdm = the modified daily water heating energy consumption as computed in accordance with section 6.4.3 of this appendix, Btu (kJ). Mdel,i = the mass of water removed during the ith draw (i = 1 to N) as calculated in section 6.4.1 of this appendix, lb (kg). Cpi = the specific heat of the water withdrawn during the ith draw of the 24-hour simulated-use test, evaluated at (125 °F + 58 °F)/2 = 91.5 °F ((51.7 °C + 14.4 °C)/2 = 33.1 °C), Btu/(lb· °F) (kJ/(kg· °C)).

6.4.5 Annual Energy Consumption. The annual energy consumption for water heaters with rated storage volumes less than 2 gallons, Eannual, is computed as:

Where: UEF = the uniform energy factor as computed in accordance with section 6.4.4 of this appendix. 365 = the number of days in a year. V = the volume of hot water drawn during the applicable draw pattern, gallons. = 10 for the very-small-usage draw pattern. = 38 for the low-usage draw pattern. = 55 for the medium-usage draw pattern. = 84 for high-usage draw pattern. ρ = 8.24 lb/gallon, the density of water at 125 °F. Cp = 1.00 Btu/(lb °F), the specific heat of water at 91.5 °F. 67 = the nominal temperature difference between inlet and outlet water.

6.4.6 Annual Electrical Energy Consumption. The annual electrical energy consumption in kilowatt-hours for water heaters with rated storage volumes less than 2 gallons, Eannual,e, is computed as:

Where: Qe = the daily electrical energy consumption as defined in section 6.4.3 of this appendix, Btu (kJ). Eannual = the annual energy consumption as determined in accordance with section 6.4.5 of this appendix, Btu (kJ). Q = total energy used by the water heater during the 24-hour simulated-use test in accordance with section 6.4.3 of this appendix, Btu (kJ). Qdm = the modified daily water heating energy consumption as computed in accordance with section 6.4.3 of this appendix, Btu (kJ). 3412 = conversion factor from Btu to kWh.

6.4.7 Annual Fossil Fuel Energy Consumption. The annual fossil fuel energy consumption for water heaters with rated storage volumes less than 2 gallons, Eannual,f, is computed as:

Where: Eannual = the annual energy consumption as defined in section 6.4.5 of this appendix, Btu (kJ). Eannual,e = the annual electrical energy consumption as defined in section 6.4.6 of this appendix, kWh. 3412 = conversion factor from kWh to Btu.

6.5 Energy Efficiency at Optional Test Conditions. If testing is conducted at optional test conditions in accordance with section 5.6 of this appendix, calculate the energy efficiency at the test condition, EX, using the formulas in sections 6.3 or 6.4 of this appendix (as applicable), except substituting the applicable ambient temperature and supply water temperature used for testing (as specified in section 2.8 of this appendix) for the nominal ambient temperature and supply water temperature conditions used in the equations for determining UEF (i.e., 67.5 °F and 58 °F).

7. Test Set-Up Diagrams [88 FR 40473, June 21, 2023, as amended at 89 FR 37943, May 6, 2204]

Note:

On or after September 27, 2021, any representations made with respect to the energy use or efficiency of room air conditioners must be made in accordance with the results of testing pursuant to this appendix.

Prior to September 27, 2021, manufacturers must either test room air conditioners in accordance with this appendix, or the previous version of this appendix as it appeared in the Code of Federal Regulations on January 1, 2020. DOE notes that, because representations made on or after September 27, 2021 must be made in accordance with this appendix, manufacturers may wish to begin using this test procedure immediately.

0. Incorporation by Reference

DOE incorporated by reference the entire standard for AHAM RAC-1, ANSI/ASHRAE 16, ANSI/ASHRAE 41.1, ASHRAE 41.2-1987 (RA 1992), ASHRAE 41.3-2014, ASHRAE 41.6-2014, ASHRAE 41.11-2014 and IEC 62301 in § 430.3. However, only enumerated provisions of AHAM RAC-1 and ANSI/ASHRAE 16 apply to this appendix, as follows:

(1) ANSI/AHAM RAC-1:

(i) Section 4—Testing Conditions, Section 4.1—General

(ii) Section 5—Standard Measurement Test, Section 5.2—Standard Test Conditions: 5.2.1.1

(iii) Section 6—Tests and Measurements, Section 6.1—Cooling capacity

(iv) Section 6— Tests and Measurements, Section 6.2—Electrical Input

(2) ANSI/ASHRAE 16:

(i) Section 3—Definitions

(ii) Section 5—Instruments

(iii) Section 6—Apparatus, Section 6.1—Calorimeters, Sections 6.1.1-6.1.1., 6.1.1.3a, 6.1.1.4-6.1.4, including Table 1

(iv) Section 7—Methods of Testing, Section 7.1—Standard Test Methods, Section 7.1a, 7.1.1a

(v) Section 8—Test Procedures, Section 8.1—General

(vi) Section 8—Test Procedures, Section 8.2—Test Room Requirements

(viii) Section 8—Test Procedures, Section 8.3—Air Conditioner Break-In

(ix) Section 8—Test Procedures, Section 8.4—Air Conditioner Installation

(x) Section 8 —Test Procedures, Section 8.5—Cooling Capacity Test

(xi) Section 9—Data To Be Recorded, Section 9.1

(xii) Section 10—Measurement Uncertainty

(xiii) Normative Appendix A Cooling Capacity Calculations—Calorimeter Test Indoor and Calorimeter Test Outdoor

If there is any conflict between any industry standard(s) and this appendix, follow the language of the test procedure in this appendix, disregarding the conflicting industry standard language. Scope

This appendix contains the test requirements to measure the energy performance of a room air conditioner.

2. Definitions

2.1 “Active mode” means a mode in which the room air conditioner is connected to a mains power source, has been activated and is performing any of the following functions: Cooling or heating the conditioned space, or circulating air through activation of its fan or blower, with or without energizing active air-cleaning components or devices such as ultra-violet (UV) radiation, electrostatic filters, ozone generators, or other air-cleaning devices.

2.2 “ANSI/AHAM RAC-1” means the test standard published jointly by the American National Standards Institute and the Association of Home Appliance Manufacturers, titled “Energy Measurement Test Procedure for Room Air Conditioners,” Standard RAC-1-2020 (incorporated by reference; see § 430.3).

2.3 “ANSI/ASHRAE 16” means the test standard published jointly by the American National Standards Institute and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers titled “Method of Testing for Rating Room Air Conditioners and Packaged Terminal Air Conditioners,” Standard 16-2016 (incorporated by reference; see § 430.3).

2.4 “ANSI/ASHRAE 41.1” means the test standard published jointly by the American National Standards Institute and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers titled “Standard Method for Temperature Measurement,” Standard 41.1-2013 (incorporated by reference; see § 430.3).

2.5 “ASHRAE 41.2-1987 (RA 1992)” means the test standard published jointly by the American National Standards Institute and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers titled “Standard Methods for Laboratory Airflow Measurement,” Standard 41.2-1987 (RA 1992) (incorporated by reference; see § 430.3).

2.6 “ASHRAE 41.3-2014” means the test standard published jointly by the American National Standards Institute and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers titled “Standard Methods for Pressure Measurement,” Standard 41.3-2014 (incorporated by reference; see § 430.3).

2.7 “ASHRAE 41.6-2014” means the test standard published jointly by the American National Standards Institute and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers titled “Standard Method for Humidity Measurement,” Standard 41.6-2014 (incorporated by reference; see § 430.3).

2.8 “ASHRAE 41.11-2014” means the test standard published jointly by the American National Standards Institute and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers titled “Standard Methods for Power Measurement,” Standard 41.11-2014 (incorporated by reference; see § 430.3).

2.9 “Combined energy efficiency ratio” means the energy efficiency of a room air conditioner in British thermal units per watt-hour (Btu/Wh) and determined in section 5.2.2 of this appendix for single-speed room air conditioners and section 5.3.12 of this appendix for variable-speed room air conditioners.

2.10 “Cooling capacity” means the amount of cooling, in British thermal units per hour (Btu/h), provided to a conditioned space, measured under the specified conditions and determined in section 4.1 of this appendix.

2.11 “Cooling mode” means an active mode in which a room air conditioner has activated the main cooling function according to the thermostat or temperature sensor signal or switch (including remote control).

2.12 “Full compressor speed (full)” means the compressor speed at which the unit operates at full load test conditions, when using user settings with a unit thermostat setpoint of 75 °F to achieve maximum cooling capacity, according to the instructions in ANSI/ASHRAE Standard 16-2016.

2.13 “IEC 62301” means the test standard published by the International Electrotechnical Commission, titled “Household electrical appliances—Measurement of standby power,” Publication 62301 (Edition 2.0 2011-01), (incorporated by reference; see § 430.3).

2.14 “Inactive mode” means a standby mode that facilitates the activation of active mode by remote switch (including remote control) or internal sensor or which provides continuous status display.

2.15 “Intermediate compressor speed (intermediate)” means the compressor speed higher than the low compressor speed at which the measured capacity is higher than the capacity at low compressor speed by one third of the difference between Capacity4, the measured cooling capacity at test condition 4 in Table 1 of this appendix, and Capacity1, the measured cooling capacity with the full compressor speed at test condition 1 in Table 1 of this appendix, with a tolerance of plus 5 percent (designs with non-discrete speed stages) or the next highest inverter frequency step (designs with discrete speed steps), achieved by following the instructions certified by the manufacturer.

2.16 “Low compressor speed (low)” means the compressor speed at which the unit operates at low load test conditions, achieved by following the instructions certified by the manufacturer, such that Capacity4, the measured cooling capacity at test condition 4 in Table 1 of this appendix, is no less than 47 percent and no greater than 57 percent of Capacity1, the measured cooling capacity with the full compressor speed at test condition 1 in Table 1 of this appendix.

2.17 “Off mode” means a mode in which a room air conditioner is connected to a mains power source and is not providing any active or standby mode function and where the mode may persist for an indefinite time, including an indicator that only shows the user that the product is in the off position.

2.18 “Single-speed room air conditioner” means a type of room air conditioner that cannot automatically adjust the compressor speed based on detected conditions.

2.19 “Standby mode” means any product mode where the unit is connected to a mains power source and offers one or more of the following user-oriented or protective functions which may persist for an indefinite time:

(a) To facilitate the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer. A timer is a continuous clock function (which may or may not be associated with a display) that provides regular scheduled tasks (e.g., switching) and that operates on a continuous basis.

(b) Continuous functions, including information or status displays (including clocks) or sensor-based functions.

2.20 “Theoretical comparable single-speed room air conditioner” means a theoretical single-speed room air conditioner with the same cooling capacity and electrical power input as the variable-speed room air conditioner under test, with no cycling losses considered, at test condition 1 in Table 1 of this appendix.

2.21 “Variable-speed compressor” means a compressor that can vary its rotational speed in non-discrete stages or discrete steps from low to full.

2.22 “Variable-speed room air conditioner” means a type of room air conditioner that can automatically adjust compressor speed based on detected conditions.

3. Test Methods and General Instructions

3.1 Cooling mode. The test method for testing room air conditioners in cooling mode (“cooling mode test”) consists of applying the methods and conditions in AHAM RAC-1 Section 4, Paragraph 4.1 and for single-speed room air conditioners, Section 5, Paragraph 5.2.1.1, and for variable-speed room air conditioners, Section 5, Paragraph 5.2.1.2, except in accordance with ANSI/ASHRAE 16, including the references to ANSI/ASHRAE 41.1, ANSI/ASHRAE 41.2-1987 (RA 1992), ANSI/ASHRAE 41.3-2014, ANSI/ASHRAE 41.6-2014, and ANSI/ASHRAE 41.11-2014, all referenced therein, as defined in sections 2.3 through 2.8 of this appendix. Use the cooling capacity simultaneous indoor calorimeter and outdoor calorimeter test method in Section 7.1.a and Sections 8.1 through 8.5 of ANSI/ASHRAE 16, except as otherwise specified in this appendix. If a unit can operate on multiple operating voltages as distributed in commerce by the manufacturer, test it and rate the corresponding basic models at all nameplate operating voltages. For a variable-speed room air conditioner, test the unit following the cooling mode test a total of four times: One test at each of the test conditions listed in Table 1 of this appendix, consistent with section 4.1 of this appendix.

3.1.1 Through-the-wall installation. Install a non-louvered room air conditioner inside a compatible wall sleeve with the provided or manufacturer-required rear grille, and with only the included trim frame and other manufacturer-provided installation materials, per manufacturer instructions provided to consumers.

3.1.2 Power measurement accuracy. All instruments used for measuring electrical inputs to the test unit, reconditioning equipment, and any other equipment that operates within the calorimeter walls must be accurate to ±0.5 percent of the quantity measured.

3.1.3 Electrical supply. For cooling mode testing, test at each nameplate operating voltage, and maintain the input standard voltage within ±1 percent. Test at the rated frequency, maintained within ±1 percent.

3.1.4 Control settings. If the room air conditioner has network capabilities, all network features must be disabled throughout testing.

3.1.5 Measurement resolution. Record measurements at the resolution of the test instrumentation.

3.1.6 Temperature tolerances. Maintain each of the measured chamber dry-bulb and wet-bulb temperatures within a range of 1.0 °F.

3.2 Standby and off modes.

3.2.1 Install the room air conditioner in accordance with Section 5, Paragraph 5.2 of IEC 62301 and maintain the indoor test conditions (and outdoor test conditions where applicable) as required by Section 4, Paragraph 4.2 of IEC 62301. If testing is not conducted in a facility used for testing cooling mode performance, the test facility must comply with Section 4, Paragraph 4.2 of IEC 62301.

3.2.2 Electrical supply. For standby mode and off mode testing, maintain the electrical supply voltage and frequency according to the requirements in Section 4, Paragraph 4.3.1 of IEC 62301.

3.2.3 Supply voltage waveform. For the standby mode and off mode testing, maintain the electrical supply voltage waveform indicated in Section 4, Paragraph 4.3.2 of IEC 62301.

3.2.4 Wattmeter. The wattmeter used to measure standby mode and off mode power consumption must meet the resolution and accuracy requirements in Section 4, Paragraph 4.4 of IEC 62301.

3.2.5 Air ventilation damper. If the unit is equipped with an outdoor air ventilation damper, close this damper during standby mode and off mode testing.

4. Test Conditions and Measurements

4.1 Cooling mode.

4.1.1 Temperature conditions. Establish the test conditions described in Sections 4 and 5 of AHAM RAC-1 and in accordance with ANSI/ASHRAE 16, including the references to ANSI/ASHRAE 41.1 and ANSI/ASHRAE 41.6-2014, for cooling mode testing, with the following exceptions for variable-speed room air conditioners: Conduct the set of four cooling mode tests with the test conditions presented in Table 1 of this appendix. For test condition 1 and test condition 2, achieve the full compressor speed with user settings, as defined in section 2.12 of this appendix. For test condition 3 and test condition 4, set the required compressor speed in accordance with instructions the manufacturer provided to DOE.

4.1.2 Cooling capacity and power measurements. For single-speed units, measure the cooling mode cooling capacity (expressed in Btu/h), Capacity, and electrical power input (expressed in watts), Pcool, in accordance with Section 6, Paragraphs 6.1 and 6.2 of AHAM RAC-1, respectively, and in accordance with ANSI/ASHRAE 16, including the references to ANSI/ASHRAE 41.2-1987 (RA 1992) and ANSI/ASHRAE 41.11-2014. For variable-speed room air conditioners, measure the condition-specific cooling capacity (expressed in Btu/h), Capacitytc, and electrical power input (expressed in watts), Ptc, for each of the four cooling mode rating test conditions (tc), as required in Section 6, Paragraphs 6.1 and 6.2, respectively, of AHAM RAC-1, respectively, and in accordance with ANSI/ASHRAE 16, including the references to ANSI/ASHRAE 41.2-1987 (RA 1992) and ANSI/ASHRAE 41.11-2014.

4.2 Standby and off modes. Establish the testing conditions set forth in section 3.2 of this appendix, ensuring the unit does not enter any active mode during the test. For a unit that drops from a higher power state to a lower power state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301, allow sufficient time for the room air conditioner to reach the lower power state before proceeding with the test measurement. Use the sampling method test procedure specified in Section 5, Paragraph 5.3.2 of IEC 62301 for testing all standby and off modes, with the following modifications: Allow the product to stabilize for 5 to 10 minutes and use an energy use measurement period of 5 minutes.

4.2.1 If the unit has an inactive mode, as defined in section 2.14 of this appendix, measure and record the average inactive mode power, Pia, in watts.

4.2.2 If the unit has an off mode, as defined in section 2.17 of this appendix, measure and record the average off mode power, Pom, in watts.

5. Calculations

5.1 Annual energy consumption in inactive mode and off mode. Calculate the annual energy consumption in inactive mode and off mode, AECia/om, expressed in kilowatt-hours per year (kWh/year).

AECia/om = (Pia × tia + Pom × tom) Where: AECia/om = annual energy consumption in inactive mode and off mode, in kWh/year. Pia = average power in inactive mode, in watts, determined in section 4.2 of this appendix. Pom = average power in off mode, in watts, determined in section 4.2 of this appendix. tia = annual operating hours in inactive mode and multiplied by a 0.001 kWh/Wh conversion factor from watt-hours to kilowatt-hours. This value is 5.115 kWh/W if the unit has inactive mode and no off mode, 2.5575 kWh/W if the unit has both inactive and off mode, and 0 kWh/W if the unit does not have inactive mode. tom = annual operating hours in off mode and multiplied by a 0.001 kWh/Wh conversion factor from watt-hours to kilowatt-hours. This value is 5.115 kWh/W if the unit has off mode and no inactive mode, 2.5575 kWh/W if the unit has both inactive and off mode, and 0 kWh/W if the unit does not have off mode.

5.2 Combined energy efficiency ratio for single-speed room air conditioners. Calculate the combined energy efficiency ratio for single-speed room air conditioners as follows:

5.2.1 Single-speed room air conditioner annual energy consumption in cooling mode. Calculate the annual energy consumption in cooling mode for a single-speed room air conditioner, AECcool, expressed in kWh/year.

AECcool = 0.75 × Pcool Where: AECcool = single-speed room air conditioner annual energy consumption in cooling mode, in kWh/year. Pcool = single-speed room air conditioner average power in cooling mode, in watts, determined in section 4.1.2 of this appendix. 0.75 is 750 annual operating hours in cooling mode multiplied by a 0.001 kWh/Wh conversion factor from watt-hours to kilowatt-hours.

5.2.2 Single-speed room air conditioner combined energy efficiency ratio. Calculate the combined energy efficiency ratio, CEER, expressed in Btu/Wh, as follows:

Where: CEER = combined energy efficiency ratio, in Btu/Wh. Capacity = single-speed room air conditioner cooling capacity, in Btu/h, determined in section 4.1.2 of this appendix. AECcool = single-speed room air conditioner annual energy consumption in cooling mode, in kWh/year, calculated in section 5.2.1 of this appendix. AECia/om = annual energy consumption in inactive mode and off mode, in kWh/year, determined in section 5.1 of this appendix. 0.75 as defined in section 5.2.1 of this appendix.

5.3 Combined energy efficiency ratio for variable-speed room air conditioners. Calculate the combined energy efficiency ratio for variable-speed room air conditioners as follows:

5.3.1 Weighted electrical power input. Calculate the weighted electrical power input in cooling mode, Pwt, expressed in watts, as follows:

Pwt = Σtc Ptc × Wtc Where: Pwt = weighted electrical power input, in watts, in cooling mode. Ptc = electrical power input, in watts, in cooling mode for each test condition in Table 1 of this appendix. Wtc = weighting factors for each cooling mode test condition: 0.08 for test condition 1, 0.20 for test condition 2, 0.33 for test condition 3, and 0.39 for test condition 4. tc represents the cooling mode test condition: “1” for test condition 1 (95 °F condenser inlet dry-bulb temperature), “2” for test condition 2 (92 °F), “3” for test condition 3 (87 °F), and “4” for test condition 4 (82 °F).

5.3.2 Theoretical comparable single-speed room air conditioner. Calculate the cooling capacity, expressed in Btu/h, and the electrical power input, expressed in watts, for a theoretical comparable single-speed room air conditioner at all cooling mode test conditions.

Capacityss__tc = Capacity1 × (1 + (Mc × (95−Ttc))) Pss__tc = P1 × (1−(Mp × (95−Ttc))) Where: Capacityss__tc = theoretical comparable single-speed room air conditioner cooling capacity, in Btu/h, calculated for each of the cooling mode test conditions in Table 1 of this appendix. Capacity1 = variable-speed room air conditioner unit's cooling capacity, in Btu/h, determined in section 4.1.2 of this appendix for test condition 1 in Table 1 of this appendix. Pss__tc = theoretical comparable single-speed room air conditioner electrical power input, in watts, calculated for each of the cooling mode test conditions in Table 1 of this appendix. P1 = variable-speed room air conditioner unit's electrical power input, in watts, determined in section 4.1.2 of this appendix for test condition 1 in Table 1 of this appendix. Mc = adjustment factor to determine the increased capacity at lower outdoor test conditions, 0.0099 per °F. Mp = adjustment factor to determine the reduced electrical power input at lower outdoor test conditions, 0.0076 per °F. 95 is the condenser inlet dry-bulb temperature for test condition 1 in Table 1 of this appendix, 95 °F. Ttc = condenser inlet dry-bulb temperature for each of the test conditions in Table 1 of this appendix (in °F). tc as explained in section 5.3.1 of this appendix.

5.3.3 Variable-speed room air conditioner unit's annual energy consumption for cooling mode at each cooling mode test condition. Calculate the annual energy consumption for cooling mode under each test condition, AECtc, expressed in kilowatt-hours per year (kWh/year), as follows:

AECtc = 0.75 × Ptc Where: AECtc = variable-speed room air conditioner unit's annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix. Ptc = as defined in section 5.3.1 of this appendix. 0.75 as defined in section 5.2.1 of this appendix. tc as explained in section 5.3.1 of this appendix.

5.3.4 Variable-speed room air conditioner weighted annual energy consumption. Calculate the weighted annual energy consumption in cooling mode for a variable-speed room air conditioner, AECwt, expressed in kWh/year.

AECwt = Σtc AECtc × Wtc Where: AECwt = weighted annual energy consumption in cooling mode for a variable-speed room air conditioner, expressed in kWh/year. AECtc = variable-speed room air conditioner unit's annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix, determined in section 5.3.3 of this appendix. Wtc = weighting factors for each cooling mode test condition: 0.08 for test condition 1, 0.20 for test condition 2, 0.33 for test condition 3, and 0.39 for test condition 4. tc as explained in section 5.3.1 of this appendix.

5.3.5 Theoretical comparable single-speed room air conditioner annual energy consumption in cooling mode at each cooling mode test condition. Calculate the annual energy consumption in cooling mode for a theoretical comparable single-speed room air conditioner for cooling mode under each test condition, AECss__tc, expressed in kWh/year.

AECss__tc = 0.75 × Pss__tc Where: AECss__tc = theoretical comparable single-speed room air conditioner annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix. Pss__tc = theoretical comparable single-speed room air conditioner electrical power input, in watts, in cooling mode for each test condition in Table 1 of this appendix, determined in section 5.3.2 of this appendix. 0.75 as defined in section 5.2.1 of this appendix. tc as explained in section 5.3.1 of this appendix.

5.3.6 Variable-speed room air conditioner combined energy efficiency ratio at each cooling mode test condition. Calculate the variable-speed room air conditioner unit's combined energy efficiency ratio, CEERtc, for each test condition, expressed in Btu/Wh.

Where: CEERtc = variable-speed room air conditioner unit's combined energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix. Capacitytc = variable-speed room air conditioner unit's cooling capacity, in Btu/h, for each test condition in Table 1 of this appendix, determined in section 4.1.2 of this appendix. AECtc = variable-speed room air conditioner unit's annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix, determined in section 5.3.3 of this appendix. AECia/om = annual energy consumption in inactive mode and off mode, in kWh/year, determined in section 5.1 of this appendix. 0.75 as defined in section 5.2.1 of this appendix. tc as explained in section 5.3.1 of this appendix.

5.3.7 Theoretical comparable single-speed room air conditioner combined energy efficiency ratio. Calculate the combined energy efficiency ratio for a theoretical comparable single-speed room air conditioner, CEERss__tc, for each test condition, expressed in Btu/Wh.

Where: CEERss__tc = theoretical comparable single-speed room air conditioner combined energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix. Capacityss__tc = theoretical comparable single-speed room air conditioner cooling capacity, in Btu/h, for each test condition in Table 1 of this appendix, determined in section 5.3.2 of this appendix. AECss__tc = theoretical comparable single-speed room air conditioner annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix, determined in section 5.3.5 of this appendix. AECia/om = annual energy consumption in inactive mode and off mode, in kWh/year, determined in section 5.1 of this appendix. 0.75 as defined in section 5.2.1 of this appendix. tc as explained in section 5.3.1 of this appendix.

5.3.8 Theoretical comparable single-speed room air conditioner adjusted combined energy efficiency ratio. Calculate the adjusted combined energy efficiency ratio, for a theoretical comparable single-speed room air conditioner, CEERss__tc__adj, with cycling losses considered, for each test condition, expressed in Btu/Wh.

CEERss__tc__adj = CEERss__tc × CLFtc Where: CEERss__tc__adj = theoretical comparable single-speed room air conditioner adjusted combined energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix. CEERss__tc = theoretical comparable single-speed room air conditioner combined energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix, determined in section 5.3.7 of this appendix. CLFtc = cycling loss factor for each test condition; 1 for test condition 1, 0.956 for test condition 2, 0.883 for test condition 3, and 0.810 for test condition 4. tc as explained in section 5.3.1 of this appendix.

5.3.9 Weighted combined energy efficiency ratio. Calculate the weighted combined energy efficiency ratio for the variable-speed room air conditioner unit, CEERwt, and theoretical comparable single-speed room air conditioner, CEERss__wt, expressed in Btu/Wh.

CEERwt = Σtc CEERtc × Wtc CEERss__wt = Σtc CEERss__tc__adj × Wtc Where: CEERwt = variable-speed room air conditioner unit's weighted combined energy efficiency ratio, in Btu/Wh. CEERss__wt = theoretical comparable single-speed room air conditioner weighted combined energy efficiency ratio, in Btu/Wh. CEERtc = variable-speed room air conditioner unit's combined energy efficiency ratio, in Btu/Wh, at each test condition in Table 1 of this appendix, determined in section 5.3.6 of this appendix. CEERss__tc__adj = theoretical comparable single-speed room air conditioner adjusted combined energy efficiency ratio, in Btu/Wh, at each test condition in Table 1 of this appendix, determined in section 5.3.8 of this appendix. Wtc as defined in section 5.3.4 of this appendix. tc as explained in section 5.3.1 of this appendix.

5.3.10 Variable-speed room air conditioner performance adjustment factor. Calculate the variable-speed room air conditioner unit's performance adjustment factor, Fp.

Where: Fp = variable-speed room air conditioner unit's performance adjustment factor. CEERwt = variable-speed room air conditioner unit's weighted combined energy efficiency ratio, in Btu/Wh, determined in section 5.3.9 of this appendix. CEERss__wt = theoretical comparable single-speed room air conditioner weighted combined energy efficiency ratio, in Btu/Wh, determined in section 5.3.9 of this appendix.

5.3.11 Variable-speed room air conditioner combined energy efficiency ratio. Calculate the combined energy efficiency ratio, CEER, expressed in Btu/Wh, for variable-speed air conditioners.

CEER = CEER1 × (1 + Fp) Where: CEER = combined energy efficiency ratio, in Btu/Wh. CEER1 = variable-speed room air conditioner combined energy efficiency ratio for test condition 1 in Table 1 of this appendix, in Btu/Wh, determined in section 5.3.6 of this appendix. Fp = variable-speed room air conditioner performance adjustment factor, determined in section 5.3.10 of this appendix. [86 FR 16476, Mar. 29, 2021, as amended at 86 FR 24484, May 7, 2021; 88 FR 59791, Aug. 30, 2023]

1. Testing conditions.

1.1 Installation.

1.1.1 Electric heater. Install heater according to manufacturer's instructions. Heaters shall be connected to an electrical supply circuit of nameplate voltage with a wattmeter installed in the circuit. The wattmeter shall have a maximum error not greater than one percent.

1.1.2 Unvented gas heater. Install heater according to manufacturer's instructions. Heaters shall be connected to a gas supply line with a gas displacement meter installed between the supply line and the heater according to manufacturer's specifications. The gas displacement meter shall have a maximum error not greater than one percent. Gas heaters with electrical auxiliaries shall be connected to an electrical supply circuit of nameplate voltage with a wattmeter installed in the circuit. The wattmeter shall have a maximum error not greater than one percent.

1.1.3 Unvented oil heater. Install heater according to manufacturer's instructions. Oil heaters with electric auxiliaries shall be connected to an electrical supply circuit of nameplate voltage with a wattmeter installed in the circuit. The wattmeter shall have a maximum error not greater than one percent.

1.2 Temperature regulating controls. All temperature regulating controls shall be shorted out of the circuit or adjusted so that they will not operate during the test period.

1.3 Fan controls. All fan controls shall be set at the highest fan speed setting.

1.4 Energy supply.

1.4.1 Electrical supply. Supply power to the heater within one percent of the nameplate voltage.

1.4.2 Natural gas supply. For an unvented gas heater utilizing natural gas, maintain the gas supply to the heater with a normal inlet test pressure immediately ahead of all controls at 7 to 10 inches of water column. The regulator outlet pressure at normal supply test pressure shall be approximately that recommended by the manufacturer. The natural gas supplied should have a higher heating value within ±5 percent of 1,025 Btu's per standard cubic foot. Determine the higher heating value, in Btu's per standard cubic foot, for the natural gas to be used in the test, with an error no greater than one percent. Alternatively, the test can be conducted using “bottled” natural gas of a higher heating value within ±5 percent of 1,025 Btu's per standard cubic foot as long as the actual higher heating value of the bottled natural gas has been determined with an error no greater than one percent as certified by the supplier.

1.4.3 Propane gas supply. For an unvented gas heater utilizing propane, maintain the gas supply to the heater with a normal inlet test pressure immediately ahead of all controls at 11 to 13 inches of water column. The regulator outlet pressure at normal supply test pressure shall be that recommended by the manufacturer. The propane supplied should have a higher heating value of within±5 percent of 2,500 Btu's per standard cubic foot. Determine the higher heating value in Btu's per standard foot, for the propane to be used in the test, with an error no greater than one percent. Alternatively, the test can be conducted using “bottled” propane of a higher heating value within ±5 percent of 2,500 Btu's per standard cubic foot as long as the actual higher heating value of the bottled propane has been determined with an error no greater than one percent as certified by the supplier.

1.4.4 Oil supply. For an unvented oil heater utilizing kerosene, determine the higher heating value in Btu's per gallon with an error no greater than one percent. Alternatively, the test can be conducted using a tested fuel of a higher heating value within ±5 percent of 137,400 Btu's per gallon as long as the actual higher heating value of the tested fuel has been determined with an error no greater than one percent as certified by the supplier.

1.5 Energy flow instrumentation. Install one or more energy flow instruments which measure, as appropriate and with an error no greater than one percent, the quantity of electrical energy, natural gas, propane gas, or oil supplied to the heater.

2. Testing and measurements.

2.1 Electric power measurement. Establish the test conditions set forth in section 1 of this appendix. Allow an electric heater to warm up for at least five minutes before recording the maximum electric power measurement from the wattmeter. Record the maximum electric power (PE) expressed in kilowatts.

Allow the auxiliary electrical system of a forced air unvented gas, propane, or oil heater to operate for at least five minutes before recording the maximum auxiliary electric power measurement from the wattmeter. Record the maximum auxiliary electric power (PA) expressed in kilowatts.

2.2 Natural gas, propane, and oil measurement. Establish the test conditions as set forth in section 1 of this appendix. A natural gas, propane, or oil heater shall be operated for one hour. Using either the nameplate rating or the energy flow instrumentation set forth in section 1.5 of this appendix and the fuel supply rating set forth in sections 1.4.2, 1.4.3, or 1.4.4 of this appendix, as appropriate, determine the maximum fuel input (PF) of the heater under test in Btu's per hour. The energy flow instrumentation shall measure the maximum fuel input with an error no greater than one percent.

2.3 Pilot light measurement. Except as provided in section 2.3.1 of this appendix, measure the energy input rate to the pilot light (Qp), with an error no greater than 3 percent, for unvented heaters so equipped.

2.3.1 The measurement of Qp is not required for unvented heaters where the pilot light is designed to be turned off by the user when the heater is not in use (i.e., for units where turning the control to the OFF position will shut off the gas supply to the burner(s) and the pilot light). This provision applies only if an instruction to turn off the unit is provided on the heater near the gas control value (e.g., by label) by the manufacturer.

2.4 Electrical standby mode power measurement. Except as provided in section 2.4.1 of this appendix, for all electric heaters and unvented heaters with electrical auxiliaries, measure the standby power (PW,SB) in accordance with the procedures in IEC 62301 Second Edition (incorporated by reference; see § 430.3), with all electrical auxiliaries not activated. Voltage shall be as specified in section 1.4.1 Electrical supply of this appendix. The recorded standby power (PW,SB) shall be rounded to the second decimal place, and for loads greater than or equal to 10W, at least three significant figures shall be reported.

2.4.1 The measurement of PW,SB is not required for heaters designed to be turned off by the user when the heater is not in use (i.e., for units where turning the control to the OFF position will shut off the electrical supply to the heater). This provision applies only if an instruction to turn off the unit is provided on the heater (e.g., by label) by the manufacturer.

3. Calculations.

3.1 Annual energy consumption for primary electric heaters. For primary electric heaters, calculate the annual energy consumption (EE) expressed in kilowatt-hours per year and defined as:

EE = 2080(0.77)DHR where: 2080 = national average annual heating load hours 0.77 = adjustment factor DHR = design heating requirement and is equal to PE /1.2 in kilowatts. PE = as defined in 2.1 of this appendix 1.2 = typical oversizing factor for primary electric heaters

3.2 Annual energy consumption for primary electric heaters by geographic region of the United States. For primary electric heaters, calculate the annual energy consumption by geographic region of the United States (ER) expressed in kilowatt-hours per year and defined as:

ER = HLH(0.77) (DHR) where: HLH = heating load hours for a specific region determined from Figure 1 of this appendix in hours 0.77 = as defined in 3.1 of this appendix DHR = as defined in 3.1 of this appendix

3.3 Rated output for electric heaters. Calculate the rated output (Qout) for electric heaters, expressed in Btu's per hour, and defined as:

Qout = PE (3,412 Btu/kWh) where: PE = as defined in 2.1 of this appendix

3.4 Rated output for unvented heaters using either natural gas, propane, or oil. For unvented heaters using either natural gas, propane, or oil equipped without auxiliary electrical systems, the rated output (Qout), expressed in Btu's per hour, is equal to PF, as determined in section 2.2 of this appendix.

For unvented heaters using either natural gas, propane, or oil equipped with auxiliary electrical systems, calculate the rated output (Qout), expressed in Btu's per hour, and defined as:

Qout = PF + PA (3,412 Btu/kWh) where: PF = as defined in 2.2 of this appendix in Btu/hr PA = as defined in 2.1 of this appendix in Btu/hr (Energy Policy and Conservation Act, Pub. L. 94-163, as amended by Pub. L. 94-385; Federal Energy Administration Act of 1974, Pub. L. 93-275, as amended by Pub. L. 94-385; Department of Energy Organization Act, Pub. L. 95-91; E.O. 11790, 39 FR 23185) [43 FR 20132, May 10, 1978. Redesignated and amended at 44 FR 37938, June 29, 1979; 49 FR 12157, Mar. 28, 1984; 77 FR 74571, Dec. 17, 2012]

Note:

On or after April 14, 2023 and prior to September 11, 2023, any representations made with respect to the energy use or energy efficiency of a television must be based upon results generated under this appendix as it appeared in 10 CFR part 430 edition revised as of January 1, 2023, or this appendix. Beginning September 11, 2023 any representations made with respect to the energy use or efficiency of a television must be based upon results generated under this appendix. Given that beginning September 11, 2023, representations with respect to the energy use or efficiency of televisions must be made in accordance with tests conducted pursuant to this appendix, manufacturers may wish to begin using this test procedure as soon as possible.

0. Incorporation by Reference

DOE incorporated by reference in § 430.3, ANSI/CTA-2037-D in its entirety. However, only enumerated provisions of ANSI/CTA-2037-D are applicable to this appendix, as follows:

0.1 ANSI/CTA-2037-D

(a) Section 5 as referenced in section 2 of this appendix;

(b) Sections 6 and 8 through 11 as referenced in section 3 of this appendix;

(c) Section 7 as referenced in sections 3 and 4 of this appendix; and

(d) Annex A as referenced in section 4 of this appendix.

0.2 [Reserved] 1. Scope

This appendix covers the test requirements used to measure the energy and power consumption of television sets that have a diagonal screen size of at least fifteen inches; and are powered by mains power (including TVs with auxiliary batteries but not TVs with main batteries).

2. Definitions and Symbols

2.1. Definitions. The following terms are defined according to section 5.1 of ANSI/CTA-2037-D.

(a) Annual energy consumption (b) Automatic brightness control (c) Brightest selectable picture setting (d) Default preset picture setting (e) Dynamic Luminance (f) Energy-Efficient-Ethernet (g) Filmmaker Mode (h) Forced menu (i) Gloss Unit (GU) (j) HDR10 (k) High Dynamic Range (l) Home configuration (m) Hybrid Log Gamma (HLG) (n) Illuminance (o) International System of Units (p) Luminance (q) Main battery (r) Motion-Based Dynamic Dimming (s) Neutral density filter (t) Off Mode (u) On Mode (v) Perceptual Quantization Video (w) Preset picture setting (x) Quick start (y) Retail Configuration (z) Snoot (aa) Software (ab) Wake-By-Remote-Control-App (ac) Wake-By-Smart-Speaker (ad) Wake-On-Cast

2.2. Symbol usage. The symbols and abbreviations in section 5.2 of ANSI/CTA-2037-D apply to this test procedure.

3. Test Conduct

Determine the dynamic luminance and on mode and standby mode power consumption of TVs by following the procedure specified in sections 6 through 11 of ANSI/CTA-2037-D.

4. Calculation of Measured Values

Calculate the on mode power consumption, dynamic luminance, standby mode power consumption, and annual energy consumption as specified in Annex A of ANSI/CTA-2037-D. The following additional requirements are also applicable.

4.1. Round on mode power value as specified in Annex A of ANSI/CTA-2037-D.

4.2. Round dynamic luminance to the nearest tenth.

4.3. Round standby mode power as specified in section 7.1.2 of ANSI/CTA-2037-D.

4.4. Round annual energy consumption as specified in Annex A of ANSI/CTA-2037-D.

[88 FR 16109, Mar. 15, 2023]

Note:

After September 26, 2022, representations made with respect to the energy use of microwave ovens must fairly disclose the results of testing pursuant to this appendix.

On or after April 29, 2022 and prior to September 26, 2022 representations, including compliance certifications, made with respect to the energy use of microwave ovens must fairly disclose the results of testing pursuant to either this appendix or appendix I as it appeared at 10 CFR part 430, subpart B, in the 10 CFR parts 200 to 499 edition revised as of January 1, 2020. Representations made with respect to the energy use of microwave ovens within that range of time must fairly disclose the results of testing under the selected version. Given that after September 26, 2022 representations with respect to the energy use of microwave ovens must be made in accordance with tests conducted pursuant to this appendix, manufacturers may wish to begin using this test procedure as soon as possible.

1. Definitions

The following definitions apply to the test procedures in this appendix, including the test procedures incorporated by reference:

1.1 Active mode means a mode in which the product is connected to a mains power source, has been activated, and is performing the main function of producing heat by means of a gas flame, electric resistance heating, electric inductive heating, or microwave energy.

1.2 Built-in means the product is enclosed in surrounding cabinetry, walls, or other similar structures on at least three sides, and can be supported by surrounding cabinetry or the floor.

1.3 Combined cooking product means a household cooking appliance that combines a cooking product with other appliance functionality, which may or may not include another cooking product. Combined cooking products include the following products: Conventional range, microwave/conventional cooking top, microwave/conventional oven, and microwave/conventional range.

1.4 Drop-in means the product is supported by horizontal surface cabinetry.

1.5 IEC 62301 (First Edition) means the test standard published by the International Electrotechnical Commission, titled “Household electrical appliances—Measurement of standby power,” Publication 62301 (First Edition 2005-06) (incorporated by reference; see § 430.3).

1.6 IEC 62301 (Second Edition) means the test standard published by the International Electrotechnical Commission, titled “Household electrical appliances—Measurement of standby power,” Publication 62301 (Edition 2.0 2011-01) (incorporated by reference; see § 430.3).

1.7 Normal non-operating temperature means a temperature of all areas of an appliance to be tested that is within 5 °F (2.8 °C) of the temperature that the identical areas of the same basic model of the appliance would attain if it remained in the test room for 24 hours while not operating with all oven doors closed.

1.8 Off mode means any mode in which a cooking product is connected to a mains power source and is not providing any active mode or standby function, and where the mode may persist for an indefinite time. An indicator that only shows the user that the product is in the off position is included within the classification of an off mode.

1.9 Standby mode means any mode in which a cooking product is connected to a mains power source and offers one or more of the following user-oriented or protective functions which may persist for an indefinite time:

(1) Facilitation of the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer;

(2) Provision of continuous functions, including information or status displays (including clocks) or sensor-based functions. A timer is a continuous clock function (which may or may not be associated with a display) that allows for regularly scheduled tasks and that operates on a continuous basis.

2. Test Conditions

2.1 Installation. Install a drop-in or built-in cooking product in a test enclosure in accordance with manufacturer's instructions. If the manufacturer's instructions specify that the cooking product may be used in multiple installation conditions, install the appliance according to the built-in configuration. Completely assemble the product with all handles, knobs, guards, and similar components mounted in place. Position any electric resistance heaters and baffles in accordance with the manufacturer's instructions.

2.1.1 Microwave ovens, excluding any microwave oven component of a combined cooking product. Install the microwave oven in accordance with the manufacturer's instructions and connect to an electrical supply circuit with voltage as specified in section 2.2.1 of this appendix. Install the microwave oven in accordance with Section 5, Paragraph 5.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3), disregarding the provisions regarding batteries and the determination, classification, and testing of relevant modes. If the microwave oven can communicate through a network (e.g., Bluetooth® or internet connection), disable the network function, if it is possible to disable it by means provided in the manufacturer's user manual, for the duration of testing. If the network function cannot be disabled, or means for disabling the function are not provided in the manufacturer's user manual, test the microwave oven with the network function in the factory default setting or in the as-shipped condition as instructed in Section 5, paragraph 5.2 of IEC 62301 (Second Edition). Configure the unit such that the clock display remains on during testing, regardless of manufacturer's instructions or default setting or supplied setting, unless the clock display powers down automatically with no option for the consumer to override this function. Install a watt meter in the circuit that meets the requirements of section 2.8.1.2 of this appendix.

2.2 Energy supply.

2.2.1 Electrical supply.

2.2.1.1 Voltage. For microwave oven testing, maintain the electrical supply to the unit at 240/120 volts ±1 percent. Maintain the electrical supply frequency for all products at 60 hertz ±1 percent.

2.3 Air circulation. Maintain air circulation in the room sufficient to secure a reasonably uniform temperature distribution, but do not cause a direct draft on the unit under test.

2.4 Ambient room test conditions.

2.4.1 Standby mode and off mode ambient temperature. For standby mode and off mode testing, maintain room ambient air temperature conditions as specified in Section 4, Paragraph 4.2 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3).

2.5 Normal non-operating temperature. All areas of the appliance to be tested must attain the normal non-operating temperature, as defined in section 1.7 of this appendix, before any testing begins. Measure the applicable normal non-operating temperature using the equipment specified in sections 2.6.2.1 of this appendix.

2.6 Instrumentation. Perform all test measurements using the following instruments, as appropriate:

2.6.1 Electrical Measurements.

2.6.1.1 Standby mode and off mode watt meter. The watt meter used to measure standby mode and off mode power must meet the requirements specified in Section 4, Paragraph 4.4 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3). For microwave oven standby mode and off mode testing, if the power measuring instrument used for testing is unable to measure and record the crest factor, power factor, or maximum current ratio during the test measurement period, measure the crest factor, power factor, and maximum current ratio immediately before and after the test measurement period to determine whether these characteristics meet the requirements specified in Section 4, Paragraph 4.4 of IEC 62301 (Second Edition).

2.6.2 Temperature measurement equipment.

2.6.2.1 Room temperature indicating system. For the test of microwave ovens, the room temperature indicating system must have an error no greater than ±1 °F (±0.6 °C) over the range 65° to 90 °F (18 °C to 32 °C).

3. Test Methods and Measurements

3.1. Test methods.

3.1.1 Microwave oven.

3.1.1.1 Microwave oven test standby mode and off mode power except for any microwave oven component of a combined cooking product. Establish the testing conditions set forth in section 2, Test Conditions, of this appendix. For microwave ovens that drop from a higher power state to a lower power state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3), allow sufficient time for the microwave oven to reach the lower power state before proceeding with the test measurement. Follow the test procedure as specified in Section 5, Paragraph 5.3.2 of IEC 62301 (Second Edition). For units in which power varies as a function of displayed time in standby mode, set the clock time to 3:23 and use the average power approach described in Section 5, Paragraph 5.3.2(a) of IEC 62301 (First Edition), but with a single test period of 10 minutes +0/−2 sec after an additional stabilization period until the clock time reaches 3:33. If a microwave oven is capable of operation in either standby mode or off mode, as defined in sections 1.9 and 1.8 of this appendix, respectively, or both, test the microwave oven in each mode in which it can operate.

3.2 Test measurements.

3.2.1 Microwave oven standby mode and off mode power except for any microwave oven component of a combined cooking product. Make measurements as specified in Section 5, Paragraph 5.3 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3). If the microwave oven is capable of operating in standby mode, as defined in section 1.9 of this appendix, measure the average standby mode power of the microwave oven, PSB, in watts as specified in section 3.1.1.1 of this appendix. If the microwave oven is capable of operating in off mode, as defined in section 1.8 of this appendix, measure the average off mode power of the microwave oven, POM, as specified in section 3.1.1.1.

3.3 Recorded values.

3.3.1 For microwave ovens except for any microwave oven component of a combined cooking product, record the average standby mode power, PSB, for the microwave oven standby mode, as determined in section 3.2.1 of this appendix for a microwave oven capable of operating in standby mode. Record the average off mode power, POM, for the microwave oven off mode power test, as determined in section 3.2.1 of this appendix for a microwave oven capable of operating in off mode.

[85 FR 50766, Aug. 18, 2020, as amended at 87 FR 18271, Mar. 30, 2022; 87 FR 51538, Aug. 22, 2022]

Note:

Any representation related to energy consumption of conventional cooking tops, including the conventional cooking top component of combined cooking products, made after February 20, 2023 must be based upon results generated under this test procedure. Upon the compliance date(s) of any energy conservation standard(s) for conventional cooking tops, including the conventional cooking top component of combined cooking products, use of the applicable provisions of this test procedure to demonstrate compliance with the energy conservation standard is required.

0. Incorporation by Reference

DOE incorporated by reference in § 430.3, the entire test standard for IEC 60350-2; IEC 62301 (First Edition); and IEC 62301 (Second Edition). However, only enumerated provisions of those standards are applicable to this appendix, as follows. If there is a conflict, the language of the test procedure in this appendix takes precedence over the referenced test standards.

0.1 IEC 60350-2

(a) Section 5.1 as referenced in section 2.4.1 of this appendix;

(b) Section 5.3 as referenced in sections 2.7.1.1, 2.7.3.1, 2.7.3.3, 2.7.3.4, 2.7.4, and 2.7.5 of this appendix;

(c) Section 5.5 as referenced in section 2.5.1 of this appendix;

(d) Section 5.6.1 as referenced in section 2.6.1 of this appendix;

(e) Section 5.6.1.5 as referenced in section 3.1.1.2 of this appendix;

(f) Section 6.3 as referenced in section 3.1.1.1.1 of this appendix;

(g) Section 6.3.1 as referenced in section 3.1.1.1.1 of this appendix;

(h) Section 6.3.2 as referenced in section 3.1.1.1.1 of this appendix;

(i) Section 7.5.1 as referenced in section 2.6.2 of this appendix;

(j) Section 7.5.2 as referenced in section 3.1.4.4 of this appendix;

(k) Section 7.5.2.1 as referenced in sections 1 and 3.1.4.2 of this appendix;

(l) Section 7.5.2.2 as referenced in section 3.1.4.4 of this appendix;

(m) Section 7.5.4.1 as referenced in sections 1 and 3.1.4.5 of this appendix;

(n) Annex A as referenced in section 3.1.1.2 of this appendix;

(o) Annex B as referenced in sections 2.6.1 and 2.8.3 of this appendix; and

(p) Annex C as referenced in section 3.1.4.1 of this appendix.

0.2 IEC 62301 (First Edition)

(a) Paragraph 5.3 as referenced in section 3.2 of this appendix; and

(b) Paragraph 5.3.2 as referenced in section 3.2 of this appendix.

0.3 IEC 62301 (Second Edition)

(a) Paragraph 4.2 as referenced in section 2.4.2 of this appendix;

(b) Paragraph 4.3.2 as referenced in section 2.2.1.1.2 of this appendix;

(c) Paragraph 4.4 as referenced in section 2.7.1.2 of this appendix;

(d) Paragraph 5.1 as referenced in section 3.2 of this appendix; and

(e) Paragraph 5.3.2 as referenced in section 3.2 of this appendix.

1. Definitions

The following definitions apply to the test procedures in this appendix, including the test procedures incorporated by reference:

Active mode means a mode in which the product is connected to a mains power source, has been activated, and is performing the main function of producing heat by means of a gas flame, electric resistance heating, or electric inductive heating.

Built-in means the product is enclosed in surrounding cabinetry, walls, or other similar structures on at least three sides, and can be supported by surrounding cabinetry or the floor.

Combined cooking product means a household cooking appliance that combines a cooking product with other appliance functionality, which may or may not include another cooking product. Combined cooking products include the following products: conventional range, microwave/conventional cooking top, microwave/conventional oven, and microwave/conventional range.

Combined low-power mode means the aggregate of available modes other than active mode, but including the delay start mode portion of active mode.

Cooking area means an area on a conventional cooking top surface heated by an inducted magnetic field where cookware is placed for heating, where more than one cookware item can be used simultaneously and controlled separately from other cookware placed on the cooking area, and that may or may not include limitative markings.

Cooking top control means a part of the conventional cooking top used to adjust the power and the temperature of the cooking zone or cooking area for one cookware item.

Cooking zone means a part of a conventional cooking top surface that is either a single electric resistance heating element, multiple concentric sizes of electric resistance heating elements, an inductive heating element, or a gas surface unit that is defined by limitative markings on the surface of the cooking top and can be controlled independently of any other cooking area or cooking zone.

Cycle finished mode means a standby mode in which a conventional cooking top provides continuous status display following operation in active mode.

Drop-in means the product is supported by horizontal surface cabinetry.

Freestanding means the product is supported by the floor and is not specified in the manufacturer's instructions as able to be installed such that it is enclosed by surrounding cabinetry, walls, or other similar structures.

Inactive mode means a standby mode that facilitates the activation of active mode by remote switch (including remote control), internal sensor, or timer, or that provides continuous status display.

Infinite power settings means a cooking zone control without discrete power settings, which allows for selection of any power setting up to the maximum power setting.

Maximum-below-threshold power setting means the power setting on a conventional cooking top that is the highest power setting that results in smoothened water temperature data that do not meet the evaluation criteria specified in Section 7.5.4.1 of IEC 60350-2.

Maximum power setting means the maximum possible power setting if only one cookware item is used on the cooking zone or cooking area of a conventional cooking top, including any optional power boosting features. For conventional electric cooking tops with multi-ring cooking zones or cooking areas, the maximum power setting is the maximum power corresponding to the concentric heating element with the largest diameter, which may correspond to a power setting which may include one or more of the smaller concentric heating elements. For conventional gas cooking tops with multi-ring cooking zones, the maximum power setting is the maximum heat input rate when the maximum number of rings of the cooking zone are ignited.

Minimum-above-threshold power setting means the power setting on a conventional cooking top that is the lowest power setting that results in smoothened water temperature data that meet the evaluation criteria specified in Section 7.5.4.1 of IEC 60350-2. This power setting is also referred to as the simmering setting.

Multi-ring cooking zone means a cooking zone on a conventional cooking top with multiple concentric sizes of electric resistance heating elements or gas burner rings.

Off mode means any mode in which a product is connected to a mains power source and is not providing any active mode or standby function, and where the mode may persist for an indefinite time. An indicator that only shows the user that the product is in the off position is included within the classification of an off mode.

Power setting means a setting on a cooking zone control that offers a gas flame, electric resistance heating, or electric inductive heating.

Simmering period means, for each cooking zone, the 20-minute period during the simmering test starting at time t90.

Smoothened water temperature means the 40-second moving-average temperature as calculated in Section 7.5.4.1 of IEC 60350-2, rounded to the nearest 0.1 degree Celsius.

Specialty cooking zone means a warming plate, grill, griddle, or any cooking zone that is designed for use only with non-circular cookware, such as a bridge zone. Specialty cooking zones are not tested under this appendix.

Stable temperature means a temperature that does not vary by more than 1 °C over a 5-minute period.

Standard cubic foot of gas means the quantity of gas that occupies 1 cubic foot when saturated with water vapor at a temperature of 60 °F and a pressure of 14.73 pounds per square inch (30 inches of mercury or 101.6 kPa).

Standby mode means any mode in which a product is connected to a mains power source and offers one or more of the following user-oriented or protective functions which may persist for an indefinite time:

(1) Facilitation of the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer;

(2) Provision of continuous functions, including information or status displays (including clocks) or sensor-based functions. A timer is a continuous clock function (which may or may not be associated with a display) that allows for regularly scheduled tasks and that operates on a continuous basis.

Target turndown temperature (Tctarget) means the temperature as calculated according to Section 7.5.2.1 of IEC 60350-2 and section 3.1.4.2 of this appendix, for each cooking zone.

Thermocouple means a device consisting of two dissimilar metals which are joined together and, with their associated wires, are used to measure temperature by means of electromotive force.

Time t90 means the first instant during the simmering test for each cooking zone at which the smoothened water temperature is greater than or equal to 90 °C.

Turndown temperature (Tc) means, for each cooking zone, the measured water temperature at the time at which the tester begins adjusting the cooking top controls to change the power setting.

2. Test Conditions and Instrumentation

2.1 Installation. Install the conventional cooking top or combined cooking product in accordance with the manufacturer's instructions. If the manufacturer's instructions specify that the product may be used in multiple installation conditions, install the product according to the built-in configuration. Completely assemble the product with all handles, knobs, guards, and similar components mounted in place. Position any electric resistance heaters, gas burners, and baffles in accordance with the manufacturer's instructions. If the product can communicate through a network (e.g., Bluetooth® or internet connection), disable the network function, if it is possible to disable it by means provided in the manufacturer's user manual, for the duration of testing. If the network function cannot be disabled, or if means for disabling the function are not provided in the manufacturer's user manual, the product shall be tested in the factory default setting or in the as-shipped condition.

2.1.1 Freestanding combined cooking product. Install a freestanding combined cooking product with the back directly against, or as near as possible to, a vertical wall which extends at least 1 foot above the product and 1 foot beyond both sides of the product, and with no side walls.

2.1.2 Drop-in or built-in combined cooking product. Install a drop-in or built-in combined cooking product in a test enclosure in accordance with manufacturer's instructions.

2.1.3 Conventional cooking top. Install a conventional cooking top with the back directly against, or as near as possible to, a vertical wall which extends at least 1 foot above the product and 1 foot beyond both sides of the product.

2.2 Energy supply.

2.2.1 Electrical supply.

2.2.1.1 Supply voltage.

2.2.1.1.1 Active mode supply voltage. During active mode testing, maintain the electrical supply to the product at either 240 volts ±1 percent or 120 volts ±1 percent, according to the manufacturer's instructions, except for products which do not allow for a mains electrical supply. The actual voltage shall be maintained and recorded throughout the test. Instantaneous voltage fluctuations caused by the turning on or off of electrical components shall not be considered.

2.2.1.1.2 Standby mode and off mode supply voltage. During standby mode and off mode testing, maintain the electrical supply to the product at either 240 volts ±1 percent, or 120 volts ±1 percent, according to the manufacturer's instructions. Maintain the electrical supply voltage waveform specified in Section 4, Paragraph 4.3.2 of IEC 62301 (Second Edition), disregarding the provisions regarding batteries and the determination, classification, and testing of relevant modes. If the power measuring instrument used for testing is unable to measure and record the total harmonic content during the test measurement period, total harmonic content may be measured and recorded immediately before and after the test measurement period.

2.2.1.2 Supply frequency. Maintain the electrical supply frequency for all tests at 60 hertz ±1 percent.

2.2.2 Gas supply.

2.2.2.1 Natural gas. Maintain the natural gas pressure immediately ahead of all controls of the unit under test at 7 to 10 inches of water column, except as specified in section 3.1.3 of this appendix. The natural gas supplied should have a higher heating value (dry-basis) of approximately 1,025 Btu per standard cubic foot. Obtain the higher heating value on a dry basis of gas, Hn, in Btu per standard cubic foot, for the natural gas to be used in the test either from measurements made by the manufacturer conducting the test using equipment that meets the requirements described in section 2.7.2.2 of this appendix or by the use of bottled natural gas whose gross heating value is certified to be at least as accurate a value that meets the requirements in section 2.7.2.2 of this appendix.

2.2.2.2 Propane. Maintain the propane pressure immediately ahead of all controls of the unit under test at 11 to 13 inches of water column, except as specified in section 3.1.3 of this appendix. The propane supplied should have a higher heating value (dry-basis) of approximately 2,500 Btu per standard cubic foot. Obtain the higher heating value on a dry basis of gas, Hp, in Btu per standard cubic foot, for the propane to be used in the test either from measurements made by the manufacturer conducting the test using equipment that meets the requirements described in section 2.7.2.2 of this appendix, or by the use of bottled propane whose gross heating value is certified to be at least as accurate a value that meets the requirements described in section 2.7.2.2 of this appendix.

2.3 Air circulation. Maintain air circulation in the room sufficient to secure a reasonably uniform temperature distribution, but do not cause a direct draft on the unit under test.

2.4 Ambient room test conditions.

2.4.1 Active mode ambient conditions. During active mode testing, maintain the ambient room air pressure specified in Section 5.1 of IEC 60350-2, and maintain the ambient room air temperature at 25 ± 5 °C with a target temperature of 25 °C.

2.4.2 Standby mode and off mode ambient conditions. During standby mode and off mode testing, maintain the ambient room air temperature conditions specified in Section 4, Paragraph 4.2 of IEC 62301 (Second Edition).

2.5 Product temperature.

2.5.1 Product temperature stability. Prior to any testing, the product must achieve a stable temperature meeting the ambient room air temperature specified in section 2.4 of this appendix. For all conventional cooking tops, forced cooling may be used to assist in reducing the temperature of the product between tests, as specified in Section 5.5 of IEC 60350-2. Forced cooling must not be used during the period of time used to assess temperature stability.

2.5.2 Product temperature measurement. Measure the product temperature in degrees Celsius using the equipment specified in section 2.7.3.3 of this appendix at the following locations.

2.5.2.1 Measure the product temperature at the center of the cooking zone under test for any gas burner adjustment in section 3.1.3 of this appendix and per-cooking zone energy consumption test in section 3.1.4 of this appendix, except that the product temperature measurement is not required for any potential simmering setting pre-selection test in section 3.1.4.3 of this appendix. For a conventional gas cooking top, measure the product temperature inside the burner body of the cooking zone under test, after temporarily removing any burner cap on that cooking zone.

2.5.2.2 Measure the temperature at the center of each cooking zone for the standby mode and off mode power test in section 3.2 of this appendix. For a conventional gas cooking top, measure the temperature inside the burner body of each cooking zone, after temporarily removing any burner cap on that cooking zone. Calculate the product temperature as the average of the temperatures at the center of each cooking zone.

2.6 Test loads.

2.6.1 Test vessels. The test vessel for active mode testing of each cooking zone must meet the specifications in Section 5.6.1 and Annex B of IEC 60350-2.

2.6.2 Water load. The water used to fill the test vessels for active mode testing must meet the specifications in Section 7.5.1 of IEC 60350-2. The water temperature at the start of each test, except for the gas burner adjustment in section 3.1.3 of this appendix and the potential simmering setting pre-selection test in section 3.1.4.3 of this appendix, must have an initial temperature equal to 25 ± 0.5 °C.

2.7 Instrumentation. Perform all test measurements using the following instruments, as appropriate:

2.7.1 Electrical measurements.

2.7.1.1 Active mode watt-hour meter. The watt-hour meter for measuring the active mode electrical energy consumption must have a resolution as specified in Table 1 of Section 5.3 of IEC 60350-2. Measurements shall be made as specified in Table 2 of Section 5.3 of IEC 60350-2.

2.7.1.2 Standby mode and off mode watt meter. The watt meter used to measure standby mode and off mode power must meet the specifications in Section 4, Paragraph 4.4 of IEC 62301 (Second Edition). If the power measuring instrument used for testing is unable to measure and record the crest factor, power factor, or maximum current ratio during the test measurement period, measure the crest factor, power factor, and maximum current ratio immediately before and after the test measurement period to determine whether these characteristics meet the specifications in Section 4, Paragraph 4.4 of IEC 62301 (Second Edition).

2.7.2 Gas measurements.

2.7.2.1 Gas meter. The gas meter used for measuring gas consumption must have a resolution of 0.01 cubic foot or less and a maximum error no greater than 1 percent of the measured valued for any demand greater than 2.2 cubic feet per hour.

2.7.2.2 Standard continuous flow calorimeter. The maximum error of the basic calorimeter must be no greater than 0.2 percent of the actual heating value of the gas used in the test. The indicator readout must have a maximum error no greater than 0.5 percent of the measured value within the operating range and a resolution of 0.2 percent of the full-scale reading of the indicator instrument.

2.7.2.3 Gas line temperature. The incoming gas temperature must be measured at the gas meter. The instrument for measuring the gas line temperature shall have a maximum error no greater than ±2 °F over the operating range.

2.7.2.4 Gas line pressure. The incoming gas pressure must be measured at the gas meter. The instrument for measuring the gas line pressure must have a maximum error no greater than 0.1 inches of water column.

2.7.3 Temperature measurements.

2.7.3.1 Active mode ambient room temperature. The room temperature indicating system must meet the specifications in Table 1 of Section 5.3 of IEC 60350-2. Measurements shall be made as specified in Table 2 of Section 5.3 of IEC 60350-2.

2.7.3.2 Standby mode and off mode ambient room temperature. The room temperature indicating system must have an error no greater than ±1 °F (±0.6 °C) over the range 65° to 90 °F (18 °C to 32 °C).

2.7.3.3 Product temperature. The temperature indicating system must have an error no greater than ±1 °F (±0.6 °C) over the range 65° to 90 °F (18 °C to 32 °C). Measurements shall be made as specified in Table 2 of Section 5.3 of IEC 60350-2.

2.7.3.4 Water temperature. Measure the test vessel water temperature with a thermocouple that meets the specifications in Table 1 of Section 5.3 of IEC 60350-2. Measurements shall be made as specified in Table 2 of Section 5.3 of IEC 60350-2.

2.7.4 Room air pressure. The room air pressure indicating system must meet the specifications in Table 1 of Section 5.3 of IEC 60350-2.

2.7.5 Water mass. The scale used to measure the mass of the water load must meet the specifications in Table 1 of Section 5.3 of IEC 60350-2.

2.8 Power settings.

2.8.1 On a multi-ring cooking zone on a conventional gas cooking top, all power settings are considered, whether they ignite all rings of orifices or not.

2.8.2 On a multi-ring cooking zone on a conventional electric cooking top, only power settings corresponding to the concentric heating element with the largest diameter are considered, which may correspond to operation with one or more of the smaller concentric heating elements energized.

2.8.3 On a cooking zone with infinite power settings where the available range of rotation from maximum to minimum is more than 150 rotational degrees, evaluate power settings that are spaced by 10 rotational degrees. On a cooking zone with infinite power settings where the available range of rotation from maximum to minimum is less than or equal to 150 rotational degrees, evaluate power settings that are spaced by 5 rotational degrees, starting with the first position that meets the definition of a power setting, irrespective of how the knob is labeled. Polar coordinate paper, as provided in Annex B of IEC 60350-2 may be used to mark power settings.

3. Test Methods and Measurements

3.1 Active mode. Perform the following test methods for conventional cooking tops and the conventional cooking top component of a combined cooking product.

3.1.1 Test vessel and water load selection.

3.1.1.1 Conventional electric cooking tops.

3.1.1.1.1 For cooking zones, measure the size of each cooking zone as specified in Section 6.3.2 of IEC 60350-2, not including any specialty cooking zones as defined in section 1 of this appendix. For circular cooking zones on smooth cooking tops, the cooking zone size is determined using the outer diameter of the printed marking, as specified in Section 6.3 of IEC 60350-2. For open coil cooking zones, the cooking zone size is determined using the widest diameter of the coil, see Figure 3.1.1.1. For non-circular cooking zones, the cooking zone size is determined by the measurement of the shorter side or minor axis. For cooking areas, determine the number of cooking zones as specified in Section 6.3.1 of IEC 60350-2.

3.1.1.1.2 Determine the test vessel diameter in millimeters (mm) and water load mass in grams (g) for each measured cooking zone. For cooking zones, test vessel selection is based on cooking zone size as specified in Table 3 in Section 5.6.1.5 of IEC 60350-2. For cooking areas, test vessel selection is based on the number of cooking zones as specified in Annex A of IEC 60350-2. If a selected test vessel (including its lid) cannot be centered on the cooking zone due to interference with a structural component of the cooking top, the test vessel with the largest diameter that can be centered on the cooking zone shall be used. The allowable tolerance on the water load weight is ±0.5 g.

3.1.1.2 Conventional gas cooking tops.

3.1.1.2.1 Record the nominal heat input rate for each cooking zone, not including any specialty cooking zones as defined in section 1 of this appendix.

3.1.1.2.2 Determine the test vessel diameter in mm and water load mass in g for each measured cooking zone according to Table 3.1 of this appendix. If a selected test vessel cannot be centered on the cooking zone due to interference with a structural component of the cooking top, the test vessel with the largest diameter that can be centered on the cooking zone shall be used. The allowable tolerance on the water load weight is ±0.5 g.

3.1.2 Unit Preparation. Before the first measurement is taken, all cooking zones must be operated simultaneously for at least 10 minutes at maximum power. This step shall be conducted once per product.

3.1.3 Gas burner adjustment. Prior to active mode testing of each tested burner of a conventional gas cooking top, the burner heat input rate must be adjusted, if necessary, to within 2 percent of the nominal heat input rate of the burner as specified by the manufacturer. Prior to ignition and any adjustment of the burner heat input rate, the conventional cooking top must achieve the product temperature specified in section 2.5 of this appendix. Ignite and operate the gas burner under test with the test vessel and water mass specified in section 3.1.1 of this appendix. Measure the heat input rate of the gas burner under test starting 5 minutes after ignition. If the measured input rate of the gas burner under test is within 2 percent of the nominal heat input rate of the burner as specified by the manufacturer, no adjustment of the heat input rate shall be made.

3.1.3.1 Conventional gas cooking tops with an adjustable internal pressure regulator. If the measured heat input rate of the burner under test is not within 2 percent of the nominal heat input rate of the burner as specified by the manufacturer, adjust the product's internal pressure regulator such that the heat input rate of the burner under test is within 2 percent of the nominal heat input rate of the burner as specified by the manufacturer. Adjust the burner with sufficient air flow to prevent a yellow flame or a flame with yellow tips. Complete section 3.1.4 of this appendix while maintaining the same gas pressure regulator adjustment.

3.1.3.2 Conventional gas cooking tops with a non-adjustable internal pressure regulator or without an internal pressure regulator. If the measured heat input rate of the burner under test is not within 2 percent of the nominal heat input rate of the burner as specified by the manufacturer, remove the product's internal pressure regulator, or block it in the open position, and initially maintain the gas pressure ahead of all controls of the unit under test approximately equal to the manufacturer's recommended manifold pressure. Adjust the gas supply pressure such that the heat input rate of the burner under test is within 2 percent of the nominal heat input rate of the burner as specified by the manufacturer. Adjust the burner with sufficient air flow to prevent a yellow flame or a flame with yellow tips. Complete section 3.1.4 of this appendix while maintaining the same gas pressure regulator adjustment.

3.1.4 Per-cooking zone energy consumption test. Establish the test conditions set forth in section 2 of this appendix. Turn off the gas flow to the conventional oven(s), if so equipped. The product temperature must meet the specifications in section 2.5 of this appendix.

3.1.4.1 Test vessel placement. Position the test vessel with water load for the cooking zone under test, selected and prepared as specified in section 3.1.1 of this appendix, in the center of the cooking zone, and as specified in Annex C to IEC 60350-2.

3.1.4.2 Overshoot test. Use the test methods set forth in Section 7.5.2.1 of IEC 60350-2 to determine the target turndown temperature for each cooking zone, Tctarget, in degrees Celsius, as follows.

Tctarget = 93 °C − (Tmax − T70) Where: Tmax is highest recorded temperature value, in degrees Celsius; and T70 is the average recorded temperature between the time 10 seconds before the power is turned off and the time 10 seconds after the power is turned off.

If T70 is within the tolerance of 70 ± 0.5 °C, the target turndown temperature is the highest of 80 °C and the calculated Tctarget, rounded to the nearest integer. If T70 is outside of the tolerance, the overshoot test is considered invalid and must be repeated after allowing the product to return to ambient conditions.

3.1.4.3 Potential simmering setting pre-selection test. The potential simmering setting for each cooking zone may be determined using the potential simmering setting pre-selecting test. If a potential simmering setting is already known, it may be used instead of completing sections 3.1.4.3.1 through 3.1.4.3.4 of this appendix.

3.1.4.3.1 Use the test vessel with water load for the cooking zone under test, selected, prepared, and positioned as specified in sections 3.1.1 and 3.1.4.1 of this appendix. The temperature of the conventional cooking top is not required to meet the specification for the product temperature in section 2.5 of this appendix for the potential simmering setting pre-selection test. Operate the cooking zone under test with the lowest available power setting. Measure the energy consumption for 10 minutes ±2 seconds.

3.1.4.3.2 Calculate the power density of the power setting, j, on a conventional electric cooking top, Qej, in watts per square centimeter, as:

Where: a = the surface area of the test vessel bottom, in square centimeters; and Ej = the electrical energy consumption during the 10-minute test, in Wh.

3.1.4.3.3 Calculate the power density of the power setting, j, on a conventional gas cooking top, Qgj, in Btu/h per square centimeter, as:

Where: a = the surface area of the test vessel bottom, in square centimeters; Vj = the volume of gas consumed during the 10-minute test, in cubic feet; CF = the gas correction factor to standard temperature and pressure, as calculated in section 4.1.1.2.1 of this appendix; H = either Hn or Hp, the heating value of the gas used in the test as specified in sections 2.2.2.1 and 2.2.2.2 of this appendix, in Btu per standard cubic foot of gas; Eej = the electrical energy consumption of the conventional gas cooking top during the 10-minute test, in Wh; and Ke = 3.412 Btu/Wh, conversion factor of watt-hours to Btu.

3.1.4.3.4 Repeat the measurement for each successively higher power setting until Qej exceeds 0.8 W/cm 2 for conventional electric cooking tops or Qgj exceeds 4.0 Btu/h·cm 2 for conventional gas cooking tops.

For conventional cooking tops with rotating knobs for selecting the power setting, the selection knob shall be turned to the maximum power setting in between each test, to avoid hysteresis. The selection knob shall be turned in the direction from higher power to lower power to select the power setting for the test. If the appropriate power setting is passed, the selection knob shall be turned to the maximum power setting again before repeating the power setting selection.

Of the last two power settings tested, the potential simmering setting is the power setting that produces a power density closest to 0.8 W/cm 2 for conventional electric cooking tops or 4.0 Btu/h·cm 2 for conventional gas cooking tops. The closest power density may be higher or lower than the applicable threshold value.

3.1.4.4 Simmering test. The product temperature must meet the specifications in section 2.5 of this appendix at the start of each simmering test. For each cooking zone, conduct the test method specified in Section 7.5.2 of IEC 60350-2, using the potential simmering setting identified in section 3.1.4.3 of this appendix for the initial simmering setting used in Section 7.5.2.2 of IEC 60350-2.

For conventional cooking tops with rotating knobs for selecting the power setting, the selection knob shall be turned in the direction from higher power to lower power to select the potential simmering setting for the test, to avoid hysteresis. If the appropriate setting is passed, the test is considered invalid and must be repeated after allowing the product to return to ambient conditions.

3.1.4.5 Evaluation of the simmering test. Evaluate the test conducted under section 3.1.4.4 of this appendix as set forth in Section 7.5.4.1 of IEC 60350-2 according to Figure 3.1.4.5 of this appendix. If the measured turndown temperature, Tc, is not within -0.5 °C and +1 °C of the target turndown temperature, Tctarget, the test is considered invalid and must be repeated after allowing the product to return to ambient conditions.

3.2 Standby mode and off mode power. Establish the standby mode and off mode testing conditions set forth in section 2 of this appendix. For products that take some time to enter a stable state from a higher power state as discussed in Section 5, Paragraph 5.1, Note 1 of IEC 62301 (Second Edition), allow sufficient time for the product to reach the lower power state before proceeding with the test measurement. Follow the test procedure as specified in Section 5, Paragraph 5.3.2 of IEC 62301 (Second Edition) for testing in each possible mode as described in sections 3.2.1 and 3.2.2 of this appendix. For units in which power varies as a function of displayed time in standby mode, set the clock time to 3:23 at the end of an initial stabilization period, as specified in Section 5, Paragraph 5.3 of IEC 62301 (First Edition). After an additional 10-minute stabilization period, measure the power use for a single test period of 10 minutes +0/−2 seconds that starts when the clock time first reads 3:33. Use the average power approach described in Section 5, Paragraph 5.3.2(a) of IEC 62301 (First Edition).

3.2.1 If the product has an inactive mode, as defined in section 1 of this appendix, measure the average inactive mode power, PIA, in watts.

3.2.2 If the product has an off mode, as defined in section 1 of this appendix, measure the average off mode power, POM, in watts.

3.3 Recorded values.

3.3.1 Active mode.

3.3.1.1 For a conventional gas cooking top tested with natural gas, record the natural gas higher heating value in Btu per standard cubic foot, Hn, as determined in section 2.2.2.1 of this appendix for the natural gas supply, for each test. For a conventional gas cooking top tested with propane, record the propane higher heating value in Btu per standard cubic foot, Hp, as determined in section 2.2.2.2 of this appendix for the propane supply, for each test.

3.3.1.2 Record the test room temperature in degrees Celsius and relative air pressure in hectopascals (hPa) during each test.

3.3.1.3 Per-cooking zone energy consumption test.

3.3.1.3.1 Record the product temperature in degrees Celsius, TP, prior to the start of each overshoot test or simmering test, as determined in section 2.5 of this appendix.

3.3.1.3.2 Overshoot test. For each cooking zone, record the initial temperature of the water in degrees Celsius, Ti; the average water temperature between the time 10 seconds before the power is turned off and the time 10 seconds after the power is turned off in degrees Celsius, T70; the highest recorded water temperature in degrees Celsius, Tmax; and the target turndown temperature in degrees Celsius, Tctarget.

3.3.1.3.3 Simmering test. For each cooking zone, record the temperature of the water throughout the test, in degrees Celsius, and the values in sections 3.3.1.3.3.1 through 3.3.1.3.3.7 of this appendix for the Energy Test Cycle, if an Energy Test Cycle is measured in section 3.1.4.5 of this appendix, otherwise for both the maximum-below-threshold power setting and the minimum-above-threshold power setting. Because t90 may not be known until completion of the simmering test, water temperature, any electrical energy consumption, and any gas volumetric consumption measurements may be recorded for several minutes after the end of the simmering period to ensure that the full simmering period is recorded.

3.3.1.3.3.1 The power setting under test.

3.3.1.3.3.2 The initial temperature of the water, in degrees Celsius, Ti.

3.3.1.3.3.3 The time at which the tester begins adjusting the cooking top control to change the power setting, to the nearest second, tc and the turndown temperature, in degrees Celsius, Tc.

3.3.1.3.3.4 The time at which the simmering period starts, to the nearest second, t90.

3.3.1.3.3.5 The time at which the simmering period ends, to the nearest second, tS and the smoothened water temperature at the end of the simmering period, in degrees Celsius, TS.

3.3.1.3.3.6 For a conventional electric cooking top, the electrical energy consumption from the start of the test to tS, E, in watt-hours.

3.3.1.3.3.7 For a conventional gas cooking top, the volume of gas consumed from the start of the test to tS, V, in cubic feet of gas; and any electrical energy consumption of the cooking top from the start of the test to tS, Ee, in watt-hours.

3.3.2 Standby mode and off mode. Make measurements as specified in section 3.2 of this appendix. If the product is capable of operating in inactive mode, as defined in section 1 of this appendix, record the average inactive mode power, PIA, in watts as specified in section 3.2.1 of this appendix. If the product is capable of operating in off mode, as defined in section 1 of this appendix, record the average off mode power, POM, in watts as specified in section 3.2.2 of this appendix.

4. Calculation of Derived Results From Test Measurements

4.1. Active mode energy consumption of conventional cooking tops and any conventional cooking top component of a combined cooking product.

4.1.1 Per-cycle active mode energy consumption of a conventional cooking top and any conventional cooking top component of a combined cooking product.

4.1.1.1 Conventional electric cooking top per-cycle active mode energy consumption.

4.1.1.1.1 Conventional electric cooking top per-cooking zone normalized active mode energy consumption. For each cooking zone, calculate the per-cooking zone normalized active mode energy consumption of a conventional electric cooking top, E, in watt-hours, using the following equation:

E = EETC for cooking zones where an Energy Test Cycle was measured in section 3.1.4.5 of this appendix, and for cooking zones where a minimum-above-threshold cycle and a maximum-below-threshold cycle were measured in section 3.1.4.5 of this appendix. Where: EETC = the electrical energy consumption of the Energy Test Cycle from the start of the test to the end of the test for the cooking zone, as determined in section 3.1.4.5 of this appendix, in watt-hours; EMAT = the electrical energy consumption of the minimum-above-threshold power setting from the start of the test to the end of the test for the cooking zone, as determined in section 3.1.4.5 of this appendix, in watt-hours; EMBT = the electrical energy consumption of the maximum-below-threshold power setting from the start of the test to the end of the test for the cooking zone, as determined in section 3.1.4.5 of this appendix, in watt-hours; TS,MAT = the smoothened water temperature at the end of the minimum-above-threshold power setting test for the cooking zone, in degrees Celsius; and TS,MBT = the smoothened water temperature at the end of the maximum-below-threshold power setting test for the cooking zone, in degrees Celsius.

4.1.1.1.2 Calculate the per-cycle active mode total energy consumption of a conventional electric cooking top, ECET, in watt-hours, using the following equation:

Where: n = the total number of cooking zones tested on the conventional cooking top; Ez = the normalized energy consumption representative of the Energy Test Cycle for each cooking zone, as calculated in section 4.1.1.1.1 of this appendix, in watt-hours; mz is the mass of water used for each cooking zone, in grams; and 2853 = the representative water load mass, in grams.

4.1.1.2 Conventional gas cooking top per-cycle active mode energy consumption.

4.1.1.2.1 Gas correction factor to standard temperature and pressure. Calculate the gas correction factor to standard temperature and pressure, which converts between standard cubic feet and measured cubic feet of gas for a given set of test conditions:

Where: Pgas = the measured line gas gauge pressure, in inches of water column; 0.0361= the conversion factor from inches of water column to pounds per square inch; Patm = the measured atmospheric pressure, in pounds per square inch; Pbase = 14.73 pounds per square inch, the standard sea level air pressure; Tbase = 519.67 degrees Rankine (or 288.7 Kelvin); Tgas = the measured line gas temperature, in degrees Fahrenheit (or degrees Celsius); and Tk = the adder converting from degrees Fahrenheit to degrees Rankine, 459.7 (or from degrees Celsius to Kelvin, 273.16).

4.1.1.2.2 Conventional gas cooking top per-cooking zone normalized active mode gas energy consumption. For each cooking zone, calculate the per-cooking zone normalized active mode gas energy consumption of a conventional gas cooking top, Eg, in Btu, using the following equation:

Eg = Egt,ETC for cooking zones where an Energy Test Cycle was measured in section 3.1.4.5 of this appendix, and for cooking zones where a minimum-above-threshold cycle and a maximum-below-threshold cycle were measured in section 3.1.4.5 of this appendix. Where: Egt,ETC = the as-tested gas energy consumption of the Energy Test Cycle for the cooking zone, in Btu, calculated as the product of: V, the gas consumption of the Energy Test Cycle, as determined in section 3.1.4.5 of this appendix, in cubic feet; CF, the gas correction factor to standard temperature and pressure for the test, as calculated in section 4.1.1.2.1 of this appendix; and H, either Hn or Hp, the heating value of the gas used in the test as specified in sections 2.2.2.1 and 2.2.2.2 of this appendix, expressed in Btu per standard cubic foot of gas; Egt,MAT = the as-tested gas energy consumption of the minimum-above-threshold power setting for the cooking zone, in Btu, calculated as the product of: V, the gas consumption of the minimum-above-threshold power setting, as determined in section 3.1.4.5 of this appendix, in cubic feet; CF, the gas correction factor to standard temperature and pressure for the test, as calculated in section 4.1.1.2.1 of this appendix; and H, either Hn or Hp, the heating value of the gas used in the test as specified in sections 2.2.2.1 and 2.2.2.2 of this appendix, expressed in Btu per standard cubic foot of gas; Egt,MBT = the as-tested gas energy consumption of the maximum-below-threshold power setting for the cooking zone, in Btu, calculated as the product of: V, the gas consumption of the maximum-below-threshold power setting, as determined in section 3.1.4.5 of this appendix, in cubic feet; CF, the gas correction factor to standard temperature and pressure for the test, as calculated in section 4.1.1.2.1 of this appendix; and H, either Hn or Hp, the heating value of the gas used in the test as specified in sections 2.2.2.1 and 2.2.2.2 of this appendix, expressed in Btu per standard cubic foot of gas; TS,MAT = the smoothened water temperature at the end of the minimum-above-threshold power setting test for the cooking zone, in degrees Celsius; and TS,MBT = the smoothened water temperature at the end of the maximum-below-threshold power setting test for the cooking zone, in degrees Celsius.

4.1.1.2.3 Conventional gas cooking top per-cooking zone active mode normalized electrical energy consumption. For each cooking zone, calculate the per-cooking zone normalized active mode electrical energy consumption of a conventional gas cooking top, Ee, in watt-hours, using the following equation:

Ee = Ee,ETC for cooking zones where an Energy Test Cycle was measured in section 3.1.4.5 of this appendix, and for cooking zones where a minimum-above-threshold cycle and a maximum-below-threshold cycle were measured in section 3.1.4.5 of this appendix. Where: Ee,ETC = the electrical energy consumption of the Energy Test Cycle from the start of the test to the end of the test for the cooking zone, as determined in section 3.1.4.5 of this appendix, in watt-hours; Ee,MAT = the electrical energy consumption of the minimum-above-threshold power setting from the start of the test to the end of the test for the cooking zone, as determined in section 3.1.4.5 of this appendix, in watt-hours; Ee,MBT = the electrical energy consumption of the maximum-below-threshold power setting from the start of the test to the end of the test for the cooking zone, as determined in section 3.1.4.5 of this appendix, in watt-hours; TS,MAT = the smoothened water temperature at the end of the minimum-above-threshold power setting test for the cooking zone, in degrees Celsius; and TS,MBT = the smoothened water temperature at the end of the maximum-below-threshold power setting test for the cooking zone, in degrees Celsius.

4.1.1.2.4 Conventional gas cooking top per-cycle active mode gas energy consumption. Calculate the per-cycle active mode gas energy consumption of a conventional gas cooking top, ECGG, in Btu, using the following equation:

Where: n, mz, and 2853 are defined in section 4.1.1.1.2 of this appendix; and Egz = the normalized gas energy consumption representative of the Energy Test Cycle for each cooking zone, as calculated in section 4.1.1.2.2 of this appendix, in Btu.

4.1.1.2.5 Conventional gas cooking top per-cycle active mode electrical energy consumption. Calculate the per-cycle active mode electrical energy consumption of a conventional gas cooking top, ECGE, in watt-hours, using the following equation:

Where: n, mz, and 2853 are defined in section 4.1.1.1.2 of this appendix; and Eez = the normalized electrical energy consumption representative of the Energy Test Cycle for each cooking zone, as calculated in section 4.1.1.2.3 of this appendix, in watt-hours.

4.1.1.2.6 Conventional gas cooking top per-cycle active-mode total energy consumption. Calculate the per-cycle active mode total energy consumption of a conventional gas cooking top, ECGT, in Btu, using the following equation:

ECGT = ECGG + (ECGE × Ke) Where: ECGG = the per-cycle active mode gas energy consumption of a conventional gas cooking top as determined in section 4.1.1.2.4 of this appendix, in Btu; ECGE = the per-cycle active mode electrical energy consumption of a conventional gas cooking top as determined in section 4.1.1.2.5 of this appendix, in watt-hours; and Ke = 3.412 Btu/Wh, conversion factor of watt-hours to Btu.

4.1.2 Annual active mode energy consumption of a conventional cooking top and any conventional cooking top component of a combined cooking product.

4.1.2.1 Conventional electric cooking top annual active mode energy consumption. Calculate the annual active mode total energy consumption of a conventional electric cooking top, EAET, in kilowatt-hours per year, using the following equation:

EAET = ECET × K × NC Where: ECET = the conventional electric cooking top per-cycle active mode total energy consumption, as determined in section 4.1.1.1.2 of this appendix, in watt-hours; K = 0.001 kWh/Wh conversion factor for watt-hours to kilowatt-hours; and NC = 418 cooking cycles per year, the average number of cooking cycles per year normalized for duration of a cooking event estimated for conventional cooking tops.

4.1.2.2 Conventional gas cooking top annual active mode energy consumption.

4.1.2.2.1 Conventional gas cooking top annual active mode gas energy consumption. Calculate the annual active mode gas energy consumption of a conventional gas cooking top, EAGG, in kBtu per year, using the following equation:

EAGG = ECGG × K × NC Where: K and NC are defined in section 4.1.2.1 of this appendix; and ECGG = the conventional gas cooking top per-cycle active mode gas energy consumption, as determined in section 4.1.1.2.4 of this appendix, in Btu.

4.1.2.2.2 Conventional gas cooking top annual active mode electrical energy consumption. Calculate the annual active mode electrical energy consumption of a conventional gas cooking top, EAGE, in kilowatt-hours per year, using the following equation:

EAGE = ECGE × K × NC Where: K and NC are defined in section 4.1.2.1 of this appendix; and ECGE = the conventional gas cooking top per-cycle active mode electrical energy consumption, as determined in section 4.1.1.2.5 of this appendix, in watt-hours.

4.1.2.2.3 Conventional gas cooking top annual active mode total energy consumption. Calculate the annual active mode total energy consumption of a conventional gas cooking top, EAGT, in kBtu per year, using the following equation:

EAGT = EAGG + (EAGE × Ke) Where: EAGG = the conventional gas cooking top annual active mode gas energy consumption as determined in section 4.1.2.2.1 of this appendix, in kBtu per year; EAGE = the conventional gas cooking top annual active mode electrical energy consumption as determined in section 4.1.2.2.2 of this appendix, in kilowatt-hours per year; and Ke is defined in section 4.1.1.2.6 of this appendix.

4.2 Annual combined low-power mode energy consumption of a conventional cooking top and any conventional cooking top component of a combined cooking product.

4.2.1 Conventional cooking top annual combined low-power mode energy consumption. Calculate the annual combined low-power mode energy consumption for a conventional cooking top, ETLP, in kilowatt-hours per year, using the following equation:

ETLP = [(PIA × FIA) + (POM × FOM)] × K × ST Where: PIA = inactive mode power, in watts, as measured in section 3.2.1 of this appendix; POM = off mode power, in watts, as measured in section 3.2.2 of this appendix; FIA and FOM are the portion of annual hours spent in inactive mode and off mode hours respectively, as defined in Table 4.2.1 of this appendix; K = 0.001 kWh/Wh conversion factor for watt-hours to kilowatt-hours; and ST = 8,544, total number of inactive mode and off mode hours per year for a conventional cooking top.

4.2.2 Conventional cooking top component of a combined cooking product annual combined low-power mode energy consumption. Calculate the annual combined low-power mode energy consumption for the conventional cooking top component of a combined cooking product, ETLP, in kilowatt-hours per year, using the following equation:

ETLP = [(PIA × FIA) + (POM × FOM)] × K × STOT × HC Where: PIA, POM, FIA, FOM, and K are defined in section 4.2.1 of this appendix; STOT = the total number of inactive mode and off mode hours per year for a combined cooking product, as defined in Table 4.2.2 of this appendix; and HC = the percentage of hours per year assigned to the conventional cooking top component of a combined cooking product, as defined in Table 4.2.2 of this appendix.

4.3 Integrated annual energy consumption of a conventional cooking top and any conventional cooking top component of a combined cooking product.

4.3.1 Conventional electric cooking top integrated annual energy consumption. Calculate the integrated annual energy consumption, IAEC, of a conventional electric cooking top, in kilowatt-hours per year, using the following equation:

IAEC = EAET + ETLP Where: EAET = the conventional electric cooking top annual active mode energy consumption, as determined in section 4.1.2.1 of this appendix; and ETLP = the annual combined low-power mode energy consumption of a conventional cooking top or any conventional cooking top component of a combined cooking product, as determined in section 4.2 of this appendix.

4.3.2 Conventional gas cooking top integrated annual energy consumption. Calculate the integrated annual energy consumption, IAEC, of a conventional gas cooking top, in kBtu per year, defined as:

IAEC = EAGT + (ETLP × Ke)

Where: EAGT = the conventional gas cooking top annual active mode total energy consumption, as determined in section 4.1.2.2.3 of this appendix; ETLP = the annual combined low-power mode energy consumption of a conventional cooking top or any conventional cooking top component of a combined cooking product, as determined in section 4.2 of this appendix; and Ke is defined in section 4.1.1.2.6 of this appendix. [87 FR 51538, Aug. 22, 2022, as amended at 88 FR 7847, Feb. 7, 2023]

Note:

Manufacturers must use the results of testing under Appendix J2 to determine compliance with the relevant standards for clothes washers from § 430.32(g)(4) and from § 431.156(b) as they appeared in January 1, 2022 edition of 10 CFR parts 200-499. Specifically, before November 28, 2022 representations must be based upon results generated either under Appendix J2 as codified on July 1, 2022 or under Appendix J2 as it appeared in the 10 CFR parts 200-499 edition revised as of January 1, 2022. Any representations made on or after November 28, 2022 but before the compliance date of any amended standards for clothes washers must be made based upon results generated using Appendix J2 as codified on July 1, 2022.

Manufacturers must use the results of testing under this appendix to determine compliance with any amended standards for clothes washers provided in § 430.32(g) and in § 431.156 that are published after January 1, 2022. Any representations related to energy or water consumption of residential or commercial clothes washers must be made in accordance with the appropriate appendix that applies (i.e., this appendix or Appendix J2) when determining compliance with the relevant standard. Manufacturers may also use this appendix to certify compliance with any amended standards prior to the applicable compliance date for those standards.

0. Incorporation by Reference

DOE incorporated by reference in § 430.3, the entire test standard for IEC 62301. However, only enumerated provisions of this standard are applicable to this appendix, as follows. In cases in which there is a conflict, the language of the test procedure in this appendix takes precedence over the referenced test standard.

0.1 IEC 62301:

(a) Section 4.2 as referenced in section 2.4 of this appendix;

(b) Section 4.3.2 as referenced in section 2.1.2 of this appendix;

(c) Section 4.4 as referenced in section 2.5.3 of this appendix;

(d) Section 5.1 as referenced in section 3.5.2 of this appendix;

(e) Section 5.2 as referenced in section 2.10.2 of this appendix; and

(f) Section 5.3.2 as referenced in section 3.5.3 of this appendix.

0.2 [Reserved]

1. Definitions

Active mode means a mode in which the clothes washer is connected to a mains power source, has been activated, and is performing one or more of the main functions of washing, soaking, tumbling, agitating, rinsing, and/or removing water from the clothing, or is involved in functions necessary for these main functions, such as admitting water into the washer or pumping water out of the washer. Active mode also includes delay start and cycle finished modes.

Active-mode energy efficiency ratio means the quotient of the weighted-average load size divided by the total clothes washer energy consumption per cycle, with such energy consumption expressed as the sum of the machine electrical energy consumption, the hot water energy consumption, and the energy required for removal of the remaining moisture in the wash load.

Active washing mode means a mode in which the clothes washer is performing any of the operations included in a complete cycle intended for washing a clothing load, including the main functions of washing, soaking, tumbling, agitating, rinsing, and/or removing water from the clothing.

Bone-dry means a condition of a load of test cloth that has been dried in a dryer at maximum temperature for a minimum of 10 minutes, removed and weighed before cool down, and then dried again for 10 minute periods until the final weight change of the load is 1 percent or less.

Clothes container means the compartment within the clothes washer that holds the clothes during the operation of the machine.

Cold rinse means the coldest rinse temperature available on the machine, as indicated to the user on the clothes washer control panel.

Combined low-power mode means the aggregate of available modes other than active washing mode, including inactive mode, off mode, delay start mode, and cycle finished mode.

Cycle finished mode means an active mode that provides continuous status display, intermittent tumbling, or air circulation following operation in active washing mode.

Delay start mode means an active mode in which activation of active washing mode is facilitated by a timer.

Energy efficiency ratio means the quotient of the weighted-average load size divided by the total clothes washer energy consumption per cycle, with such energy consumption expressed as the sum of:

(a) The machine electrical energy consumption;

(b) The hot water energy consumption;

(c) The energy required for removal of the remaining moisture in the wash load; and

(d) The combined low-power mode energy consumption.

Energy test cycle means the complete set of wash/rinse temperature selections required for testing, as determined according to section 2.12 of this appendix.

Fixed water fill control system means a clothes washer water fill control system that automatically terminates the fill when the water reaches a pre-defined level that is not based on the size or weight of the clothes load placed in the clothes container, without allowing or requiring the user to determine or select the water fill level.

Inactive mode means a standby mode that facilitates the activation of active mode by remote switch (including remote control), internal sensor, or timer, or that provides continuous status display.

Load usage factor means the percentage of the total number of wash loads that a user would wash a particular size (weight) load.

Lot means a quantity of cloth that has been manufactured with the same batches of cotton and polyester during one continuous process.

Manual water fill control system means a clothes washer water fill control system that requires the user to determine or select the water fill level.

Non-user-adjustable adaptive water fill control system means a clothes washer water fill control system that is capable of automatically adjusting the water fill level based on the size or weight of the clothes load placed in the clothes container.

Normal cycle means the cycle recommended by the manufacturer (considering manufacturer instructions, control panel labeling, and other markings on the clothes washer) for normal, regular, or typical use for washing up to a full load of normally soiled cotton clothing. For machines where multiple cycle settings are recommended by the manufacturer for normal, regular, or typical use for washing up to a full load of normally soiled cotton clothing, then the Normal cycle is the cycle selection that results in the lowest EER or AEER value.

Off mode means a mode in which the clothes washer is connected to a mains power source and is not providing any active or standby mode function, and where the mode may persist for an indefinite time.

Standby mode means any mode in which the clothes washer is connected to a mains power source and offers one or more of the following user oriented or protective functions that may persist for an indefinite time:

(a) Facilitating the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer;

(b) Continuous functions, including information or status displays (including clocks) or sensor-based functions.

A timer is a continuous clock function (which may or may not be associated with a display) that provides regular scheduled tasks (e.g., switching) and that operates on a continuous basis.

Temperature use factor means, for a particular wash/rinse temperature setting, the percentage of the total number of wash loads that an average user would wash with that setting.

User-adjustable adaptive water fill control system means a clothes washer fill control system that allows the user to adjust the amount of water that the machine provides, which is based on the size or weight of the clothes load placed in the clothes container.

Wash time means the wash portion of active washing mode, which begins when the cycle is initiated and includes the agitation or tumble time, which may be periodic or continuous during the wash portion of active washing mode.

Water efficiency ratio means the quotient of the weighted-average load size divided by the total weighted per-cycle water consumption for all wash cycles in gallons.

2. Testing Conditions and Instrumentation

2.1 Electrical energy supply.

2.1.1 Supply voltage and frequency. Maintain the electrical supply at the clothes washer terminal block within 2 percent of 120, 120/240, or 120/208Y volts as applicable to the particular terminal block wiring system and within 2 percent of the nameplate frequency as specified by the manufacturer. If the clothes washer has a dual voltage conversion capability, conduct test at the highest voltage specified by the manufacturer.

2.1.2 Supply voltage waveform. For the combined low-power mode testing, maintain the electrical supply voltage waveform indicated in Section 4, Paragraph 4.3.2 of IEC 62301. If the power measuring instrument used for testing is unable to measure and record the total harmonic content during the test measurement period, total harmonic content may be measured and recorded immediately before and after the test measurement period.

2.2 Supply water. Maintain the temperature of the hot water supply at the water inlets between 120 °F (48.9 °C) and 125 °F (51.7 °C), targeting the midpoint of the range. Maintain the temperature of the cold water supply at the water inlets between 55 °F (12.8 °C) and 60 °F (15.6 °C), targeting the midpoint of the range.

2.3 Water pressure. Maintain the static water pressure at the hot and cold water inlet connection of the clothes washer at 35 pounds per square inch gauge (psig) ± 2.5 psig (241.3 kPa ± 17.2 kPa) when the water is flowing.

2.4 Test room temperature. For all clothes washers, maintain the test room ambient air temperature at 75 ± 5 °F (23.9 ± 2.8 °C) for active mode testing and combined low-power mode testing. Do not use the test room ambient air temperature conditions specified in Section 4, Paragraph 4.2 of IEC 62301 for combined low-power mode testing.

2.5 Instrumentation. Perform all test measurements using the following instruments, as appropriate:

2.5.1 Weighing scales.

2.5.1.1 Weighing scale for test cloth. The scale used for weighing test cloth must have a resolution of no larger than 0.2 oz (5.7 g) and a maximum error no greater than 0.3 percent of the measured value.

2.5.1.2 Weighing scale for clothes container capacity measurement. The scale used for performing the clothes container capacity measurement must have a resolution no larger than 0.50 lbs (0.23 kg) and a maximum error no greater than 0.5 percent of the measured value.

2.5.2 Watt-hour meter. The watt-hour meter used to measure electrical energy consumption must have a resolution no larger than 1 Wh (3.6 kJ) and a maximum error no greater than 2 percent of the measured value for any demand greater than 50 Wh (180.0 kJ).

2.5.3 Watt meter. The watt meter used to measure combined low-power mode power consumption must comply with the requirements specified in Section 4, Paragraph 4.4 of IEC 62301. If the power measuring instrument used for testing is unable to measure and record the crest factor, power factor, or maximum current ratio during the test measurement period, the crest factor, power factor, and maximum current ratio may be measured and recorded immediately before and after the test measurement period.

2.5.4 Water and air temperature measuring devices. The temperature devices used to measure water and air temperature must have an error no greater than ±1 °F (±0.6 °C) over the range being measured.

2.5.4.1 Non-reversible temperature indicator labels, adhered to the inside of the clothes container, may be used to confirm that an extra-hot wash temperature greater than or equal to 140 °F has been achieved during the wash cycle, under the following conditions. The label must remain waterproof, intact, and adhered to the wash drum throughout an entire wash cycle; provide consistent maximum temperature readings; and provide repeatable temperature indications sufficient to demonstrate that a wash temperature of greater than or equal to 140 °F has been achieved. The label must have been verified to consistently indicate temperature measurements with an accuracy of ±1 °F. If using a temperature indicator label to test a front-loading clothes washer, adhere the label along the interior surface of the clothes container drum, midway between the front and the back of the drum, adjacent to one of the baffles. If using a temperature indicator label to test a top-loading clothes washer, adhere the label along the interior surface of the clothes container drum, on the vertical portion of the sidewall, as close to the bottom of the container as possible.

2.5.4.2 Submersible temperature loggers placed inside the wash drum may be used to confirm that an extra-hot wash temperature greater than or equal to 140 °F has been achieved during the wash cycle, under the following conditions. The submersible temperature logger must have a time resolution of at least 1 data point every 5 seconds and a temperature measurement accuracy of ±1 °F. Due to the potential for a waterproof capsule to provide a thermal insulating effect, failure to measure a temperature of 140 °F does not necessarily indicate the lack of an extra-hot wash temperature. However, such a result would not be conclusive due to the lack of verification of the water temperature requirement, in which case an alternative method must be used to confirm that an extra-hot wash temperature greater than or equal to 140 °F has been achieved during the wash cycle.

2.5.5 Water meter. A water meter must be installed in both the hot and cold water lines to measure water flow and/or water consumption. The water meters must have a resolution no larger than 0.1 gallons (0.4 liters) and a maximum error no greater than 2 percent for the water flow rates being measured. If the volume of hot water for any individual cycle within the energy test cycle is less than 0.1 gallons (0.4 liters), the hot water meter must have a resolution no larger than 0.01 gallons (0.04 liters).

2.5.6 Water pressure gauge. A water pressure gauge must be installed in both the hot and cold water lines to measure water pressure. The water pressure gauges must have a resolution of 1 pound per square inch gauge (psig) (6.9 kPa) and a maximum error no greater than 5 percent of any measured value.

2.6 Bone-dryer. The dryer used for drying the cloth to bone-dry must heat the test cloth load above 210 °F (99 °C).

2.7 Test cloths. The test cloth material and dimensions must conform to the specifications in appendix J3 to this subpart. The energy test cloth and the energy stuffer cloths must be clean and must not be used for more than 60 test runs (after preconditioning as specified in section 5 of appendix J3 to this subpart). All energy test cloth must be permanently marked identifying the lot number of the material. Mixed lots of material must not be used for testing a clothes washer. The moisture absorption and retention must be evaluated for each new lot of test cloth using the standard extractor Remaining Moisture Content (RMC) procedure specified in appendix J3 to this subpart.

2.8 Test Loads.

2.8.1 Test load sizes. Create small and large test loads as defined in Table 5.1 of this appendix based on the clothes container capacity as measured in section 3.1 of this appendix. Record the bone-dry weight for each test load.

2.8.2 Test load composition. Test loads must consist primarily of energy test cloths and no more than five energy stuffer cloths per load to achieve the proper weight.

2.9 Preparation and loading of test loads. Use the following procedures to prepare and load each test load for testing in section 3 of this appendix.

2.9.1 Test loads for energy and water consumption measurements must be bone-dry prior to the first cycle of the test, and dried to a maximum of 104 percent of bone-dry weight for subsequent testing.

2.9.2 Prepare the energy test cloths for loading by grasping them in the center, lifting, and shaking them to hang loosely, as illustrated in Figure 2.9.2 of this appendix.

For all clothes washers, follow any manufacturer loading instructions provided to the user regarding the placement of clothing within the clothes container. In the absence of any manufacturer instructions regarding the placement of clothing within the clothes container, the following loading instructions apply.

2.9.2.1 To load the energy test cloths in a top-loading clothes washer, arrange the cloths circumferentially around the axis of rotation of the clothes container, using alternating lengthwise orientations for adjacent pieces of cloth. Complete each cloth layer across its horizontal plane within the clothes container before adding a new layer. Figure 2.9.2.1 of this appendix illustrates the correct loading technique for a vertical-axis clothes washer.

2.9.2.2 To load the energy test cloths in a front-loading clothes washer, grasp each test cloth in the center as indicted in section 2.9.2 of this appendix, and then place each cloth into the clothes container prior to activating the clothes washer.

2.10 Clothes washer installation. Install the clothes washer in accordance with manufacturer's instructions.

2.10.1 Water inlet connections. If the clothes washer has 2 water inlets, connect the inlets to the hot water and cold water supplies, in accordance with the manufacturer's instructions. If the clothes washer has only 1 water inlet, connect the inlet to the cold water supply, in accordance with the manufacturer's instructions. Use the water inlet hoses provided with the clothes washer; otherwise use commercially available water inlet hoses, not to exceed 72 inches in length, in accordance with manufacturer's instructions.

2.10.2 Low-power mode testing. For combined low-power mode testing, install the clothes washer in accordance with Section 5, Paragraph 5.2 of IEC 62301, disregarding the provisions regarding batteries and the determination, classification, and testing of relevant modes.

2.11 Clothes washer pre-conditioning. If the clothes washer has not been filled with water in the preceding 96 hours, or if it has not been in the test room at the specified ambient conditions for 8 hours, pre-condition it by running it through a cold rinse cycle and then draining it to ensure that the hose, pump, and sump are filled with water.

2.12 Determining the energy test cycle.

2.12.1 Automatic clothes washers. To determine the energy test cycle, evaluate the wash/rinse temperature selection flowcharts in the order in which they are presented in this section. Use the large load size to evaluate each flowchart. The determination of the energy test cycle must take into consideration all cycle settings available to the end user, including any cycle selections or cycle modifications provided by the manufacturer via software or firmware updates to the product, for the basic model under test. The energy test cycle does not include any cycle that is recommended by the manufacturer exclusively for cleaning, deodorizing, or sanitizing the clothes washer.

2.12.2. Semi-automatic clothes washers. The energy test cycle for semi-automatic clothes washers includes only the Cold Wash/Cold Rinse (“Cold”) test cycle. Energy and water use for all other wash/rinse temperature combinations are calculated numerically in section 3.4.2 of this appendix.

3. Test Measurements

3.1 Clothes container capacity. Measure the entire volume that a clothes load could occupy within the clothes container during active mode washer operation according to the following procedures:

3.1.1 Place the clothes washer in such a position that the uppermost edge of the clothes container opening is leveled horizontally, so that the container will hold the maximum amount of water. For front-loading clothes washers, the door seal and shipping bolts or other forms of bracing hardware to support the wash drum during shipping must remain in place during the capacity measurement. If the design of a front-loading clothes washer does not include shipping bolts or other forms of bracing hardware to support the wash drum during shipping, a laboratory may support the wash drum by other means, including temporary bracing or support beams. Any temporary bracing or support beams must keep the wash drum in a fixed position, relative to the geometry of the door and door seal components, that is representative of the position of the wash drum during normal operation. The method used must avoid damage to the unit that would affect the results of the energy and water testing. For a front-loading clothes washer that does not include shipping bolts or other forms of bracing hardware to support the wash drum during shipping, the laboratory must fully document the alternative method used to support the wash drum during capacity measurement, include such documentation in the final test report, and pursuant to § 429.71 of this chapter, the manufacturer must retain such documentation as part its test records.

3.1.2 Line the inside of the clothes container with a 2 mil thickness (0.051 mm) plastic bag. All clothes washer components that occupy space within the clothes container and that are recommended for use during a wash cycle must be in place and must be lined with a 2 mil thickness (0.051 mm) plastic bag to prevent water from entering any void space.

3.1.3 Record the total weight of the machine before adding water.

3.1.4 Fill the clothes container manually with either 60 °F ± 5 °F (15.6 °C ± 2.8 °C) or 100 °F ± 10 °F (37.8 °C ± 5.5 °C) water, with the door open. For a top-loading vertical-axis clothes washer, fill the clothes container to the uppermost edge of the rotating portion, including any balance ring. Figure 3.1.4.1 of this appendix illustrates the maximum fill level for top-loading clothes washers.

For a front-loading horizontal-axis clothes washer, fill the clothes container to the highest point of contact between the door and the door gasket. If any portion of the door or gasket would occupy the measured volume space when the door is closed, exclude from the measurement the volume that the door or gasket portion would occupy. For a front-loading horizontal-axis clothes washer with a concave door shape, include any additional volume above the plane defined by the highest point of contact between the door and the door gasket, if that area can be occupied by clothing during washer operation. For a top-loading horizontal-axis clothes washer, include any additional volume above the plane of the door hinge that clothing could occupy during washer operation. Figure 3.1.4.2 of this appendix illustrates the maximum fill volumes for all horizontal-axis clothes washer types.

For all clothes washers, exclude any volume that cannot be occupied by the clothing load during operation.

3.1.5 Measure and record the weight of water, W, in pounds.

3.1.6 Calculate the clothes container capacity as follows:

C = W/d Where: C = Capacity in cubic feet (liters). W = Mass of water in pounds (kilograms). d = Density of water (62.0 lbs/ft 3 for 100 °F (993 kg/m 3 for 37.8 °C) or 62.3 lbs/ft 3 for 60 °F (998 kg/m 3 for 15.6 °C)).

3.1.7 Calculate the clothes container capacity, C, to the nearest 0.01 cubic foot for the purpose of determining test load sizes per Table 5.1 of this appendix and for all subsequent calculations that include the clothes container capacity.

3.2 Cycle settings.

3.2.1 Wash/rinse temperature selection. For automatic clothes washers, set the wash/rinse temperature selection control to obtain the desired wash/rinse temperature selection within the energy test cycle.

3.2.2 Wash time setting.

3.2.2.1 If the cycle under test offers a range of wash time settings, the wash time setting shall be the higher of either the minimum or 70 percent of the maximum wash time available for the wash cycle under test, regardless of the labeling of suggested dial locations. If 70 percent of the maximum wash time is not available on a dial with a discrete number of wash time settings, choose the next-highest setting greater than 70 percent.

3.2.2.2 If the clothes washer is equipped with an electromechanical dial or timer controlling wash time that rotates in both directions, reset the dial to the minimum wash time and then turn it in the direction of increasing wash time to reach the appropriate setting. If the appropriate setting is passed, return the dial to the minimum wash time and then turn in the direction of increasing wash time until the appropriate setting is reached.

3.2.3 Water fill level settings. The water fill level settings depend on the clothes washer's water fill control system, as determined in Table 3.2.3.

3.2.3.1 Clothes washers with a manual water fill control system. For the large test load size, set the water fill level selector to the maximum water fill level setting available for the wash cycle under test. If the water fill level selector has two settings available for the wash cycle under test, for the small test load size, select the minimum water fill level setting available for the wash cycle under test.

If the water fill level selector has more than two settings available for the wash cycle under test, for the small test load size, select the second-lowest water fill level setting.

3.2.3.2 Clothes washers with a fixed water fill control system. The water level is automatically determined by the water fill control system.

3.2.3.3 Clothes washers with a user-adjustable adaptive water fill control system. For the large test load size, set the water fill selector to the setting that uses the most water. For the small test load size, set the water fill selector to the setting that uses the least water.

3.2.3.4 Clothes washers with a non-user-adjustable adaptive water fill control system. The water level is automatically determined by the water fill control system.

3.2.3.5 Clothes washers with multiple water fill control systems. If a clothes washer allows user selection among multiple water fill control systems, test all water fill control systems and, for each one, calculate the energy consumption (HET, MET, DET, and ETLP) and water consumption (QT) values as set forth in section 4 of this appendix. Then, calculate the average of the tested values (one from each water fill control system) for each variable (HET, MET, DET, ETLP, and QT) and use the average value for each variable in the final calculations in section 4 of this appendix.

3.2.4 Manufacturer default settings. For clothes washers with electronic control systems, use the manufacturer default settings for any cycle selections, except for (1) the temperature selection, (2) the wash water fill levels, or (3) network settings. If the clothes washer has network capabilities, the network settings must be disabled throughout testing if such settings can be disabled by the end-user and the product's user manual provides instructions on how to do so. For all other cycle selections, the manufacturer default settings must be used for wash conditions such as agitation/tumble operation, soil level, spin speed, wash times, rinse times, optional rinse settings, water heating time for water heating clothes washers, and all other wash parameters or optional features applicable to that wash cycle. Any optional wash cycle feature or setting (other than wash/rinse temperature, water fill level selection, or network settings on clothes washers with network capabilities) that is activated by default on the wash cycle under test must be included for testing unless the manufacturer instructions recommend not selecting this option, or recommend selecting a different option, for washing normally soiled cotton clothing. For clothes washers with control panels containing mechanical switches or dials, any optional settings, except for the temperature selection or the wash water fill levels, must be in the position recommended by the manufacturer for washing normally soiled cotton clothing. If the manufacturer instructions do not recommend a particular switch or dial position to be used for washing normally soiled cotton clothing, the setting switch or dial must remain in its as-shipped position.

3.2.5 For each wash cycle tested, include the entire active washing mode and exclude any delay start or cycle finished modes.

3.2.6 Anomalous Test Cycles. If during a wash cycle the clothes washer: (a) Signals to the user by means of a visual or audio alert that an out-of-balance condition has been detected; or (b) terminates prematurely and thus does not include the agitation/tumble operation, spin speed(s), wash times, and rinse times applicable to the wash cycle under test, discard the test data and repeat the wash cycle. Document in the test report the rejection of data from any wash cycle during testing and the reason for the rejection.

3.3 Test cycles for automatic clothes washers. Perform testing on each wash/rinse temperature selection available in the energy test cycle as defined in section 2.12.1 of this appendix. Test each load size as defined in section 2.8 of this appendix with its associated water fill level defined in section 3.2.3 of this appendix. Assign the bone-dry weight according to the value measured in section 2.8 of this appendix. Place the test load in the clothes washer and initiate the cycle under test. Measure the values for hot water consumption, cold water consumption, electrical energy consumption, and cycle time for the complete cycle. Record the weight of the test load immediately after completion of the cycle. Table 3.3 of this appendix provides the symbol definitions for each measured value.

3.4 Test cycles for semi-automatic clothes washers.

3.4.1 Test Measurements. Perform testing on each wash/rinse temperature selection available in the energy test cycle as defined in section 2.12.2 of this appendix. Test each load size as defined in section 2.8 of this appendix with the associated water fill level defined in section 3.2.3 of this appendix. Assign the bone-dry weight according to the value measured in section 2.8 of this appendix. Place the test load in the clothes washer and initiate the cycle under test. Measure the values for cold water consumption, electrical energy consumption, and cycle time for the complete cycle. Record the weight of the test load immediately after completion of the cycle. Table 3.4.1 of this appendix provides symbol definitions for each measured value for the Cold temperature selection.

3.4.2 Calculation of Hot and Warm measured values. In lieu of testing, the measured values for the Hot and Warm cycles are calculated based on the measured values for the Cold cycle, as defined in section 3.4.1 of this appendix. Table 3.4.2 of this appendix provides the symbol definitions and calculations for each value for the Hot and Warm temperature selections.

3.5 Combined low-power mode power. Connect the clothes washer to a watt meter as specified in section 2.5.3 of this appendix. Establish the testing conditions set forth in sections 2.1, 2.4, and 2.10.2 of this appendix.

3.5.1 Perform combined low-power mode testing after completion of an active mode wash cycle included as part of the energy test cycle; after removing the test load; without changing the control panel settings used for the active mode wash cycle; with the door closed; and without disconnecting the electrical energy supply to the clothes washer between completion of the active mode wash cycle and the start of combined low-power mode testing.

3.5.2 For a clothes washer that takes some time to automatically enter a stable inactive mode or off mode state from a higher power state as discussed in Section 5, Paragraph 5.1, note 1 of IEC 62301, allow sufficient time for the clothes washer to automatically reach the default inactive/off mode state before proceeding with the test measurement.

3.5.3 Once the stable inactive/off mode state has been reached, measure and record the default inactive/off mode power, Pdefault, in watts, following the test procedure for the sampling method specified in Section 5, Paragraph 5.3.2 of IEC 62301.

3.5.4 For a clothes washer with a switch, dial, or button that can be optionally selected by the end user to achieve a lower-power inactive/off mode state than the default inactive/off mode state measured in section 3.5.3 of this appendix, after performing the measurement in section 3.5.3 of this appendix, activate the switch, dial, or button to the position resulting in the lowest power consumption and repeat the measurement procedure described in section 3.5.3 of this appendix. Measure and record the lowest-power inactive/off mode power, Plowest, in Watts.

3.6 Energy consumption for the purpose of determining the cycle selection(s) to be included in the energy test cycle. This section is implemented only in cases where the energy test cycle flowcharts in section 2.12.1 of this appendix require the determination of the wash/rinse temperature selection with the highest energy consumption.

3.6.1 For the wash/rinse temperature selection being considered under this section, establish the testing conditions set forth in section 2 of this appendix. Select the applicable cycle selection and wash/rinse temperature selection. For all wash/rinse temperature selections, select the cycle settings as described in section 3.2 of this appendix.

3.6.2 Measure each wash cycle's electrical energy consumption (EL) and hot water consumption (HL). Calculate the total energy consumption for each cycle selection (ETL), as follows:

ETL = EL + (HL × T × K) Where: EL is the electrical energy consumption, expressed in kilowatt-hours per cycle. HL is the hot water consumption, expressed in gallons per cycle. T = nominal temperature rise = 65 °F (36.1 °C). K = Water specific heat in kilowatt-hours per gallon per degree F = 0.00240 kWh/gal − °F (0.00114 kWh/L − °C). 4. Calculation of Derived Results From Test Measurements

4.1 Hot water and machine electrical energy consumption of clothes washers.

4.1.1 Per-cycle temperature-weighted hot water consumption for all load sizes tested. Calculate the per-cycle temperature-weighted hot water consumption for the large test load size, VhL, and the small test load size, VhS, expressed in gallons per cycle (or liters per cycle) and defined as:

(a) VhL = [HxL × TUFX] + [HhL × TUFh] + [HwL × TUFw] + [HwwL × TUFww] + [HcL × TUFc] (b) VhS = [HxS × TUFX] + [HhS × TUFh] + [HwS × TUFw] + [HwwS × TUFww] + [HcS × TUFc] Where:

HxL, HhL, HwL, HwwL, HcL, HxS, HhS, HwS, HwwS, and HcS are the hot water consumption values, in gallons per-cycle (or liters per cycle) as measured in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers.

TUFX, TUFh, TUFw, TUFww, and TUFc are temperature use factors for Extra-Hot Wash/Cold Rinse, Hot Wash/Cold Rinse, Warm Wash/Cold Rinse, Warm Wash/Warm Rinse, and Cold Wash/Cold Rinse temperature selections, respectively, as defined in Table 4.1.1 of this appendix.

4.1.2 Total per-cycle hot water energy consumption for all load sizes tested. Calculate the total per-cycle hot water energy consumption for the large test load size, HEL, and the small test load size, HES, expressed in kilowatt-hours per cycle and defined as:

(a) HEL = [VhL × T × K] = Total energy when the large test load is tested. (b) HES = [VhS × T × K] = Total energy when the small test load is tested. Where: VhL and VhS are defined in section 4.1.1 of this appendix. T = Temperature rise = 65 °F (36.1 °C). K = Water specific heat in kilowatt-hours per gallon per degree F = 0.00240 kWh/gal − °F (0.00114 kWh/L − °C).

4.1.3 Total weighted per-cycle hot water energy consumption. Calculate the total weighted per-cycle hot water energy consumption, HET, expressed in kilowatt-hours per cycle and defined as:

HET = [HEL × LUFL] + [HES × LUFS] Where: HEL and HES are defined in section 4.1.2 of this appendix. LUFL = Load usage factor for the large test load = 0.5. LUFS = Load usage factor for the small test load = 0.5.

4.1.4 Total per-cycle hot water energy consumption using gas-heated or oil-heated water, for product labeling requirements. Calculate for the energy test cycle the per-cycle hot water consumption, HETG, using gas-heated or oil-heated water, expressed in Btu per cycle (or megajoules per cycle) and defined as:

HETG = HET × 1/e × 3412 Btu/kWh or HETG = HET × 1/e × 3.6 MJ/kWh. Where: e = Nominal gas or oil water heater efficiency = 0.75. HET = As defined in section 4.1.3 of this appendix.

4.1.5 Per-cycle machine electrical energy consumption for all load sizes tested. Calculate the total per-cycle machine electrical energy consumption for the large test load size, MEL, and the small test load size, MES, expressed in kilowatt-hours per cycle and defined as:

(a) MEL = [ExL × TUFX] + [EhL × TUFh] + [EwL × TUFw] + [EwwL × TUFww] + [EcL × TUFc] (b) MES = [ExS × TUFX] + [EhS × TUFh] + [EwS × TUFw] + [EwwS × TUFww] + [EcS × TUFc] Where: ExL, EhL, EwL, EwwL, EcL, ExS, EhS, EwS, EwwS, and EcS are the electrical energy consumption values, in kilowatt-hours per cycle as measured in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers. TUFX, TUFh, TUFw, TUFww, and TUFc are defined in Table 4.1.1 of this appendix.

4.1.6 Total weighted per-cycle machine electrical energy consumption. Calculate the total weighted per-cycle machine electrical energy consumption, MET, expressed in kilowatt-hours per cycle and defined as:

MET = [MEL × LUFL] + [MES × LUFS] Where: MEL and MES are defined in section 4.1.5 of this appendix. LUFL and LUFS are defined in section 4.1.3 of this appendix.

4.2 Water consumption of clothes washers.

4.2.1 Per cycle total water consumption for each large load size tested. Calculate the per-cycle total water consumption of the large test load for the Extra-Hot Wash/Cold Rinse cycle, QxL, Hot Wash/Cold Rinse cycle, QhL, Warm Wash/Cold Rinse cycle, QwL, Warm Wash/Warm Rinse cycle, QwwL, and Cold Wash/Cold Rinse cycle, QcL, defined as:

(a) QxL = HxL + CxL (b) QhL = HhL + ChL (c) QwL = HwL + CwL (d) QwwL = HwwL + CwwL (e) QcL = HcL + CcL Where: HxL, HhL, HwL, HwwL, HcL, CxL, ChL, CwL, CwwL, and CcL are defined in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers.

4.2.2 Per cycle total water consumption for each small load size tested. Calculate the per-cycle total water consumption of the small test load for the Extra-Hot Wash/Cold Rinse cycle, QxS, Hot Wash/Cold Rinse cycle, QhS, Warm Wash/Cold Rinse cycle, QwS, Warm Wash/Warm Rinse cycle, QwwS, and Cold Wash/Cold Rinse cycle, QcS, defined as:

(a) QxS = HxS + CxS (b) QhS = HhS + ChS (c) QwS = HwS + CwS (d) QwwS = HwwS + CwwS (e) QcS = HcS + CcS Where: HxS, HhS, HwS, HwwS, HcS, CxS, ChS, CwS, CwwS, and CcS are defined in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers.

4.2.3 Per-cycle total water consumption for all load sizes tested. Calculate the total per-cycle water consumption for the large test load size, QL, and the small test load size, QS, expressed in gallons per cycle (or liters per cycle) and defined as:

(a) QL = [QxL × TUFx] + [QhL × TUFh] + [QwL × TUFw] + [QwwL × TUFww] + [QcL × TUFc] (b) QS = [QxS × TUFx] + [QhS × TUFh] + [QwS × TUFw] + [QwwS × TUFww] + [QcS × TUFc] Where: QxL, QhL, QwL, QwwL, and QcL are defined in section 4.2.1 of this appendix. QxS, QhS, QwS, QwwS, and QcS are defined in section 4.2.2 of this appendix. TUFx, TUFh, TUFw, TUFww, and TUFc are defined in Table 4.1.1 of this appendix.

4.2.4 Total weighted per-cycle water consumption. Calculate the total per-cycle water consumption, QT, expressed in gallons per cycle (or liters per cycle) and defined as:

QT = [QL × LUFL] + [QS × LUFS] Where: QL and QS are defined in section 4.2.3 of this appendix. LUFL and LUFS are defined in section 4.1.3 of this appendix.

4.3 Remaining moisture content (RMC).

4.3.1 Per cycle remaining moisture content for each large load size tested. Calculate the per-cycle remaining moisture content of the large test load for the Extra-Hot Wash/Cold Rinse cycle, RMCxL, Hot Wash/Cold Rinse cycle, RMChL, Warm Wash/Cold Rinse cycle, RMCwL, Warm Wash/Warm Rinse cycle, RMCwwL, and Cold Wash/Cold Rinse cycle, RMCcL, defined as:

(a) RMCxL = (WCxL − WIxL)/WIxL (b) RMChL = (WChL − WIhL)/WIhL (c) RMCwL = (WCwL − WIwL)/WIwL (d) RMCwwL = (WCwwL − WIwwL)/WIwwL (e) RMCcL = (WCcL − WIcL)/WIcL Where: WCxL, WChL, WCwL, WCwwL, WCcL, WIxL, WIhL, WIwL, WIwwL, and WIcL are the bone-dry weights and cycle completion weights as measured in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers.

4.3.2 Per cycle remaining moisture content for each small load size tested. Calculate the per-cycle remaining moisture content of the small test load for the Extra-Hot Wash/Cold Rinse cycle, RMCxS, Hot Wash/Cold Rinse cycle, RMChS, Warm Wash/Cold Rinse cycle, RMCwS, Warm Wash/Warm Rinse cycle, RMCwwS, and Cold Wash/Cold Rinse cycle, RMCcS, defined as:

(a) RMCxS = (WCxS—WIxS)/WIxS (b) RMChS = (WChS—WIhS)/WIhS (c) RMCwS = (WCwS—WIwS)/WIwS (d) RMCwwS = (WCwwS—WIwwS)/WIwwS (e) RMCcS = (WCcS—WIcS)/WIcS Where: WCxS, WChS, WCwS, WCwwS, WCcS, WIxS, WIhS, WIwS, WIwwS, and WIcS are the bone-dry weights and cycle completion weights as measured in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers.

4.3.3 Per-cycle remaining moisture content for all load sizes tested. Calculate the per-cycle temperature-weighted remaining moisture content for the large test load size, RMCL, and the small test load size, RMCS, defined as:

(a) RMCL = [RMCxL × TUFX] + [RMChL × TUFh] + [RMCwL × TUFw] + [RMCwwL × TUFww] + [RMCcL × TUFc] (b) RMCS = [RMCxS × TUFX] + [RMChS × TUFh] + [RMCwS × TUFw] + [RMCwwS × TUFww] + [RMCcS × TUFc] Where: RMCxL, RMChL, RMCwL, RMCwwL, and RMCcL are defined in section 4.3.1 of this appendix. RMCxS, RMChS, RMCwS, RMCwwS, and RMCcS are defined in section 4.3.2 of this appendix. TUFX, TUFh, TUFw, TUFww, and TUFc are defined in Table 4.1.1 of this appendix.

4.3.4 Weighted per-cycle remaining moisture content. Calculate the weighted per-cycle remaining moisture content, RMCT, defined as:

RMCT = [RMCL × LUFL] + [RMCS × LUFS] Where: RMCL and RMCS are defined in section 4.3.3 of this appendix. LUFL and LUFS are defined in section 4.1.3 of this appendix.

4.3.5 Apply the RMC correction curve as described in section 9 of appendix J3 to this subpart to calculate the corrected remaining moisture content, RMCcorr, expressed as a percentage as follows:

RMCcorr = (A × RMCT + B) × 100% Where: A and B are the coefficients of the RMC correction curve as defined in section 8.7 of appendix J3 to this subpart. RMCT = As defined in section 4.3.4 of this appendix.

4.4 Per-cycle energy consumption for removal of moisture from test load. Calculate the per-cycle energy required to remove the remaining moisture of the test load, DET, expressed in kilowatt-hours per cycle and defined as:

DET = [(LUFL × Large test load weight) + (LUFS × Small test load weight)] × (RMCcorr−2%) × (DEF) × (DUF) Where: LUFL and LUFS are defined in section 4.1.3 of this appendix. Large and small test load weights are defined in Table 5.1 of this appendix. RMCcorr = As defined in section 4.3.5 of this appendix. DEF = Nominal energy required for a clothes dryer to remove moisture from clothes = 0.5 kWh/lb (1.1 kWh/kg). DUF = Dryer usage factor, percentage of washer loads dried in a clothes dryer = 0.91.

4.5 Cycle time.

4.5.1 Per-cycle temperature-weighted cycle time for all load sizes tested. Calculate the per-cycle temperature-weighted cycle time for the large test load size, TL, and the small test load size, TS, expressed in minutes, and defined as:

(a) TL = [TxL × TUFX] + [ThL × TUFh] + [TwL × TUFw] + [TwwL × TUFww] + [TcL × TUFc] (b) TS = [TxS × TUFX] + [ThS × TUFh] + [TwS × TUFw] + [TwwS × TUFww] + [TcS × TUFc] Where: TxL, ThL, TwL, TwwL, TcL, TxS, ThS, TwS, TwwS, and TcS are the cycle time values, in minutes as measured in section 3.3 of this appendix for automatic clothes washers or section 3.4 of this appendix for semi-automatic clothes washers. TUFX, TUFh, TUFw, TUFww, and TUFc are temperature use factors for Extra-Hot Wash/Cold Rinse, Hot Wash/Cold Rinse, Warm Wash/Cold Rinse, Warm Wash/Warm Rinse, and Cold Wash/Cold Rinse temperature selections, respectively, as defined in Table 4.1.1 of this appendix.

4.5.2 Total weighted per-cycle cycle time. Calculate the total weighted per-cycle cycle time, TT, expressed in minutes, rounded to the nearest minute, and defined as:

TT = [TL × LUFL] + [TS × LUFS] Where: TL and TS are defined in section 4.5.1 of this appendix. LUFL and LUFS are defined in section 4.1.3 of this appendix.

4.6 Combined low-power mode energy consumption.

4.6.1 Annual hours in default inactive/off mode. Calculate the annual hours spent in default inactive/off mode, Sdefault, expressed in hours and defined as:

Sdefault = [8,760−(234 × TT/60)]/N Where: TT = As defined in section 4.5.2 of this appendix, in minutes. N = Number of inactive/off modes, defined as 1 if no optional lowest-power inactive/off mode is available; otherwise 2. 8,760 = Total number of hours in a year. 234 = Representative average number of clothes washer cycles in a year. 60 = Conversion from minutes to hours.

4.6.2 Per-cycle combined low-power mode energy consumption. Calculate the per-cycle combined low-power mode energy consumption, ETLP, expressed in kilowatt-hours per cycle and defined as:

ETLP = [(Pdefault × Sdefault) + (Plowest × Slowest)] × Kp/234 Where: Pdefault = Default inactive/off mode power, in watts, as measured in section 3.5.3 of this appendix. Plowest = Lowest-power inactive/off mode power, in watts, as measured in section 3.5.4 of this appendix for clothes washers with a switch, dial, or button that can be optionally selected by the end user to achieve a lower-power inactive/off mode than the default inactive/off mode; otherwise, Plowest = 0. Sdefault = Annual hours in default inactive/off mode, as calculated in section 4.6.1 of this appendix. Slowest = Annual hours in lowest-power inactive/off mode, defined as 0 if no optional lowest-power inactive/off mode is available; otherwise equal to Sdefault, as calculated in section 4.6.1 of this appendix. Kp = Conversion factor of watt-hours to kilowatt-hours = 0.001. 234 = Representative average number of clothes washer cycles in a year.

4.7 Water efficiency ratio. Calculate the water efficiency ratio, WER, expressed in pounds per gallon per cycle (or kilograms per liter per cycle), as:

WER = [(LUFL × Large test load weight) + (LUFS × Small test load weight)]/QT Where: LUFL and LUFS are defined in section 4.1.3 of this appendix. Large and small test load weights are defined in Table 5.1 of this appendix. QT = As defined in section 4.2.4 of this appendix.

4.8 Active-mode energy efficiency ratio. Calculate the active-mode energy efficiency ratio, AEER, expressed in pounds per kilowatt-hour per cycle (or kilograms per kilowatt-hour per cycle) and defined as:

AEER = [(LUFL × Large test load weight) + (LUFS × Small test load weight)]/(MET + HET + DET) Where: LUFL and LUFS are defined in section 4.1.3 of this appendix. Large and small test load weights are defined in Table 5.1 of this appendix. MET = As defined in section 4.1.6 of this appendix. HET = As defined in section 4.1.3 of this appendix. DET = As defined in section 4.4 of this appendix.

4.9 Energy efficiency ratio. Calculate the energy efficiency ratio, EER, expressed in pounds per kilowatt-hour per cycle (or kilograms per kilowatt-hour per cycle) and defined as:

EER = [(LUFL × Large test load weight) + (LUFS × Small test load weight)]/(MET + HET + DET + ETLP) Where: LUFL and LUFS are defined in section 4.1.3 of this appendix. Large and small test load weights are defined in Table 5.1 of this appendix. MET = As defined in section 4.1.6 of this appendix. HET = As defined in section 4.1.3 of this appendix. DET = As defined in section 4.4 of this appendix. ETLP = As defined in section 4.6.2 of this appendix. 5. Test Loads [87 FR 33381, June 1, 2022, as amended at 87 FR 78820, Dec. 23, 2022]

Note:

Manufacturers must use the results of testing under this appendix to determine compliance with the relevant standards for clothes washers from § 430.32(g)(4) and from § 431.156(b) as they appeared in January 1, 2022 edition of 10 CFR parts 200-499. Specifically, before November 28, 2022 representations must be based upon results generated either under this appendix as codified on July 1, 2022 or under this appendix as it appeared in the 10 CFR parts 200-499 edition revised as of January 1, 2022. Any representations made on or after November 28, 2022 but before the compliance date of any amended standards for clothes washers must be made based upon results generated using this appendix as codified on July 1, 2022. Manufacturers must use the results of testing under Appendix J to determine compliance with any amended standards for clothes washers provided in 10 CFR 430.32(g) and in § 431.156 that are published after January 1, 2022. Any representations related to energy or water consumption of residential or commercial clothes washers must be made in accordance with the appropriate appendix that applies (i.e., Appendix J or this appendix) when determining compliance with the relevant standard. Manufacturers may also use Appendix J to certify compliance with any amended standards prior to the applicable compliance date for those standards.

0. Incorporation by Reference

DOE incorporated by reference in § 430.3, the entire test standard for IEC 62301. However, only enumerated provisions of this standard are applicable to this appendix, as follows. In cases in which there is a conflict, the language of the test procedure in this appendix takes precedence over the referenced test standard.

0.1 IEC 62301:

(a) Section 4.2 as referenced in section 2.4 of this appendix;

(b) Section 4.3.2 as referenced in section 2.1.2 of this appendix;

(c) Section 4.4 as referenced in section 2.5.3 of this appendix;

(d) Section 5.1 as referenced in section 3.9.2 of this appendix;

(e) Section 5.2 as referenced in section 2.10 of this appendix; and

(f) Section 5.3.2 as referenced in section 3.9.3 of this appendix.

0.2 [Reserved]

1. Definitions

Active mode means a mode in which the clothes washer is connected to a mains power source, has been activated, and is performing one or more of the main functions of washing, soaking, tumbling, agitating, rinsing, and/or removing water from the clothing, or is involved in functions necessary for these main functions, such as admitting water into the washer or pumping water out of the washer. Active mode also includes delay start and cycle finished modes.

Active washing mode means a mode in which the clothes washer is performing any of the operations included in a complete cycle intended for washing a clothing load, including the main functions of washing, soaking, tumbling, agitating, rinsing, and/or removing water from the clothing.

Adaptive water fill control system means a clothes washer automatic water fill control system that is capable of automatically adjusting the water fill level based on the size or weight of the clothes load placed in the clothes container.

Automatic water fill control system means a clothes washer water fill control system that does not allow or require the user to determine or select the water fill level, and includes adaptive water fill control systems and fixed water fill control systems.

Bone-dry means a condition of a load of test cloth that has been dried in a dryer at maximum temperature for a minimum of 10 minutes, removed and weighed before cool down, and then dried again for 10 minute periods until the final weight change of the load is 1 percent or less.

Clothes container means the compartment within the clothes washer that holds the clothes during the operation of the machine.

Cold rinse means the coldest rinse temperature available on the machine, as indicated to the user on the clothes washer control panel.

Combined low-power mode means the aggregate of available modes other than active washing mode, including inactive mode, off mode, delay start mode, and cycle finished mode.

Cycle finished mode means an active mode that provides continuous status display, intermittent tumbling, or air circulation following operation in active washing mode.

Delay start mode means an active mode in which activation of active washing mode is facilitated by a timer.

Energy test cycle means the complete set of wash/rinse temperature selections required for testing, as determined according to section 2.12 of this appendix.

Fixed water fill control system means a clothes washer automatic water fill control system that automatically terminates the fill when the water reaches a pre-defined level that is not based on the size or weight of the clothes load placed in the clothes container, without allowing or requiring the user to determine or select the water fill level.

Inactive mode means a standby mode that facilitates the activation of active mode by remote switch (including remote control), internal sensor, or timer, or that provides continuous status display.

Integrated modified energy factor means the quotient of the cubic foot (or liter) capacity of the clothes container divided by the total clothes washer energy consumption per cycle, with such energy consumption expressed as the sum of:

(a) The machine electrical energy consumption;

(b) The hot water energy consumption;

(c) The energy required for removal of the remaining moisture in the wash load; and

(d) The combined low-power mode energy consumption.

Integrated water factor means the quotient of the total weighted per-cycle water consumption for all wash cycles in gallons divided by the cubic foot (or liter) capacity of the clothes washer.

Load usage factor means the percentage of the total number of wash loads that a user would wash a particular size (weight) load.

Lot means a quantity of cloth that has been manufactured with the same batches of cotton and polyester during one continuous process.

Manual water fill control system means a clothes washer water fill control system that requires the user to determine or select the water fill level.

Modified energy factor means the quotient of the cubic foot (or liter) capacity of the clothes container divided by the total clothes washer energy consumption per cycle, with such energy consumption expressed as the sum of the machine electrical energy consumption, the hot water energy consumption, and the energy required for removal of the remaining moisture in the wash load.

Non-water-heating clothes washer means a clothes washer that does not have an internal water heating device to generate hot water.

Normal cycle means the cycle recommended by the manufacturer (considering manufacturer instructions, control panel labeling, and other markings on the clothes washer) for normal, regular, or typical use for washing up to a full load of normally soiled cotton clothing. For machines where multiple cycle settings are recommended by the manufacturer for normal, regular, or typical use for washing up to a full load of normally soiled cotton clothing, then the Normal cycle is the cycle selection that results in the lowest IMEF or MEFJ2 value.

Off mode means a mode in which the clothes washer is connected to a mains power source and is not providing any active or standby mode function, and where the mode may persist for an indefinite time.

Standby mode means any mode in which the clothes washer is connected to a mains power source and offers one or more of the following user oriented or protective functions that may persist for an indefinite time:

(a) Facilitating the activation of other modes (including activation or deactivation of active mode) by remote switch (including remote control), internal sensor, or timer;

(b) Continuous functions, including information or status displays (including clocks) or sensor-based functions.

(c) A timer is a continuous clock function (which may or may not be associated with a display) that provides regular scheduled tasks (e.g., switching) and that operates on a continuous basis.

Temperature use factor means, for a particular wash/rinse temperature setting, the percentage of the total number of wash loads that an average user would wash with that setting.

User-adjustable adaptive water fill control system means a clothes washer fill control system that allows the user to adjust the amount of water that the machine provides, which is based on the size or weight of the clothes load placed in the clothes container.

Wash time means the wash portion of active washing mode, which begins when the cycle is initiated and includes the agitation or tumble time, which may be periodic or continuous during the wash portion of active washing mode.

Water factor means the quotient of the total weighted per-cycle water consumption for cold wash divided by the cubic foot (or liter) capacity of the clothes washer.

Water-heating clothes washer means a clothes washer where some or all of the hot water for clothes washing is generated by a water heating device internal to the clothes washer.

2. Testing Conditions and Instrumentation

2.1 Electrical energy supply.

2.1.1 Supply voltage and frequency. Maintain the electrical supply at the clothes washer terminal block within 2 percent of 120, 120/240, or 120/208Y volts as applicable to the particular terminal block wiring system and within 2 percent of the nameplate frequency as specified by the manufacturer. If the clothes washer has a dual voltage conversion capability, conduct test at the highest voltage specified by the manufacturer.

2.1.2 Supply voltage waveform. For the combined low-power mode testing, maintain the electrical supply voltage waveform indicated in Section 4, Paragraph 4.3.2 of IEC 62301. If the power measuring instrument used for testing is unable to measure and record the total harmonic content during the test measurement period, total harmonic content may be measured and recorded immediately before and after the test measurement period.

2.2 Supply water. Maintain the temperature of the hot water supply at the water inlets between 130 °F (54.4 °C) and 135 °F (57.2 °C), targeting the midpoint of the range. Maintain the temperature of the cold water supply at the water inlets between 55 °F (12.8 °C) and 60 °F (15.6 °C), targeting the midpoint of the range.

2.3 Water pressure. Maintain the static water pressure at the hot and cold water inlet connection of the clothes washer at 35 pounds per square inch gauge (psig) ± 2.5 psig (241.3 kPa ± 17.2 kPa) when the water is flowing.

2.4 Test room temperature. For all clothes washers, maintain the test room ambient air temperature at 75 ± 5 °F (23.9 ± 2.8 °C) for active mode testing and combined low-power mode testing. Do not use the test room ambient air temperature conditions specified in Section 4, Paragraph 4.2 of IEC 62301 for combined low-power mode testing.

2.5 Instrumentation. Perform all test measurements using the following instruments, as appropriate:

2.5.1 Weighing scales.

2.5.1.1 Weighing scale for test cloth. The scale used for weighing test cloth must have a resolution of no larger than 0.2 oz (5.7 g) and a maximum error no greater than 0.3 percent of the measured value.

2.5.1.2 Weighing scale for clothes container capacity measurement. The scale used for performing the clothes container capacity measurement must have a resolution no larger than 0.50 lbs (0.23 kg) and a maximum error no greater than 0.5 percent of the measured value.

2.5.2 Watt-hour meter. The watt-hour meter used to measure electrical energy consumption must have a resolution no larger than 1 Wh (3.6 kJ) and a maximum error no greater than 2 percent of the measured value for any demand greater than 50 Wh (180.0 kJ).

2.5.3 Watt meter. The watt meter used to measure combined low-power mode power consumption must comply with the requirements specified in Section 4, Paragraph 4.4 of IEC 62301 (incorporated by reference, see § 430.3). If the power measuring instrument used for testing is unable to measure and record the crest factor, power factor, or maximum current ratio during the test measurement period, the crest factor, power factor, and maximum current ratio may be measured and recorded immediately before and after the test measurement period.

2.5.4 Water and air temperature measuring devices. The temperature devices used to measure water and air temperature must have an error no greater than ±1 °F (±0.6 °C) over the range being measured.

2.5.4.1 Non-reversible temperature indicator labels, adhered to the inside of the clothes container, may be used to confirm that an extra-hot wash temperature greater than 135 °F has been achieved during the wash cycle, under the following conditions. The label must remain waterproof, intact, and adhered to the wash drum throughout an entire wash cycle; provide consistent maximum temperature readings; and provide repeatable temperature indications sufficient to demonstrate that a wash temperature of greater than 135 °F has been achieved. The label must have been verified to consistently indicate temperature measurements with an accuracy of ±1 °F if the label provides a temperature indicator at 135 °F. If the label does not provide a temperature indicator at 135 °F, the label must have been verified to consistently indicate temperature measurements with an accuracy of ±1 °F if the next-highest temperature indicator is greater than 135 °F and less than 140 °F, or ±3 °F if the next-highest temperature indicator is 140 °F or greater. If the label does not provide a temperature indicator at 135 °F, failure to activate the next-highest temperature indicator does not necessarily indicate the lack of an extra-hot wash temperature. However, such a result would not be conclusive due to the lack of verification of the water temperature requirement, in which case an alternative method must be used to confirm that an extra-hot wash temperature greater than 135 °F has been achieved during the wash cycle. If using a temperature indicator label to test a front-loading clothes washer, adhere the label along the interior surface of the clothes container drum, midway between the front and the back of the drum, adjacent to one of the baffles. If using a temperature indicator label to test a top-loading clothes washer, adhere the label along the interior surface of the clothes container drum, on the vertical portion of the sidewall, as close to the bottom of the container as possible.

2.5.4.2 Submersible temperature loggers placed inside the wash drum may be used to confirm that an extra-hot wash temperature greater than 135 °F has been achieved during the wash cycle, under the following conditions. The submersible temperature logger must have a time resolution of at least 1 data point every 5 seconds and a temperature measurement accuracy of ±1 °F. Due to the potential for a waterproof capsule to provide a thermal insulating effect, failure to measure a temperature of 135 °F does not necessarily indicate the lack of an extra-hot wash temperature. However, such a result would not be conclusive due to the lack of verification of the water temperature requirement, in which case an alternative method must be used to confirm that an extra-hot wash temperature greater than 135 °F has been achieved during the wash cycle.

2.5.5 Water meter. A water meter must be installed in both the hot and cold water lines to measure water flow and/or water consumption. The water meters must have a resolution no larger than 0.1 gallons (0.4 liters) and a maximum error no greater than 2 percent for the water flow rates being measured. If the volume of hot water for any individual cycle within the energy test cycle is less than 0.1 gallons (0.4 liters), the hot water meter must have a resolution no larger than 0.01 gallons (0.04 liters).

2.5.6 Water pressure gauge. A water pressure gauge must be installed in both the hot and cold water lines to measure water pressure. The water pressure gauges must have a resolution of 1 pound per square inch gauge (psig) (6.9 kPa) and a maximum error no greater than 5 percent of any measured value.

2.6 Bone dryer temperature. The dryer used for bone drying must heat the test cloth load above 210 °F (99 °C).

2.7 Test cloths. The test cloth material and dimensions must conform to the specifications in appendix J3 to this subpart. The energy test cloth and the energy stuffer cloths must be clean and must not be used for more than 60 test runs (after preconditioning as specified in section 5 of appendix J3 to this subpart). All energy test cloth must be permanently marked identifying the lot number of the material. Mixed lots of material must not be used for testing a clothes washer. The moisture absorption and retention must be evaluated for each new lot of test cloth using the standard extractor Remaining Moisture Content (RMC) procedure specified in appendix J3 to this subpart.

2.8 Test load sizes. Use Table 5.1 of this appendix to determine the maximum, minimum, and, when required, average test load sizes based on the clothes container capacity as measured in section 3.1 of this appendix. Test loads must consist of energy test cloths and no more than five energy stuffer cloths per load to achieve the proper weight.

Use the test load sizes and corresponding water fill settings defined in Table 2.8 of this appendix when measuring water and energy consumption. Use only the maximum test load size when measuring RMC.

2.9 Use of test loads.

2.9.1 Test loads for energy and water consumption measurements must be bone dry prior to the first cycle of the test, and dried to a maximum of 104 percent of bone dry weight for subsequent testing.

2.9.2 Prepare the energy test cloths for loading by grasping them in the center, lifting, and shaking them to hang loosely, as illustrated in Figure 2.9.2 of this appendix.

For all clothes washers, follow any manufacturer loading instructions provided to the user regarding the placement of clothing within the clothes container. In the absence of any manufacturer instructions regarding the placement of clothing within the clothes container, the following loading instructions apply.

2.9.2.1 To load the energy test cloths in a top-loading clothes washer, arrange the cloths circumferentially around the axis of rotation of the clothes container, using alternating lengthwise orientations for adjacent pieces of cloth. Complete each cloth layer across its horizontal plane within the clothes container before adding a new layer. Figure 2.9.2.1 of this appendix illustrates the correct loading technique for a vertical-axis clothes washer.

2.9.2.2 To load the energy test cloths in a front-loading clothes washer, grasp each test cloth in the center as indicted in section 2.9.2 of this appendix, and then place each cloth into the clothes container prior to activating the clothes washer.

2.10 Clothes washer installation. Install the clothes washer in accordance with manufacturer's instructions. For combined low-power mode testing, install the clothes washer in accordance with Section 5, Paragraph 5.2 of IEC 62301 (incorporated by reference; see § 430.3), disregarding the provisions regarding batteries and the determination, classification, and testing of relevant modes.

2.11 Clothes washer pre-conditioning.

2.11.1 Non-water-heating clothes washer. If the clothes washer has not been filled with water in the preceding 96 hours, pre-condition it by running it through a cold rinse cycle and then draining it to ensure that the hose, pump, and sump are filled with water.

2.11.2 Water-heating clothes washer. If the clothes washer has not been filled with water in the preceding 96 hours, or if it has not been in the test room at the specified ambient conditions for 8 hours, pre-condition it by running it through a cold rinse cycle and then draining it to ensure that the hose, pump, and sump are filled with water.

2.12 Determining the energy test cycle. To determine the energy test cycle, evaluate the wash/rinse temperature selection flowcharts in the order in which they are presented in this section. Except for Cold Wash/Cold Rinse, use the maximum load size to evaluate each flowchart. The determination of the energy test cycle must take into consideration all cycle settings available to the end user, including any cycle selections or cycle modifications provided by the manufacturer via software or firmware updates to the product, for the basic model under test. The energy test cycle does not include any cycle that is recommended by the manufacturer exclusively for cleaning, deodorizing, or sanitizing the clothes washer.

3. Test Measurements

3.1 Clothes container capacity. Measure the entire volume that a clothes load could occupy within the clothes container during active mode washer operation according to the following procedures:

3.1.1 Place the clothes washer in such a position that the uppermost edge of the clothes container opening is leveled horizontally, so that the container will hold the maximum amount of water. For front-loading clothes washers, the door seal and shipping bolts or other forms of bracing hardware to support the wash drum during shipping must remain in place during the capacity measurement.

If the design of a front-loading clothes washer does not include shipping bolts or other forms of bracing hardware to support the wash drum during shipping, a laboratory may support the wash drum by other means, including temporary bracing or support beams. Any temporary bracing or support beams must keep the wash drum in a fixed position, relative to the geometry of the door and door seal components, that is representative of the position of the wash drum during normal operation. The method used must avoid damage to the unit that would affect the results of the energy and water testing.

For a front-loading clothes washer that does not include shipping bolts or other forms of bracing hardware to support the wash drum during shipping, the laboratory must fully document the alternative method used to support the wash drum during capacity measurement, include such documentation in the final test report, and pursuant to § 429.71 of this chapter, the manufacturer must retain such documentation as part its test records.

3.1.2 Line the inside of the clothes container with a 2 mil thickness (0.051 mm) plastic bag. All clothes washer components that occupy space within the clothes container and that are recommended for use during a wash cycle must be in place and must be lined with a 2 mil thickness (0.051 mm) plastic bag to prevent water from entering any void space.

3.1.3 Record the total weight of the machine before adding water.

3.1.4 Fill the clothes container manually with either 60 °F ± 5 °F (15.6 °C ± 2.8 °C) or 100 °F ± 10 °F (37.8 °C ± 5.5 °C) water, with the door open. For a top-loading vertical-axis clothes washer, fill the clothes container to the uppermost edge of the rotating portion, including any balance ring. Figure 3.1.4.1 of this appendix illustrates the maximum fill level for top-loading clothes washers.

For a front-loading horizontal-axis clothes washer, fill the clothes container to the highest point of contact between the door and the door gasket. If any portion of the door or gasket would occupy the measured volume space when the door is closed, exclude from the measurement the volume that the door or gasket portion would occupy. For a front-loading horizontal-axis clothes washer with a concave door shape, include any additional volume above the plane defined by the highest point of contact between the door and the door gasket, if that area can be occupied by clothing during washer operation. For a top-loading horizontal-axis clothes washer, include any additional volume above the plane of the door hinge that clothing could occupy during washer operation. Figure 3.1.4.2 of this appendix illustrates the maximum fill volumes for all horizontal-axis clothes washer types.

For all clothes washers, exclude any volume that cannot be occupied by the clothing load during operation.

3.1.5 Measure and record the weight of water, W, in pounds.

3.1.6 Calculate the clothes container capacity as follows:

C = W/d where: C = Capacity in cubic feet (liters). W = Mass of water in pounds (kilograms). d = Density of water (62.0 lbs/ft 3 for 100 °F (993 kg/m 3 for 37.8 °C) or 62.3 lbs/ft 3 for 60 °F (998 kg/m 3 for 15.6 °C)).

3.1.7 Calculate the clothes container capacity, C, to the nearest 0.01 cubic foot for the purpose of determining test load sizes per Table 5.1 of this appendix and for all subsequent calculations that include the clothes container capacity.

3.2 Procedure for measuring water and energy consumption values on all automatic and semi-automatic washers.

3.2.1 Perform all energy consumption tests under the energy test cycle.

3.2.2 Perform the test sections listed in Table 3.2.2 in accordance with the wash/rinse temperature selections available in the energy test cycle.

3.2.3 Hot and cold water faucets.

3.2.3.1 For automatic clothes washers, open both the hot and cold water faucets.

3.2.3.2 For semi-automatic washers:

(1) For hot inlet water temperature, open the hot water faucet completely and close the cold water faucet;

(2) For warm inlet water temperature, open both hot and cold water faucets completely;

(3) For cold inlet water temperature, close the hot water faucet and open the cold water faucet completely.

3.2.4 Wash/rinse temperature selection. Set the wash/rinse temperature selection control to obtain the desired wash/rinse temperature selection within the energy test cycle.

3.2.5 Wash time setting.

3.2.5.1 If the cycle under test offers a range of wash time settings, the wash time setting shall be the higher of either the minimum or 70 percent of the maximum wash time available for the wash cycle under test, regardless of the labeling of suggested dial locations. If 70 percent of the maximum wash time is not available on a dial with a discrete number of wash time settings, choose the next-highest setting greater than 70 percent.

3.2.5.2 If the clothes washer is equipped with an electromechanical dial or timer controlling wash time that rotates in both directions, reset the dial to the minimum wash time and then turn it in the direction of increasing wash time to reach the appropriate setting. If the appropriate setting is passed, return the dial to the minimum wash time and then turn in the direction of increasing wash time until the appropriate setting is reached.

3.2.6 Water fill levels.

3.2.6.1 Clothes washers with manual water fill control system. Set the water fill selector to the maximum water level available for the wash cycle under test for the maximum test load size and the minimum water level available for the wash cycle under test for the minimum test load size.

3.2.6.2 Clothes washers with automatic water fill control system.

3.2.6.2.1 Not user adjustable. The maximum, minimum, and average water levels as described in the following sections refer to the amount of water fill that is automatically selected by the control system when the respective test loads are used.

3.2.6.2.2 User-adjustable adaptive. Conduct four tests on clothes washers with user-adjustable adaptive water fill controls. Conduct the first test using the maximum test load and with the adaptive water fill control system set in the setting that uses the most water. Conduct the second test using the minimum test load and with the adaptive water fill control system set in the setting that uses the least water. Conduct the third test using the average test load and with the adaptive water fill control system set in the setting that uses the most water. Conduct the fourth test using the average test load and with the adaptive water fill control system set in the setting that uses the least water. Average the results of the third and fourth tests to obtain the energy and water consumption values for the average test load size.

3.2.6.3 Clothes washers with automatic water fill control system and alternate manual water fill control system. If a clothes washer with an automatic water fill control system allows user selection of manual controls as an alternative, test both manual and automatic modes and, for each mode, calculate the energy consumption (HET, MET, and DE) and water consumption (QT) values as set forth in section 4 of this appendix. Then, calculate the average of the two values (one from each mode, automatic and manual) for each variable (HET, MET, DE, and QT) and use the average value for each variable in the final calculations in section 4 of this appendix.

3.2.7 Manufacturer default settings. For clothes washers with electronic control systems, use the manufacturer default settings for any cycle selections, except for (1) the temperature selection, (2) the wash water fill levels, (3) if necessary, the spin speeds on wash cycles used to determine remaining moisture content, or (4) network settings. If the clothes washer has network capabilities, the network settings must be disabled throughout testing if such settings can be disabled by the end-user and the product's user manual provides instructions on how to do so. For all other cycle selections, the manufacturer default settings must be used for wash conditions such as agitation/tumble operation, soil level, spin speed on wash cycles used to determine energy and water consumption, wash times, rinse times, optional rinse settings, water heating time for water heating clothes washers, and all other wash parameters or optional features applicable to that wash cycle. Any optional wash cycle feature or setting (other than wash/rinse temperature, water fill level selection, spin speed on wash cycles used to determine remaining moisture content, or network settings on clothes washers with network capabilities) that is activated by default on the wash cycle under test must be included for testing unless the manufacturer instructions recommend not selecting this option, or recommend selecting a different option, for washing normally soiled cotton clothing. For clothes washers with control panels containing mechanical switches or dials, any optional settings, except for (1) the temperature selection, (2) the wash water fill levels, or (3) if necessary, the spin speeds on wash cycles used to determine remaining moisture content, must be in the position recommended by the manufacturer for washing normally soiled cotton clothing. If the manufacturer instructions do not recommend a particular switch or dial position to be used for washing normally soiled cotton clothing, the setting switch or dial must remain in its as-shipped position.

3.2.8 For each wash cycle tested, include the entire active washing mode and exclude any delay start or cycle finished modes.

3.2.9 Anomalous Test Cycles. If during a wash cycle the clothes washer: (a) Signals to the user by means of a visual or audio alert that an out-of-balance condition has been detected; or (b) terminates prematurely and thus does not include the agitation/tumble operation, spin speed(s), wash times, and rinse times applicable to the wash cycle under test, discard the test data and repeat the wash cycle. Document in the test report the rejection of data from any wash cycle during testing and the reason for the rejection.

3.3 Extra-Hot Wash/Cold Rinse. Measure the water and electrical energy consumption for each water fill level and test load size as specified in sections 3.3.1 through 3.3.3 of this appendix for the Extra-Hot Wash/Cold Rinse as defined within the energy test cycle.

3.3.1 Maximum test load and water fill. Measure the values for hot water consumption (HmX), cold water consumption (CmX), and electrical energy consumption (EmX) for an Extra-Hot Wash/Cold Rinse cycle, with the controls set for the maximum water fill level. Use the maximum test load size as specified in Table 5.1 of this appendix.

3.3.2 Minimum test load and water fill. Measure the values for hot water consumption (Hmn), cold water consumption (Cmn), and electrical energy consumption (Emn) for an Extra-Hot Wash/Cold Rinse cycle, with the controls set for the minimum water fill level. Use the minimum test load size as specified in Table 5.1 of this appendix.

3.3.3 Average test load and water fill. For a clothes washer with an automatic water fill control system, measure the values for hot water consumption (Hma), cold water consumption (Cma), and electrical energy consumption (Ema) for an Extra-Hot Wash/Cold Rinse cycle. Use the average test load size as specified in Table 5.1 of this appendix.

3.4 Hot Wash/Cold Rinse. Measure the water and electrical energy consumption for each water fill level and test load size as specified in sections 3.4.1 through 3.4.3 of this appendix for the Hot Wash/Cold Rinse temperature selection, as defined within the energy test cycle.

3.4.1 Maximum test load and water fill. Measure the values for hot water consumption (HhX), cold water consumption (ChX), and electrical energy consumption (EhX) for a Hot Wash/Cold Rinse cycle, with the controls set for the maximum water fill level. Use the maximum test load size as specified in Table 5.1 of this appendix.

3.4.2 Minimum test load and water fill. Measure the values for hot water consumption (Hhn), cold water consumption (Chn), and electrical energy consumption (Ehn) for a Hot Wash/Cold Rinse cycle, with the controls set for the minimum water fill level. Use the minimum test load size as specified in Table 5.1 of this appendix.

3.4.3 Average test load and water fill. For a clothes washer with an automatic water fill control system, measure the values for hot water consumption (Hha), cold water consumption (Cha), and electrical energy consumption (Eha) for a Hot Wash/Cold Rinse cycle. Use the average test load size as specified in Table 5.1 of this appendix.

3.5 Warm Wash/Cold Rinse. Measure the water and electrical energy consumption for each water fill level and test load size as specified in sections 3.5.1 through 3.5.3 of this appendix for the applicable Warm Wash/Cold Rinse temperature selection(s), as defined within the energy test cycle.

For a clothes washer with fewer than four discrete Warm Wash/Cold Rinse temperature selections, test all Warm Wash/Cold Rinse selections. For a clothes washer that offers four or more Warm Wash/Cold Rinse selections, test at all discrete selections, or test at the 25 percent, 50 percent, and 75 percent positions of the temperature selection device between the hottest hot (≤135 °F (57.2 °C)) wash and the coldest cold wash. If a selection is not available at the 25, 50 or 75 percent position, in place of each such unavailable selection, use the next warmer setting. For each reportable value to be used for the Warm Wash/Cold Rinse temperature selection, calculate the average of all Warm Wash/Cold Rinse temperature selections tested pursuant to this section.

3.5.1 Maximum test load and water fill. Measure the values for hot water consumption (HwX), cold water consumption (CwX), and electrical energy consumption (EwX) for the Warm Wash/Cold Rinse cycle, with the controls set for the maximum water fill level. Use the maximum test load size as specified in Table 5.1 of this appendix.

3.5.2 Minimum test load and water fill. Measure the values for hot water consumption (Hwn), cold water consumption (Cwn), and electrical energy consumption (Ewn) for the Warm Wash/Cold Rinse cycle, with the controls set for the minimum water fill level. Use the minimum test load size as specified in Table 5.1 of this appendix.

3.5.3 Average test load and water fill. For a clothes washer with an automatic water fill control system, measure the values for hot water consumption (Hwa), cold water consumption (Cwa), and electrical energy consumption (Ewa) for a Warm Wash/Cold Rinse cycle. Use the average test load size as specified in Table 5.1 of this appendix.

3.6 Warm Wash/Warm Rinse. Measure the water and electrical energy consumption for each water fill level and/or test load size as specified in sections 3.6.1 through 3.6.3 of this appendix for the applicable Warm Wash/Warm Rinse temperature selection(s), as defined within the energy test cycle. For a clothes washer with fewer than four discrete Warm Wash/Warm Rinse temperature selections, test all Warm Wash/Warm Rinse selections. For a clothes washer that offers four or more Warm Wash/Warm Rinse selections, test at all discrete selections, or test at 25 percent, 50 percent, and 75 percent positions of the temperature selection device between the hottest hot (≤ 135 °F (57.2 °C)) wash and the coldest cold wash. If a selection is not available at the 25, 50 or 75 percent position, in place of each such unavailable selection use the next warmer setting. For each reportable value to be used for the Warm Wash/Warm Rinse temperature selection, calculate the average of all Warm Wash/Warm Rinse temperature selections tested pursuant to this section.

3.6.1 Maximum test load and water fill. Measure the values for hot water consumption (HwwX), cold water consumption (CwwX), and electrical energy consumption (EwwX) for the Warm Wash/Warm Rinse cycle, with the controls set for the maximum water fill level. Use the maximum test load size as specified in Table 5.1 of this appendix.

3.6.2 Minimum test load and water fill. Measure the values for hot water consumption (Hwwn), cold water consumption (Cwwn), and electrical energy consumption (Ewwn) for the Warm Wash/Warm Rinse cycle, with the controls set for the minimum water fill level. Use the minimum test load size as specified in Table 5.1 of this appendix.

3.6.3 Average test load and water fill. For a clothes washer with an automatic water fill control system, measure the values for hot water consumption (Hwwa), cold water consumption (Cwwa), and electrical energy consumption (Ewwa) for the Warm Wash/Warm Rinse cycle. Use the average test load size as specified in Table 5.1 of this appendix.

3.7 Cold Wash/Cold Rinse. Measure the water and electrical energy consumption for each water fill level and test load size as specified in sections 3.7.1 through 3.7.3 of this appendix for the applicable Cold Wash/Cold Rinse temperature selection, as defined within the energy test cycle.

3.7.1 Maximum test load and water fill. Measure the values for hot water consumption (HcX), cold water consumption (CcX), and electrical energy consumption (EcX) for a Cold Wash/Cold Rinse cycle, with the controls set for the maximum water fill level. Use the maximum test load size as specified in Table 5.1 of this appendix.

3.7.2 Minimum test load and water fill. Measure the values for hot water consumption (Hcn), cold water consumption (Ccn), and electrical energy consumption (Ecn) for a Cold Wash/Cold Rinse cycle, with the controls set for the minimum water fill level. Use the minimum test load size as specified in Table 5.1 of this appendix.

3.7.3 Average test load and water fill. For a clothes washer with an automatic water fill control system, measure the values for hot water consumption (Hca), cold water consumption (Cca), and electrical energy consumption (Eca) for a Cold Wash/Cold Rinse cycle. Use the average test load size as specified in Table 5.1 of this appendix.

3.8 Remaining moisture content (RMC).

3.8.1 The wash temperature must be the same as the rinse temperature for all testing. Use the maximum test load as defined in Table 5.1 of this appendix for testing.

3.8.2 Clothes washers with cold rinse only.

3.8.2.1 Record the actual “bone dry” weight of the test load (WIX), then place the test load in the clothes washer.

3.8.2.2 Set the water level controls to maximum fill.

3.8.2.3 Run the Cold Wash/Cold Rinse cycle.

3.8.2.4 Record the weight of the test load immediately after completion of the wash cycle (WCX).

3.8.2.5 Calculate the remaining moisture content of the maximum test load, RMCX, defined as:

RMCX = (WCX − WIX)/WIX

3.8.2.6 Apply the RMC correction curve described in section 9 of appendix J3 to this subpart to calculate the corrected remaining moisture content, RMCcorr, expressed as a percentage as follows:

RMCcorr = (A × RMCX + B) × 100% where: A and B are the coefficients of the RMC correction curve as defined in section 8.7 of appendix J3 to this subpart. RMCX = As defined in section 3.8.2.5 of this appendix.

3.8.2.7 Use RMCcorr as the final corrected RMC in section 4.3 of this appendix.

3.8.3 Clothes washers with both cold and warm rinse options.

3.8.3.1 Complete sections 3.8.2.1 through 3.8.2.4 of this appendix for a Cold Wash/Cold Rinse cycle. Calculate the remaining moisture content of the maximum test load for Cold Wash/Cold Rinse, RMCCOLD, defined as:

RMCCOLD = (WCX − WIX)/WIX

3.8.3.2 Apply the RMC correction curve described in section 9 of appendix J3 to this subpart to calculate the corrected remaining moisture content for Cold Wash/Cold Rinse, RMCCOLD,corr, expressed as a percentage, as follows:

RMCCOLD,corr = (A × RMCCOLD + B) × 100% where: A and B are the coefficients of the RMC correction curve as defined in section 8.7 of appendix J3 to this subpart. RMCCOLD = As defined in section 3.8.3.1 of this appendix.

3.8.3.3 Complete sections 3.8.2.1 through 3.8.2.4 of this appendix using a Warm Wash/Warm Rinse cycle instead. Calculate the remaining moisture content of the maximum test load for Warm Wash/Warm Rinse, RMCWARM, defined as:

RMCWARM = (WCX−WIX)/WIX

3.8.3.4 Apply the RMC correction curve described in section 9 of appendix J3 to this subpart to calculate the corrected remaining moisture content for Warm Wash/Warm Rinse, RMCWARM,corr, expressed as a percentage, as follows:

RMCWARM,corr = (A × RMCWARM + B) × 100% where: A and B are the coefficients of the RMC correction curve as defined in section 8.7 of appendix J3 to this subpart. RMCWARM = As defined in section 3.8.3.3 of this appendix.

3.8.3.5 Calculate the corrected remaining moisture content of the maximum test load, RMCcorr, expressed as a percentage as follows:

RMCcorr = RMCCOLD,corr × (1 − TUFww) + RMCWARM,corr × (TUFww) where: RMCCOLD,corr = As defined in section 3.8.3.2 of this Appendix. RMCWARM,corr = As defined in section 3.8.3.4 of this Appendix. TUFww is the temperature use factor for Warm Wash/Warm Rinse as defined in Table 4.1.1 of this appendix.

3.8.3.6 Use RMCcorr as calculated in section 3.8.3.5 as the final corrected RMC used in section 4.3 of this appendix.

3.8.4 Clothes washers that have options such as multiple selections of spin speeds or spin times that result in different RMC values, and that are available within the energy test cycle.

3.8.4.1 Complete sections 3.8.2 or 3.8.3 of this appendix, as applicable, using the maximum and minimum extremes of the available spin options, excluding any “no spin” (zero spin speed) settings. Combine the calculated values RMCcorr,max extraction and RMCcorr,min extraction at the maximum and minimum settings, respectively, as follows:

RMCcorr = 0.75 × RMCcorr,max extraction + 0.25 × RMCcorr,min extraction where: RMCcorr, max extraction is the corrected remaining moisture content using the maximum spin setting, calculated according to section 3.8.2 or 3.8.3 of this appendix, as applicable. RMCcorr, min extraction is the corrected remaining moisture content using the minimum spin setting, calculated according to section 3.8.2 or 3.8.3 of this appendix, as applicable.

3.8.4.2 Use RMCcorr as calculated in section 3.8.4.1 as the final corrected RMC used in section 4.3 of this appendix.

3.8.5 The procedure for calculating the corrected RMC as described in section 3.8.2, 3.8.3, or 3.8.4 of this appendix may be replicated twice in its entirety, for a total of three independent corrected RMC measurements. If three replications of the RMC measurement are performed, use the average of the three corrected RMC measurements as the final corrected RMC in section 4.3 of this appendix.

3.9 Combined low-power mode power. Connect the clothes washer to a watt meter as specified in section 2.5.3 of this appendix. Establish the testing conditions set forth in sections 2.1, 2.4, and 2.10 of this appendix.

3.9.1 Perform combined low-power mode testing after completion of an active mode wash cycle included as part of the energy test cycle; after removing the test load; without changing the control panel settings used for the active mode wash cycle; with the door closed; and without disconnecting the electrical energy supply to the clothes washer between completion of the active mode wash cycle and the start of combined low-power mode testing.

3.9.2 For a clothes washer that takes some time to automatically enter a stable inactive mode or off mode state from a higher power state as discussed in Section 5, Paragraph 5.1, note 1 of IEC 62301 (incorporated by reference; see § 430.3), allow sufficient time for the clothes washer to automatically reach the default inactive/off mode state before proceeding with the test measurement.

3.9.3 Once the stable inactive/off mode state has been reached, measure and record the default inactive/off mode power, Pdefault, in watts, following the test procedure for the sampling method specified in Section 5, Paragraph 5.3.2 of IEC 62301.

3.9.4 For a clothes washer with a switch, dial, or button that can be optionally selected by the end user to achieve a lower-power inactive/off mode state than the default inactive/off mode state measured in section 3.9.3 of this appendix, after performing the measurement in section 3.9.3, activate the switch, dial, or button to the position resulting in the lowest power consumption and repeat the measurement procedure described in section 3.9.3. Measure and record the lowest-power inactive/off mode power, Plowest, in Watts.

3.10 Energy consumption for the purpose of determining the cycle selection(s) to be included in the energy test cycle. This section is implemented only in cases where the energy test cycle flowcharts in section 2.12 require the determination of the wash/rinse temperature selection with the highest energy consumption.

3.10.1 For the wash/rinse temperature selection being considered under this section, establish the testing conditions set forth in section 2 of this appendix. Select the applicable cycle selection and wash/rinse temperature selection. For all wash/rinse temperature selections, the manufacturer default settings shall be used as described in section 3.2.7 of this appendix.

3.10.2 Use the clothes washer's maximum test load size, determined from Table 5.1 of this appendix, for testing under this section.

3.10.3 For clothes washers with a manual fill control system, user-adjustable automatic water fill control system, or automatic water fill control system with alternate manual water fill control system, use the water fill selector setting resulting in the maximum water level available for each cycle selection for testing under this section.

3.10.4 Each wash cycle tested under this section shall include the entire active washing mode and exclude any delay start or cycle finished modes.

3.10.5 Measure each wash cycle's electrical energy consumption (EX) and hot water consumption (HX). Calculate the total energy consumption for each cycle selection (ETX), as follows:

ETX = EX + (HX × T × K) where: EX is the electrical energy consumption, expressed in kilowatt-hours per cycle. HX is the hot water consumption, expressed in gallons per cycle. T = nominal temperature rise = 75 °F (41.7 °C). K = Water specific heat in kilowatt-hours per gallon per degree F = 0.00240 kWh/gal - °F (0.00114 kWh/L- °C). 4. Calculation of Derived Results From Test Measurements

4.1 Hot water and machine electrical energy consumption of clothes washers.

4.1.1 Per-cycle temperature-weighted hot water consumption for all maximum, average, and minimum water fill levels tested. Calculate the per-cycle temperature-weighted hot water consumption for the maximum water fill level, VhX, the average water fill level, Vha, and the minimum water fill level, Vhn, expressed in gallons per cycle (or liters per cycle) and defined as:

(a) VhX = [HmX × TUFm] + [HhX × TUFh] + [HwX × TUFw] + [HwwX × TUFww] + [HcX × TUFc] (b) Vha = [Hma × TUFm] + [Hha × TUFh] + [Hwa × TUFw] + [Hwwa × TUFww] + [Hca × TUFc] (c) Vhn = [Hmn × TUFm] + [Hhn × TUFh] + [Hwn × TUFw] + [Hwwn × TUFww] + [Hcn × TUFc] where:

HmX, Hma, and Hmn, are reported hot water consumption values, in gallons per-cycle (or liters per cycle), at maximum, average, and minimum water fill levels, respectively, for the Extra-Hot Wash/Cold Rinse cycle, as measured in sections 3.3.1 through 3.3.3 of this appendix.

HhX, Hha, and Hhn, are reported hot water consumption values, in gallons per-cycle (or liters per cycle), at maximum, average, and minimum water fill levels, respectively, for the Hot Wash/Cold Rinse cycle, as measured in sections 3.4.1 through 3.4.3 of this appendix.

HwX, Hwa, and Hwn, are reported hot water consumption values, in gallons per-cycle (or liters per cycle), at maximum, average, and minimum water fill levels, respectively, for the Warm Wash/Cold Rinse cycle, as measured in sections 3.5.1 through 3.5.3 of this appendix.

HwwX, Hwwa, and Hwwn, are reported hot water consumption values, in gallons per-cycle (or liters per cycle), at maximum, average, and minimum water fill levels, respectively, for the Warm Wash/Warm Rinse cycle, as measured in sections 3.6.1 through 3.6.3 of this appendix.

HcX, Hca, and Hcn, are reported hot water consumption values, in gallons per-cycle (or liters per cycle), at maximum, average, and minimum water fill levels, respectively, for the Cold Wash/Cold Rinse cycle, as measured in sections 3.7.1 through 3.7.3 of this appendix.

TUFm, TUFh, TUFw, TUFww, and TUFc are temperature use factors for Extra-Hot Wash/Cold Rinse, Hot Wash/Cold Rinse, Warm Wash/Cold Rinse, Warm Wash/Warm Rinse, and Cold Wash/Cold Rinse temperature selections, respectively, as defined in Table 4.1.1 of this appendix.

4.1.2 Total per-cycle hot water energy consumption for all maximum, average, and minimum water fill levels tested. Calculate the total per-cycle hot water energy consumption for the maximum water fill level, HEmax, the average water fill level, HEavg, and the minimum water fill level, HEmin, expressed in kilowatt-hours per cycle and defined as:

(a) HEmax = [VhX × T × K] = Total energy when a maximum load is tested. (b) HEavg = [Vha × T × K] = Total energy when an average load is tested. (c) HEmin = [Vhn × T × K] = Total energy when a minimum load is tested. where: VhX, Vha, and Vhn are defined in section 4.1.1 of this appendix. T = Temperature rise = 75 °F (41.7 °C). K = Water specific heat in kilowatt-hours per gallon per degree F = 0.00240 kWh/gal- °F (0.00114 kWh/L- °C).

4.1.3 Total weighted per-cycle hot water energy consumption. Calculate the total weighted per-cycle hot water energy consumption, HET, expressed in kilowatt-hours per cycle and defined as:

HET = [HEmax × Fmax] + [HEavg × Favg] + HEmin × Fmin] where:

HEmax, HEavg, and HEmin are defined in section 4.1.2 of this appendix.

Fmax, Favg, and Fmin are the load usage factors for the maximum, average, and minimum test loads based on the size and type of the control system on the washer being tested, as defined in Table 4.1.3 of this appendix.

4.1.4 Total per-cycle hot water energy consumption using gas-heated or oil-heated water, for product labeling requirements. Calculate for the energy test cycle the per-cycle hot water consumption, HETG, using gas-heated or oil-heated water, expressed in Btu per cycle (or megajoules per cycle) and defined as:

HETG = HET × 1/e × 3412 Btu/kWh or HETG = HET × 1/e × 3.6 MJ/kWh where: e = Nominal gas or oil water heater efficiency = 0.75. HET = As defined in section 4.1.3 of this Appendix.

4.1.5 Per-cycle machine electrical energy consumption for all maximum, average, and minimum test load sizes. Calculate the total per-cycle machine electrical energy consumption for the maximum water fill level, MEmax, the average water fill level, MEavg, and the minimum water fill level, MEmin, expressed in kilowatt-hours per cycle and defined as:

(a) MEmax = [EmX × TUFm] + [EhX × TUFh] + [EwX × TUFw] + [EwwX × TUFww] + [EcX × TUFc] (b) MEavg = [Ema × TUFm] + [Eha × TUFh] + [Ewa × TUFw] + [Ewwa × TUFww] + [Eca × TUFc] (c) MEmin = [Emn × TUFm] + [Ehn × TUFh] + [Ewn × TUFw] + [Ewwn × TUFww] + [Ecn × TUFc] where:

EmX, Ema, and Emn, are reported electrical energy consumption values, in kilowatt-hours per cycle, at maximum, average, and minimum test loads, respectively, for the Extra-Hot Wash/Cold Rinse cycle, as measured in sections 3.3.1 through 3.3.3 of this appendix.

EhX, Eha, and Ehn, are reported electrical energy consumption values, in kilowatt-hours per cycle, at maximum, average, and minimum test loads, respectively, for the Hot Wash/Cold Rinse cycle, as measured in sections 3.4.1 through 3.4.3 of this appendix.

EwX, Ewa, and Ewn, are reported electrical energy consumption values, in kilowatt-hours per cycle, at maximum, average, and minimum test loads, respectively, for the Warm Wash/Cold Rinse cycle, as measured in sections 3.5.1 through 3.5.3 of this appendix.

EwwX, Ewwa, and Ewwn, are reported electrical energy consumption values, in kilowatt-hours per cycle, at maximum, average, and minimum test loads, respectively, for the Warm Wash/Warm Rinse cycle, as measured in sections 3.6.1 through 3.6.3 of this appendix.

EcX, Eca, and Ecn, are reported electrical energy consumption values, in kilowatt-hours per cycle, at maximum, average, and minimum test loads, respectively, for the Cold Wash/Cold Rinse cycle, as measured in sections 3.7.1 through 3.7.3 of this appendix.

TUFm, TUFh, TUFw, TUFww, and TUFc are defined in Table 4.1.1 of this appendix.

4.1.6 Total weighted per-cycle machine electrical energy consumption. Calculate the total weighted per-cycle machine electrical energy consumption, MET, expressed in kilowatt-hours per cycle and defined as:

MET = [MEmax × Fmax] + [MEavg × Favg] + [MEmin × Fmin] where:

MEmax, MEavg, and MEmin are defined in section 4.1.5 of this appendix.

Fmax, Favg, and Fmin are defined in Table 4.1.3 of this appendix.

4.1.7 Total per-cycle energy consumption when electrically heated water is used. Calculate the total per-cycle energy consumption, ETE, using electrically heated water, expressed in kilowatt-hours per cycle and defined as:

ETE = HET + MET where: MET = As defined in section 4.1.6 of this appendix. HET = As defined in section 4.1.3 of this appendix.

4.2 Water consumption of clothes washers.

4.2.1 Per-cycle water consumption for Extra-Hot Wash/Cold Rinse. Calculate the maximum, average, and minimum total water consumption, expressed in gallons per cycle (or liters per cycle), for the Extra-Hot Wash/Cold Rinse cycle and defined as:

Qmmax = [HmX + CmX] Qmavg = [Hma + Cma] Qmmin = [Hmn + Cmn] where:

HmX, CmX, Hma, Cma, Hmn, and Cmn are defined in section 3.3 of this appendix.

4.2.2 Per-cycle water consumption for Hot Wash/Cold Rinse. Calculate the maximum, average, and minimum total water consumption, expressed in gallons per cycle (or liters per cycle), for the Hot Wash/Cold Rinse cycle and defined as:

Qhmax = [HhX + ChX] Qhavg = [Hha + Cha] Qhmin = [Hhn + Chn] where:

HhX, ChX, Hha, Cha, Hhn, and Chn are defined in section 3.4 of this appendix.

4.2.3 Per-cycle water consumption for Warm Wash/Cold Rinse. Calculate the maximum, average, and minimum total water consumption, expressed in gallons per cycle (or liters per cycle), for the Warm Wash/Cold Rinse cycle and defined as:

Qwmax = [HwX + CwX] Qwavg = [Hwa + Cwa] Qwmin = [Hwn + Cwn] where:

HwX, CwX, Hwa, Cwa, Hwn, and Cwn are defined in section 3.5 of this appendix.

4.2.4 Per-cycle water consumption for Warm Wash/Warm Rinse. Calculate the maximum, average, and minimum total water consumption, expressed in gallons per cycle (or liters per cycle), for the Warm Wash/Warm Rinse cycle and defined as:

Qwwmax = [HwwX + CwwX] Qwwavg = [Hwwa + Cwwa] Qwwmin = [Hwwn + Cwwn] where: HwwX, CwwX, Hwwa, Cwwa, Hwwn, and Cwwn are defined in section 3.6 of this appendix.

4.2.5 Per-cycle water consumption for Cold Wash/Cold Rinse. Calculate the maximum, average, and minimum total water consumption, expressed in gallons per cycle (or liters per cycle), for the Cold Wash/Cold Rinse cycle and defined as:

Qcmax = [HcX + CcX] Qcavg = [Hca + Cca] Qcmin = [Hcn + Ccn] where: HcX, CcX, Hca, Cca, Hcn, and Ccn are defined in section 3.7 of this appendix.

4.2.6 Total weighted per-cycle water consumption for Extra-Hot Wash/Cold Rinse. Calculate the total weighted per-cycle water consumption for the Extra-Hot Wash/Cold Rinse cycle, QmT, expressed in gallons per cycle (or liters per cycle) and defined as:

QmT = [Qmmax × Fmax] + [Qmavg × Favg] + [Qmmin × Fmin] where:

Qmmax, Qmavg, Qmmin are defined in section 4.2.1 of this appendix.

Fmax, Favg, Fmin are defined in Table 4.1.3 of this appendix.

4.2.7 Total weighted per-cycle water consumption for Hot Wash/Cold Rinse. Calculate the total weighted per-cycle water consumption for the Hot Wash/Cold Rinse cycle, QhT, expressed in gallons per cycle (or liters per cycle) and defined as:

QhT = [Qhmax × Fmax] + [Qhavg × Favg] + [Qhmin × Fmin] where:

Qhmax, Qhavg, Qhmin are defined in section 4.2.2 of this appendix.

Fmax, Favg, Fmin are defined in Table 4.1.3 of this appendix.

4.2.8 Total weighted per-cycle water consumption for Warm Wash/Cold Rinse. Calculate the total weighted per-cycle water consumption for the Warm Wash/Cold Rinse cycle, QwT, expressed in gallons per cycle (or liters per cycle) and defined as:

QwT = [Qwmax × Fmax] + [Qwavg × Favg] + [Qwmin × Fmin] where:

Qwmax, Qwavg, Qwmin are defined in section 4.2.3 of this appendix.

Fmax, Favg, Fmin are defined in Table 4.1.3 of this appendix.

4.2.9 Total weighted per-cycle water consumption for Warm Wash/Warm Rinse. Calculate the total weighted per-cycle water consumption for the Warm Wash/Warm Rinse cycle, QwwT, expressed in gallons per cycle (or liters per cycle) and defined as:

QwwT = [Qwwmax × Fmax] + [Qwwavg × Favg] + [Qwwmin × Fmin] where:

Qwwmax, Qwwavg, Qwwmin are defined in section 4.2.4 of this appendix.

Fmax, Favg, Fmin are defined in Table 4.1.3 of this appendix.

4.2.10 Total weighted per-cycle water consumption for Cold Wash/Cold Rinse. Calculate the total weighted per-cycle water consumption for the Cold Wash/Cold Rinse cycle, QcT, expressed in gallons per cycle (or liters per cycle) and defined as:

QcT = [Qcmax × Fmax] + [Qcavg × Favg] + [Qcmin × Fmin] where:

Qcmax, Qcavg, Qcmin are defined in section 4.2.5 of this appendix.

Fmax, Favg, Fmin are defined in Table 4.1.3 of this appendix.

4.2.11 Total weighted per-cycle water consumption for all wash cycles. Calculate the total weighted per-cycle water consumption for all wash cycles, QT, expressed in gallons per cycle (or liters per cycle) and defined as:

QT = [QmT × TUFm] + [QhT × TUFh] + [QwT × TUFw] + [QwwT × TUFww] + [QcT × TUFc] where:

QmT, QhT, QwT, QwwT, and QcT are defined in sections 4.2.6 through 4.2.10 of this appendix.

TUFm, TUFh, TUFw, TUFww, and TUFc are defined in Table 4.1.1 of this appendix.

4.2.12 Integrated water factor. Calculate the integrated water factor, IWF, expressed in gallons per cycle per cubic foot (or liters per cycle per liter), as:

IWF = QT/C where: QT = As defined in section 4.2.11 of this appendix. C = As defined in section 3.1.7 of this appendix.

4.3 Per-cycle energy consumption for removal of moisture from test load. Calculate the per-cycle energy required to remove the remaining moisture of the test load, DE, expressed in kilowatt-hours per cycle and defined as:

DE = [(Fmax × Maximum test load weight) + (Favg × Average test load weight) + (Fmin × Minimum test load weight)] × (RMCcorr - 4%) × (DEF) × (DUF)

where:

Fmax, Favg, and Fmin are defined in Table 4.1.3 of this appendix.

Maximum, average, and minimum test load weights are defined in Table 5.1 of this appendix.

RMCcorr = As defined in section 3.8.2.6, 3.8.3.5, or 3.8.4.1 of this Appendix. DEF = Nominal energy required for a clothes dryer to remove moisture from clothes = 0.5 kWh/lb (1.1 kWh/kg). DUF = Dryer usage factor, percentage of washer loads dried in a clothes dryer = 0.91.

4.4 Per-cycle combined low-power mode energy consumption. Calculate the per-cycle combined low-power mode energy consumption, ETLP, expressed in kilowatt-hours per cycle and defined as:

ETLP = [(Pdefault × Sdefault) + (Plowest × Slowest)] × Kp/295 where:

Pdefault = Default inactive/off mode power, in watts, as measured in section 3.9.3 of this appendix.

Plowest = Lowest-power inactive/off mode power, in watts, as measured in section 3.9.4 of this appendix for clothes washers with a switch, dial, or button that can be optionally selected by the end user to achieve a lower-power inactive/off mode than the default inactive/off mode; otherwise, Plowest=0. Sdefault= Annual hours in default inactive/off mode, defined as 8,465 if no optional lowest-power inactive/off mode is available; otherwise 4,232.5. Slowest= Annual hours in lowest-power inactive/off mode, defined as 0 if no optional lowest-power inactive/off mode is available; otherwise 4,232.5. Kp = Conversion factor of watt-hours to kilowatt-hours = 0.001. 295 = Representative average number of clothes washer cycles in a year. 8,465 = Combined annual hours for inactive and off mode. 4,232.5 = One-half of the combined annual hours for inactive and off mode.

4.5 Modified energy factor. Calculate the modified energy factor, MEFJ2, expressed in cubic feet per kilowatt-hour per cycle (or liters per kilowatt-hour per cycle) and defined as:

MEFJ2 = C/(ETE + DE) where: C = As defined in section 3.1.7 of this appendix. ETE = As defined in section 4.1.7 of this appendix. DE = As defined in section 4.3 of this appendix.

4.6 Integrated modified energy factor. Calculate the integrated modified energy factor, IMEF, expressed in cubic feet per kilowatt-hour per cycle (or liters per kilowatt-hour per cycle) and defined as:

IMEF = C/(ETE + DE + ETLP) where: C = As defined in section 3.1.7 of this appendix. ETE = As defined in section 4.1.7 of this appendix. DE = As defined in section 4.3 of this appendix. ETLP = As defined in section 4.4 of this appendix. 5. Test Loads [80 FR 46767, Aug. 5, 2015; 80 FR 50757, Aug. 21, 2015, as amended at 80 FR 62443, Oct. 16, 2015; 87 FR 33395, June 1, 2022; 87 FR 78820, Dec. 23, 2022]