10 CFR Part 430 - PART 430—ENERGY CONSERVATION PROGRAM FOR CONSUMER PRODUCTS

  1. Subpart A—General Provisions (§§ 430.1 - 430.5)
  2. Subpart B—Test Procedures (§§ 430.21 - 430.27)
  3. Appendix O to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Vented Home Heating Equipment
  4. Appendix P to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Pool Heaters
  5. Appendix Q to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Fluorescent Lamp Ballasts
  6. Appendix R to Subpart B of Part 430—Uniform Test Method for Measuring Electrical and Photometric Characteristics of General Service Fluorescent Lamps, Incandescent Reflector Lamps, and General Service Incandescent Lamps
  7. Appendix S to Subpart B of Part 430—Uniform Test Method for Measuring the Water Consumption of Faucets and Showerheads
  8. Appendix T to Subpart B of Part 430—Uniform Test Method for Measuring the Water Consumption of Water Closets and Urinals
  9. Appendix U to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Ceiling Fans
  10. Appendix V to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Ceiling Fan Light Kits 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)
  11. Appendix W to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Compact Fluorescent Lamps
  12. Appendix X to Subpart B of Part 430 [Reserved]
  13. Appendix X1 to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Dehumidifiers
  14. Appendix Y to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Battery Chargers
  15. Appendix Y1 to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Battery Chargers
  16. Appendix Z to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of External Power Supplies
  17. Appendix AA to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Furnace Fans
  18. Appendix BB to Subpart B of Part 430—Uniform Test Method for Measuring the Input Power, Lumen Output, Lamp Efficacy, Correlated Color Temperature (CCT), Color Rendering Index (CRI), Power Factor, Time to Failure, and Standby Mode Power of Integrated Light-Emitting Diode (LED) Lamps
  19. Appendix CC to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Portable Air Conditioners
  20. Appendix CC1 to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Portable Air Conditioners
  21. Appendix DD to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption and Energy Efficiency of General Service Lamps That Are Not General Service Incandescent Lamps, Compact Fluorescent Lamps, or Integrated LED Lamps
  22. Appendix EE to Subpart B of Part 430—Uniform Test Method For Measuring the Energy Consumption of Consumer Boilers
  23. Appendix FF to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Air Cleaners
  24. Appendix GG to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Portable Electric Spas
  25. Subpart C—Energy and Water Conservation Standards (§§ 430.31 - 430.35)
  26. Subpart D—Petitions To Exempt State Regulation From Preemption; Petitions To Withdraw Exemption of State Regulation (§§ 430.40 - 430.49)
  27. Subpart E—Small Business Exemptions (§§ 430.50 - 430.57)
  28. Subpart F [Reserved]
Authority:
42 U.S.C. 6291-6309; 28 U.S.C. 2461 note.
Source:
42 FR 27898, June 1, 1977, unless otherwise noted.
Where:
LL,A = value as defined in section 11.2.7 of ASHRAE 103-1993,
LG = value as defined in section 11.3.11.1 of ASHRAE 103-1993, at reduced input rate,
LC = value as defined in section 11.3.11.2 of ASHRAE 103-1993 at reduced input rate,
LJ = value as defined in section 11.4.8.1.1 of ASHRAE 103-1993 at maximum input rate,
tON = value as defined in section 11.4.9.11 of ASHRAE 103-1993,
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103-1993 in Btu/h,
QIN = value as defined in section 11.4.8.1.1 of ASHRAE 103-1993,
tOFF = value as defined in section 11.4.9.12 of ASHRAE 103-1993 at reduced input rate,
LS,ON = value as defined in section 11.4.10.5 of ASHRAE 103-1993 at reduced input rate,
LS,OFF = value as defined in section 11.4.10.6 of ASHRAE 103-1993 at reduced input rate,
LI,ON = value as defined in section 11.4.10.7 of ASHRAE 103-1993 at reduced input rate,
LI,OFF = value as defined in section 11.4.10.8 of ASHRAE 103-1993 at reduced input rate,
CJ = jacket loss factor and equal to:
= 0.0 for furnaces intended to be installed indoors
= 1.7 for furnaces intended to be installed as isolated combustion systems
= 3.3 for furnaces intended to be installed outdoors
LS,SS = value as defined in section 11.4.6 of ASHRAE 103-1993 at reduced input rate,
CS = value as defined in section 11.3.10.1 of ASHRAE 103-1993 at reduced input rate.

10.3 Part-Load Efficiency at Maximum Fuel Input Rate. If the option in section 8.9 of this appendix is not employed, calculate the part-load efficiency at maximum fuel input rate, EffyU,H, for condensing furnaces equipped with two-stage controls, expressed as a percent and defined as:

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Where:
LL,A = value as defined in section 11.2.7 of ASHRAE 103-1993,
LG = value as defined in section 11.3.11.1 of ASHRAE 103-1993 at maximum input rate,
LC = value as defined in section 11.3.11.2 of ASHRAE 103-1993 at maximum input rate,
LJ = value as defined in section 11.4.8.1.1 of ASHRAE 103-1993 at maximum input rate,
tON = value as defined in section 11.4.9.11 of ASHRAE 103-1993,
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103-1993 in Btu/h,
QIN = value as defined in section 11.4.8.1.1 of ASHRAE 103-1993,
tOFF = value as defined in section 11.4.9.12 of ASHRAE 103-1993 at maximum input rate,
LS,ON = value as defined in section 11.4.10.5 of ASHRAE 103-1993 at maximum input rate,
LS,OFF = value as defined in section 11.4.10.6 of ASHRAE 103-1993 at maximum input rate,
LI,ON = value as defined in section 11.4.10.7 of ASHRAE 103-1993 at maximum input rate,
LI,OFF = value as defined in section 11.4.10.8 of ASHRAE 103-1993 at maximum input rate,
CJ = value as defined in section 10.2 of this appendix,
LS,SS = value as defined in section 11.4.6 of ASHRAE 103-1993 at maximum input rate,
CS = value as defined in section 11.4.10.1 of ASHRAE 103-1993 at maximum input rate.

10.4 National average burner operating hours, average annual fuel energy consumption, and average annual auxiliary electrical energy consumption for gas or oil furnaces.

10.4.1 National average number of burner operating hours. For furnaces equipped with single-stage controls, the national average number of burner operating hours is defined as:

BOHSS = 2,080 (0.77) (A) DHR − 2,080 (B)
Where:
2,080 = national average heating load hours
0.77 = adjustment factor to adjust the calculated design heating requirement and heating load hours to the actual heating load experienced by the heating system
A = 100,000/[341,200 (yP PE + yIG PEIG + y BE) + (QIN − QP) EffyHS], for forced draft unit, indoors
= 100,000/[341,200 (yP PE Effmotor + yIG PEIG + y BE) + (QIN − QP) EffyHS], for forced draft unit, isolated combustion system,
= 100,000/[341,200 (yP PE (1 − Effmotor) + yIG PEIG + y BE) + (QIN − QP) EffyHS], for induced draft unit, indoors, and
= 100,000/[341,200 (yIG PEIG + y BE) + (QIN − QP) EffyHS], for induced draft unit, isolated combustion system.
DHR = typical design heating requirements as listed in Table 8 (in kBtu/h) of ASHRAE 103-1993, using the proper value of QOUT defined in section 11.2.8.1 of ASHRAE 103-1993.
B = 2 QP (EffyHS) (A)/100,000
Where:
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.
100,000 = factor that accounts for percent and kBtu
yP = ratio of induced or forced draft blower on-time to average burner on-time, as follows:
1 for units without post-purge;
1 + (tP/3.87) for single stage furnaces with post purge; or
1 + (tP/10) for two-stage and step modulating furnaces with post purge.
PE = all electrical power related to burner operation at full load steady-state operation, including electrical ignition device if energized, controls, gas valve or oil control valve, and draft inducer, as determined in section 8.2 of this appendix.
yIG = ratio of burner interrupted ignition device on-time to average burner on-time, as follows:
0 for burners not equipped with interrupted ignition device;
(tIG/3.87) for single-stage furnaces; or
(tIG/10) for two-stage and step modulating furnaces;
PEIG = electrical input rate to the interrupted ignition device on burner (if employed), as defined in section 8.3 of this appendix
y = ratio of blower on-time to average burner on-time, as follows:
1 for furnaces without fan delay;
1 + (t +−t−)/3.87 for single-stage furnaces with fan delay; or
1 + (t +−t−)/10 for two-stage and step modulating furnaces with fan delay.
BE = circulating air fan electrical energy input rate at full-load steady-state operation as defined in section 8.2 of this appendix.
tP = post-purge time as defined in section 8.5 of this appendix
= 0 if tP is equal to or less than 30 seconds
tIG = on-time of the burner interrupted ignition device, as defined in section 8.3 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103-1993
QP = as defined in section 11.2.11 of ASHRAE 103-1993
EffyHS = as defined in section 11.2.11 (non-condensing systems) or section 11.3.11.3 (condensing systems) of ASHRAE 103-1993, percent, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or outdoor installation, for furnaces that are weatherized.
2 = ratio of the average length of the heating season in hours to the average heating load hours
t + = delay time between burner shutoff and the blower shutoff measured as defined in section 9.5.1.2 of ASHRAE 103-1993
t− = as defined in section 9.6.1 of ASHRAE 103-1993

10.4.1.1 For furnaces equipped with two stage or step modulating controls the average annual energy used during the heating season, EM, is defined as:

EM = (QIN−QP) BOHSS + (8,760−4,600) QP
Where:
QIN = as defined in section 11.4.8.1.1 of ASHRAE 103-1993
QP = as defined in section 11.4.12 of ASHRAE 103-1993
BOHSS = as defined in section 10.4.1 of this appendix, in which the weighted EffyHS as defined in section 11.4.11.3 or 11.5.11.3 of ASHRAE 103-1993 is used for calculating the values of A and B, the term DHR is based on the value of QOUT defined in section 11.4.8.1.1 or 11.5.8.1.1 of ASHRAE 103-1993, and the term (yPPE + yIGPEIG + yBE) in the factor A is increased by the factor R, which is defined as:
R = 2.3 for two stage controls
= 2.3 for step modulating controls when the ratio of minimum-to-maximum output is greater than or equal to 0.5
= 3.0 for step modulating controls when the ratio of minimum-to-maximum output is less than 0.5
A = 100,000/[341,200 (yP PE + yIG PEIG + y BE) R + (QIN−QP) EffyHS], for forced draft unit, indoors
= 100,000/[341,200 (yP PE Effmotor + yIG PEIG + y BE) R + (QIN−QP) EffyHS], for forced draft unit, isolated combustion system,
= 100,000/[341,200 (yP PE (1−Effmotor) + yIG PEIG + y BE) R + (QIN−QP) EffyHS], for induced draft unit, indoors, and
= 100,000/[341,200 (yIG PEIG + y BE) R + (QIN−QP) EffyHS], for induced draft unit, isolated combustion system.
Where:
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.
EffyHS = as defined in section 11.4.11.3 or 11.5.11.3 of ASHRAE 103-1993, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or outdoor installation, for furnaces that are weatherized.
8,760 = total number of hours per year
4,600 = as defined in section 11.4.12 of ASHRAE 103-1993

10.4.1.2 For furnaces equipped with two-stage or step-modulating controls, the national average number of burner operating hours at the reduced operating mode (BOHR) is defined as:

BOHR = XR EM/QIN,R
Where:
XR = as defined in section 11.4.8.7 of ASHRAE 103-1993
EM = as defined in section 10.4.1.1 of this appendix
QIN,R = as defined in section 11.4.8.1.2 of ASHRAE 103-1993

10.4.1.3 For furnaces equipped with two-stage controls, the national average number of burner operating hours at the maximum operating mode (BOHH) is defined as:

BOHH = XH EM/QIN
Where:
XH = as defined in section 11.4.8.6 of ASHRAE 103-1993
EM = as defined in section 10.4.1.1 of this appendix
QIN = as defined in section 11.4.8.1.1 of ASHRAE 103-1993

10.4.1.4 For furnaces equipped with step-modulating controls, the national average number of burner operating hours at the modulating operating mode (BOHM) is defined as:

BOHM = XH EM/QIN,M
Where:
XH = as defined in section 11.4.8.6 of ASHRAE 103-1993
EM = as defined in section 10.4.1.1 of this appendix
QIN,M = QOUT,M/(EffySS,M/100)
QOUT,M = as defined in section 11.4.8.10 or 11.5.8.10 of ASHRAE 103-1993, as appropriate
EffySS,M = as defined in section 11.4.8.8 or 11.5.8.8 of ASHRAE 103-1993, as appropriate, in percent
100 = factor that accounts for percent

10.4.2 Average annual fuel energy consumption for gas or oil fueled furnaces. For furnaces equipped with single-stage controls, the average annual fuel energy consumption (EF) is expressed in Btu per year and defined as:

EF = BOHSS (QIN−QP) + 8,760 QP
Where:
BOHSS = as defined in section 10.4.1 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103-1993
QP = as defined in section 11.2.11 of ASHRAE 103-1993
8,760 = as defined in section 10.4.1.1 of this appendix

10.4.2.1 For furnaces equipped with either two-stage or step modulating controls, EF is defined as:

EF = EM + 4,600 QP
Where:
EM = as defined in section 10.4.1.1 of this appendix
4,600 = as defined in section 11.4.12 of ASHRAE 103-1993
QP = as defined in section 11.2.11 of ASHRAE 103-1993

10.4.2.2 [Reserved]

10.4.3 Average annual auxiliary electrical energy consumption for gas or oil-fueled furnaces. For furnaces equipped with single-stage controls, the average annual auxiliary electrical consumption (EAE) is expressed in kilowatt-hours and defined as:

EAE = BOHSS (yP PE + yIG PEIG + yBE) + ESO
Where:
BOHSS = as defined in section 10.4.1 of this appendix
yP = as defined in section 10.4.1 of this appendix
PE = as defined in section 10.4.1 of this appendix
yIG = as defined in section 10.4.1 of this appendix
PEIG = as defined in section 10.4.1 of this appendix
y = as defined in section 10.4.1 of this appendix
BE = as defined in section 10.4.1 of this appendix
ESO = as defined in section 10.11 of this appendix

10.4.3.1 For furnaces equipped with two-stage controls, EAE is defined as:

EAE = BOHR (yP PER + yIG PEIG + yBER) + BOHH (yP PEH + yIG PEIG + y BEH) + ESO
Where:
BOHR = as defined in section 10.4.1.2 of this appendix
yP = as defined in section 10.4.1 of this appendix
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG = as defined in section 10.4.1 of this appendix
PEIG = as defined in section 10.4.1 of this appendix
y = as defined in section 10.4.1 of this appendix
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
BOHH = as defined in section 10.4.1.3 of this appendix
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
ESO = as defined in section 10.11 of this appendix

10.4.3.2 For furnaces equipped with step-modulating controls, EAE is defined as:

EAE = BOHR (yP PER + yIG PEIG + y BER) + BOHM (yP PEH + yIG PEIG + y BEH) + ESO
Where:
BOHR = as defined in section 10.4.1.2 of this appendix
yP = as defined in section 10.4.1 of this appendix
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG = as defined in section 10.4.1 of this appendix
PEIG = as defined in section 10.4.1 of this appendix
y = as defined in section 10.4.1 of this appendix
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
BOHM = as defined in 10.4.1.4 of this appendix
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
ESO = as defined in section 10.11 of this appendix

10.5 Average annual electric energy consumption for electric furnaces. For electric furnaces, the average annual electrical energy consumption (EE) is expressed in kilowatt-hours and defined as:

EE = 100 (2,080) (0.77) DHR/(3.412 AFUE) + ESO
Where:
100 = to express a percent as a decimal
2,080 = as defined in section 10.4.1 of this appendix
0.77 = as defined in section 10.4.1 of this appendix
DHR = as defined in section 10.4.1 of this appendix
3.412 = conversion factor from watt-hours to Btu
AFUE = as defined in section 11.1 of ASHRAE 103-1993, in percent, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or
outdoor installation, for furnaces that are weatherized.
ESO = as defined in section 10.11 of this appendix.

10.6 Energy factor.

10.6.1 Energy factor for gas or oil furnaces. Calculate the energy factor, EF, for gas or oil furnaces defined as, in percent:

EF = (EF−4,600 (QP))(EffyHS)/(EF + 3,412 (EAE))
Where:
EF = average annual fuel consumption as defined in section 10.4.2 of this appendix
4,600 = as defined in section 11.4.12 of ASHRAE 103-1993
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103-1993 in Btu/h
EffyHS = annual fuel utilization efficiency as defined in sections 11.2.11, 11.3.11, 11.4.11 or 11.5.11 of ASHRAE 103-1993, in percent, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or
outdoor installation, for furnaces that are weatherized.
3,412 = conversion factor from kW to Btu/h
EAE = as defined in section 10.4.3 of this appendix

10.6.2 Energy factor for electric furnaces. The energy factor, EF, for electric furnaces is defined as:

EF = AFUE
Where:
AFUE = annual fuel utilization efficiency as defined in section 10.4.3 of this appendix, in percent

10.7 Average annual energy consumption for furnaces located in a different geographic region of the United States and in buildings with different design heating requirements.

10.7.1 Average annual fuel energy consumption for gas or oil-fueled furnaces located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled furnaces, the average annual fuel energy consumption for a specific geographic region and a specific typical design heating requirement (EFR) is expressed in Btu per year and defined as:

EFR = (EF−8,760 QP) (HLH/2,080) + 8,760 QP
Where:
EF = as defined in section 10.4.2 of this appendix
8,760 = as defined in section 10.4.1.1 of this appendix
QP = as defined in section 11.2.11 of ASHRAE 103-1993
HLH = heating load hours for a specific geographic region determined from the heating load hour map in Figure 1 of this appendix
2,080 = as defined in section 10.4.1 of this appendix

10.7.2 Average annual auxiliary electrical energy consumption for gas or oil-fueled furnaces located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled furnaces, the average annual auxiliary electrical energy consumption for a specific geographic region and a specific typical design heating requirement (EAER) is expressed in kilowatt-hours and defined as:

EAER = (EAE−ESO) (HLH/2080) + ESOR
Where:
EAE = as defined in section 10.4.3 of this appendix
ESO = as defined in section 10.11 of this appendix
HLH = as defined in section 10.7.1 of this appendix
2,080 = as defined in section 10.4.1 of this appendix
ESOR = as defined in section 10.7.3 of this appendix.

10.7.3 Average annual electric energy consumption for electric furnaces located in a different geographic region of the United States and in buildings with different design heating requirements. For electric furnaces, the average annual electric energy consumption for a specific geographic region and a specific typical design heating requirement (EER) is expressed in kilowatt-hours and defined as:

EER = 100 (0.77) DHR HLH/(3.412 AFUE) + ESOR
Where:
100 = as defined in section 10.4.3 of this appendix
0.77 = as defined in section 10.4.1 of this appendix
DHR = as defined in section 10.4.1 of this appendix
HLH = as defined in section 10.7.1 of this appendix
3.412 = as defined in section 10.4.3 of this appendix
AFUE = as defined in section 10.4.3 of this appendix
ESOR = ESO as defined in section 10.11 of this appendix, except that in the equation for ESO, the term BOH is multiplied by the expression (HLH/2080) to get the appropriate regional accounting of standby mode and off mode loss.

10.8 Annual energy consumption for mobile home furnaces

10.8.1 National average number of burner operating hours for mobile home furnaces (BOHSS). BOHSS is the same as in section 10.4.1 of this appendix, except that the value of EffyHS in the calculation of the burner operating hours, BOHSS, is calculated on the basis of a direct vent unit with system number 9 or 10.

10.8.2 Average annual fuel energy for mobile home furnaces (EF). EF is same as in section 10.4.2 of this appendix except that the burner operating hours, BOHSS, is calculated as specified in section 10.8.1 of this appendix.

10.8.3 Average annual auxiliary electrical energy consumption for mobile home furnaces (EAE). EAE is the same as in section 10.4.3 of this appendix, except that the burner operating hours, BOHSS, is calculated as specified in section 10.8.1 of this appendix.

10.9 Calculation of sales weighted average annual energy consumption for mobile home furnaces. To reflect the distribution of mobile homes to geographical regions with average HLHMHF values different from 2,080, adjust the annual fossil fuel and auxiliary electrical energy consumption values for mobile home furnaces using the following adjustment calculations.

10.9.1 For mobile home furnaces, the sales weighted average annual fossil fuel energy consumption is expressed in Btu per year and defined as:

EF,MHF = (EF−8,760 QP) HLHMHF/2,080 + 8,760 QP
Where:
EF = as defined in section 10.8.2 of this appendix
8,760 = as defined in section 10.4.1.1 of this appendix
QP = as defined in section 10.2 of this appendix
HLHMHF = 1880, sales weighted average heating load hours for mobile home furnaces
2,080 = as defined in section 10.4.1 of this appendix

10.9.2 For mobile home furnaces, the sales-weighted-average annual auxiliary electrical energy consumption is expressed in kilowatt-hours and defined as:

EAE,MHF = EAE HLHMHF/2,080
Where:
EAE = as defined in section 10.8.3 of this appendix
HLHMHF = as defined in section 10.9.1 of this appendix
2,080 = as defined in section 10.4.1 of this appendix

10.10 [Reserved]

10.11 Average annual electrical standby mode and off mode energy consumption. Calculate the annual electrical standby mode and off mode energy consumption (ESO) in kilowatt-hours, defined as:

ESO = (PW,SB (4160−BOH) + 4600 PW,OFF) K
Where:
PW,SB = furnace standby mode power, in watts, as measured in section 8.10.1 of this appendix
4,160 = average heating season hours per year
BOH = total burner operating hours as calculated in section 10.4 of this appendix for gas or oil-fueled furnaces. Where for gas or oil-fueled furnaces equipped with single-stage controls, BOH = BOHSS; for gas or oil-fueled furnaces equipped with two-stage controls, BOH = (BOHR + BOHH); and for gas or oil-fueled furnaces equipped with step-modulating controls, BOH = (BOHR + BOHM). For electric furnaces, BOH = 100(2080)(0.77)DHR/(Ein 3.412(AFUE))
4,600 = as defined in section 11.4.12 of ASHRAE 103-1993
PW,OFF = furnace off mode power, in watts, as measured in section 8.10.2 of this appendix
K = 0.001 kWh/Wh, conversion factor from watt-hours to kilowatt-hours
Where:
100 = to express a percent as a decimal
2,080 = as defined in section 10.4.1 of this appendix
0.77 = as defined in section 10.4.1 of this appendix
DHR = as defined in section 10.4.1 of this appendix
Ein = steady-state electric rated power, in kilowatts, from section 9.3 of ASHRAE 103-1993
3.412 = as defined in section 10.4.3 of this appendix
AFUE = as defined in section 11.1 of ASHRAE 103-1993 in percent
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[88 FR 15538, Mar. 13, 2023]