10 CFR Part 430, Subpart B, Appendix N to Subpart B of Part 430 - Uniform Test Method for Measuring the Energy Consumption of Furnaces and Boilers

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View PDF at GPO Pt. 430, Subpt. B, App. N
Appendix N to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Furnaces and Boilers
Link to an amendment published at 77 FR 76839, Dec. 31, 2012.
Note:
The procedures and calculations that refer to off mode energy consumption (i.e.,sections 8.6 and 10.9 of this appendix N) need not be performed to determine compliance with energy conservation standards for furnaces and boilers at this time. However, any representation related to standby mode and off mode energy consumption of these products made after April 18, 2011 must be based upon results generated under this test procedure, consistent with the requirements of 42 U.S.C. 6293(c)(2). For furnaces manufactured on or after May 1, 2013, compliance with the applicable provisions of this test procedure is required in order to determine compliance with energy conservation standards. For boilers, the statute requires that after July 1, 2010, any adopted energy conservation standard shall address standby mode and off mode energy consumption for these products, and upon the compliance date for such standards, compliance with the applicable provisions of this test procedure will be required.
1.0Scope. The scope of this appendix is as specified in section 2.0 of ANSI/ASHRAE Standard 103-1993.
2.0Definitions. Definitions include the definitions specified in section 3 of ANSI/ASHRAE Standard 103-1993 and the following additional and modified definitions:
2.1Active mode means the condition during the heating season in which the furnace or boiler is connected to the power source, and either the burner, electric resistance elements, or any electrical auxiliaries such as blowers or pumps, are activated.
2.2ANSI/ASHRAE Standard 103-1993 means the test standard published in 1993 by ASHRAE, approved by the American National Standards Institute (ANSI) on October 4, 1993, and entitled “Method of Testing for Annual Fuel Utilization Efficiency of Residential Central Furnaces and Boilers” (with errata of October 24, 1996).
2.3ASHRAE means the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
2.4IEC 62301 means the test standard published by the International Electrotechnical Commission (IEC), titled “Household electrical appliances—Measurement of standby power,” Publication 62301 (First Edition 2005-06). (incorporated by reference, see§ 430.3)
2.5Isolated combustion system. The definition of isolation combustion system in section 3 of ANSI/ASHRAE Standard 103-1993 is incorporated with the addition of the following: “The unit is installed in an un-conditioned indoor space isolated from the heated space.”
2.6Off mode means the condition during the non-heating season in which the furnace or boiler is connected to the power source, and neither the burner, electric resistance elements, nor any electrical auxiliaries such as blowers or pumps, are activated.
2.7Seasonal off switch means the switch on the furnace or boiler that, when activated, results in a measurable change in energy consumption between the standby and off modes.
2.8Standby mode means the condition during the heating season in which the furnace or boiler is connected to the power source, and neither the burner, electric resistance elements, nor any electrical auxiliaries such as blowers or pumps, are activated.
2.9Thermal stack damper means a type of stack damper which is dependent for operation exclusively upon the direct conversion of thermal energy of the stack gases to open the damper.
3.0Classifications. Classifications are as specified in section 4 of ANSI/ASHRAE Standard 103-1993.
4.0Requirements. Requirements are as specified in section 5 of ANSI/ASHRAE Standard 103-1993.
5.0Instruments. Instruments must be as specified in section 6 of ANSI/ASHRAE Standard 103-1993.
6.0Apparatus. The apparatus used in conjunction with the furnace or boiler during the testing shall be as specified in section 7 of ANSI/ASHRAE Standard 103-1993 except for the second paragraph of section 7.2.2.2 and except for section 7.2.2.5, and as specified in section 6.1 of this appendix.
6.1Downflow furnaces. Install the internal section of vent pipe the same size as the flue collar for connecting the flue collar to the top of the unit, if not supplied by the manufacturer. Do not insulate the internal vent pipe during the jacket loss test (if conducted) described in section 8.6 of ANSI/ASHRAE Standard 103-1993 or the steady-state test described in section 9.1 of ANSI/ASHRAE Standard 103-1993. Do not insulate the internal vent pipe before the cool-down and heat-up tests described in sections 9.5 and 9.6, respectively, of ANSI/ASHRAE Standard 103-1993. If the vent pipe is surrounded by a metal jacket, do not insulate the metal jacket. Install a 5-ft test stack of the same cross sectional area or perimeter as the vent pipe above the top of the furnace. Tape or seal around the junction connecting the vent pipe and the 5-ft test stack. Insulate the 5-ft test stack with insulation having an R-value not less than 7 and an outer layer of aluminum foil. (See Figure 3-E of ANSI/ASHRAE Standard 103-1993.)
7.0Testing conditions. The testing conditions shall be as specified in section 8 of ANSI/ASHRAE Standard 103-1993 with errata of October 24, 1996, except for section 8.6.1.1; and as specified in section 7.1 of this appendix.
7.1Measurement of jacket surface temperature. The jacket of the furnace or boiler shall be subdivided into 6-inch squares when practical, and otherwise into 36-square-inch regions comprising 4 in. × 9 in. or 3 in. × 12 in. sections, and the surface temperature at the center of each square or section shall be determined with a surface thermocouple. The 36-square-inch areas shall be recorded in groups where the temperature differential of the 36-square-inch area is less than 10 °F for temperature up to 100 °F above room temperature and less than 20 °F for temperature more than 100 °F above room temperature. For forced air central furnaces, the circulating air blower compartment is considered as part of the duct system and no surface temperature measurement of the blower compartment needs to be recorded for the purpose of this test. For downflow furnaces, measure all cabinet surface temperatures of the heat exchanger and combustion section, including the bottom around the outlet duct, and the burner door, using the 36 square-inch thermocouple grid. The cabinet surface temperatures around the blower section do not need to be measured (See figure 3-E of ANSI/ASHRAE Standard 103-1993.)
8.0Test procedure. Testing and measurements shall be as specified in section 9 of ANSI/ASHRAE Standard 103-1993 except for sections 9.5.1.1, 9.5.1.2.1, 9.5.1.2.2, 9.5.2.1, and section 9.7.1. ; and as specified in sections 8.1, 8.2, 8.3, 8.4, and 8.5, of this appendix.
8.1Input to interrupted ignition device. For burners equipped with an interrupted ignition device, record the nameplate electric power used by the ignition device, PEIG, or use PEIG=0.4 kW if no nameplate power input is provided. Record the nameplate ignition device on-time interval, tIG, or measure the on-time period at the beginning of the test at the time the burner is turned on with a stop watch, if no nameplate value is given. Set tIG=0 and PEIG=0 if the device on-time is less than or equal to 5 seconds after the burner is on.
8.2Gas- and oil-fueled gravity and forced air central furnaces without stack dampers cool-down test. Turn off the main burner after steady-state testing is completed, and measure the flue gas temperature by means of the thermocouple grid described in section 7.6 of ANSI/ASHRAE 103-1993 at 1.5 minutes (TF,OFF(t3)) and 9 minutes (TF,OFF(t4)) after the burner shuts off. An integral draft diverter shall remain blocked and insulated, and the stack restriction shall remain in place. On atmospheric systems with an integral draft diverter or draft hood, equipped with either an electromechanical inlet damper or an electro-mechanical flue damper that closes within 10 seconds after the burner shuts off to restrict the flow through the heat exchanger in the off-cycle, bypass or adjust the control for the electromechanical damper so that the damper remains open during the cool-down test. For furnaces that employ post purge, measure the length of the post-purge period with a stopwatch. The time from burner OFF to combustion blower OFF (electrically de-energized) shall be recorded as tp. For the case where tp is intended to be greater than 180 seconds, stop the combustion blower at 180 seconds and use that value for tp. Measure the flue gas temperature by means of the thermocouple grid described in section 7.6 of ANSI/ASHRAE 103-1993 at the end of post-purge period, tp (TF,OFF(tp)), and at the time (1.5 tp) minutes (TF,OFF(t3)) and (9.0 tp) minutes (TF,OFF(t4)) after the main burner shuts off. For the case where the measured tp is less than or equal to 30 seconds, it shall be tested as if there is no post purge and tp shall be set equal to 0.
8.3Gas- and oil-fueled gravity and forced air central furnaces without stack dampers with adjustable fan control—cool-down test. For a furnace with adjustable fan control, this time delay will be 3.0 minutes for non-condensing furnaces or 1.5 minutes for condensing furnaces or until the supply air temperature drops to a value of 40 °F above the inlet air temperature, whichever results in the longest fan on-time. For a furnace without adjustable fan control or with the type of adjustable fan control whose range of adjustment does not allow for the delay time specified above, the control shall be bypassed and the fan manually controlled to give the delay times specified above. For a furnace which employs a single motor to drive the power burner and the indoor air circulating blower, the power burner and indoor air circulating blower shall be stopped together.
8.4Gas-and oil-fueled boilers without stack dampers cool-down test. After steady-state testing has been completed, turn the main burner(s) OFF and measure the flue gas temperature at 3.75 (TF,OFF(t3)) and 22.5 (TF,OFF(t4)) minutes after the burner shut off, using the thermocouple grid described in section 7.6 of ANSI/ASHRAE 103-1993. During this off-period, for units that do not have pump delay after shutoff, no water shall be allowed to circulate through the hot water boilers. For units that have pump delay on shutoff, except those having pump controls sensing water temperature, the pump shall be stopped by the unit control and the time t , between burner shutoff and pump shutoff shall be measured within one-second accuracy. For units having pump delay controls that sense water temperature, the pump shall be operated for 15 minutes and t shall be 15 minutes. While the pump is operating, the inlet water temperature and flow rate shall be maintained at the same values as used during the steady-state test as specified in sections 9.1 and 8.4.2.3 of ANSI/ASHRAE 103-1993.
For boilers that employ post purge, measure the length of the post-purge period with a stopwatch. The time from burner OFF to combustion blower OFF (electrically de-energized) shall be recorded as tP. For the case where tP is intended to be greater than 180 seconds, stop the combustion blower at 180 seconds and use that value for tP. Measure the flue gas temperature by means of the thermocouple grid described in section 7.6 of ANSI/ASHRAE 103-1993 at the end of the post purge period tP(TF,OFF(tP)) and at the time (3.75 tP) minutes (TF,OFF(t3)) and (22.5 tP) minutes (TF,OFF(t4)) after the main burner shuts off. For the case where the measured tP is less or equal to 30 seconds, it shall be tested as if there is no post purge and tP shall be set to equal 0.
8.5Direct measurement of off-cycle losses testing method. [Reserved.]
8.6Measurement of electrical standby and off mode power.
8.6.1Standby power measurement. With all electrical auxiliaries of the furnace or boiler not activated, measure the standby power (PW,SB) in accordance with the procedures in IEC 62301 (incorporated by reference, see§ 430.3), except that section 8.5 Room Ambient Temperature of ASHRAE 103—1993 (incorporated by reference, see§ 430.3) and the voltage provision of section 8.2.1.4 Electrical Supply of ASHRAE 103—1993 shall apply in lieu of the corresponding provisions of IEC 62301 at section 4.2 Test room and the voltage specification of section 4.3 Power supply. Frequency shall be 60Hz. Clarifying further, IEC 62301 section 4.5 Power measurement accuracy and section 5Measurements shall apply in lieu of section 6.10 Energy Flow Rate of ASHRAE 103—1993. Measure the wattage so that all possible standby mode wattage for the entire appliance is recorded, not just the standby mode wattage of a single auxiliary.
8.6.2Off mode power measurement. If the unit is equipped with a seasonal off switch or there is an expected difference between off mode power and standby mode power, measure off mode power (PW,OFF) in accordance with the standby power procedures in IEC 62301 (incorporated by reference, see§ 430.3), except that section 8.5 Room Ambient Temperature of ASHRAE 103—1993 (incorporated by reference, see§ 430.3) and the voltage provision of section 8.2.1.4 Electrical Supply of ASHRAE 103—1993 shall apply in lieu of the corresponding provisions of IEC 62301 at section 4.2 Test room and the voltage specification of section 4.3 Power supply. Frequency shall be 60Hz. Clarifying further, IEC 62301 section 4.5 Power measurement accuracy and section 5Measurements shall apply for this measurement in lieu of section 6.10 Energy Flow Rate of ASHRAE 103—1993. Measure the wattage so that all possible off mode wattage for the entire appliance is recorded, not just the off mode wattage of a single auxiliary. If there is no expected difference in off mode power and standby mode power, let PW,OFF = PW,SB, in which case no separate measurement of off mode power is necessary.
9.0Nomenclature. Nomenclature shall include the nomenclature specified in section 10 of ANSI/ASHRAE Standard 103-1993 and the following additional variables:
Effmotor=Efficiency of power burner motor
PEIG=Electrical power to the interrupted ignition device, kW
RT,a=RT,F if flue gas is measured
=RT,S if stack gas is measured
RT,F=Ratio of combustion air mass flow rate to stoichiometric air mass flow rate
RT,S=Ratio of the sum of combustion air and relief air mass flow rate to stoichiometric air mass flow rate
tIG=Electrical interrupted ignition device on-time, min.
Ta,SS,X=TF,SS,X if flue gas temperature is measured, °F
=TS,SS,X if stack gas temperature is measured, °F
yIG=ratio of electrical interrupted ignition device on-time to average burner on-time
yP=ratio of power burner combustion blower on-time to average burner on-time
ESO = Average annual electric standby mode and off mode energy consumption, in kilowatt-hours
PW,OFF = Furnace or boiler off mode power, in watts
PW,SB = Furnace or boiler standby mode power, in watts
10.0Calculation of derived results from test measurements. Calculations shall be as specified in section 11 of ANSI/ASHRAE Standard 103-1993 and the October 24, 1996, Errata Sheet for ASHRAE Standard 103-1993, except for appendices B and C; and as specified in sections 10.1 through 10.8 and Figure 1 of this appendix.
10.1Annual fuel utilization efficiency. The annual fuel utilization efficiency (AFUE) is as defined in sections 11.2.12 (non-condensing systems), 11.3.12 (condensing systems), 11.4.12 (non-condensing modulating systems) and 11.5.12 (condensing modulating systems) of ANSI/ASHRAE Standard 103-1993, except for the definition for the term EffyHS in the defining equation for AFUE. EffyHS is defined as:
EffyHS=heating seasonal efficiency as defined in sections 11.2.11 (non-condensing systems), 11.3.11 (condensing systems), 11.4.11 (non-condensing modulating systems) and 11.5.11 (condensing modulating systems) of ANSI/ASHRAE Standard 103-1993 and is based on the assumptions that all weatherized warm air furnaces or boilers are located out-of-doors, that warm air furnaces which are not weatherized are installed as isolated combustion systems, and that boilers which are not weatherized are installed indoors.
10.2National average burner operating hours, average annual fuel energy consumption and average annual auxiliary electrical energy consumption for gas or oil furnaces and boilers.
10.2.1National average number of burner operating hours. For furnaces and boilers 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
DHR=typical design heating requirements as listed in Table 8 (in unit of kBtu/h) of ANSI/ASHRAE Standard 103-1993, using the proper value of QOUT defined in 11.2.8.1 of ANSI/ASHRAE Standard 103-1993
A=100,000 / [341,300(yPPE yIGPEIG yBE) (QIN-QP)EffyHS], for forced draft unit, indoors
=100,000 / [341,300(yPPE Effmotor yIGPEIG y BE) (QIN-QP)EffyHS], for forced draft unit, ICS,
=100,000 / [341,300(yPPE(1-Effmotor) yIGPEIG y BE) (QIN-QP)EffyHS], for induced draft unit, indoors, and
=100,000 / [341,300(yIGPEIG yBE) (QIN-QP)EffyHS], for induced draft unit, ICS
B=2 QP(EffyHS)(A) / 100,000
where:
Effmotor=Power burner motor efficiency provided by manufacturer,
=0.50, an assumed default power burner efficiency if not provided by manufacturer.
100,000=factor that accounts for percent and kBtu
PE=burner electrical power input at full-load steady-state operation, including electrical ignition device if energized, as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-1993
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;
1 (tP/10) for two-stage and step modulating furnaces with post purge;
1 (tP/9.68) for single stage boilers with post purge; or
1 (tP/15) for two stage and step modulating boilers with post purge.
PEIG=electrical input rate to the interrupted ignition device on burner (if employed), as defined in 8.1 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;
(tIG/10) for two-stage and step modulating furnaces;
(tIG/9.68) for single stage boilers; or
(tIG/15) for two stage and step modulating boilers.
tIG=on-time of the burner interrupted ignition device, as defined in 8.1 of this appendix
tP=post purge time as defined in 8.2 (furnace) or 8.4 (boiler) of this appendix
=0 if tP is equal to or less than 30 second.
y=ratio of blower or pump on-time to average burner on-time, as follows:
1 for furnaces without fan delay;
1 for boilers without a pump delay;
1 (t —t)/3.87 for single stage furnaces with fan delay;
1 (t —t)/10 for two-stage and step modulating furnaces with fan delay;
1 (t /9.68) for single stage boilers with pump delay; or
1 (t /15) for two stage and step modulating boilers with pump delay.
BE=circulating air fan or water pump electrical energy input rate at full load steady-state operation, as defined in ANSI/ASHRAE Standard 103-1993
QIN=as defined in 11.2.8.1 of ANSI/ASHRAE Standard 103-1993
QP=as defined in 11.2.11 of ANSI/ASHRAE Standard 103-1993
EffyHS=as defined in 11.2.11 (non-condensing systems) or 11.3.11.3 (condensing systems) of ANSI/ASHRAE Standard 103-1993, percent, and calculated on the basis of:
ICS installation, for non-weatherized warm air furnaces;
indoor installation, for non-weatherized boilers; or
outdoor installation, for furnaces and boilers that are weatherized.
2=ratio of the average length of the heating season in hours to the average heating load hours
t =as defined in 9.5.1.2 of ANSI/ASHRAE Standard 103-1993 or 8.4 of this appendix
t=as defined in 9.6.1 of ANSI/ASHRAE Standard 103-1993
10.2.1.1For furnaces and boilers 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 11.4.8.1.1 of ANSI/ASHRAE Standard 103-1993
QP=as defined in 11.4.12 of ANSI/ASHRAE Standard 103-1993
BOHSS=as defined in section 10.2.1 of this appendix, in which the weighted EffyHS as defined in 11.4.11.3 or 11.5.11.3 of ANSI/ASHRAE Standard 103-1993 is used for calculating the values of A and B, the term DHR is based on the value of QOUT defined in 11.4.8.1.1 or 11.5.8.1.1 of ANSI/ASHRAE Standard 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/[341,300(yPPE yIGPEIG y BE) R (QIN−QP) EffyHS], for forced draft unit, indoors
=100,000/[341,300(yPPE Effmotor yIGPEIG y BE) R (QIN−QP)EffyHS], for forced draft unit, ICS,
=100,000/[341,300(yPPE(1-Effmotor) yIGPEIG y BE) R (QIN−QP) EffyHS], for induced draft unit, indoors, and
=100,000/[341,300(yIGPEIG y BE) R (QIN−QP) EffyHS], for induced draft unit, ICS
where:
Effmotor=Power burner motor efficiency provided by manufacturer,
=0.50, an assumed default power burner efficiency if none provided by manufacturer.
EffyHS=as defined in 11.4.11.3 or 11.5.11.3 of ANSI/ASHRAE Standard 103-1993, and calculated on the basis of:
—ICS installation, for non-weatherized warm air furnaces
—indoor installation, for non-weatherized boilers
—outdoor installation, for furnaces and boilers that are weatherized
8,760=total number of hours per year
4,600=as specified in 11.4.12 of ANSI/ASHRAE Standard 103-1993
10.2.1.2For furnaces and boilers equipped with two stage or step modulating controls the national average number of burner operating hours at the reduced operating mode is defined as:
BOHR=XREM/QIN,R
where:
XR=as defined in 11.4.8.7 of ANSI/ASHRAE Standard 103-1993
EM=as defined in section 10.2.1.1 of this appendix
QIN,R=as defined in 11.4.8.1.2 of ANSI/ASHRAE Standard 103-1993
10.2.1.3For furnaces and boilers equipped with two stage controls the national average number of burner operating hours at the maximum operating mode (BOHH) is defined as:
BOHH=XHEM/QIN
where:
XH=as defined in 11.4.8.6 of ANSI/ASHRAE Standard 103-1993
EM=as defined in section 10.2.1.1 of this appendix
QIN=as defined in 11.4.8.1.1 of ANSI/ASHRAE Standard 103-1993
10.2.1.4For furnaces and boilers equipped with step modulating controls the national average number of burner operating hours at the modulating operating mode (BOHM) is defined as:
BOHM=XHEM/QIN,M
where:
XH=as defined in 11.4.8.6 of ANSI/ASHRAE Standard 103-1993
EM=as defined in section 10.2.1.1 of this appendix
QIN,M=QOUT,M/(EffySS,M/100)
QOUT,M=as defined in 11.4.8.10 or 11.5.8.10 of ANSI/ASHRAE Standard 103-1993, as appropriate
EffySS,M=as defined in 11.4.8.8 or 11.5.8.8 of ANSI/ASHRAE Standard 103-1993, as appropriate, in percent
100=factor that accounts for percent
10.2.2Average annual fuel energy consumption for gas or oil fueled furnaces or boilers. For furnaces or boilers 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 10.2.1 of this appendix
QIN=as defined in 11.2.8.1 of ANSI/ASHRAE Standard 103-1993
QP=as defined in 11.2.11 of ANSI/ASHRAE Standard 103-1993
8,760=as specified in 10.2.1 of this appendix
10.2.2.1For furnaces or boilers equipped with either two stage or step modulating controls EF is defined as:
EF=EM 4,600QP
where:
EM=as defined in 10.2.1.1 of this appendix
4,600=as specified in 11.4.12 of ANSI/ASHRAE Standard 103-1993
QP=as defined in 11.2.11 of ANSI/ASHRAE Standard 103-1993
10.2.3Average annual auxiliary electrical energy consumption for gas or oil-fueled furnaces or boilers. For furnaces and boilers equipped with single-stage controls, the average annual auxiliary electrical consumption (EAE) is expressed in kilowatt-hours and defined as:
EAE = BOHSS(y PPE yIGPEIG yBE) ESO
Where:
BOHSS = as defined in 10.2.1 of this appendix
PE = as defined in 10.2.1 of this appendix
yP = as defined in 10.2.1 of this appendix
yIG = as defined in 10.2.1 of this appendix
PEIG = as defined in 10.2.1 of this appendix
y = as defined in 10.2.1 of this appendix
BE = as defined in 10.2.1 of this appendix
ESO = as defined in 10.9 of this appendix.
10.2.3.1For furnaces or boilers equipped with two-stage controls, EAE is defined as:
EAE = BOHR (yPPER yIGPEIG yBER) BOHH (yPPEH yIGPEIG y BEH) ESO
Where:
BOHR = as defined in 10.2.1.2 of this appendix
yP = as defined in 10.2.1 of this appendix
PER = as defined in 9.1.2.2 and measured at the reduced fuel input rate of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3)
yIG = as defined in 10.2.1 of this appendix
PEIG = as defined in 10.2.1 of this appendix
y = as defined in 10.2.1 of this appendix
BER = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3) measured at the reduced fuel input rate
BOHH = as defined in 10.2.1.3 of this appendix
PEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3) measured at the maximum fuel input rate
BEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3) measured at the maximum fuel input rate
ESO = as defined in 10.9 of this appendix.
10.2.3.2For furnaces or boilers equipped with step-modulating controls, EAE is defined as:
EAE = BOHR (yP PER yIGPEIG yBER) BOHM (yPPEH yIGPEIG y BEH) ESO
Where:
BOHR = as defined in 10.2.1.2 of this appendix
yP = as defined in 10.2.1 of this appendix
PER = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3), measured at the reduced fuel input rate
yIG = as defined in 10.2.1 of this appendix
PEIG = as defined in 10.2.1 of this appendix
y = as defined in 10.2.1. of this appendix
BER = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3) measured at the reduced fuel input rate
BOHM = as defined in 10.2.1.4 of this appendix
PEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3) measured at the maximum fuel input rate
BEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103—1993, (incorporated by reference, see§ 430.3) measured at the maximum fuel input rate
ESO = as defined in 10.9 of this appendix.
10.3Average annual electric energy consumption for electric furnaces or boilers.
EE = 100(2,080)(0.77)DHR/(3.412 AFUE) ESO
Where:
100 = to express a percent as a decimal
2,080 = as specified in 10.2.1 of this appendix
0.77 = as specified in 10.2.1 of this appendix
DHR = as defined in 10.2.1 of this appendix
3.412 = conversion to express energy in terms of watt-hours instead of Btu
AFUE = as defined in 11.1 of ANSI/ASHRAE Standard 103—1993 (incorporated by reference, see§ 430.3), in percent, and calculated on the basis of: ICS installation, for non-weatherized warm air furnaces; indoor installation, for non-weatherized boilers; or outdoor installation, for furnaces and boilers that are weatherized.
ESO = as defined in 10.9 of this appendix.
10.4Energy factor.
10.4.1Energy factor for gas or oil furnaces and boilers. Calculate the energy factor, EF, for gas or oil furnaces and boilers defined as, in percent:
where:
EF=average annual fuel consumption as defined in 10.2.2 of this appendix.
EAE=as defined in 10.2.3 of this appendix.
EffyHS=Annual Fuel Utilization Efficiency as defined in 11.2.11, 11.3.11, 11.4.11 or 11.5.11 of ANSI/ASHRAE Standard 103-1993, in percent, and calculated on the basis of:
ICS installation, for non-weatherized warm air furnaces;
indoor installation, for non-weatherized boilers; or
outdoor installation, for furnaces and boilers that are weatherized.
3,412=conversion factor from kilowatt to Btu/h
10.4.2Energy factor for electric furnaces and boilers. The energy factor, EF, for electric furnaces and boilers is defined as:
EF=AFUE
where:
AFUE=Annual Fuel Utilization Efficiency as defined in section 10.3 of this appendix, in percent
10.5Average annual energy consumption for furnaces and boilers located in a different geographic region of the United States and in buildings with different design heating requirements.
10.5.1Average annual fuel energy consumption for gas or oil-fueled furnaces and boilers located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled furnaces and boilers 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 10.2.2 of this appendix
8,760=as specified in 10.2.1 of this appendix
QP=as defined in 11.2.11 of ANSI/ASHRAE Standard 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 10.2.1 of this appendix
10.5.2Average annual auxiliary electrical energy consumption for gas or oil-fueled furnaces and boilers located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled furnaces and boilers, 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 10.2.3 of this appendix
ESO = as defined in 10.9 of this appendix
HLH = as defined in 10.5.1 of this appendix
2,080 = as specified in 10.2.1 of this appendix
ESOR = as specified in 10.5.3 of this appendix.
10.5.3Average annual electric energy consumption for electric furnaces and boilers located in a different geographic region of the United States and in buildings with different design heating requirements. For electric furnaces and boilers, 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 specified in 10.3 of this appendix
0.77 = as specified in 10.2.1 of this appendix
DHR = as defined in 10.2.1 of this appendix
HLH = as defined in 10.5.1 of this appendix
3.412 = as specified in 10.3 of this appendix
AFUE = as defined in 10.3 of this appendix
ESOR = ESO as defined in 10.9 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.
10.6Annual energy consumption for mobile home furnaces
10.6.1National average number of burner operating hours for mobile home furnaces (BOH SS ). BOHSS is the same as in 10.2.1 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.
10.6.2Average annual fuel energy for mobile home furnaces (E F ). EF is same as in 10.2.2 of this appendix except that the burner operating hours, BOHSS, is calculated as specified in 10.6.1 of this appendix.
10.6.3Average annual auxiliary electrical energy consumption for mobile home furnaces (E AE ). EAE is the same as in 10.2.3 of this appendix, except that the burner operating hours, BOHSS, is calculated as specified in 10.6.1 of this appendix.
10.7Calculation of sales weighted average annual energy consumption for mobile home furnaces. In order to reflect the distribution of mobile homes to geographical regions with average HLHMHF value different from 2,080, adjust the annual fossil fuel and auxiliary electrical energy consumption values for mobile home furnaces using the following adjustment calculations.
10.7.1For 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 10.6.2 of this appendix
8,760=as specified in 10.2.1 of this appendix
QP=as defined in 11.2.11 of ANSI/ASHRAE Standard 103-1993
HLHMHF=1880, sales weighted average heating load hours for mobile home furnaces
2,080=as specified in 10.2.1 of this appendix
10.7.2For mobile home furnaces the sales weighted average annual auxiliary electrical energy consumption is expressed in kilowatt-hours and defined as:
EAE,MHF=EAEHLHMHF/2,080
where:
EAE=as defined in 10.6.3 of this appendix
HLHMHF=as defined in 10.7.1 of this appendix
2,080=as specified in 10.2.1 of this appendix
10.8Direct determination of off-cycle losses for furnaces and boilers equipped with thermal stack dampers. [Reserved.]
10.9Average 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)) (PW,OFF * 4600)) * K
Where:
PW,SB = furnace or boiler standby mode power, in watts, as measured in Section 8.6
4,160 = average heating season hours per year
PW,OFF = furnace or boiler off mode power, in watts, as measured in Section 8.6
4,600 = average non-heating season hours per year
K = 0.001 kWh/Wh, conversion factor for watt-hours to kilowatt-hours
BOH = total burner operating hours as calculated in section 10.2 for gas or oil-fueled furnaces or boilers. Where for gas or oil-fueled furnaces and boilers equipped with single-stage controls, BOH = BOHSS; for gas or oil-fueled furnaces and boilers equipped with two-stage controls, BOH = (BOHR BOHH); and for gas or oil-fueled furnaces and boilers equipped with step-modulating controls, BOH = (BOHR BOHM). For electric furnaces and boilers, BOH = 100(2080)(0.77)DHR/(Ein 3.412)(AFUE))
Where:
100 = to express a percent as a decimal
2,080 = as specified in 10.2.1 of this appendix
0.77 = as specified in 10.2.1 of this appendix
DHR = as defined in 10.2.1 of this appendix
3.412 = conversion to express energy in terms of KBtu instead of kilowatt-hours
AFUE = as defined in 11.1 of ANSI/ASHRAE Standard 103—1993 (incorporated by reference, see§ 430.3) in percent
E in = Steady-state electric rated power, in kilowatts, from section 9.3 of ANSI/ASHRAE Standard 103—1993 (incorporated by reference, see§ 430.3).
[62 FR 26157, May 12, 1997, as amended at 62 FR 53510, Oct. 14, 1997; 75 FR 64631, Oct. 20, 2010; 76 FR 37546, June 27, 2011]
Effective Date Note:
At 77 FR 76839, Dec. 31, 2012, appendix N was amended as follows, effective Jan. 30, 2013.
a. By revising the second sentence of the introductory note.
b. In section 2.4., by removing the phrase “(First Edition 2005-06)” and adding in its place “(Edition 2.0 2011-01)”;
c. In section 8.6.1, by removing in the third sentence, the phrase “4.5 Power measurement accuracy” and adding in its place, the phrase “4.4 Power measurement instruments” and by adding a sentence at the end of the section.
d. In section 8.6.2, by removing in the third sentence, the phrase “4.5 Power measurement accuracy” and adding in its place the phrase “4.4 Power measurement instruments”, and by adding a sentence at the end of the section. For the convenience of the user, the added and revised text is set forth as follows:
Appendix N to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Furnaces and Boilers
Note:
* * * However, any representation related to standby mode and off mode energy consumption of these products made after July 1, 2013 must be based upon results generated under this test procedure, consistent with the requirements of 42 U.S.C. 6293(c)(2). * * *
8.6.1Standby power measurement. * * * 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.
8.6.2.Off mode power measurement. * * * The recorded off mode power (PW,OFF) 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.

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  • 2014-07-29; vol. 79 # 145 - Tuesday, July 29, 2014
    1. 79 FR 43927 - Energy Conservation Program for Consumer Products: Energy Conservation Standards for Residential Furnaces; Energy Conservation Standards for Residential Direct Heating Equipment
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      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Final rule; technical amendment.
      Effective Date: July 29, 2014.
      10 CFR Part 430

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Title 10 published on 2014-01-01

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  • 2014-08-05; vol. 79 # 150 - Tuesday, August 5, 2014
    1. 79 FR 45377 - Energy Conservation Program for Consumer Products: Energy Conservation Standards for Computer and Battery Backup Systems
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      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Extension of public comment period.
      The comment period for the framework document for computer systems published on July 17, 2014 (79 FR 41656) is extended to October 2, 2014.
      10 CFR Part 430