10 CFR Part 430, Subpart B, Appendix P to Subpart B of Part 430 - Uniform Test Method for Measuring the Energy Consumption of Pool Heaters

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View PDF at GPO Pt. 430, Subpt. B, App. P
Appendix P to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Pool Heaters
Link to an amendment published at 77 FR 74572, Dec. 17, 2012.
1. Test method. The test method for testing pool heaters is as specified in American National Standards Institute Standard for Gas-Fired Pool Heaters, Z21.56-1994.
2. Test conditions. Establish the test conditions specified in section 2.9 of ANSI Z21.56-1994.
3. Measurements. Measure the quantities delineated in section 2.9 of ANSI Z21.56-1994. The measurement of energy consumption for oil-fired pool heaters in Btu is to be carried out in appropriate units, e.g., gallons.
4. Calculations
4.1Thermal efficiency. Calculate the thermal efficiency, Et (expressed as a percent), as specified in section 2.9 of ANSI Z21.56-1994. The expression of fuel consumption for oil-fired pool heaters shall be in Btu.
4.2Average annual fossil fuel energy for pool heaters. The average annual fuel energy for pool heater, EF, is defined as:
EF=BOH QIN (POH−BOH)QP
where:
BOH=average number of burner operating hours=104 h
POH=average number of pool operating hours=4464 h
QIN=rated fuel energy input as defined according to 2.9.1 or 2.9.2 of ANSI Z21.56-1994, as appropriate
QP=energy consumption of continuously operating pilot light if employed, in Btu/h.
4.3Average annual auxiliary electrical energy consumption for pool heaters. The average annual auxiliary electrical energy consumption for pool heaters, EAE, is expressed in Btu and defined as:
EAE=BOH PE
where:
PE=2Ec if heater tested according to 2.9.1 of ANSI Z21.56-1994
=3.412 PErated if heater tested according to 2.9.2 of ANSI Z21.56-1994, in Btu/h
Ec=Electrical consumption of the heater (converted to equivalent unit of Btu), including the electrical energy to the recirculating pump if used, during the 30-minute thermal efficiency test, as defined in 2.9.1 of ANSI Z21.56-1994, in Btu per 30 min.
2=Conversion factor to convert unit from per 30 min. to per h.
PErated=nameplate rating of auxiliary electrical equipment of heater, in Watts
BOH=as defined in 4.2 of this appendix
4.4Heating seasonal efficiency.
4.4.1Calculate the seasonal useful output of the pool heater as:
EOUT=BOH [(Et/100)(QIN PE)]
where:
BOH=as defined in 4.2 of this appendix
Et=thermal efficiency as defined in 4.1 of this appendix
QIN=as defined in 4.2 of this appendix
PE=as defined in 4.3 of this appendix
100=conversion factor, from percent to fraction
4.4.2Calculate the seasonal input to the pool heater as:
EIN=BOH (QIN PE) (POH−BOH) QP
where:
BOH=as defined in 4.2 of this appendix
QIN=as defined in 4.2 of this appendix
PE=as defined in 4.3 of this appendix
POH=as defined in 4.2 of this appendix
QP=as defined in 4.2 of this appendix
4.4.3Calculate the pool heater heating seasonal efficiency (in percent).
4.4.3.1For pool heaters employing a continuous pilot light:
EFFYHS=100(EOUT/EIN)
where:
EOUT=as defined in 4.4.1 of this appendix
EIN=as defined in 4.4.2 of this appendix
100=to convert a fraction to percent
4.4.3.2For pool heaters without a continuous pilot light:
EFFYHS=Et
where:
Et=as defined in 4.1 of this appendix.
[62 FR 26165, May 12, 1997]
Pt. 430, Subpt. B, App. P, Nt.
Effective Date Note:
At 77 FR 74572, Dec. 17, 2012, appendix P to subpart B of part 430 was revised, effective Jan. 16, 2013. For the convenience of the user, the revised text is set forth as follows:
Appendix P to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Pool Heaters
Note:
The procedures and calculations that refer to standby mode and off mode energy consumption (i.e.,sections 2.2, 2.3, 3.2, 4.2, 4.3, 5.3 equation (3), and 5.4 of this appendix P) need not be performed to determine compliance with energy conservation standards for pool heaters at this time. However, on or after June 17, 2013, any representations related to standby mode and off mode energy consumption of these products must be based upon results generated under this test procedure, consistent with the requirements of 42 U.S.C. 6293(c)(2). For pool heaters, the statute requires that after July 1, 2010, any adopted energy conservation standard shall incorporate standby mode and off mode energy consumption, and upon the compliance date for such standards, compliance with the applicable provisions of this test procedure will also be required.
1.Definitions.
1.1Active mode means the condition during the pool heating season in which the pool heater is connected to the power source, and the main burner, electric resistance element, or heat pump is activated to heat pool water.
1.2IEC 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)
1.3Off mode means the condition during the pool non-heating season in which the pool heater is connected to the power source, and neither the main burner, electric resistance elements, nor heat pump is activated.
1.4Seasonal off switch means a switch present on the pool heater that effects a difference in off mode energy consumption as compared to standby mode energy consumption.
1.5Standby mode means the condition during the pool heating season in which the pool heater is connected to the power source, and neither the main burner, electric resistance elements, nor heat pump is activated.
2.Test Method.
2.1Active mode. The test method for testing pool heaters in active mode is as specified in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3).
2.2Standby mode. The test method for testing the energy consumption of pool heaters in standby mode is as described in sections 3 through 5 of this appendix.
2.3Off mode.
2.3.1Pool heaters with a seasonal off switch.
For pool heaters with a seasonal off switch, no off-mode test is required.
2.3.2Pool heaters without a seasonal off switch.
For pool heaters without a seasonal off switch, the test method for testing the energy consumption of the pool heater is as described in sections 3 through 5 of this appendix.
3.Test conditions.
3.1Active mode. Establish the test conditions specified in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3).
3.2Standby mode and off mode. Following the conclusion of the 30-minute active mode test described in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3), reduce the thermostat setting to a low enough temperature to put the pool heater into standby mode. Operate the pool heater in standby mode for 60 minutes.
4.Measurements.
4.1Active mode. Measure the quantities delineated in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3). The measurement of energy consumption for oil-fired pool heaters in Btu is to be carried out in appropriate units (e.g., gallons).
4.2Standby mode. Record the average electric power consumption during the standby mode test, PW,SB, in W, in accordance with section 5 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3) and the fossil fuel energy consumption during the standby test, Qp, in Btu. Ambient temperature and voltage specifications of ANSI Z21.56 (incorporated by reference; see § 430.3) shall apply to this standby mode testing. 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.
4.3Off mode.
4.3.1Pool heaters with a seasonal off switch. For pool heaters with a seasonal off switch, the average electric power consumption during the off mode, PW,OFF = 0, and the fossil fuel energy consumed during the off mode, Qoff = 0.
4.3.2Pool heaters without a seasonal off switch. Record the average electric power consumption during the standby/off mode test, PW,OFF (= PW,SB), in W, in accordance with section 5 of IEC 62301 (Second Edition) (incorporated by reference; see § 430.3), and the fossil fuel energy consumption during the off mode test, Qoff (= Qp), in Btu. Ambient temperature and voltage specifications of ANSI Z21.56 (incorporated by reference; see § 430.3) shall apply to this off mode testing. 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.
5.Calculations.
5.1Thermal efficiency. Calculate the thermal efficiency, Et (expressed as a percent), as specified in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3). The expression of fuel consumption for oil-fired pool heaters shall be in Btu.
5.2Average annual fossil fuel energy for pool heaters. The average annual fuel energy for pool heaters, EF, is defined as:
EF = BOH QIN (POH − BOH)QPR (8760 − POH) Qoff,R
Where:
BOH = average number of burner operating hours = 104 h
POH = average number of pool operating hours = 4464 h
QIN = rated fuel energy input as defined according to section 2.10.1 or section 2.10.2 of ANSI Z21.56, as appropriate.
QPR = average energy consumption rate of continuously operating pilot light, if employed, = (QP/1 h)
QP = energy consumption of continuously operating pilot light, if employed, as measured in section 4.2 of this appendix, in Btu
8760 = number of hours in one year
Qoff,R = average off mode fossil fuel energy consumption rate = Qoff/(1 h)
Qoff = off mode energy consumption as defined in section 4.3 of this appendix
5.3Average annual auxiliary electrical energy consumption for pool heaters. The average annual auxiliary electrical energy consumption for pool heaters, EAE, is expressed in Btu and defined as:
(1) EAE = EAE,active EAE,standby,off
(2) EAE,active = BOH * PE
(3) EAE,standby,off = (POH − BOH) PW,SB(Btu/h) (8760 − POH) PW,OFF(Btu/h)
Where:
EAE,active = auxiliary electrical consumption in the active mode
EAE,standby,off = auxiliary electrical consumption in the standby mode and off mode
PE = 2Ec, if heater is tested according to section 2.10.1 of ANSI Z21.56, in Btu/h = 3.412 PErated, if heater is tested according to section 2.10.2 of ANSI Z21.56, in Btu/h
Ec = electrical consumption of the heater (converted to equivalent unit of Btu), including the electrical energy to the recirculating pump if used, during the 30-minute thermal efficiency test, as defined in section 2.10.1 of ANSI Z21.56, in Btu per 30 min.
2 = conversion factor to convert unit from per 30 min. to per h.
PErated = nameplate rating of auxiliary electrical equipment of heater, in Watts
BOH = as defined in 5.2 of this appendix
POH = as defined in 5.2 of this appendix
PW,SB (Btu/h) = electrical energy consumption rate during standby mode expressed in Btu/h = 3.412 PW,SB, Btu/h
PW,SB = as defined in 4.2 of this appendix
PW,OFF (Btu/h) = electrical energy consumption rate during off mode expressed in Btu/h = 3.412 PW,OFF, Btu/h
PW,OFF = as defined in 4.3 of this appendix
5.4 Integrated thermal efficiency.
5.4.1Calculate the seasonal useful output of the pool heater as:
EOUT = BOH[(Et/100)(QIN PE)]
Where:
BOH = as defined in 5.2 of this appendix
Et = thermal efficiency as defined in 5.1 of this appendix
QIN = as defined in 5.2 of this appendix
PE = as defined in 5.3 of this appendix
100 = conversion factor, from percent to fraction
5.4.2Calculate the annual input to the pool heater as:
EIN = EF EAE
Where:
EF = as defined in 5.2 of this appendix
EAE = as defined in 5.3 of this appendix
5.4.3Calculate the pool heater integrated thermal efficiency (TEI) (in percent).
TEI = 100(EOUT/EIN)
Where:
EOUT = as defined in 5.4.1 of this appendix
EIN = as defined in 5.4.2 of this appendix
100 = conversion factor, from fraction to percent

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    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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