where

k is as defined in section 4.1.1. AT, is as defined in section 4.3. E, is as calculated in section 4.1.1. P=power input to the burner, determined in accordance with section 3.2.1, expressed in Btu per hour.

4.7.2 Recovery rate for electric water heaters. For an electric water heater, calculate the recovery rate, R, expressed in gallons per hour and defined as:

R = P* x Er x 3,412 Btu/kWh k x AT5

where

k is as defined in section 4.1.1. AT, is as defined in section 4.3.

E, is as calculated in section 4.1.2 for electric water heaters with other than immersed heating elements, or section 4.1.3 for electric water heaters with immersed heating elements.

P*=P, power input to the heating elements, expressed in kilowatts, determined in accordance with section 3.2.1 for electric water heaters with other than immersed heating elements or section 3.2.2 for electric water heaters with immersed heating elements, with the following exception: For electric water heaters with dual immersed heating elements which, in characteristic operation of the water heater, are not energized simultaneously at any time, P* shall be taken as the design power rating of the heating element in closest proximity to the hot water outlet of the water heater, expressed in kilowatts.

4.8 First hour rating.

4.8.1 Method for determining first hour rating. Except as provided in section 4.8.2, first hour rating shall be determined in accordance with section 4.8.3.

4.8.2 Options for determining first hour rating. Until December 1, 1979, first hour rating may be determined in accordance with either section 4.8.3 or section 4.8.4.

4.8.3 First hour rating determined by testing. Calculate the first hour rating, F, expressed in gallons and defined as:

(1 - tc)]

R X (1

or

where

R is as calculated in section 4.7.1 for gas and oil water heaters, or section 4.7.2 for electric water heaters.

W=weight of the water withdrawn from the water heater during the first hour rating water draw test, determined in accordance with section 3.7, expressed in pounds.

d=8.25 pounds per gallon, the nominal density of water.

G=volume of water withdrawn from the

water heater during the first hour rating water draw test, determined in accordance with section 3.7, expressed gallons.

Tm arithmetic mean of the outlet water temperature readings recorded during the first hour rating water draw test, determined in accordance with section 3.7, expressed in °F. T. initial outlet water temperature recorded during the first hour rating water draw test, determined in accordance with section 3.7, expressed in °F.

t, elapsed time of the first hour rating water draw test prior to a thermostat on the water heater acting to operate a heating element or the main burner, determined in accordance with section 3.7, expressed in hours.

4.8.4 First hour rating determined by calculation. Calculate the first hour rating, F, expressed in gallons and defined as:

where

V is as defined in section 4.1.1.

R is as calculated in section 4.7.1 for gas and oil water heaters, or section 4.7.2 for electric water heaters.

0.85 the constant multiplier for calculating the results of the first hour rating water draw test.

0.0028 hour/gallon=the constant multiplier

for calculating the duration of the water draw during the first hour rating water draw test, determined by dividing 0.85, as defined in this section, by the product of the hot water withdrawal rate during the first hour rating water draw test, five gallons per minute, and the conversion factor, 60 minutes per hour.

[42 FR 54117, Oct. 4, 1977, as amended at 43 FR 48987, Oct. 19, 1978. Redesignated and amended at 44 FR 37938, June 29, 1979; 44 FR 52639, Sept. 7, 1979]

APPENDIX F TO SUBPART B OF PART 430-UNIFORM TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF ROOM AIR CONDITIONERS

1. Test method. The test method for testing room air conditioners shall consist of application of the methods and conditions in American National Standard (ANS) Z234.11972, "Room Air Conditioners," sections 4, 5, 6.1, and 6.5, and in American Society of Heating, Refrigerating and Air Conditioning in Engineers (ASHRAE) Standard 16-69,

"Method of Testing for Rating Room Air Conditioners."

2. Test conditions. Establish the test conditions described in sections 4 and 5 of ANS Z234.1-1972 and in accordance with ASHRAE Standard 16-69.

3. Measurements. Measure the quantities delineated in section 5 of ANS Z234.1-1972. 4. Calculations. 4.1 Calculate the cooling capacity (expressed in Btu/hr) as required in section 6.1 of ANS Z234.1-1972 and in accordance with ASHRAE Standard 16-69.

4.2 Determine the electrical power input (expressed in watts) as required by section 6.5 of ANS Z234.1-1972 and in accordance with ASHRAE Standard 16-69.

[42 FR 27898, June 1, 1977. Redesignated and amended at 44 FR 37938, June 29, 1979]

APPENDIX G TO SUBPART B OF PART 430-UNIFORM TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF UNVENTED HOME HEATING EQUIPMENT

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 suppli

er.

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 (P) 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.

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:

Eg=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.

P=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 kilowatthours 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:

Pr as defined in 2.2 of this appendix in Btu/hr

PA as defined in 2.1 of this appendix in Btu/hr