Tdel is the average delivery temperature for the first draw, "F

Ťa is the average inlet temperature for the first draw, F

and Q is the total energy used by the water

heater between cutout prior to the first draw and cutout following the first draw, including auxiliary energy such as pilot lights, pumps, fans, etc., Btu

6.2.2.2. Variable Input Instantaneous Water Heaters

For instantaneous water heaters which have a variable firing rate, two recovery efflciency values are computed, one at the maximum input rate and one at the minimum input rate. The recovery efficiency used in subsequent computations is taken as the average of these two values. The maximum recovery efficiency is computed as

nr,min

=

M4Cp4(Tdel,4-Tin,4)
Qr,min

where M. is the mass withdrawn during the fourth draw, lbm

Cp is the specific heat of water, Btu/lbm °F TL is the average delivery temperature for the fourth draw, °F

Tina is the average inlet temperature for the first draw, F

and Qrmin is the total energy consumed im

mediately prior to the fourth draw and cutout following the fourth draw, including auxiliary energy such as pilot lights, Btu

The recovery efficiency is computed as

Qd=Q

where Q is the energy used by the flow actuated water heater during the 24 hour simulated use test

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 77 °F (135 °F-58 °F). The following equations adjust the experimental data to a nominal 77 °F temperature rise.

The energy used to heat water may be computed as

6M;Cpi (Tdel,i-Tin,i)

QHW =Σ

i=1

The energy required to heat the same quantity of water over a 77 °F temperature rise is

– QHW.77 = Σ MjCpi (135°F – 58°F)

¿M;Cpi

i=1

where Qam is the daily water heating energy consumption as computed in accordance with section 6.2.3., Btu

M, is the mass associated with the ith draw, 1bm

Cpi is the specific heat of water computed at a temperature of (58 °F+135 °F)/2, Btu/lbm °F

Tdeli is the average delivery temperature for the ith draw, °F

and Tini is the average inlet temperature for the ith draw, °F

6.2.5. Annual Energy Consumption. The annual energy consumption for instantaneous type water heaters is computed as

Eannual-Qdm 365

where Qam is the modified daily energy consumption, Btu per day

and 365 is the number of days within a year, days.

7. Ratings for Untested Models

In order to relieve the test burden to manufacturers who offer water heaters which differ only in fuel type or power input, ratings for untested models may be established in accordance with the following procedures. In lieu of the following procedures a manufacturer may elect to test the unit for which a rating is sought.

7.1. Gas Water Heaters. Ratings obtained for gas water heaters using natural gas can be used for an identical water heater which utilizes propane gas if the input ratings are within 10 percent.

7.2. Electric Water Heaters

7.2.1. First Hour Rating. If an electric storage type water heater is available with more than one input rating, the manufacturer shall designate the standard input rating and the water heater need only be tested with heating elements at the designated standard input ratings. The first hour ratings for units having power input rating less than the designated standard input rating shall be assigned a first hour rating equivalent to the first draw of the first hour rating for the electric water heater with the standard input rating. For units having power inputs greater than the designated standard input rating, the first hour rating shall be equivalent to that measured for the water heater with the standard input rating.

7.2.2. Energy Factor. The energy factor for identical electric storage type water heaters, with the exception of heating element wattage, may use the energy factor obtained during testing of the water heater with the designated standard input rating.

[55 FR 42169, Oct. 17, 1990]

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 nat ural 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 withint 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.

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

1.3 "Operating time” (to) means the hours per year during which the television set is operating with power control turned on.

1.4 "Remote control" means an optional feature which allows the user to control the television set from more than one location by a hand held device.

1.5 "Standby power consumption" (P.) means the minimum amount of energy consumed with the power control switch turned off.

1.6 "Standby time" (t,) means the hours per year during which the television set is connected to a power outlet with the power control switch turned off.

1.7 "Vacation switch or master on-off switch" means an optional energy saving feature incorporated into the design of a television set that permits the user to disconnect the filament keep-warm circuit(s).

1.8 "Remote control defeat switch" means a switch which permits the user to disconnect all standby power to a television set.

2. TESTING CONDITIONS AND MEASUREMENTS 2.1 Test equipment and test signals. The following equipment and test signals shall be used for testing of television sets.

2.1.1 Regulated power source capable of supplying 120 volts (±1.2 volts) alternating current.

2.1.2 Signal generator capable of producing radio frequency (RF) television test signals, at a convenient very high frequency (VHF) channel, modulated with, National Television System Committee composite video as follows:

2.1.2.1 Standard White Pattern, RF signal modulated to 87 percent with a 100 IRE-unit flat field.

2.1.2.2 Standard Black Pattern, all adjustments as for 2.1.2.1 except modulated with a zero IRE-unit flat field.

2.1.2.3 The test signals in 2.1.2.1 and 2.1.2.2, supplied by a source whose impedance equals the design antenna impedance of the television set under test, shall be adjusted to a level of 70 decibels (dB) ±3dB, referred to a zero dB level of one femtowatt (1×10-15 watt) available power. (For a 300 ohm source, 70 dB referred to one femtowatt corresponds to an open-circuit voltage of 3.5 millivolts. For the calculation of "available power" use American National Standard C.16.13-1961, Method of Testing Monochrome Television Broadcast Receivers.)

2.1.3 Wattmeter capable of measuring the average power consumption of the television set under test. The wattmeter shall be accurate to within 1 percent of the full scale value. All measurements shall be made on the upper half of the scale of the wattmeter. 2.2 Initial set-up of television set. 2.2.1 Remove all batteries from television sets designed for both battery and alternating current operation. Deactivate all present or automatic controls affecting brightness

which are customer options. Adjust all noncustomer controls according to the manufacturer's service procedure.

2.2.2 Apply power to the television set under test from the power source specified in 2.1.1 through the wattmeter specified in 2.1.3. Adjust the volume control to the lowest possible setting.

2.2.3 Connect the output of the signal generator as specified in 2.1.2 to the VHF antenna terminals of the television set. Tune the television set to the channel of the RF signal.

2.3 Measurement of operating power consumption (P.)

2.3.1 Turn on the television set and allow at least five minutes warm-up time. With the synchronization controls adjusted for a stable test pattern, apply the standard white pattern specified in 2.1.2.1 to the television set. Adjust any customer controls other than the volume or synchronization controls for maximum power consumption as indicated by the wattmeter specified in 2.1.3. Illuminate any room illuminance sensor which has not been deactivated, to produce maximum power consumption. Record the white pattern consumption (P) as indicated by the wattmeter in watts.

2.3.2 Change the signal source to the standard black pattern specified in 2.1.2.2. Adjust any customer controls, other than the volume or synchronization controls, for the minimum power consumption as indicated by the wattmeter. Cover any room illuminance sensor which has not been deactivated. Record the black pattern power consumption (Pb) as indicated by the wattmeter in watts.

2.3.3 Compute the operating power consumption (po) as follows:

where

Po=(Pw+Po/2)

Po-operating power consumption in watts
Pu-as determined from 2.3.1
Po-as determined from 2.3.2

2.2 Measurements of standby power consumption (P.)

2.4.1 For television sets without either a vacation switch or a remote control defeat switch, turn the power switch off and after two minutes measure the standby power consumption (P).

2.4.2 For a television set equipped with a remote control defeat switch, a vacation switch or both, turn the power switch, any vacation switch, and any remote er consumptions, (Pmax).The standby power is then calculated from the equation:

where

Ps=[(Pmax-Pmin)/2]+Pmin

P, standby power consumption in watts Pmax-power consumption, in watts, measured with the television set power switch off and the vacation switch and