APPENDIX M TO SUBPART B-UNIFORM TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF CENTRAL AIR CONDITIONERS

1. DEFINITIONS

1.1 "Annual performance factor" means the total heating and cooling done by a heat pump in a particular region in one year divided by the total electric power used in one year.

1.2 "ARI" means Air-Conditioning and Refrigeration Institute.

1.3 "ARI Standard 210-79" means the test standard published in 1979 by the ARI and titled "Standard for Unitary Air-Conditioning Equipment".

1.4 "ARI Standard 240-77" means the test standard published in 1977 by the ARI and titled "Standard for Air-Source Unitary Heat Pump Equipment".

1.5 "ARI Standard 320-76" means the test standard published in 1976 by the ARI and titled "Standard for Water-Source Heat Pumps".

1.6 "ASHRAE" means the American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc.

1.7 "ASHRAE Standard 37-78" means the test standard published by ASHRAE in 1978 and titled "Methods of Testing for Rating Unitary Air-Conditioning and Heat Pump Equipment."

means a

1.8 "Continuously recorded" method of recording measurements in intervals no greater than 5 seconds.

1.9 "Cooling load factor (CLF)" means the ratio of the total cooling done in a complete cycle of a specified time period, consisting of an "on" time and "off" time, to the steady-state cooling done over the same period at constant ambient conditions.

1.10 "Cyclic Test" means a test where the indoor and outdoor conditions are held constant, but the unit is manually turned "on" and "off" for specific time periods to simulate part-load operation.

1.11 "Degradation coefficient (CD)" means the measure of the efficiency loss due to the cycling of the unit.

1.12 "Demand-defrost control system" means a system which is designed to perform the defrost function on the outdoor coil of the heat pump only when a predetermined degradation of performance is measured.

1.13 "Design heating requirement (DHR)" is the amount of heating required to maintain a given indoor temperature at a particular outdoor design temperature.

1.14 "Dry-coil test" means a test conducted at a wet-bulb temperature and a dry-bulb temperature such that moisture will not condense on the evaporator coil of the unit.

1.15 "Heating seasonal performance factor (HSPF)" means the total heating output of a heat pump during its normal annual usage period for heating divided by the total electric power input during the same period.

1.16 "Heating load factor (HLF)" means the ratio of the total heating done in a complete cycle of a specified time period, consisting of an "on" time "off" time, to the steady state heating done over the same period at constant ambient conditions.

1.17 "Latent cooling" means the amount of cooling in Btu's necessary to remove water vapor from the air passing over the indoor coil by condensation during a period of time.

1.18 "Part-load factor (PLF)" means the ratio of the cyclic energy efficiency ratio to the steady-state energy efficiency ratio at identical ambient conditions.

1.19 "Seasonal energy efficiency ratio (SEER)" means the total cooling of a central air conditioner in Btu's during its normal annual usage period for cooling divided by the total electric power input in watt-hours during the same period.

1.20 "Sensible cooling" means the amount of cooling in Btu's performed by a unit over a period of time, excluding latent cooling.

1.21 "Single package unit" means any central air conditioner in which all the major assemblies are enclosed in one cabinet.

1.22 "Split system" means any central air conditioner in which one or more of the major assemblies are separate from the others.

1.23 "Steady-state test" means a test in which all indoor and outdoor conditions are held constant and the unit is in non-changing operating mode.

1.24 "Temperature bin" means a 5° F increment over a dry-bulb temperature range of 65° F through 104° F for the cooling cycle and -25° F through 64° F for the heating cycle.

1.25 "Time-temperature defrost control system" means a system which automatically provides the defrost function at a predetermined time interval whenever the outdoor temperature drops below a level where frosting will occur.

1.26 "Test condition tolerance" means the maximum permissible variation of the average of the test observations from the standard or desired test condition as provided in 6.1.1, 6.2.1, 6.2.2, and 6.2.3 of this Appendix.

1.27 "Test operating tolerance" means the maximum permissible difference between the maximum and the minimum instrument observation during a test as provided in 6.1.1, 6.2.1, 6.2.2, and 6.2.3 of this Appendix.

1.28 "Wet-coil test" means a test conducted at a wet-bulb temperature and a drybulb temperature such that moisture will condense on the test unit evaporator coil.

2. TESTING REQUIRED

2.1 Testing required for air source cooling only units. Two steady state wet coil tests required to be performed, test A and test B. Test A is to be conducted as an outdoor dry bulb temperature of 95° F and test B at 82° F. Test C and D are optional tests to be conducted when cyclic performance parameters are to be measured in order to determine the degradation coefficient, CD Test C is a steady state dry coil test conducted at an outdoor dry bulb temperature of 82° F. Test D is a cyclic test also conducted at an outdoor dry bulb temperature of 82° F. In lieu of conducting tests C and D, an assigned value of 0.25 may be used for the degradation coefficient, CD.

2.1.1 Testing required for units with single speed compressors and single speed condenser fans. Test A and test B shall be performed according to the test procedures outlined in 4.1 of this Appendix. In addition, the cyclic performance shall be evaluated by conducting test C and D according to the requirements outlined in 4.1 of this Appendix.

2.1.2 Testing required for units with single speed compressors and multiple-speed condenser fans. The test requirements for multiple-speed condenser fan units shall be the same as described in section 2.1.1 for single speed condensor fan units.

2.1.3 Testing required for units with twospeed compressors, two compressors, or cylinder unloading. The test requirements for two-speed compressor units, two compressor units, or units with cylinder unloading are the same as described in 2.1.1 of this Appendix except that test A and test B shall be performed at each compressor speed or at each compressor capacity.

2.1.4 Testing required for units with twospeed compressors, two compressors, or cylinder unloading capable of varying the sensible to total (S/T) capacity ratio. When a unit employing a two-speed compressor, two compressors, or cylinder unloading provides a method of varying the ratio of the sensible cooling capacity to the total cooling capacity, (S/T), the test requirements are the same as for two-speed compressor units as described in 2.1.3 of this Appendix.

2.1.5 Testing required for units with triple-capacity compressors. (Reserved)

2.1.6 Testing required for units with variable-speed compressors. The tests for variable-speed equipment consist of five (5) wet coil tests and two (2) dry coil tests. Two of the wet coil tests, A and B, are conducted at the maximum speed. Two wet coil tests, B2 and low temperature test, are conducted at the minimum speed. The fifth wet coil test is conducted at an intermediate speed. Dry

coil tests, C and D, are con minimum speed if the coeffi dation (C) value of 0.25 is no test conditions and procedure are outlined in sections 3.1 a Appendix.

2.1.7 Testing required for less systems. The tests for spli systems are determined by th pressor installed in the out the appropriate tests refer to 2.1.2, 2.1.3, 2.1.4, 2.1.5, or 2.1.6 dix.

2.2 Testing required for a ing only units. Four types o quired to be performed: High Cyclic, Frost Accumulation, perature. In lieu of conduct Test an assigned value of 0.2 for the degradation coefficien

2.2.1 Testing required fo single speed compressors. Un speed compressors shall be su tively to the High Temper 47° F described in section 3.2. Test as described in section 3.1 Accumulation Test as descri 3.2.1.3, and the Low Temper described in section 3.2.1.4.

2.2.2 Testing required for u speed compressors, two comp inder unloading. With the u at high compressors speed (t pressor), with both compres ation (two-compressors), or at capacity (cylinder unloading); tests are required to be per units; the High Temperature the Frost Accumulation Test Temperature Test. An additio at 47° F) is required, with the at the high compressor spe compressor), with both compr ation (two compressors), or at capacity (cylinder unloading); mode of operation requires cy "off" of the compressor(s) at maximum capacity.

With the unit operating: at pressor speed (two-speed com the single compressor which r ates at low loads (two comp the low compressor capacity loading); the following tests a be performed on all units: the ature Test at 47° F, the High Test at 62° F, and the Cyclic T al tests, (Frost Accumulation Temperature Test) are requi unit operating: on low com (two-speed compressor), wit compressor which normally of loads (two compressors) or at pressor capacity (cylinder unl unit's low speed, one compres pacity performance at and