needed to calculate its seasonal perform

ance.

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

2.2.4 Testing required for units with variable-speed compressors. There are seven basic tests and one optional test for variable-speed units. Three tests (high temperature test, low temperature test, and frost accumulation test) are performed at the maximum speed. Three tests (two high temperature and one cyclic test) are performed with the unit operating at minimum speed. A second frost accumulation test is performed at an intermediate speed. The intermediate speed is the same as in the cooling mode.

In lieu of the maximum speed frost accumulation test, two equations are provided in section 4.2 of this Appendix. In lieu of the cyclic test an assigned value of 0.25 may be used for the coefficient of degradation CD. The optional test is a nominal capacity test applicable to units which have a heating mode maximum speed greater than the cooling mode maximum speed. The conditions and procedures for the above tests are described in sections 3.2 and 4.2 respectively, of this Appendix.

2.2.5 Testing required for split-type ductless system. The type of compressor installed in the outdoor unit determines the testing required, refer to previous sections 2.2.1, 2.2.2, 2.2.3, or 2.2.4. The conditions and procedures will be modified as indicated for the various types as stated in sections 3.2 and 4.2 respectively.

2.3 Testing required for air source units which provide both heating and cooling. The requirements for units which provide both heating and cooling shall be the same as the requirements in Section 2.1. and 2.2 of this Appendix.

3. TESTING CONDITIONS

3.1 Testing conditions for air source cooling only units. The test room requirement and equipment installation procedures are the same as those specified in sections 11.1 and 11.2 of ASHRAE Standard 37-78. Units designed for both horizontal and vertical installation shall be tested in the orientation in which they are most frequently installed. All tests shall be performed at the normal residential voltage and frequency for which the equipment is designed (either 115 or 230 volts and 60 hertz), the test installation shall be designed such that there will be no air flow through the cooling coil due to natural or forced convection while the indoor fan is "off". This shall be accomplished by installing dampers upstream and downstream of the test unit to block the off period air flow. Values of capacity for rating purposes are to be rounded off to the nearest 100 Btu/hour for capacities less than 20,000 Btu/hour; to the nearest 200 Btu/ hour for capacities between 20,000 and

37,999 Btu/hour; and to the nearest 500 Btu/hour for capacities between 38,000 and 64,999 Btu/hour.

The following conditions listed in ARI Standard 210.79 shall apply to all tests performed in Section 3.1 of this Appendix: 5.1.3.4 Cooling Coil Air Quantity. 5.1.3.6 Requirements for Separated Assemblies.

3.1.1 Testing conditions for units with single speed compressors and single speed condenser fans.

3.1.1.1 Steady state wet-coil performance tests (Test A and Test B). Test A and test B shall be performed with the air entering the indoor side of the unit having a dry-bulb temperature of 80° F and a wet-bulb temperature of 87° F. The dry-bulb temperature of the air entering the outdoor side of the unit shall be 95° F in test A and 82° F in test B. The temperature of the air surrounding the outdoor side of the unit in each test shall be the same as the outdoor entering air temperature except for units or sections thereof intended to be installed only indoors, in which case the dry-bulb temperature surrounding that indoor side of the unit shall be 80° F. For those units which reject condensate to the condenser, located in the outdoor side of the unit, the outdoor wet-bulb temperature surrounding the outdoor side of the unit shall be 75° F in test A and 65° F in test B.

3.1.1.2 Steady state dry coil performance test (Test C) and cyclic dry coil performance test (Test D). Test C and test D shall be performed with the air entering the indoor side of the unit having a dry-bulb temperature of 80° F and a wet-bulb temperature which does not result in formation of condensate on the indoor coil. (It is recommended that an indoor wet-bulb temperature of 57° F or less be used.) The dry-bulb temperature of the air entering the outdoor portion of the unit shall be 82° F. The outdoor portion of the unit shall be subject to the same conditions as the requirements for conducting test B as stated previously in section 3.1.1.1. Test C shall be conducted with the unit operating steadily. Test D shall be conducted by cycling the unit "on" and "off" by manual or automatic operation of the normal control circuit of the unit. The unit shall cycle with the compressor "on" for 6 minutes and "off" for 24 minutes. The indoor fan shall also cycle "on" and "off", the duration of the indoor fan "on" and "off" periods being governed by the automatic controls which the manufacturer normally supplies with the unit. The results of tests C and D shall be used to calculate & degradation coefficient, C1 by the procedures outlined in 5.1 of this Appendix.

3.1.2 Testing conditions for units with single speed compressors and multiple-speed

condenser fans. The condenser fan speed to be used in test A shall be that speed which normally occurs at an outdoor dry-bulb temperature of 95° F, and for test B, the fan speed shall be that which normally occurs at an outdoor dry-bulb temperature of 82° F. If elected to be performed, tests C and D shall be conducted at the same condenser fan speed as in test B.

3.1.3 Testing conditions for units with two-speed compressors, two compressors, or cylinder unloading. The condenser fan speed used in conducting test A at each compressor speed shall be that which normally occurs at an outdoor dry-bulb temperature of 95° F. For test B, the condenser fan speed at each compressor speed shall be that which normally occurs at an outdoor dry-bulb temperature of 82° F. If elected to be performed, tests C and D shall be conducted at the low compressor speed with the same condenser fan speed as used in test B. For those two-speed units in which the normal mode of operation involves cycling the compressor "on" and "off" at high speed, tests C and D shall also be performed with the compressor operating at high speed and at a condenser fan speed that normally occurs at test A ambient conditions. Units consisting of two compressors are subject to the same requirements as those units containing two-speed compressors, except that when operated at high speed, both compressors shall be operating and when operating at low speed, only the compressor which normally operates at an outdoor dry-bulb temperature of 82° F shall be operating.

In lieu of conducting tests C and D, an assigned value of 0.25 may be used for the degradation coefficient, CD, at each compressor speed. If the assigned degradation coefficient is used for one compressor speed it must also be used for the other compressor speed.

In the case of units with cylinder unloading, the loaded and the unloaded conditions correspond to high and low compressor speed on two-speed units respectively.

3.1.4 Testing conditions for units with two-speed compressors, two compressors, or cylinder unloading capable of varying the sensible to total (S/T) capacity ratio. The mode of operation selected for controlling the S/T ratio in the performance of test A and test B at each compressor speed shall be such that it does not result in an operating configuration which is not typical of a normal residential installation. If elected to be performed, tests C and D shall be conducted at low compressor speed (single compressor operating) with the same S/T control mode as used in test B when performed at the low compressor speed. Likewise, tests C and D shall also be conducted at high compressor speed (two compressors operating) and with the same S/T control mode as

in test A when performed at th pressor speed.

In the case of units with cylir ing, the loaded and unloaded co respond to high and low comp on two-speed units respectively.

3.1.5 Testing conditions for triple-capacity compressors. (Re:

3.1.6 Additional testing con cooling-only units with variable pressors. For cooling-only uni source heat pumps with varaible pressors, the air flow rate at far than the maximum fan speed sh mined by using the fan law for sistance system. The air flow r by the ratio of the actual fan s maximum fan speed multiplied flow rate at the maximum fan: mum static pressure require apply when the fan is running a mum speed.

3.1.6.1 Testing conditions for wet coil tests. Tests A and B s formed at the maximum speed a specified in section 3.1.1 of thi Test B2 and the low temperat performed at the minimum spe door dry bulb temperatures of 8: respectively. The intermediate coil test is performed at the bulb temperature of 87°F. For reject condensate the outdoor w perature shall be maintained Test A, 65°F for Tests B and B the low temperature test and intermediate test. The indoor co all wet coil tests are the same as in section 3.1.1 of this Appendix.

3.1.6.2 Test conditions for dr Dry coil Tests C and D are cond outdoor dry bulb temperature units which reject condensate wet bulb temperature shall be at 53.5°F. The indoor dry bulb shall be 80°F and the wet bulb shall be sufficiently low so no c occurs on the evaporator (It is ed that an indoor wet bulb tem 57°F or less be used).

At least 10 feet of the interconnection tubing shall be exposed to the outside conditions. The line sizes, insulation and details of installation shall be in accordance with the manufacturer's published recommendation.

3.1.7.2 Control testing conditions for split-type ductless systems. For split-type ductless systems, a single control circuit shall be substituted for any multiple thermostats in order to maintain a uniform cycling rate during test D and the high temperature heating cyclic test. During the steady-state tests, all thermostats shall be shunted resulting in all indoor fan-coil units being in operation.

3.1.7.3 Split-type ductless systems with multiple coils or multiple discharge outlets shall have short plenums attached to each outlet. Each plenum shall discharge into a single common duct section, the duct section in turn discharging into the air measuring device (or a suitable dampering device when direct air measurement is not employed). Each plenum shall have an adjustable restrictor located in the plane where the plenums enter the common duct section for the purpose of equalizing the static pressures in each plenum. The length of the plenum is a minimum of 2.5×(AXB)", A width and B-height of duct or outlet. Static pressure readings are taken at a distance of 2x(AxB) from the outlet.

3.2 Testing conditions for air source heating only units. The equipment under test shall be installed according to the requirements of Section 11.2 of ASHRAE Standard 37-78 and Section 5.1.4.5 of ARI Standard 240-77. Test chamber requirements are the same as given in Section 11.1 of ASHRAE Standard 37-78. Units designed for both horizontal and vertical installation shall be tested in the orientation in which they are most often installed. All tests shall be performed at the normal residential voltage and frequency for which the equipment

designed (either 115 or 230 volts and 60 hertz). Values of capacity for rating purposes are to be rounded off to the nearest 100 Btu/hour for capacities less than 20,000 Btu/hour; to the nearest 200 Btu/hour for capacities between 20,000 and 37,999 Btu/ hour; and to the nearest 500 Btu/hour for capacities between 38,000 and 64,999 Btu/ hour.

3.2.1 Testing conditions for units with single speed compressors.

3.2.1.1 High temperature test conditions. The High Temperature Test at 47° F shall be conducted at an outdoor dry-bulb temperature of 47° F and an outdoor wet-bulb temperature at 43° F. The High Temperature Test at 62° F shall be conducted at an outdoor dry-bulb temperature of 62° F and an outdoor wet-bulb temperature of 56.5° F. For both tests, the dry-bulb air temperature entering and surrounding the indoor por

tion of the unit shall be 70° F and a maximum wet-bulb temperature of 60° F. The duration of the tests shall be for a minimum of 1⁄2 hour.

3.2.1.2 Cycling test conditions. The Cycling Test at 47° F shall be conducted at the same dry-bulb and wet-bulb temperature as the High Temperature Test at 47° F as described in 3.2.1.1. During the Cycling Test, the indoor fan shall cycle "on" and "off", as the compressor cycles "on" and "off", except that the indoor fan cycling times may be delayed due to controls that are normally installed with the unit. The compressor cycling times shall be 6 minutes "On" and 24 minutes "off." The test installation shall be designed such that there will be no airflow through the indoor unit due to natural or forced convection while the indoor fan is "off." This shall be accomplished by installing dampers upstream and downstream of the test unit to block the off period airflow.

3.2.1.3 Frost accumulation test conditions. The dry-bulb temperature and the resultant dew-point temperature of the air entering the outdoor portion of the unit shall be 35° F and 30° F respectively. The indoor dry-bulb temperature shall be 70° F and the maximum indoor wet-bulb temperature

shall be 60° F. The Frost Accumulation Test requires that the unit undergo a defrost prior to the actual test. The test then begins at defrost termination and ends at the next defrost termination. Defrost termination occurs when the controls normally installed within the unit are actuated to cause it to change defrost operation to normal heating operation. During the test, auxiliary resistance heaters shall not be employed during either the heating or defrost portion of the test.

3.2.1.4 Low temperature test conditions. The Low Temperature Test shall be conducted at a dry-bulb temperature entering the outdoor portion of the unit of 17° F and a wet-bulb temperature of 15° F. The air entering the indoor portion of the unit shall have a dry-bulb temperature of 70° F and a maximum wet-bulb temperature of 60° F.

3.2.1.5 Additional testing conditions. All tests shall be conducted at the indoor-side air quantities specified in Sections 4.1.4.3 and 5.1.4.6 and Table 2 of ARI Standard 240-77. The following conditions listed in ARI Standard 240-77 shall apply to all tests performed in Section 3.2 of this Appendix. 3.2.3 Testing conditions for units with triple-capacity compressors. (Reserved)

3.2.4 Testing conditions for units with variable-speed compressors. The testing condition for variable-speed compressors shall be the same as those for single speed units as described in section 3.2.1 of this Appendix with the following exceptions; the cyclic test is performed with an outdoor dry bulb

temperature of 62°F and a wet bulb temperature of 56.5°F. The optional, nominal capacity test shall be performed at the conditions specified for the 47°F high temperature test.

3.2.5 Testing conditions for split-type ductless system. The testing conditions for split-type ductless systems shall be based on the type of compressor installed in the single outdoor unit. The heating mode shall have the same piping and control requirements as in 3.1.7.

5.4.4.4 Outdoor-Side Air Quantity; and 5.1.4.5 Requirements for Separated Assemblies.

In all tests, the specified dry-bulb temperature entering the outdoor portion of the unit also applies to the air temperature surrounding the outdoor portion of the unit. Similarly, models where portions are intended to be installed indoors shall have the air temperature surrounding that portion of the unit the same as the indoor air temperature.

3.2.2 Testing conditions for units with two-speed compressors, two compressors or cylinder unloading. The testing conditions for two-speed compressors, two compressors, or cylinder unloading shall be the same as those for single speed units as described in 3.2.1.

3.3 Testing conditions for air source units which provide both heating and cooling. The testing conditions for units which provide both heating and cooling shall be the same as the requirements in Sections 3.1 and 3.2 of this Appendix.

4.0 Testing procedures. Measure all electrical inputs as described in the procedures below. All electrical measurements during all "on" and "off" periods shall include auxiliary power or energy (controls, transformers, crankcase heaters, etc.) delivered to the unit.

4.1 Test procedures for air source cooling-only units. All steady-state wet- and drycoil performance tests on single package units shall simultaneously employ the AirEnthalpy Method (Section 3 of ASHRAE Standard 37-78) on the indoor side and one other method consisting of either the AirEnthalpy Method or the Compressor Calibration Method (Section 4 of ASHRAE Standard 37-78 on the outdoor side. All steady-state wet and dry-coil performance tests on split systems shall simultaneously employ the Air-Enthalpy Method or the Compressor Calibration Method on the indoor side and the Air-Enthalpy Method, the Compressor Calibration Method or the Volatile Refrigerant Flow Method (Section 5 of ASHRAE Standard 37-78) on the outside. All cyclic dry-coil performance tests shall employ the Air-Enthalpy Method, indoor side only. The values calculated from the two test methods must agree within 6 percent in order to constitute a valid test.

Only the results from the Air-Enthalpy Method on the indoor side shall be used in the calculations in Section 5.1. Units shall be installed and tested in such a manner that when operated under steady-state conditions, the cooling coil and condenser coil air flows meet the requirements of Sections 5.1.3.4, 5.1.3.5, and 5.1.3.7 of ARI Standard 210.79.

4.1.1 Test operating procedures.

4.1.1.1 Steady-state wet-coil performance tests (Test A and Test B). Steady-state wetcoil performance tests (A and B) shall be conducted in accordance with the conditions described in sections 3.1.1.1, 3.1.2, 3.1.3, 3.1.4, and 3.1.5 of this Appendix and the procedures described for cooling tests in Section 11.3 of ASHRAE standard 37-78 and evaluated in accordance with the cooling-related requirements of Section 12 of the ASHRAE Standard 37-78. The test room reconditioning apparatus and the equipment under test shall be operated until equilibrium conditions are attained.

4.1.1.2 Steady-state and cyclic dry-coil performance tests (Test C and Test D). The steady-state and cyclic dry-coil tests (C and D) shall be conducted as described below in accordance with the conditions described in sections 3.1.1.2, 3.1.2, 3.1.3, 3.1.4, and 3.1.5 of this Appendix. The results shall be evaluated in accordance with the cooling related requirements of Sections 12.1.5, 12.1.6, 12.1.7, of ASHRAE Standard 37.78. The test room reconditioning apparatus and the equipment under test shall be operated until equilibrium conditions are attained, but not for less than one hour before data for test C are recorded. For all equipment test methods including the Compressor Calibration Method, test C shall be performed with data recorded at 10-minute intervals until four consecutive sets of readings are attained with the tolerance prescribed in Section 11.6 of ASHRAE Standard 37-78. When the AirEnthalpy Method is used on the outdoor side for test C, the requirements of this section shall apply to both the preliminary test and the regular equipment test; the requirements of Section 3.6 of ASHRAE Standard 37-78 shall also apply. Immediately after test C is completed the test unit shall be manually cycled "off" and "on" using the time periods from 3.1.1 of this Appendix until steadily repeating ambient conditions are again achieved in both the indoor and outdoor test chambers, but for not less than 2 complete "off"/"on" cycles. Without a break in the cycling pattern, the unit shall be run through an additional "off"/"on" cycle during which the test data required in 5.1 shall be recorded. During this last cycle, which is referred to as the test cycle, the indoor and outdoor test room ambient conditions shall remain within the tolerances specified in 4.1.3 of this Appendix during

the cyclic dry-coil tests, all air moving equipment on the condenser side shall cycle "on" and "off" when the compressor cycles "on" and "off". The indoor air moving equipment shall also cycle "off" as governed by any automatic controls normally installed with the unit. This last requirement applies to units having an indoor fan time delay. Units not supplied with an indoor fan time delay shall have the indoor air moving equipment cycle "on" and "off" as the compressor cycles "on" and "off."

Cooling cyclic tests for variable-speed units shall be conducted by cycling the compressor 12 minutes "on" and 48 minutes "off". The capacity shall be measured for the integration time (0), which is the compressor "on" time of 12 minutes or the "on" time as extended by fan delay, if so equipped. The electrical energy shall be measured for the total integration time (0cc) of 60 minutes. In lieu of conducting C and D tests, an assigned value of 0.25 shall be used for the degradation coefficient for cooling, CD.

4.1.1.3 Testing procedures for triple-capacity compressors. (Reserved)

4.1.1.4 Intermediate cooling steady-state test for units with variable-speed compressors. For units with variable-speed compressors, an intermediate cooling steady-state test shall be conducted in which the unit shall be operated at a constant, intermediate compressor speed (k=i) in which the dry/bulb and wet-bulb temperatures of the air entering the indoor coil are 80°FDB and 67°FWB and the outdoor coil are 87 DB and 69°FWB. The tolerances for the dry-bulb and wet-bulb temperatures of the air entering the indoor and outdoor coils shall be the test operating tolerance and test condition tolerance specified in Table 6.1.1 of this Appendix. The intermediate compressor speed shall be the minimum compressor speed plus one-third the difference between the maximum and minimum speeds of the cooling mode. (Inter. speed=min. speed + 3 (max. speed-min. speed.) A tolerance of plus five percent or the next higher inverter frequency step from that calculated is allowed.

4.1.1.5 Testing procedures for split-type ductless systems. Cyclic tests of ductless units will be conducted without dampers. The data cycle shall be preceded by a minimum of two cycles in which the indoor fan cycles on and off with the compressor. For the data cycle the indoor fan will operate three minutes prior to compressor cut-on and remain on for three minutes after compressor cut-off. The integration time for capacity and power shall be from compressor cut-on time to indoor fan cut-off time. The fan power for three minutes after compressor cut-off shall be added to the integrated cooling capacity.

4.1.2 Test instrumentation. The steadystate and cyclic performance tests shall have the same requirements pertaining to instrumentation and data as those specified in Section 10 and Table II of ASHRAE Standard 37.78. For the cyclic dry-coil performance tests, the dry-bulb temperature of the air entering and leaving the cooling coil, or the difference between these two drybulb temperatures, shall be continuously reIcorded with instrumentation accurate to within ±0.3° F of indicated value and have a response time of 2.5 seconds or less. Response time in the time required for the instrumentation to obtain 63 percent of the final steady-state temperature difference when subjected to a step change in temperature difference of 15° F or more. Electrical measurement devices (watt-hour meters) used during all tests shall be accurate to within ±0.5 percent of indicated value.

4.1.3 Test tolerances. All steady-state wetand dry-coil performance tests shall be performed within the applicable operating and test condition tolerances specified in Section 11.6 and Table III of ASHRAE Standard 3778.

4.1.3.1 The indoor and outdoor average dry-bulb temperature for the cyclic dry coil test D shall both be within 1.0° F of the indoor and outdoor average dry bulb temperature for the steady-state dry coil test C, respectively.

4.1.3.2 The test condition and test operating tolerances for conducting test D are stated in 6.1.1 of this Appendix. Variation in the test conditions greater than the tolerances prescribed in 6.1.1 of this Appendix shall invalidate the test. It is suggested that an electric resistance heater having a heating capacity approximately equal to the sum of the cooling capacity and compressor and condenser fan power should be installed in the outdoor test room and cycled "off" and "on" as the unit cycles "on" and "off" respectively to improve control in the outdoor test room. Similarly, an electric resistance heater having a heating capacity approximately equal to the cooling capacity of the unit could be installed in the indoor test room, and cycled "on" and "off" as the test unit cycles "on" and "off" to improve indoor room control.

4.2 Testing procedures for air source heating only units.

4.2.1 Test operating procedures. All High Temperature Tests, the Cyclic Test, the Frost Accumulation Test, and the low Temperature test shall have the performance evaluated by the Air-Enthalpy Method on the indoor side. In addition, the High Temperature Test and the Low Temperature Test shall have a simultaneous test method (as described in 4.1) used as a check. The values calculated from the two methods must agree within 6 percent in order to con