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25HCR
COMFORTt SERIES R---22HEAT PUMPS
SIZES18TO60
1---1/2TO5NOMINALTONS
Installation Instructions
TABLEOFCONTENTS
PAGE
SAFETYCONSIDERATIONS ....................... 2
INSTALLATIONRECOMMENDATIONS ............. 2
INSTALLATION ..............................3--10
Step 1 -- Check Equipment& Jobsite ............... 3
Step 2 -- Install on Solid Pad...................... 3
Step 3 -- Clearance Requirements .................. 3
Step 4 -- Operating Ambient ...................... 3
Step 5 -- Install TXV ...
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SAFETYCONSIDERATIONS INSTALLATIONRECOMMENDATIONS Improper installation, adjustment, alteration, service, NOTE: In some cases noise in the living area hasbeen traced to maintenance, or use can causeexplosion, fire,electrical shock,or gaspulsationsfrom improperinstallation ofequipment. other conditions which may cause death, personal injury, or 1. Locate unit away from windows, patios, decks, etc.where property damage. Consult a qualified installer, service agency, or unitoperation sound may distu
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INSTALLATION On rooftop applications, locate unit at least 6 in. above roof surface. STEP1 —CheckEquipmentandJobSite STEP4 —OperatingAmbient UnpackUnit The minimum outdoor operating ambient in cooling mode is Moveto finallocation.Remove carton taking carenot to damage 55°F, and the maximum outdoor operating ambient in cooling unit. mode is 125°F. The maximum outdoor operating ambient in InspectEquipment heating modeis66°F. Fileclaimwith shipping company prior to installation ifshipment STEP5 —In
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STEP6 —CheckDefrostThermostat 10 O'CLOCK 2 O'CLOCK Check defrost thermostat to ensure it is properly located and securely attached. There is a liquid header with a brass distributor SENSING BULB and feeder tube going into outdoor coil. At the end of the one of thefeedertubes,thereisa3/8 in.O.D. stub tube approximately 2 STRAP in.long.(SeeFig.5.)Thedefrostthermostatshouldbelocatedon stub tube. Note that there is only one stub tube used with liquid header, and on most units it is the bottom cir
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Outdoor units may be connected to indoor section using Remove plastic retainer holding outdoor piston in liquid service accessory tubing package or field--supplied refrigerant grade valve, leaving the piston and piston retainer inside the valve. tubing of correct size and condition. For tubing requirements Connect sweat/flare adapter provided, to valve. (See Fig. 6.) beyond 80 ft., substantial capacity and performance losses can Connect refrigerant tubing to fittings on outdoor unit vapor and oc
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IMPORTANT: Check to be certain factory tubing on both STEP8 —MakeElectricalConnections indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay ! WARNING close attention to feeder tubes, makings sure wire ties on feeder tubesaresecureand tight. ELECTRICALSHOCKHAZARD Be sure field wiring complies with local and national fire, safety, Failure to follow this warning could result in personal and electrical codes, and voltage to
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ConnectControlWiring STEP11 —Start--Up Route 24v control wires through control wiring grommet and connect leads to control wiring. See Thermostat Installation ! CAUTION Instructionsforwiring specificunitcombinations.(SeeFig.9.) Use No. 18 AWG color--coded, insulated (35°C minimum) wire. PERSONALINJURYHAZARD If thermostat is located more than 100 ft. from unit, as measured Failure to follow this caution may result in personal along the control voltage wires, use No. 16 AWG color--coded injury. wi
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OF1 OF2 ON 120 30 60 QUIET SHIFT 60 30 90 INTERVAL TIMER OFF P3 DFT T1 Y T2 C C O P1 DFT J1 O R W Y C SPEEDUP 2 TYPICAL HEAT HP THERMOSTAT FAN COIL PUMP R R R 24 VAC HOT C 24 VAC COM C C * W2 HEAT STAGE 2 W2 W2 * E COOL/HEAT Y STAGE 1 Y * W3 INDOOR FAN G G RVS COOLING O O EMERGENCY E IF AVAILABLE * HEAT LEGEND 24-V FACTORY WIRING 24-V FIELD WIRING FIELD SPLICE CONNECTION ODT OUTDOOR THERMOSTAT EHR EMERGENCY HEAT RELAY SHR SUPPLEMENTAL HEAT RELAY A02325/A97413 Fig.9 --- Gen
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SequenceofOperation QuietShift Quiet shift is a field selectable defrost mode (factory set to OFF), NOTE: Defrostcontrolboard isequipped with5 minutelockout which will eliminate occasional noise that could be heard at the timer that is initiated upon any interruption ofpower. start of defrost cycle and restarting of heating cycle. It is selected Turn on power to indoor and outdoor units. Transformer is by placing DIP switch 3 on defrostboard (seeFig. 12)in theON energized. position. Cooling When
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STEP12 —CheckCharge Table3—RequiredLiquid--LineTemperature Factory charge and charging method are shown on unit rating Liquid plate. To check charge in cooling mode, refer to Cooling Only Pressure RequiredSubcoolingTemperature( °F) Procedure. To check charge in heating mode, refer to Heating atService Check Chart Procedure. Valve CoolingOnlyProcedure (PSIG) 5 10 15 20 134 71 66 61 56 NOTE: If subcooling charging conditions are not favorable, charge must be weighed in accordance with unit rating
