Carrier 50CR installation instructions Observe all warnings, cautions, and bold text

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HEAT PUMP WITH PURON

REFRIGERATION SECTION QUICK-REFERENCE GUIDE

Puron refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement components are designed to operate with Puron. Puron refrigerant cylinders are rose colored.

SPuron refrigerant cylinders manufactured prior to March 1, 1999, have a dip tube that allows liquid to flow out of cylinder in upright position. Cylinders manufactured March 1, 1999 and later DO NOT have a dip tube and MUST be positioned upside down to allow liquid to flow.

SRecovery cylinder service pressure rating must be 400 psig. DOT 4BA400 or DOT BW400.

SPuron systems should be charged with liquid refrigerant. Use a commercial-type metering device in the manifold hose. S Manifold sets should be 750 psig high side and 200 psig low side with 520 psig low side retard.

S Use hoses with 750 psig service pressure rating.

S Leak detectors should be designed to detect HFC refrigerant. S Puron, as with other HFCs, is only compatible with POE oils. S Vacuum pumps will not remove moisture from oil.

S Only use factory-specified liquid-line filter driers with rated working pressures no less than 600 psig. S Do not install a suction-line filter drier in liquid line.

S POE oils absorb moisture rapidly. Do not expose oil to atmosphere. S POE oils may cause damage to certain plastics and roofing materials. S Wrap all filter driers and service valves with wet cloth when brazing. S A Puron liquid-line filter drier is required on every unit.

S Do not use an R-22 TXV.

S Never open system to atmosphere while it is under a vacuum.

S When system must be opened for service, break vacuum with dry nitrogen and replace filter driers. S Do not vent Puron into the atmosphere.

S Observe all warnings, cautions, and bold text.

S Do not leave Puron suction line driers in place for more than 72 hrs.

50CR

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Contents Table of Contents Installation InstructionsElectrical Shock Hazard Safety ConsiderationsEquipment Damage Hazard IntroductionRoof Curb for Small Cabinet Roof Curb for Large Cabinet Unit Leveling Tolerances 50CR024-036 Unit Dimensions 50CR042-060 Unit Dimensions Inspection Rig and Place UnitUnit Falling Hazard Property Damage HazardRigging Bracket Under Unit Rain Lip Provide for Condensate Disposal Select and Install DuctworkElectrical Operation Hazard Physical Data Unit 50CR Typical InstallationConnecting Ground Lead to Ground Screw Routing Power Leads Into UnitRouting Control Power Wires HIGH-VOLTAGE ConnectionsElectrical Data-50CR Electrical Data Legend Wiring Schematics-50CR Single Phase Wiring Schematics-50CR Three Phase Line Power Connections Accessory InstallationUnit Start-Up PRE-START-UP FIRE, EXPLOSION, Electrical Shock HazardSTART-UP Status Code 37, Heater Output Sensed on When not Energized Status Code 45, Control Board Test FaultStatus Code 44, Motor Communication Fault Verify Motor Winding SectionStatus Code 41, Blower Motor Fault Status Code 36, Heater Output not Sensed When EnergizedStatus Code 16, System Communication Fault Status Code 25, Invalid Motor / Model SelectionCheck for Refrigerant Leaks Start-Up AdjustmentsSequence of Operation Typical Heat Pump Operation, Cooling Mode Defrost Control Electric Heat Pressure Drop Table Small Cabinet Unit Operation Hazard MaintenancePersonal Injury and Unit Damage Hazard Indoor Blower and Motor Air FilterOutdoor Coil, Indoor Coil, and Condensate Drain Pan Outdoor FanMetering Devices-TXV & Accurater Piston Pressure SwitchesIndoor Airflow Personal INJURY, Unit Operation Hazard High-Pressure SwitchEXPLOSION, FIRE, Electrical Shock Hazard Troubleshooting LOSS-OF-CHARGE SwitchSTART-UP Checklist System InformationObserve all warnings, cautions, and bold text Troubleshooting Chart Head pressure too low Troubleshooting Chart Cont’dSTART-UP Checklist
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