Carrier Supra 950MT Operation & Service Manual

Also see for SUPRA 950Mt: Operation and service manual Operator's manual

6-5 62-118636.3.7 Abnormal Pressure, HeatingHigh discharge pressure Overcharged systemV-belts broken or looseNon-condensibles or refrigerant overchargeMain heat valve (MHV) malfunctionHot gas valve (1HGV or 2HGV) malfunctionCompressor gaskets defective5.4.15.3ReplaceCheck6.3.11CheckLow discharge pressure Compressor valve(s) worn or brokenMain heat valve (MHV) malfunctionLow refrigerant charge5.8Check5.7Low suction pressure Low refrigerant chargeCompressor pressure regulating valve (CPR) malfunctionSuction service valve partially closed5.75.15OpenHigh suction pressure Compressor valve(s) worn or brokenCompressor pressure regulating valve (CPR) not adjustedproperlyCompressor gaskets defectiveHot gas valve (1HGV or 2HGV) malfunctionReplaceAdjustReplaceCheck6.3.8 Abnormal NoiseCompressor Loose mounting boltsWorn bearingsWorn or broken valvesLiquid sluggingInsufficient oilTighten5.85.86.3.105.9Condenser or evaporator fan Loose or striking shroudBearings defectiveBent shaftCheckCheckCheckCompressor Drive System V-belt cracked or wornClutch malfunction5.3Replace6.3.9 Control System MalfunctionWill not control Sensor defectiveRelay(s) defectiveMicroprocessor controller malfunction5.18.2Check5.186.3.10 No Evaporator Air Flow or Restricted Air FlowEvaporator coil blocked Frost on coilDirty coilFan motor(s) malfunctionCheck5.14.1ReplaceNo or partial evaporator airflowV-belt broken or looseClutch defectiveEvaporator fan loose or defectiveEvaporator fan rotating backwardsEvaporator air flow blocked in trailer (box)Fan motor(s) malfunction5.3ReplaceCheck5.3CheckReplace