Carrier Omnizone 50XCR06 Installation, Start-up And Service Instructions Manual

Contents

21TROUBLESHOOTINGRefer to Table 14 to determine the possible cause of theproblem and the associated procedure necessary to correct it.See Fig. 15-17 for typical wiring schematic.Table 14 — Troubleshooting ProcedureLEGENDPROBLEM POSSIBLE CAUSE CORRECTION PROCEDUREUnit will not Start Loss of unit power Check power source.Check fuses, circuit breakers, disconnect switch.Check electrical contacts.Unit voltage not correct Check and correct.Open fuse Check for short circuit in unit.Open protection device Check relays, contacts, pressure switches.Unit or motor contactor out of order Test and replace if necessary.Fan does not Operate Contactor or relay overload or out of order Test and replace if necessary.Motor defective Test and replace if necessary.Broken belt Replace belt.Loose electrical contact Tighten contact.Compressor is Noisy, butwill StartUnder voltage Check and correct.Defect in compressor motor Replace compressor.Missing phase Check and correct.Compressor seized Check and replace if necessary.Compressor Starts, butdoes not Continue to RunCompressor or contact defect Test and replace if necessary.Unit is not properly charged Check and correct any leaks. Adjust refrigerant charge.Unit is oversized Check heat load calculation.Compressor is overloaded Check protection device and replace.Check for missing phase.Check TXV.Check temperature in suction discharge line.Unit is Noisy Compressor noise Check TXV and replace if necessary.Check internal noise.Tube vibration or condenser water problem Check and correct.Unit panel or part vibrating Check and tighten appropriate part.Unit Runs Continuously,but has Low CapacityUnit is undersized Check heat load calculation.Low refrigerant or noncondensing gas present Check for leaks and add refrigerant or gas as necessary.Replace refrigerant if noncondensing gas present.Compressor defect Check pressure and amps. Replace if necessary.Insufficient flow of refrigerant in evaporator Check filter drier and replace if necessary.Check TXV and adjust or replace if necessary.Check position of TXV bulb and equalizer.Low airflow Check filters, and clean or replace as necessary.Check coils, and clean as necessary.Check for restrictions in ductwork.Check fan rotation and adjust.Check fan motor.Check belts for wear.Oil in evaporator Drain evaporator.High Discharge Pressure Low airflow in condenser Check fan rotation.Check motor, and replace if necessary.Check belts, and replace if necessary.Check coils, and clean if necessary.Scale in condenser coil Clean condenser.High temperature in condenser air or airrecirculationCheck for short circuit of air.Check water supply installation.Overcharged Check and recover excess charge.Adjust subcooling.Water connections reversed. Verify and correct.Noncondensing gas present Verify and correct. Replace refrigerant.TXV — Thermostatic Expansion Valve