Troubleshooting - Carrier Omnizone 50XCW06 Installation Start-Up And Operatig Instructions

TROUBLESHOOTING

Refer to Table 14 to determine the possible cause of the problem
and the associated procedure necessary to correct it. See Fig. 34
and 35 for typical wiring.
PROBLEM
Unit will not start
Fan does not operate
Compressor is noisy, but
will start
Compressor starts, but does
not continue to run
Unit is noisy
Unit runs continuously,
but has low capacity
Unit has high discharge
pressure
Discharge pressure too
low
Table 14 — Troubleshooting Procedure
POSSIBLE CAUSE
Loss of unit power
Unit voltage not correct
Open fuse
Open protection device
Unit or motor contactor out of order
Contactor or relay overload or out of order
Motor defective
Broken belt
Loose electrical contact
Under voltage
Defect in compressor motor
Missing phase
Compressor seized
Compressor or contact defect
Unit is not properly charged
Unit is oversized
Compressor is overloaded
Compressor noise
Tube vibration or condenser water problem
Unit panel or part vibrating
Unit is undersized
Low refrigerant or noncondensing gas present Check for leaks and add refrigerant or gas as necessary.
Compressor defect
Insufficient flow of refrigerant in evaporator
Low airflow
Oil in evaporator
Low airflow in condenser
Scale in condenser coil
High temperature in condenser air or air
recirculation
Overcharged
Water connections reversed
Noncondensing gas present
Outdoor temperature too low
Condenser airflow too high
Low charge
Compressor fault
CORRECTION PROCEDURE
Check power source.
Check fuses, circuit breakers, disconnect switch.
Check electrical contacts.
Check and correct.
Check for short circuit in unit.
Check relays, contacts, pressure switches.
Test and replace if necessary.
Test and replace if necessary.
Test and replace if necessary.
Replace belt.
Tighten contact.
Check and correct.
Replace compressor.
Check and correct.
Check and replace if necessary.
Test and replace if necessary.
Check and correct any leaks. Adjust refrigerant charge.
Check load calculation.
Check protection device and replace.
Check for missing phase.
Check TXV.
Check temperature in suction discharge line.
Check TXV and replace if necessary.
Check internal noise.
Check and correct.
Check and tighten appropriate part.
Check heat load calculation.
Replace refrigerant if noncondensing gas present.
Check pressure and amps. Replace if necessary.
Check filter drier and replace if necessary.
Check TXV and adjust or replace if necessary.
Check position of TXV bulb and equalizer.
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.
Drain evaporator.
Check fan rotation.
Check motor, and replace if necessary.
Check belts, and replace if necessary.
Check coils, and clean if necessary.
Clean condenser.
Check for short circuit of air.
Check water supply installation.
Check and recover excess charge.
Adjust subcooling.
Verify and correct.
Verify and correct.
Replace refrigerant.
Install low-ambient control.
Check and adjust.
Check for and repair leaks and add refrigerant as necessary.
Check suction and discharge pressure.
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