Table 19 Ð Troubleshooting

SYMPTOMS

 

CAUSE

 

 

 

 

 

REMEDY

COMPRESSOR DOES

 

Power line open

 

 

 

 

 

Reset circuit breaker.

NOT RUN

 

Control fuse open

 

 

 

 

Check control circuit for ground or short.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace fuse.

 

 

High-Pressure Switch (HPS)

 

Move LOCAL/ENABLE-STOP-CCN switch to STOP

 

 

tripped

 

 

 

 

 

position then back to RUN or CCN position.

 

 

Tripped power breaker

 

 

 

Check the controls. Find cause of trip

 

 

 

 

 

 

 

 

 

and reset breaker.

 

 

Loose terminal connection

 

 

 

Check connections.

 

 

Improperly wired controls

 

 

 

Check wiring and rewire.

 

 

Low line voltage

 

 

 

 

 

Check line voltage. Determine location

 

 

 

 

 

 

 

 

 

of voltage drop and remedy de®ciency.

 

 

Compressor motor defective

 

Check motor winding for open or short.

 

 

 

 

 

 

 

 

 

Replace compressor if necessary.

 

 

Seized compressor

 

 

 

 

Replace compressor.

COMPRESSOR CYCLES OFF

 

Loss of charge

 

 

 

 

 

Repair leak and recharge.

ON LOW PRESSURE

 

Bad transducer

 

 

 

 

 

Replace transducer.

 

 

 

 

 

 

 

 

 

Low refrigerant charge

 

 

 

Add refrigerant.

COMPRESSOR SHUTS DOWN

 

High-pressure control erratic in action

 

Replace control.

ON HIGH PRESSURE

 

Compressor discharge valve partially closed

 

Open valve or replace if defective.

CONTROL

 

 

 

Condenser fan(s) not operating

 

Check wiring. Repair or replace motor(s)

 

 

 

 

 

 

 

 

 

 

 

 

if defective.

 

 

Condenser coil plugged or dirty

 

Clean coil.

UNIT OPERATES LONG OR

 

Low refrigerant charge

 

 

 

Add refrigerant.

CONTINUOUSLY

 

Control contacts fused

 

 

 

Replace control.

 

 

 

 

 

 

 

Partially plugged or plugged expansion

 

Clean or replace.

 

 

valve or ®lter driver

 

 

 

 

 

 

 

 

Defective insulation

 

 

 

 

Replace or repair.

 

 

Service load

 

 

 

 

 

Keep doors and windows closed.

 

 

Inefficient compressor

 

 

 

Check valves. Replace if necessary.

SYSTEM NOISES

 

Piping vibration

 

 

 

 

 

Support piping as required.

 

 

Expansion valve hissing

 

 

 

Add refrigerant.

 

 

 

 

 

 

 

 

 

Check for plugged liquid line ®lter drier.

 

 

Compressor noisy

 

 

 

 

Check valve plates for valve noise.

 

 

 

 

 

 

 

 

 

Replace compressor (worn bearings).

 

 

 

 

 

 

 

 

 

Check for loose compressor holddown bolts.

COMPRESSOR LOSES OIL

 

Leak in system

 

 

 

 

 

Repair leak.

 

 

Mechanical damage (blown piston or

 

Repair damage or replace compressor.

 

 

broken discharge valve)

 

 

 

 

 

 

 

 

Crankcase heaters not energized

 

Replace heaters, check wiring and

 

 

during shutdown

 

 

 

 

 

crankcase heater relay contacts.

FROSTED SUCTION LINE

 

Expansion valve admitting either too

 

Check cooler and compressor thermistors.

 

 

much or too little refrigerant

 

Test EXV.

HOT LIQUID LINE

 

Shortage of refrigerant due to leak

 

Repair leak and recharge.

FROSTED LIQUID LINE

 

Shutoff valve partially closed or restricted

 

Open valve or remove restriction.

COMPRESSOR DOES NOT

 

Burned out coil

 

 

 

 

 

Replace coil.

UNLOAD

 

Defective capacity control valve

 

Replace valve.

 

 

 

 

 

Miswired solenoid

 

 

 

 

Rewire correctly.

 

 

Weak, broken, or wrong valve body spring

 

Replace spring

COMPRESSOR DOES NOT

 

Miswired solenoid

 

 

 

 

Rewire correctly.

LOAD

 

Defective capacity control valve

 

Replace valve.

 

 

 

 

 

Plugged strainer (high side)

 

Clean or replace strainer.

 

 

Stuck or damaged unloader piston or

 

Clean or replace the necessary parts.

 

 

piston ring(s)

 

 

 

 

 

 

 

 

EXV Ð Electronic Expansion Valve

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 20 Ð Standard and Accessory Unloaders

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO. OF ACCESSORY

 

 

UNIT

 

NO. OF STANDARD

 

UNLOADERS

 

 

 

 

UNLOADER(s)

 

PERMITTED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Circuit A

Circuit B

 

 

 

30GN040-070

 

 

 

1

 

1

 

1 or 2

 

 

30GN080-170*

 

 

 

2

 

1

 

1

 

 

 

30GN190-210*

 

 

 

0

 

1

 

1

 

*And associated modular units.

66

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Carrier 30GN040-420 operating instructions Troubleshooting, Standard and Accessory Unloaders

30GN040-420 specifications

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