Troubleshooting

Table 23 Compressor and refrigeration system troubleshooting

 

 

 

 

Symptom

Possible Cause

Check or Remedy

 

 

 

 

Power off

Check main switch, fuses or CBs and

Compressor will not start

 

wiring

 

Current overload open

Re-set units with overload option

 

 

manually. Allow compressor to cool for

 

 

internal overloads to reset.

 

Loose electrical connections

Tighten connections

 

 

 

 

Compressor motor burned out

Check and replace compressor if

 

 

defective.

Compressor will not operate,

No call for cooling

Check monitor status.

 

 

Solenoid valve not energizing

Hold screwdriver over solenoid and check

contactor not pulling in

 

for magnetic field. This indicates solenoid

 

 

 

 

is energized.

 

 

 

 

Low pressure switch not making contact

Check gas pressure - manually energize

 

 

low pressure switch.

Compressor will not operate,

High pressure switch open

Reset switch. Refer to other refrigeration

contact not pulling in

 

troubleshooting suggestions.

Compressor contactor pulled in but

Blown fuse or tripped CB

Check for line voltage after fuses or CBs,

compressor will not operate

 

and after contactors.

 

Low pressure switch not closing

Check for low gas pressure. Compressor

Compressor runs for three minutes

 

is running on Positive Start Kit (air cooled

then stops; contactor drops out.

 

systems only)

 

Liquid line solenoid valve not opening

Check magnetic field to see if energized.

 

 

 

High discharge pressure

Dirty condenser or drycooler fins

Clean coil.

 

 

Condenser equipment not operating

Check operation.

 

 

 

 

 

High refrigerant charge

Check refrigerant charge.

 

 

 

 

Hot gas bypass valve adjusted

Adjust properly.

 

improperly

 

 

Water regulating valve adjusted

Adjust properly.

 

improperly

 

Low discharge pressure

Excessive fluid flow through condenser

Adjust fluid regulating valve

 

 

Suction service valve partially closed

Open the valve.

 

 

 

 

 

Faulty head pressure control valve or

Replace if defective.

 

condenser fan speed control

 

 

Compressor rotation in reverse direction

Check for proper power phase wiring to

 

 

unit and to compressor motor.

 

Insufficient refrigerant in system

Check for leaks, repair, and add

Low suction pressure

 

refrigerant for air cooled. Evacuate and

 

 

recharge for water/glycol unit.

 

Dirty air filters

Change filters.

 

 

 

 

Plugged filter-drier

Replace filter.

 

 

 

 

Improper superheat adjustment

Reset expansion valve for 10-15°F

 

 

(6-8°C)

 

Defective expansion valve sensing

Replace element

 

element

 

 

Poor air distribution

Check duct work for closed dampers.

 

 

Check for under-floor restrictions at or

 

 

near the unit.

 

Low condensing pressure

Check head pressure control device.

 

 

 

 

Slipping belts

Inspect and adjust

 

 

 

59

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Liebert 3000 manual Compressor and refrigeration system troubleshooting

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