Troubleshooting

Table 14 Compressor and refrigeration system troubleshooting

 

 

 

 

Symptom

Possible Cause

Check or Remedy

 

 

 

 

Power Off

Check main switch, fuses or CBs and

 

wiring

 

 

 

 

Re-set units with overload option

Compressor will not start

Current overload open

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.

 

 

 

No call for cooling

Check monitor status.

 

 

 

 

 

Hold screwdriver over solenoid and check

Compressor will not operate,

Solenoid valve not energizing

for magnetic field. This indicates solenoid

contactor not pulling in

 

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.

 

 

 

Check for low gas pressure. Compressor

Compressor runs for three minutes

Low pressure switch not closing

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.

 

 

 

 

Dirty condenser or drycooler fins

Clean coil.

 

 

 

 

Condenser equipment not operating

Check operation.

 

 

 

High discharge pressure

High refrigerant charge

Check refrigerant charge.

 

 

Hot gas bypass valve adjusted

Adjust properly.

 

 

improperly

 

 

 

 

 

 

Water regulating valve adjusted

Adjust properly.

 

improperly

 

 

 

Excessive fluid flow through condenser

Adjust fluid regulating valve

 

 

 

 

Suction service valve partially closed

Open the valve.

 

 

 

Low discharge pressure

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.

 

 

 

 

Check for leaks, repair, and add

 

Insufficient refrigerant in system

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)

Low suction pressure

 

Defective expansion valve sensing

Replace element

 

 

element

 

 

 

 

 

 

 

Check duct work for closed dampers.

 

Poor air distribution

Check for under-floor restrictions at or

 

 

near the unit.

 

Low condensing pressure

Check head pressure control device.

 

 

 

 

Slipping belts

Inspect and adjust

 

 

 

57

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Emerson 3000/ITR manual Compressor and refrigeration system troubleshooting
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