Troubleshooting

Table 14 Compressor and refrigeration system troubleshooting (continued)

 

 

 

Symptom

Possible Cause

Check or Remedy

 

 

 

 

Defective or improperly set expansion

Increase superheat or replace valve

 

valve

 

 

Flooding

Evaporator fan motor or belt

Correct problem or replace fan motor and/

or belts.

 

Low condensing pressure

Check head pressure control device

 

 

 

 

Slipping belts

Inspect and adjust

 

 

 

 

Compressor rotation in reverse

Check for proper power phase wiring to

Low compressor capacity or

direction.

unit and to compressor motor.

inability to pull down system

Leaking liquid line solenoid valve or dirt

Replace valve if clean; clean out valve if

 

in valve

dirty.

Compressor noisy

Loose compressor or piping support

Tighten clamps.

 

 

 

Pipe rattle

Loose pipe connections

Check pipe connections

 

 

 

 

 

Check setting of high and low pressure

Compressor running hot

Compression ratio too high

switches. Check condenser -- is it

plugged? Check that all evaporator and

 

 

 

 

condenser fans are operating properly.

 

 

 

 

 

Check tubing to switch to see if clogged or

 

Low-pressure switch erratic in operation

crimped. Check for proper switch

 

 

operation.

 

 

Check for leaks, fix, and add refrigerant on

 

Insufficient refrigerant in system

air cooled unit. Evacuate and recharge

Compressor cycles intermittently

 

water/glycol unit.

 

Suction service valve closed

Open valve.

 

 

 

 

Insufficient fluid flowing through

Adjust fluid regulating valve to condenser.

 

condenser or clogged condenser, or

 

Flush the condenser.

 

dirty air cooled condenser coils

 

 

 

 

 

 

Discharge service valve not fully open

Open valve

 

 

 

 

Faulty low pressure switch

Repair or replace.

 

 

 

 

Dirt or restriction in tubing to pressure

Check and clean tubing.

 

stat

Compressor cycles continually

 

Defective liquid line solenoid valve

Check valve and solenoid operator;

 

 

replace if necessary.

 

 

 

 

 

 

Plugged filter-drier

Replace filter.

 

 

 

 

High discharge pressure

Check for loss of condenser water or

 

blocked condenser fan or coil.

 

 

 

Defective overload relay

Replace.

 

 

 

 

 

Reduce suction temperature by expansion

Compressor motor protectors

High suction temperature

valve adjustment or provide

tripping or cycling

 

desuperheating.

 

Loose power or control circuit wiring

Check all power and control circuit

 

connection

connections.

 

Defective motor

Check for motor ground or short. Replace

 

compressor, if either condition is found.

 

 

 

Low line voltage

Check line voltage and determine location

 

of voltage drop.

 

 

Compressor cycles on locked rotor

Compressor motor defective

Check for motor winding short or ground.

 

 

 

 

Single phasing

Check voltage across all 3 legs at

 

contactor. Correct source problem.

 

 

 

Check control panel for welded

 

Motor burnout

contactor contacts or welded overload

Replace defective components

 

contacts

 

58

Page 64
Image 64
Emerson 3000/ITR manual Compressor and refrigeration system troubleshooting

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