Troubleshooting

Table 23 Compressor and refrigeration system troubleshooting (continued)

Symptom

Possible Cause

Check or Remedy

 

 

 

 

Defective or improperly set

Increase superheat or replace valve

 

expansion valve

 

 

Refrigerant 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

 

 

 

Blown valve plate or

Liquid refrigerant floodback or

See Symptom: Flooding

cylinder head in comp.

flooded start

 

 

Blown valve plate or cylinder

Replace gaskets. Retorque cylinder head bolts to

 

head gasket.

compressor manufacturer's specs.

 

Leaky valve plate or worn valve

Replace valve plate assembly

 

seats

Low compressor

 

Leaky suction valves

Pump down, remove cylinder head examine valve and valve

capacity or inability to

seats. Replace if necessary

pull down system

 

 

 

 

Broken connecting rods or

Replace compressor.

 

pistons

 

 

 

Leaking liquid line solenoid valve

Replace valve if clean; clean out valve if dirty.

 

or dirt in valve

 

 

 

Slugging due to floodback of

See Symptom: Flooding

 

refrigerant

 

 

 

Bearings wiped because of loss

See Oil Pressure. Check for defective oil failure control.

 

of oil

Compressor noisy

 

Loose compressor or piping

Tighten clamps.

 

 

support

 

 

 

 

 

 

Broken connecting rods, valves

Replace compressor

 

or other running gear

 

 

Pipe rattle

Loose pipe connections

Check pipe connections

 

 

 

 

Blown valve plate or cylinder

See Symptom: Blown Valve Plate

 

head gasket

 

 

 

Broken suction or discharge

Replace valves and valve plate, if necessary.

 

valve

 

 

Compressor running hot

Compression ratio too high

Check setting of high and low pressure switches. Check

 

condenser-- is it plugged? Check that all evaporator and

 

 

condenser fans are operating properly.

 

Excessive blow-by into

 

 

crankcase -work rings, valves, or

Replace gasket, valve plate, or compressor

 

blown gasket

 

 

Low-pressure switch erratic in

Check tubing to switch to see if clogged or crimped Check

 

operation

for proper switch operation

 

Insufficient refrigerant in system

Check for leaks, fix, and add refrigerant

 

 

 

Compressor cycles

Suction service valve closed

Open valve.

 

 

Insufficient water flowing through

 

intermittently

 

condenser or clogged

Adjust water regulating valve to condenser. Clean

 

 

condenser, or dirty air cooled

condenser.

 

condenser coils

 

 

Discharge service valve not fully

Open valve

 

open

 

 

66

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Emerson VE, VH, DE, DH manual Compressor and refrigeration system troubleshooting
Page 73 Page 75

VE, DH, VH, DE specifications

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