20
CGCL-SVX01B-E4
Maintenance
Symptom
D) The compressor keeps running
without stopping
Temperature too high in areas requiring air-
conditioning.
Chilled water temperature output too high.
E) Loss of oil in compressor
Oil level too low in indicator.
Gradual fall in oil level.
Suction line too cold.
F) Compressor noisy
Compressor knocks.
Suction duct abnormally cold.
G) Insufficient cooling capacity
Thermostatic expansion valve "whistles".
Excess pressure drops through filter drier
Excessive superheat.
Insufficient water flow.
H) Discharge pressure too high
Condenser abnormally hot.
Chilled water leaving temperature too high.
Condenser air output too hot.
Problem cause
Excess load on cooling system.
Excess cooling demand on system.
Not enough oil.
Filter drier clogged.
Liquid flows back to compressor.
Components broken in compressor.
a) Uneven liquid flow.
b) Expansion valve locked in open position.
Not enough refrigerant.
Drier filter clogged.
Superheat not properly adjusted.
Chilled water pipes obstructed.
Presence of uncondensable liquids in system,
or excess refrigerant.
Overload on cooling system.
Reduced air flow. Air intake temperature higher
than specified for unit
Recommended action
Check thermal insulation and air-tightness of
areas requiring air-conditioning.
Check thermal insulation and air-tightness of
areas requiring air-conditioning.
Contact Trane office before to order oil
Replace filter drier.
Adjust superheat and check bulb fixing of the
expansion valve.
Change compressor.
a) Check superheat setting and fixing
of expansion valve bulb.
b) Repair or replace.
Check refrigerant circuit tightness and add
refrigerant.
Replace.
Check adjustment of superheat and adjust
thermostatic expansion valve.
Clean pipes and strainer.
Purge uncondensable fluids and drain off
excess refrigerant.
Reduce load on system.
Reduce water flow if necessary.
Clean or replace air filters. Clean coil. Check
operation of motor fans. See "Condenser fan"
Summary of Contents for CGCL 200
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