27CGWH-SVX01D-E4
Caution
The above is not a comprehensive
analysis of the Scroll compressor
refrigeration system. The aim is to
give operators simple instructions
on basic unit processes so that
they have the technical knowledge
to identify and bring defective
operations to the notice of qualified
technicians.
Problems symptoms Problem cause Action recommended
I) Suction pressure too high
Compressor operates continuously. a) Expansion valve too far open. Check system.
Suction duct abnormally cold.
Refrigerant flows back to compressor.
b) Expansion valve locked in open position. a) Check for superheat and check that
expansion valve bulb is secure.
b) Replace.
J) Suction pressure too low
Excessive pressure drop through filter drier.
Refrigerant does not flow through thermostatic
expansion valve.
Drier filter clogged.
Expansion valve bulb has lost its refrigerant.
Replace the deshydrator.
Replace the bulb.
Loss of power. Expansion valve obstructed. Replace.
Superheat too low. Excessive pressure drops through evaporator. Check adjustment of superheat and adjust
thermostatic expansion valve.
K) Insufficient cooling capacity
Low pressure drops through evaporator.
Excess cooling demand on evaporator.
Low water flow rate. Check water flow.Check state of strainers,
check for obstruction in chilled water pipes.
Check pressure switch contact in water.
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