19RAU-SVX01F-E4
Note:
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. Excess cooling demand on evaporator. Check system.
Suction duct abnormally cold. a) Expansion valve too far open. a) Check for superheat and check that
expansion valve bulb is secure.
b) Replace.
Refrigerant flows back to compressor. b) Expansion valve locked in open position.
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.
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