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HVAC
42
REFRIGERATION CYCLE TROUBLESHOOTING
Sr.
No.
Possible Cause
Remedy
1
Insufficient refrigerant
Condition
x
Air conditioner does not cool effective-
ly
Symptoms in refrigerant cycle
x
Pressure on both the high and low
pressure sides is low
x
Air around the air outlet is slightly cold
Cause
x
There is gas leakage in the refrigerat-
ing cycle
Diagnosis
x
Insufficient refrigerant in the refrigerat-
ing cycle
x
Refrigerant leakage
Countermeasures
x
Locate the leakage and
repair
x
Recharge refrigerant to the
specified amount
2
Excessive refrigerant
or insufficient conden-
ser cooling
.
Condition
x
Air conditioner does not cool effective-
ly
Symptoms in refrigerant cycle
x
Pressure on both the high and low
pressure sides is high.
Cause
x
Refrigerant is overcharge in the re-
frigerating cycle causing poor cooling
performance
x
Condenser cooling performance is
poor.
Diagnosis
x
Excessive refrigerant in the refrigerat-
ing cycle.
x
Overcharged refrigerant.
Poor condenser cooling performance.
Countermeasures
x
Clean the condenser.
x
Tighten the fan belt to the
correct tension.
x
Above are all normal
check the refrigerant.