1853 / 1906
HVAC
39
REFRIGERATION CYCLE TROUBLESHOOTING
Sr.
No.
Possible Cause
Remedy
1
Insufficient refrigerant
Condition
Air conditioner does not cool effectively.
Symptoms in refrigerant cycle
Pressure on both the high and low
pressure sides is low.
Air around the air outlet is slightly cold.
Cause
There is gas leakage in the refrigerating
cycle.
Diagnosis
Insufficient refrigerant in the refrigerat-
ing cycle.
Refrigerant leakage.
Countermeasures
Locate the leakage and re-
pair.
Recharge refrigerant to the
specified amount.
2
Excessive refrigerant
or insufficient conden-
ser cooling
.
Condition
Air conditioner does not cool effectively
Symptoms in refrigerant cycle.
Pressure on both the high and low
pressure sides is high.
Cause
Refrigerant is overcharge in the refrig-
erating cycle causing poor cooling
performance.
Condenser cooling performance is
poor.
Fluid coupling on fan is slipping.
Diagnosis
Excessive refrigerant in the refrigerat-
ing cycle.
Overcharged refrigerant.
Poor condenser cooling performance.
Condenser fins blocked or fan belt
loose.
Slipping radiator fan fluid coupling.
Silicone oil leaking from the coupling.
Countermeasures
Clean the condenser.
Tighten the fan belt to the
correct tension.
Repair the fluid coupling and
adjust silicone oil quantity to
the proper level.
Above are all normal check
the refrigerant.
3
Entry of moisture in the
refrigerant cycle
Condition
Air conditioner alternately cools and
does not cool.
Countermeasures
Remove the moisture by
repeated evacuation.