947 / 1002
HVAC
37
REFRIGERATION CYCLE TROUBLESHOOTING
Sr. No.
POSSIBLE CAUSE
REMEDY
1
Insufficient refriger-
ant
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
repair
Recharge refrigerant to the
specified amount
2
Excessive refriger-
ant or insufficient
condenser 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 quan-
tity to the proper level.
Above are all normal check
the refrigerant.