REFRIGERATION CYCLE TROUBLESHOOTING SR NO OCCURANCE 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 refrigerating • cycle Refrigerant leakage • Countermeasures Locate the leakage • and repair Recharge • refrigerant to the specified amount 2 Excessive refrigerant 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 • refrigerating cycle causing poor cooling performance Condenser cooling performance is poor. • Fluid coupling on fan is slipping. • Diagnosis Excessive refrigerant in the refrigerating • 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. HVAC W/O ETC 28
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