HEXA

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.