HVAC (ETC) 25 d. REFRIGERATION CYCLE TROUBLESHOOTING Sr. No. Problem 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. Diagnosis Excessive refrigerant in the refrigerating cycle. Overcharged refrigerant. Poor condenser cooling performance. Countermeasures Clean the condenser. Tighten the fan belt to the correct tension. Above are all normal check the refrigerant. 3 Entry of moisture in the refrigerant cycle Condition Air conditioner alternately cools and does not cool. Symptoms in refrigerant cycle During operation, the pressure on the low pressure side alternates between vacuum and normal. Cause The moisture mixed in the refrigerant in the refrigerating cycle freezes in the expansion valve orifice, blocking the cycle. After a time, the ice melts and normal conditions return Diagnosis The drier is in an oversaturated condition. The moisture in the refrigerating cycle freezes the expansion valve orifice, impeding refrigerant circulation. Countermeasures Remove the moisture by repeated evacuation. Recharge new refrigerant to the specified amount.
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