ALTROZ SERVICE MANUAL

HVAC 28 d. REFRIGERATION CYCLE TROUBLESHOOTING Sr. No. Problem Possible Cause Remedy 1 Insufficient re- frigerant Condition  Air conditioner does not cool effectively Symptoms in refrigerant cycle  Pressure on both the high and low pres- sure 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 refrig- erant or insufficient con- denser cooling . Condition  Air conditioner does not cool effectively Symptoms in refrigerant cycle  Pressure on both the high and low pres- sure sides is high. Cause  Refrigerant is overcharge in the refrigerat- ing 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 ex- pansion 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, im- peding refrigerant circulation. Countermeasures  Remove the moisture by repeated evacuation.  Recharge new refriger- ant to the specified amount.