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A/C System TroubleShooting (Pg 1)
A/C System Troubleshooting (Pg 2)
A/C System Troubleshooting (Pg 3)
 
 
Home  > Technical Support > TroubleShoot (A/C System) > A/C System TroubleShooting (Pg 1)
 
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A/C System Troubleshooting (Pg 1)

HFC 134a A/C TROUBLE SHOOTING I (REFRIGERATION CIRCUIT ... For Insufficient Cooling . Unusual Pressure)

A/C Bad Phenomenon A/C Pressure Condition Other Bad Phenomenon Result of Diagnosis (Primary Cause) Causes Counter Measures
Insufficient cooling High pressure side (discharge pressure) is high Sight glass is clear (liquid refrigerant stream) It is difficult to appear bubbles in the sight glass even if water is splashed to condenser coil Over charging Take away extra refrigerant from the circuit
Refrigerant don't disappear in the sight glass, even after for around 2sec after turning off A/C switch
High pressure side is very high in idle speed Some hot air comes to front face of condenser Condenser outlet air or radiator outlet heated-air flow back to front face of condenser Close heated-air recirculating place by sealing materials or rubber sheet
--------------- --------------- Much air in refrigeration circuit Replace R/D, charge regulated amount of refrigerant after evacuation
Insufficient air flow for condenser Condenser fin is clogged --------------- Clean condenser coil
Small air flow volume of condenser fan Malfunction of condenser fan Replace condenser fan
No cooling High pressure side is high, low pressure side (suction pressure) is low Discharge pressure is very high after turning on the A/C switch, and bubbles are seen in the sight glass (if charge valve is located after R/D, discharge pressure is unknown) --------------- Choking between compressor and R/D Remove clogged materials, or replace condenser
Insufficient cooling, or no cooling High pressure side is low, low pressure side is low Bubbles are seen in the sight glass Compressor oil oozes at the pipe fittings and components, and response on leak detecter Gas (refrigerant) leaks from the pipe fittings or other components Retighten the fittings or replace the parts
At first, bubbles appear after that bubbles clear in the sight glass --------------- Maladjusted TXV (too much closed), or gas leakage from temperature sensing bulb Readjustment of TXV, or replace expansion valve
--------------- TXV choking Remove choked materials, or replace TXV and receiver dryer (R/D)
Not cools after continuous running, and after a short time it cool again repeatedly, and airflow volume is normal TXV icing due to inside frozen water Replace R/D, and charge refrigerant after evacuation
No air flow, or small air flow volume Evaporator coil fin stuffed with dust Clean evaporator coil fin, or replace evaporator coil
   
 
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