NANO

HVAC 845 HVAC 5 6 7 8 9 10 INSPECT CONDENSER Is it okay? VERIFYWHETHERMALFUNCTION IS IN EXPANSION VALVE, RECEIVER/ DRIER AND REFRIGERANT LINES OR ELSEWHERE Are refrigerant’s high-pressure and low- pressure values low? VERIFYWHETHERMALFUNCTION IS IN EXPANSION VALVE AND RECEIVER/DRIER OR ELSEWHERE Immediately after A/C compressor operates, does refrigerant’s high- pressure value momentarily rise to correct value, then fall and stay below it? ( Is there negative pressure on low- pressure side?) VERIFYWHETHERMALFUNCTION IS IN EXPANSION VALVE OR RECEIVER/DRIER Turn A/C switch off and air conditioner stop for 10 minutes. Start engine. Turn both A/C switch and fan switch on. Does mal funct ion occur af ter compressor turn on? VERIFY THAT EXPANSION VALE HEAT-SENSING TUBE WITHIN COOLING UNIT IS POSITIONED SECURELYAND CORRECTLY Is expansion valve heat-sensing tube within cooling unit securely installed in proper position? INSPECT REFRIGERANT LINES Inspect refrigerant lines • Is piping free of damage and cracks? • Are piping connections free of oil grime? (Visual inspection) • Are piping installation points on condenser free of gas leakage? Yes Adjust refrigerant to specified amount. ( Excessive amount of refrigerant.) No Replace condenser, or repair and clean condenser fins. Yes Go to next step No Go to step 14 Yes Go to next step No Go to step 10. Go to next step Replace condenser and vacuum refrigerant line more than 30 minutes by vacuumpump, and refrigerant to specified level. ( Since water has intermixed in receiver/dr ier and i t is saturated, replacement is necessary.) Replace expansion valve. ( Since valve closes too much replacement is necessary.) Install heat-sensing tube securely in proper position. Go to next step I f piping or an A/C component is damaged or cracked, replace it. Go to next step Yes No Yes No Yes No STEP INSPECTION ACTION