ZEST BOLT Service Manual

AIR CONDITIONING 5 STEP 3 - CONNECT PRESSURE GAUGE Sr.No. PROBLEM / SYMPTOMS POSSIBLE CAUSED REMEDY 1 LOW SIDE-HIGH (>3.5 kg/cm2) HIGH SIDE - HIGH (>28 kg/cm2 & Discharge air is warm 1. Large amount of air present in system. This can be because of insufficient evacuation. 2. Dirt in Expansion valve (TXV) 3. Moisture in refrigerant circuit. 1. Discharge the system. 2. Change the filter drier cartridge 3. Evacuate the system 4. Charge refrigerant gas & oil qty. 5. Check performance by ODT/ CDT. 2 LOW SIDE-LOW (<3.5 kg/ cm2) HIGH SIDE - LOW (<28 kg/ cm2 & Discharge air is warm 1. Expansion valve is stuck open 2. Evaporator is getting flooding Change Expansion valve 3 LOW SIDE-HIGH (>3.5 kg/ cm2) HIGH SIDE - HIGH (>28 kg/ cm2 & Discharge air is warm High pressure side tubes are very hot OR Compressor clutch could continually cycle on high 1. Excessive refrigerant quantity, 1. Discharge the system. 2. Change the filter drier cartridge 3. Evacuate the system 4. Charge refrigerant gas & oil qty. 5. Check performance by ODT/ CDT. pressure switch. Pressure does not come down to normal when cooled by water. 2. Poor condenser cooling. Engine fan not working Engine fan direction reverse Check pressure switch connections & Radiator Fan direction. Also check clearance between Radiator & condenser. 3. Condenser FINS are clogged Clean Condenser 4. Radiator Overheating Check Coolant & other radiator problems 5. Check Linear pressure switch & it’s electric terminals If terminals are damaged 1. Discharge the system. 2. Change the Pressure switch 3. Evacuate the system 4. Charge refrigerant gas & oil qty. 5. Check performance by ODT/ CDT. 4 LOW SIDE - low (< 1.8 kg/ cm2) or Vacuum. HIGH SIDE - HIGH (>28 kg/ cm2 & discharge air slightly cool. Expansion valve stuck closed Foreign material or moisture entry 1. Discharge the system. 2. Change the expansion valve (TXV) 3. Evacuate the system 4. Charge refrigerant gas & oil qty. 5. Check performance by ODT/ CDT.