AIR CONDITIONING 33 11.13 SYSTEM CHARGING & EVACUATION Use (RRU) for charging. 1. Use vacuum pump and gauge manifold for evacuation and the following equipment is required for system charging. 2. The refrigerant calibration charging cylinder or 3. Weighing device. 3. Pressure gauges and hoses. 4. Electronic leak detector CAUTION: The wearing of safety goggles and gloves is mandatory during system charging or discharging. NOTE: All hoses at point of connection to the system must have isolation valves fitted. Charging the system includes the following steps:- 1. Evacuation and leak test 2. Charging 3. Performance test CHARGING THE SYSTEM After leak check has proven the system to be leak free, charge the proper amount of refrigerant into system as follows :- 1. Open HIGH SIDE manifold hand valve slowly. Fill the system with as much of the specified charge as possible, and then close the high side manifold hand valve. 2. Rotate the compressor by hand for 12 revolutions to ensure no liquid refrigerant is trapped in the suction side of the compressor. Failure to comply with this step may result in irreversible damage to the compressor. 3. Start the engine and engage compressor clutch and evaporator fan on high speed. 4. Set engine speed to 1500 - 1700 rpm. 5. If the system has been charged with the specified amount (580 ± 20 gms), go to step 7.
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