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.
