52 Multi Air Conditioner
Air Purging and Evacuation
1. Connect the charge hose end described in
the preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump.
[Each Room] The vacuum pump must be op-
erated less than 0.8torr of the gage pressure.
2. When the desired vacuum is reached, close
the "Lo" knob of the manifold valve and stop
the vacuum pump.
Finishing the job
1. With a service valve wrench, turn the valve
stem of liquid side valve counter-clockwise to
fully open the valve.
2. Turn the valve stem of gas side valve counter-
clockwise to fully open the valve.
3. Loosen the charge hose connected to the gas
side service port slightly to release the pres-
sure, then remove the hose.
4. Replace the flare nut and its bonnet on the
gas side service port and fasten the flare nut
securely with an adjustable wrench. This
process is very important to prevent leakage
from the system.
5. Replace the valve caps at both gas and liquid
side service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready for test running.
: Repeat evacuation procedure for each
indoor unit.
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