Soap water method
1. Remove the caps from the 2-way and 3-way valves.
2. Remove the service-port cap from the 3-way valve.
3. Apply a soap water or a liquid neutral detergent on the
indoor unit connection or outdoor unit connections by a soft
brush to check for leakage of the connecting points of the
piping.
4. If bubbles come out, the pipes have leakage
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 pressure Gauge is open.
Then, run the vacuum pump.
The operation time for evacuation varies with tubing
length and capacity of the pump. The following table
shows the time required for evacuation.
2. When the desired vacuum is reached, close the knob of
the 3-way valve and stop the vacuum pump.
Finishing the Job
1. With a service valve wrench, turn the valve of liquid
side counter-clockwise to fully open the valve
2. Turn the valve of gas side counter clockwise to fully
open the valve
3. Loosen the charge hose connected to the gas side
service port slightly to release the pressure, 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.
6. Replace the pipe cover to the outdoor unit by one
screw
Now the air conditioner is ready for test run.
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