Installation Manual
25
ENGLISH
Installation
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.
Cap
2-way valve
(Close)
Gas side
Liquid side
3-way valve
(Close)
Required time for evacuation when 30 gal/h vacuum
pump is used
10 min. or more
15 min. or more
If tubing length is less
than 10m (33 ft)
If tubing length is longer
than 10m (33 ft)
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Pressure
gauge
Open
Close
Indoor unit
Summary of Contents for Wall Mounted Air Conditioner
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