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. To open the 2-way valve turn the valve stem
counterclockwise approximately 90°, wait for
about 2~3 sec, and close it.
4. 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.
5. 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 manifold valve is open. Then, run the vacuum
pump. The operation time for evacuation varies with
tubing length and capacity of the pump. After the
vacuum state is 0,8 torr, continue to vacuumize over
10 minutes more.
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
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.
The air conditioner is now ready to test run.
WARNING:
Use a vacuum pump or inert (nitrogen) gas when doing leakage test or air purge.
Do not comprss air or Oxygen and Do not use Flammable gases.Otherwise,it may cause fire or
explosion.
Air purging and evacutaion
Installation Manual 25