LG DELUXE HIGH WALL MINI SPLIT Installation Instructions Manual page 16

• 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 varied with
the tubing length and capacity of the pump. The
following table shows the amount of time for
evacuation.
Allow the pump to operate until the system has
been evacuated down to 300 microns. Allow the
pump to continue running for an additional 15
minutes. Turn off the pump and leave the
connections secured to the two service valves.
After 5 minutes, if the system fails to hold 500
microns or less, check all connections for tight
fit and repeat the evacuation procedure.
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 gas
leakage from the system.
5. Replace the vlave caps at both gas and liquid
side service valves and fasten them securely
tight.
This complete air purging with a vacuum pump.
The air conditoner is now ready to test run.
Indoor unit
Manifold valve
Pressure
gauge
Vacuum pump
16