LG AUUW096D Installation Manual page 40

Indoor Unit Drain Piping
Evacuation
1. If the system is found free from all leakages,
relive the nitrogen pressure by loosening the
charge hose connector at nitrogen cylinder.
Disconnect the hose from cylinder when
pressure reaches to normal state.
2. Evacuation : Connect the charge hose to the
vacuum pump and Connect the "Lo" side hose
to the outdoor unit Which is the gas side valve.
Check that the "Lo" Knob of manifold valve to
open. Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump.
• The degree of vacuum should be under 0.8 Torr.
• When the desired vacuum is reached, close the
"Lo" knob of the manifold valve and stop the
vacuum pump.
3. Once the desired vacuum is created. Disconnect the vacuum pump and open the liquid side valve
stem by turning it to counter-clockwise direction with service valve wrench.
4. Open completely the gas side valve by turning to counter-clockwise with service valve wrench.
5. Remove slowly the charge hose connected to the gas side service port (to release the pressure).
6. Replace back the flare nut and its bonnet on the gas side service port. Fasten the flare nut with
adjustable wrench to prevent any leakage from the system.
7. Fasten back the valve cap on both gas and liquid side service valves.
40
Indoor unit
Outdoor unit
Manifold valve
Lo Hi
Open
Close
Vacuum pump
Vaccum
gauge