LG A2UC146FA0 Service Manual page 44

2-way, 3-way Valve
(2) Evacuation
(All amount of refrigerant leaked)
Vacuum pump
• Procedure
1. Confirm that both the liguid side valve and gas
side valve are set to the opened position.
2. Connect the vaccum pump to the center hose of
the manifold gauge.
3. Connect the service port of the gas side valve to
the low side of the gauge.
4. Connect power supply to outdoor unit.
5. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
6. Close the Low handle of the gauge turn off the
vacuum pump, and confirm that the gauge nee-
dle does not move(approximately 5 minutes
after turning off the vacuum pump).
48 Free Joint Multi Air Conditioner
Liquid side
Indoor unit
Gas side
Liquid side
Indoor unit
Gas side
manifold gauge
Low-
handle
Hi- handle
(OPEN)
(OPEN)
Outdoor unit
Open
2-Way
valve
Open
3-Way
valve
Open
2-Way
valve
Open
3-Way
valve
7. Disconnect the charge hose from the vacuum
pump.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or deplet-
ed,replenish as needed.
8. Mount the valve caps and the service port caps.