LG LM-2421C2L/A2L Service Manual page 36

(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. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
5. 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).
Indoor unit
manifold gauge
Low-
handle
(OPEN)
Liquid side
Close
2-Way
valve
Gas side
Open
3-Way
valve
Hi- handle
(CLOSE)
6. Disconnect the charge hose from the vacuum
pump.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or deplet-
ed,replenish as needed.
7. Mount the valve caps and the service port caps.
8. Apply steps from 1 to 7 to each unit (A-unit, B-
unit) by the same method.
- 36 -
Outdoor unit