LG AS-C076QLA0 Service Manual page 39

2. Evacuation
Vacuum pump
• Procedure
(1) Connect the vacuum pump to the charge set's
center hose
(2) Evacuation for approximately one hour.
– Confirm that the gauge needle has moved
toward -76 cmHg (vacuum of 4 mmHg or less).
(3) Close the valve (Lo side) on the charge set,
turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
(4) Disconnect the charge hose from the vacuum
pump.
– Vacuum pump oil.
If the vacuum pump oil becomes dir ty or
depleted, replenish as needed.
Indoor unit
Lo
OPEN
Liquid side
2-Way
valve
Gas side
3-Way
valve
CLOSE
Use vacuum pump equipped with check value
applied to be prevented from flowing backward.
-38-
Outdoor unit
Open
Open
CAUTION