LG LAN091CNP, LAU091CNP, LAN121CNP Service Manual page 59

2. Evacuation
(All amount of refrigerant leaked)
Vacuum pump
• Procedure
(1) Connect the vacuum pump to the center hose
of charge set center hose
(2) Evacuation for approximately one hour.
– Confirm that the gauge needle has moved
toward -76 cmHg (vacuum of 4 mmHg or less).
Indoor unit
Lo
OPEN
Liquid side
3-Way
valve
Gas side
3-Way
valve
CLOSE
(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 dirty or
depleted, replenish as needed.
Troubleshooting Guide
Outdoor unit
Open
Open
Service Manual 59