LG LSN090CE Service Manual page 48

Troubleshooting Guide
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).
48 Room Air Conditioner
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 con-
firm that the gauge needle does not move
(approxima-tely 5 minutes after turning off
the vacuum pump).
(4) Disconnect the charge hose from the vac-
uum pump.
– Vacuum pump oil.
If the vacuum pump oil becomes dirty or
depleted, replenish as needed.
Use vacuum pump equipped with check value
applied to be prevented from flowing backward.
Outdoor unit
Open
Open