LG LAN121CNM Service Manual - Page 46

Evacuation

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Troubleshooting Guide Evacuation (All amount of refrigerant leaked) Indoor unit Liquid side 3-Way valve Open Outdoor unit Gas side 3-Way valve Open Vacuum pump OPEN Lo CLOSE • 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). (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. Use vacuum pump equipped with check value applied to be prevented from flowing backward. 46 Room Air Conditioner

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46
Room Air Conditioner
Troubleshooting Guide
Evacuation
(All amount of refrigerant leaked)
•
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).
(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.
Lo
Open
Open
Vacuum pump
3-Way
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
CLOSE
OPEN
Use vacuum pump equipped with check value
applied to be prevented from flowing backward.