LG LSC121PMA Service Manual - Page 40

Evacuation

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3. Evacuation (All amount of refrigerant leaked) Indoor unit Liquid side 2-Way valve Open Outdoor unit Gas side 3-Way valve Open Vacuum pump OPEN Lo CLOSE • 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 (approximately 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. -40-

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3. Evacuation
(All amount of refrigerant leaked)
• 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 dirty or
depleted, replenish as needed.
Lo
Open
Open
Vacuum pump
2-Way
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
CLOSE
OPEN
-40-