LG FMN0760NL Service Manual page 77

(1) Pumping down
Vacuum pump
Procedure
•
1. Confirm that both the gas side and liquid side
valves are set to the open position.
- Remove the valve stem caps and confirm that
the valve stems are in the raised position.
- Be sure to use a hexagonal wrench to operate
the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then con-
nect the manifold gauge to the service port of
the gas side valve.
- Connect the hose of the gauge with the push
pin to the service port.
4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
5. Set the liquid side valve to the closed position.
Indoor unit
manifold gauge
Low-
handle
(OPEN)
Liquid side
Close
3-Way
valve
Gas side
Open
3-Way
valve
Hi- handle
(CLOSE)
6. Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indi-
cating 1kg/cm
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service
port nut.
- Use torque wrench to tighten the service port
nut to a torque of 1.8kg . m.(4.2kg . m/5.5kg . m)
- Be sure to check for gas leakage.
9. Apply steps from 1 to 8 to each unit (A, B, C, D,
E, F-unit) by the same method.
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Outdoor unit
2 g.
2 g.