LG FMN0760NL, Service Manual

Page: 77 / 122

(1) Pumping down
•
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.
6. Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm 2 g.
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indi-
cating 1kg/cm
2
g.
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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Indoor unit
Outdoor unit
Liquid side
Close
Gas side
3-Way
valve
Open
3-Way
valve
manifold gauge
Vacuum pump
Hi- handle
(CLOSE)
Low-
handle
(OPEN)