LG LS-B0760CM/B0760HM Service Manual page 46

2. Pumping down
Indoor unit
CLOSE
(Low handle
Purge the air
• Procedure
(1) Confirm that both the 2-way and 3-way 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 charge set to the service port of the 3-way
valve.
- Connect the charge hose with the push pin to the
service port.
(4) Air purging of the charge hose.
- Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the 2-way valve to the closed position.
Liquid side
Gas side
Manifold
OPEN
CLOSE
)
(High handle)
Open
2-Way
valve
Closed
3-Way
valve
Gauge
(6) Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 1kg/cm
(7) Immediately set the 3-way valve to the closed posi-
tion.
- Do this quickly so that the gauge ends up indicat-
ing 3 to 5kg/cm
(8) Disconnect the charge set, and mount the 2-way
and 3-way valve's stem nuts and the service port
nut.
- Use torque wrench to tighten the service port nut to
a torque of 1.8kg.m.
- Be sure to check for gas leakage.
- 46 -
Outdoor unit
g.
2
g.
2