LG LP-8091PC, Service Manual

Page: 26 / 52

7-2. Pump down
• Procedure
① Confirm that both 3-way(liquid side) and 3-
way(gas 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
connect the charge set to the service port of the
3-way (gas side) 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
equipment slightly to purge air from the charge
hose.
⑤
Set the 3-way(liquid side) valve to the closed
position.
⑥ Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1 kg/cm
2
g
⑦
Immediately set the 3-way(gas side) valve to the
closed position.
- Do this quickly so that the gauge ends up
indicating 3 to 5kg/cm
2
g.
⑧ Disconnect the charge set, and mount the
3-way(liquid side) and 3-way(gas side) valve's
stem nuts and the service port nut.
- Use torque wrench to tighten the service port nut.
- Be sure to check gas leakage.
Lo
CLOSE CLOSE
Purge the air
Gas side
Liquid side
Indoor unit
Outdoor unit
Closed
Open
3-Way
valve
3-Way
valve
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