LG TB-H488RSS5, Service Manual, Page: 28 / 42

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3-way Valve
1. Pumping down
Lo
Closed
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
3-Way
valve
3-Way
valve
CLOSE
• Procedure
(1) Confirm that both liquid side and 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 valve.
– Connect the charge hose 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 liquid side valve to the closed posi-
tion.
(6) Operate the air conditioner in cooling mode
and stop it when the gauge indicates
1kg/cm
2 g.
(7) Immediately set the 3-way valve to the closed
position.
– Do this quickly so that the gauge ends up indi-
cating 3 to 5kg/cm 2 g.
(8) Disconnect the charge set, and mount the 2-
way and 3-way valve ’s stem nuts and the ser-
vice port nut.
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.