LG LP-F8081CL Service Manual page 34

1) Re-airpurging
(Re-installation)
Indoor unit
Gas cylinder
R22
• Procedure
¤ Confirm that both the 3-way (liquid side) valve
and the 3-way(gas side) valve are set to the
closed position.
¤ŁConnect the charge set and a gas cylinder to the
service port of the 3-way(gas side) valve.
• Leave the valve on the gas cylinder closed.
¤ØAir purging.
• Open the valves on the gas cylinder and the
charge set. Purge the air by loosening the flare
nut on the 3-way(liquid side) valve approximately
45° for 3 seconds then closing it for 1 minute;
repeat 3 times.
• After purging the air, use a torque wrench to
tighten the flare nut on liquid side valve.
¤ŒCheck gas leakage.
• Check the flare connections for gas leakage.
Liquid side
Gas side
OPEN
CLOSE
Closed
3-Way
valve
Closed
3-Way
valve
¤ºDischarge the refrigerant.
• Close the valve on the gas cylinder and
discharge the refrigerant until the gauge indicates
3 to 5kg/cm g
2
¤ Disconnect the charge set and the gas cylinder,
and set the 3-way(liquid side) and 3-way(gas side)
valves to the open position.
• Be sure to use a hexagonal wrench to operate
the valve stems.
¤ Mount the valve stem nuts and the service port nut.
• Use torque wrench to tighten the service port nut.
• Be sure to check gas leakage.
–34–
Outdoor unit