LG MLP-F8081CL Service Manual page 43

Gas Charging
1) Cooling mode
(After Evacuation)
Charging
cylinder
• Procedure
Connect the charge hose to the charging cylinder.
• Connect the charge hose which you disconnected
from the vacuum pump to the valve at the bottom
of the cylinder.
• If you are using a gas cylinder, use a scale and
reverse the cylinder so that the system can be
charged with liquid.
Purge the air from the charge hose.
• Open the valve at the bottom of the cylinder and
press the check valve on the charge set to purge
the air. (Be careful of the liquid refrigerant). The
procedure is the same if using a gas cylinder.
Open the valve (Lo side) on the charge set and
charge the system with liquid refrigerant.
• If the system can not be charged with the speci-
fied amount of refrigerant, it can be charged with a
little at a time (approximately 150g each time)
while operating the air conditioner in the cooling
cycle; however, one time is not sufficient, wait
approximately 1 minute and then repeat the proce-
dure (pumping down-pin).
Indoor unit
Check valve
Lo
OPEN
(1)
Liquid side
Open
3-Way
valve
Gas side
Open
3-Way
valve
CLOSE
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
Immediately disconnect the charge hose from the
3-way(gas side) valve's service port.
• Stopping partway will allow the gas to be
discharged.
• If the system has been charged with liquid
refrigerant while operating the air conditioner turn
off the air conditioner before disconnecting the
hose.
Mount the valve stem nuts and the service port
nut.
• Use a torque wrench to tighten the service port nut.
• Be sure to check gas leakage.
3-Way Valve
Outdoor unit
Service Manual 43