LG LS-B0760CM/B0760HM Service Manual page 50

4. Gas Charging
(After Evacuation)
Charging
cylinder
(1)
• Procedure
(1) 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, also use a scale and
reverse the cylinder so that the system can be
charged with liquid.
(2) 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.
(3) 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 specified
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 approxi-
mately 1 minute and then repeat the procedure
(pumping down-pin).
Indoor unit
Check valve
OPEN
(Low handle)
Liquid side
Open
2-Way
valve
Gas side
Open
3-Way
valve
Manifold
Gauge
CLOSE
(High handle)
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.
(4) Immediately disconnect the charge hose from the
3-way valve's service port.
- Stopping partway will allow the gas to be dis-
charged.
- If the system has been charged with liquid refriger-
ant while operating the air conditioner turn off the
air conditioner before disconnecting the hose.
(5) Mount the valve stem nuts and the service 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.
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Outdoor unit