LG LP-K3020HL Service Manual page 33

2) Heating Mode
(After Evacuation)
Charging
cylinder
Check valve
• Procedure
(1) Connect the charge hose to the charge 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.
(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
approximately 1 minute and then repeat the
procedure (pumping down-pin).
Lo
OPEN
(1)
Indoor unit
CLOSE
Liquid side
Open
3-Way
valve
Gas side
Open
3-Way
valve
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
discharged.
• If the system has been charged with liquid
refrigerant 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 a torque wrench to tighten the service port nut.
- Be sure to check gas leakage.
–33–
Outdoor unit