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Service Manual 49
Troubleshooting Guide
Gas Charging
(After Evacuation)
• Procedure
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-
connected 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 cylin-
der 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 refrig-
erant.
– If the system can not be charged with the
specified amount of refrigerant, it can be
charged with a little at a time (approximate-
ly 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 pro-
cedure (pumping down-pin).
(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 condi-
tioner 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.
This unit is charged with R-410A.
Pay attention not to charge R-22.
\
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.
Lo
Charging
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
3-Way
valve
3-Way
valve
OPEN
Open
Check valve
(1)