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Troubleshooting Guide
3-way Valve
1. Pump down
Indoor unit
Purge the air
• Procedure
(1) Confirm that both liquid side and gas side
valves are set to the open position.
– Remove the valve stem caps and confirm that
the valve stems are in the raised position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(2) Operate the unit for 10 to 15 minutes.
(3) Stop operation and wait for 3 minutes, then
connect the charge set to the service port of
the Gas side valve.
– Connect the charge hose to the service port.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the liquid side valve to the closed posi-
tion.
54 Room Air Conditioner
Liquid side
Gas side
Lo
CLOSE
CLOSE
Open
3-Way
valve
Closed
3-Way
valve
(6) Operate the air conditioner in cooling mode
and stop it when the gauge indicates
1kg/cm
g.
2
(7) Immediately set the Gas side valve to the
closed position.
– Do this quickly so that the gauge ends up indi-
cating 3 to 5kg/cm
(8) Disconnect the charge set, and mount the
Liquid side and Gas side valve's 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.
CAUTION: Do not use the existing
charge set for R-22.
It is necessary to use new charge set for
R-410A. The pressure of R-410A is 1.6 times
higher than that of R-22. Thus, the high pressure
side gauge of charge set should be used higher
pressure gauge of 50kg/cm
Outdoor unit
2
g.
2
range.
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Troubleshooting
