Gree GWC09KF-D3DNA5A Service Manual page 53

Troubleshooting
• Procedure
(1) Confirm that both the 2-way and 3-way 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 3-way valve.
– Connect the charge hose with the push pin 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 2-way valve to the closed position.
(6) Operate the air conditioner at the cooling cycle and stop it
when the gauge indicates 1kg/cm
Indoor unit
Lo
CLOSE
Purge the air
2 g.
Liquid side
Open
2-Way
valve
Gas side
Closed
3-Way
valve
CLOSE
(7) Immediately set the 3-way valve to the closed position.
– Do this quickly so that the gauge ends up indicating 3 to 5kg/
2
cm g.
(8) Disconnect the charge set, and mount the 2-way and 3-
way 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.
Outdoor unit
65