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11.2. Pumping down
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to
the opened position.
• Remove the valve stem caps and confirm that the valve
stems are in the opened 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 Gas
service port.
4. Air purging of the charge hose.
• Open the low-pressure valve on the charge set slightly
to purge air 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 0 PSI (0 kg/cm
2
G).
If the unit cannot be operated at the cooling condition
(weather is rather cool), short the Pumping Down pins
on the Main Control P.C.B.
(Simply press the pumping down button if it is
equipped.)
So that the unit can be operated.
7. Immediately set the 3-way valve to the closed position.
• Do this quickly so that the gauge ends up indicating 14.5
PSI (1 kg/cm
2
G) to 43.5 PSI (3 kg/cm
2
G).
8. Use refrigerant reclaiming equipment to collect
refrigerant from indoor unit and pipes.
9. Disconnect the charge set, and mount the 2-way and 3-
way valve’s stem caps and the service port caps.
• Use a torque wrench to tighten the service port cap to a
torque of 4.05 Ibf.
• Be sure to check for gas leakage.
10. Disconnect pipes from indoor unit and outdoor unit.
47
CS-C9DKU CU-C9DKU / CS-C12DKU CU-C12DKU