11.2. Pumping down
1. Confirm that both the 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 valves.
• Connect the charge hose with the push pin to the gas
side 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 Liquid side 3-way valve to the closed position.
6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 0 kg/cm
2
G.
• If the unit cannot be operated at the cooling (weather is
rather cool), press the Pump Down switch on the Indoor
unit.
• 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 1 to
3 kg/cm
2
G.
8. Disconnect the charge set, and mount both the 3-way
valve’s stem nuts and the service port caps.
• Use torque wrench CWHAD-9211 to tighten the service
port nut to a torque of 1.8 N.m.
• Be sure to check for gas leakage.
Procedure:
49
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH
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