Pumping Down - Panasonic CS-C18DKU Service Manual

11.2. Pumping down

Procedure:
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 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
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 close position.
6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 0 kg/cm
If the unit cannot be operated at the cooling condition
(weather is rather cool), press the Pump Down switch
on the Indoor Unit.
So that the unit can be operated.
7. Immediately set the gas side 3-way valve to the close
position.
• Do this quickly so that the gauge ends up indicating 1 to
2
3 kg/cm G (14.5 PSI to 43.5 PSI).
8. Use refrigerant reclaiming
refrigerant from indoor unit and pipes.
9. Disconnect the charge set, and mount both the 3-way
valve's stem nuts and the service port caps.
• Use a torque wrench to tighten the service port cap to a
torque of 4.05 lbf.
• Be sure to check for gas leakage.
10. Disconnect pipes from indoor unit and outdoor unit.
47
CS-C18DKU CU-C18DKU / CS-C24DKU CU-C24DKU
2
G (0 PSI).
equipment to collect