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 open 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
2
G (0 MPa).
•
If the unit cannot be operated at the cool 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
3 kg/cm
2
G (0.1 MPa to 0.3 MPa).
8.
Use refrigerant reclaiming equipment to collect
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 18 N.m.
•
Be sure to check for gas leakage.
10.
Disconnect pipes from indoor unit and outdoor unit.
Procedure:
53
CS-A28BKP5/CU-A28BKP5
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