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11.2. Pumping down
1.
Confirm that both the 3-way valves are set to the open
position.
position.
•
Remove the valve stem caps and confirm that the valve
stems are in the open position.
stems are in the open position.
•
Be sure to use a hexagonal wrench to operate the valve
stems.
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.
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.
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.
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
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.
(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.
position.
•
Do this quickly so that the gauge ends up indicating 1 to
3 kg/cm
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.
refrigerant from indoor unit and pipes.
9.
Disconnect the charge set, and mount both the 3-way
valve
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.
torque of 18 N.m.
•
Be sure to check for gas leakage.
10.
Disconnect pipes from indoor unit and outdoor unit.
Procedure:
53
CS-A28
BKP5
/CU-A28
BKP5
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