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MAC9702008C2
CS-MC90KE
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 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.
(Indoor unit)
(Liquid side)
(Outdoor unit)
3-way valve
(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.
Refrigerant
Reclaiming
Equipment
CLOSE
CLOSE
(Gas side)
3-way valve
Open
Close
Lo Hi
Untitled-26 6/25/00, 5:33 PM31
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