Pumping Down - Panasonic CS-A73KE Service Manual

CS-A73KE

2 Pumping down

Refrigerant
Reclaiming
Equipment
Procedure:
(1) Confirm that both the 2-way and 3-way valves are
set to the opened 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 con-
nect the charge set to the service port of the 3-way
valve.
Connect the charge hose with the push pin to the Gas
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 2-way valve to the closed position.
(Indoor unit)
(Liquid side)
CLOSE
Lo Hi
2-way valve
(Gas side)
3-way valve
CLOSE
(6) Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 0 MPa
(0 kg/cm
If the unit cannot be operated at the cooling
condition (weather is rather cool), short the
Pumping Down pins on the Main Control P.C.B.
(Simply press the pumping down button if it is
equipped.)
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
0.1 MPa (1 kg/cm
(8) Use refrigerant reclaiming equipment to
collect refrigerant from indoor unit and pipes.
(9) Disconnect the charge set, and mount the 2-way
and 3-way valve's stem caps 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 out-
door unit.
– 35 –
(Outdoor unit)
Closed
Open
2 G).
2 G) to 0.3 MPa (3 kg/cm 2 G)