Pumping Down - Panasonic CU-C18CKV Service Manual

CS-C18CKV CU-C18CKV / CS-C24CKV CU-C24CKV

11.1.2. Pumping down

Procedure:
1. Confirm that both the 3-way valves are set to the open
position.
• • • • Remove the valve caps and confirm that the valve caps
are in the raised 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
manifold gauge to the service port of the 3-way valve as
shown above.
• • • • Connect the manifold gauge to the gas side service
port.
4. Air purging of the charge hose.
• • • • Open the Low pressure side valve of manifold gauge
slightly to purge air from the charge hose.
5. Set the liquid side (High side) 3-way valve to the close
position.
6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 0.1 MPa.
• • • • If the unit cannot be operated at the cooling (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 (Low side) 3-way valve to
the close position.
• • • • Do this quickly so that the gauge ends up indicating 0.1
0.3 MPa.
8. Disconnect the manifold gauge, and mount both the
3-way valve's caps and the service port caps.
• • • • Use torque wrench to tighten the service port nut to a
torque of 18 N.m.
• • • • Be sure to check for gas leakage.
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