Pumping Down - Panasonic CS-VA70KE Service Manual

11.2. PUMPING DOWN

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 connect 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.
6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 0 MPa (0 kg/cm G).
If the unit cannot be operated at the cooling condition
(weather is rather cool), press the TEST RUN button 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 G) to 0.3 MPa (3 kg/cm G)
8. Use refrigerant reclaiming
refrigerant from indoor unit and pipes.
equipment to collect
45
CS-VA70KE / CU-VA70KE / CS-VA90KE / CU-VA90KE / CS-VA120KE / CU-VA120KE
9. Disconnect the charge set, and mount the 2-way and 3-
way valves 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.