2. Pumping down
• Procedure
(1) Confirm that both liquid side and gas side valves
are set to the open position.
- Remove the valve stem caps and confirm that the
valve stems 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 con-
nect the charge set to the service port of the 3-way
valve.
- Connect the charge hose to the service port.
(4) Air purging of the charge hose.
- Open the low-pressure valve on the charge set
slightily to air purge from the charge hose.
(5) Set the liquid side valve to the closed position.
(6) Operates the air conditioner in cooling mode and
stop it when the gauge indicates 1kg/cm
2
g.
(7) Immediately set the 3-way valve to the closed posi-
tion.
- Do this quickly so that the gauge ends up indicat-
ing 3 to 5kg/cm
2
g.
(8) Disconnect the charge set, and mount the 2-way
and 3-way valve's stem nuts and the service port
nut.
- Use torque wrench to tighten the service port nut to
a torque of 1.8kg.m.
- Be sure to check for gas leakage.
- 53 -
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