8.2 Pumping down
• Procedure
¤ Confirm that both 3-way(liquid side) and 3-way(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.
¤ŁOperate the unit for 10 to 15 minutes.
¤ØStop operation and wait for 3 minutes, then connect
the charge set to the service port of the 3-way (gas
side) valve.
- Connect the charge hose with the push pin to the
service port.
¤ŒAir purging of the charge hose.
• Open the low-pressure valve on the charge
equipment slightly to purge air from the charge
hose.
¤ºSet the 3-way(liquid side) valve to the closed
position.
¤ Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 1 kg/cm
2
g
¤ Immediately set the 3-way(gas side) valve to the
closed position.
- Do this quickly so that the gauge ends up indicating
3 to 5kg/cm
2
g.
¤ Disconnect the charge set, and mount the
3-way(liquid side) and 3-way(gas side) valve's stem
nuts and the service port nut.
- Use torque wrench to tighten the service port nut.
- Be sure to check gas leakage.
– 45 –
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