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CAUTION
• To avoid nitrogen entering the refrigerant
system in a liquid state, the top of the cylinder
must be higher than its bottom when you
pressurize the system. Usually, the cylinder is
used in a ver- tical standing position.
Evacuation
Connect the charge hose and described in the
preceding steps to the vacuum pump to evacuate
the tubing and indoor unit. Confirm the "L0 and Hi"
knob ofthe manifold valve is open. Then, run the
vacuum pump. The operation time for evacuation
varies with tubing length and capacity of the pump.
The following table shows the time required for
evacuafion.
Required time for evacuation when 30 gal/h
vacuum pump is used
If tubing length is less
than 10 m(33 ft)
30 min. or more
0.8 torr or less
lf tubing length is
longer than 10 m(33 ft)
60 min. or more
AFTER INSTALLATION
• When the desired vacuum is reached, close the
"Lo and Hi" knob of the manifold valve and stop
the vacuum pump.
Finishing the job
• With a service valve wrench, turn the valve stem
of liquid side valve counter-clockwise to fully
open the valve.
• Turn the valve stem of gas side valve counter-
clockwise to fully open the valve.
• Loosen the charge hose connected to the gas
side service port slightly to release the pressure,
then remove the hose.
• Replace the flare nut and its bonnet on the gas
side service port and fasten the flare nut se-
curely with an adjustable wrench. This process is
very important to prevent leakage from the
system.
• Replace the valve caps at both gas and liquid side
service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
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