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Fig. 8-4
(4) Do a leak test of all joints of the tubing (both
indoor and outdoor) and both wide and narrow
service valves. Bubbles indicate a leak. Wipe off
the soap with a clean cloth after a leak test.
(5) After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder.
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.
Evacuation
(1) Attach the charge hose end described in the pre-
ceding steps to the vacuum pump to evacuate the
tubing and indoor unit. Confirm that the “Lo” knob
of the manifold valve is open. Then, run the vacu-
um pump. The operation time for evacuation
varies with the tubing length and capacity of the
pump. The following table shows the amount of
time for evacuation:
Manifold valve
Pressure
gauge
Lo
Hi
Vacuum pump
Outdoor unit
Close
Open
Narrow
tube
Wide
tube
Balance
tube
Close
Open
Close
Open
Required time for evacuation
when 30 gal/h vacuum pump is used
If tubing length is
If tubing length is
less than 15 m
longer than 15 m
45 min. or more
90 min. or more
04-396 InverterW_p51-108 ARGO 12/21/04 10:17 AM Page 98