Sanyo CHX03652 - Manual (Page 191)

5-3
Test Run and Others
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2
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5
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(3) Do a leak test of all joints of the tubing (both
indoor and outdoor) and both gas tube and liquid
tube service valves. Bubbles indicate a leak. Wipe
off the soap with a clean cloth after the leak test.
(4) 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
preceding 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
vacuum 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:
The required time in the above table is calculated
based on the assumption that the ideal (or target)
vacuum condition is less than -14.7 psig (–755 mm
Hg, 5 Torr).
(2) When the desired vacuum is reached, close the
“Lo” knob of the manifold valve and turn off the
vacuum pump. Confirm that the gauge pressure is
under -14.7 psig (–755 mmHg, 5 Torr) after 4 to 5
minutes of vacuum pump operation.
Manifold valve
Pressure
gauge
Lo Hi
Vacuum pump
Outdoor unit
Liquid
tube
Gas
tube
Close
Open
Close
Open
Service port ø5/16''
Required time for evacuation
when 30 gal/h vacuum pump is used
If tubing length is If tubing length is
less than 49 ft. longer than 49 ft.
45 min. or more 90 min. or more
NOTE
Fig. 5-4
1. Air Purging