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(4) Do a leak test of all joints of the tubing (both indoor and
outdoor) and both gas and liquid 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 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:
Required time for evacuation
when 30 gal/min. vacuum pump is used
If tubing length is
less than 15 m
45 min. or more
NO TE
The required time in the above table is calculated based on the
assumption that the ideal (or target) vacuum condition is less
than –101 kPa {–755 mmHg, 5 Torr}.
(2) When the desired vacuum is reached, close the "Lo"
knob of the manifold valve and turn off the vacuum pump.
Please confirm that the gauge pressure is under –101 kPa
{–755 mmHg, 5 Torr} after 4 to 5 minutes of vacuum pump
operation.
If tubing length is
longer than 15 m
90 min. or more
Manifold valve
Vacuum
gauge
Gas
tube
Liquid
tube
40
Lo
Hi
Vacuum pump
Open
Close
Open
Close
Outdoor unit
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