(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

Manifold valve

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/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

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 mmHg, 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.

Pressure gauge

Gas tube

Liquid tube

Lo

Hi

Vacuum pump

Service port ø5/16"

Open

Close

Outdoor unit

Open

Close

Fig. 7-4

66

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Sanyo 85464359981002 installation instructions Evacuation

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