Sanyo XMHX1852, XMHX1252, CHDZR09053, CHDZR14053 Evacuation, 45 min. or more 90 min. or more

(3)Do a leak test of all joints of the tubing (both indoor and outdoor) and all service valves. Bubbles indicate a leak. Wipe off the soap with a clean cloth after a 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 preced- ing steps to the vacuum pump to evacuate the tub- ing 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 follow- ing 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

Evacuation is not necessary for the balance tube if only 1 outdoor unit is installed.

81

	Manifold valve
Pressure	Lo	Hi
gauge

Vacuum pump

Open

Suction tube

Close

Open

Outdoor unit

Discharge tube

Close

Open

Liquid tube

Close

Open

Balance tube

Close

Fig. 7-4

W-3WAY_ECO-i_US.indd 81 2008/02/07 10:56:11