Heat Controller VMC30SB-1/VMH30SB-1 用户手册

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Only for training and service purposes

Part 4 Trouble Shooting

• Procedure

(1) Connect the vacuum pump to the center hose

of charge set center hose

(2) Evacuation for approximately one hour.

– Confirm that the gauge needle has moved

toward 0.8 Torr (2PSF).

(3) Close the valve (Lo side) on the charge set,

turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).

(4) Disconnect the charge hose from the vacuum

pump.
– Vacuum pump oil.

If the vacuum pump oil becomes dirty or
depleted, replenish as needed.

Open

Vacuum pump

3-Way
valve

Outdoor unit

Liquid side

Indoor unit

Gas side

3-Way
valve

OPEN

Vacuum
Gage

OPEN

3. Evacuation