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Duct Type Unit
25
Model
Time(min)
ADG ECO PLUS 35PH
ADG ECO PLUS 50PH
20
ADG ECO PLUS 71PH
ADG ECO PLUS 85PH
ADG ECO PLUS 100PH
30
ADG ECO PLUS 140PH
ADG ECO PLUS 160PH
45
And verify if the pressure gauge at the low pressure side of the manifold valve
assembly reads -0.1MPa (-750mmHg), if not, it indicates there is leak somewhere.
Then, close the switch fully and then stop the vacuum pump.
(6) Wait for 10min to see if the system pressure can remain unchanged. If the
pressure increase, there may be leakage.
(7) Slightly open the liquid valve and let some refrigerant go to the connection
pipe to balance the pressure inside and outside of the connection pipe, so
that air will not come into the connection pipe when removing the hose.
Note that the gas and liquid valve can be opened fully only after the
manifold valve assembly is removed.
(8) Place back the caps of the liquid valve, gas valve and also the service
port.