N Series Floor Ceiling Type Unit
26
(5) The evacuation duration depends on the unit’s capacity, generally.
Model
Time(min)
20
30
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 b ack t he caps of t he liquid valve, ga s valve and a lso t he service
port.
NOTICE:
For large-size units, there are maintenance ports for liquid valve
and gas valve. During evacuation, you may connect the two hoses of the branch
valve assembly to the maintenance ports to speed up the evacuation.
CH-F050NK
CH-F071NK
CH-F085NK
CH-F100NK
CH-F125NK
CH-F140NK
CH-F160NK
