DC Inverter U-match Series Floor Ceiling Type Unit
31
assembly to the service port of the unit’s gas valve, and meanwhile
the gas and liquid valves should be kept closed in case of
refrigerant leak.
(3) Connect the hose used for evacuation to the vacuum pump.
(4) Open the switch at the lower pressure side of the manifold valve
assembly and start the vacuum pump. Meanwhile, the switch at the
high pressure side of the manifold valve assembly should be kept
closed, otherwise evacuation would fail.
(5) The evacuation duration depends on the unit’s capacity generally.
Model
Time(min)
GUD35W/NhA-T
15
GUD50W/NhA-T
20
GUD71W/NhA-T, GUD85W/NhA-T,
GUD100W/NhA-T, GUD100W/NhA-X
30
GUD125W/NhA-T, GUD140W/NhA-T,
GUD125W/NhA-X,GUD140W/NhA-X,
GUD160W/NhA-X
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 decrease, 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.
