Gree GUD100T/B-S, Руководство пользователя

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DC Inverter U-Match Series Cassette Type Unit
27
NOTICE:
Only for the GUD100W/NhB-S, GUD125W/NhB-S units.
3.2.4 Connection Pipe Vacuum Pumping and Leak Detection
3.2.4.1 Vacuum Pumping
NOTICE!
Make sure the outlet of vacuum pump is away from fire source and is well-
ventilated.
(1) Remove the caps of the liquid valve, gas valve and also the service port.
(2) Connect the hose at the low pressure side of the manifold valve 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)
GUD50T/B-S 20
GUD71T/B-S
GUD100T/B-S
30
GUD125T/B-S 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.