DC Inverter UNI SPLIT Series
Duct
Type Unit
25
2.2.4 Connection Pipe Vacuum Pumping and Leak Detection
2.2.4.1 Vacuum Pumping
NOTE!
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)
ASD-12BI2
ASD-18BI2
20
ASD-24BI2
ASD-36BI2
30
ASD-42BI2
ASD-48BI2
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
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