DC Inverter U-match Series for R410A Unitary Split Air Conditioner
3.2.3 Connection Pipe Vacuum Pumping and Leak Detection
3.2.3.1 Vacuum Pumping
①
Make sure the outlet of vacuum pump is away from fire source and is
②
Before vacuum pumping, make sure the unit cut-off valves are closed.
③
When vacuum pumping, both the liquid pipe and the gas pipe must be
(1) Remove the caps of the liquid valve, gas valve and also the service port.
(2) Connect the hoses at the low pressure and high pressure sides of the
manifold valve assembly to the service ports of the unit’s gas valve and
liquid 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)
45
And verify if the pressure gauge at the low pressure side of the manifold valve
assembly reads -0.1MPa, 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. During
this time, the reading of the pressure gauge at the low pressure side can not
be larger than 0.005MPa.
(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.
TU36-24WADU
TU60-24WADU
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