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Preparing and Charging the Refrigerant Pipework
V3
Nitrogen gas
30
E-
Performing the Refrigerant Gas Leak Test
Indoor unit
Flaring
connection or
brazed part
pressure
Charging hose
1
Open the V1, V2 and V3 valve after closing the liquid side, gas side and
stop valve. Charge the nitrogen gas in the refrigerant pipe of liquid, gas side
and the indoor unit.
2
Perform pressure test to use oxygen free Nitrogen from 28kgf/cm
3
Close the V1, V2 and V3 valve and apply soapy water to the connection
part of the flaring nut and brazing.
If it is foamy, repair the gas leak.
If the gas does not leak, check that the pressure drops for 24 hours.
(If the pressure drops, the gas of connection part my leak)
4
Discharge the nitrogen gas once the test is completed.
Service port
Refnet joint
Gas pipe
Flange
Flange
connection part
Brazing part
Gauge holder
Low
High
pressure
V1
V2
Gas side stop valve
(All closed)
Outdoor unit
Service port
connection part
Liquid side stop
valve(All closed)
Flaring nut
2
of pressure.
Flaring
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