MegaLife ARV Series, Руководство по обслуживанию, Страница: 34 / 172

MegaLife ARV OUTDOOR UNIT
–
ARV 6 ALL DC INVERTER T1 50&60HZ Service Manual
34
After 24 hours, if the pressure is 3.95MPa and temperature is 20
℃
, it is deemed qualified.
②
Check leakage point.
If there is pressure drop but leakage point can’t be found in pressure test:
1.
Discharge nitrogen until the pressure is 0.3MPa .
2.
Charge R410a refrigerant to 0.5MPa (namely the mixed state of nitrogen and
refrigerant).
3.
Check with halogen lamp, butane gas (petroleum gas) detector and electric detector.
4.
If leakage point can’t be found, recheck by continuously pressurize up to 2.8MPa .
(maximum pressure is 4.0MPa)
5.2 Pre Test tool
nitrogen cylinder
Nitrogen
pressure regulating valve
Nitrogen
pressure gauge
Soap water
(Use of leakage)
Welding device
(Use of leakage)
Connection hose