MegaLife ARV Series, Руководство по обслуживанию, Страница: 38 / 172

MegaLife ARV OUTDOOR UNIT
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ARV 6 ALL DC INVERTER T1 50&60HZ Service Manual
38
6. Vacuum Drying
6.1 Selection of vacuum pump
1.
Vacuuming suction must be less than -14.6PSI (756mmHg).
2.
The discharge of vacuum pump is over 4L/s.
3.
The precision of vacuum pump is over 0.001ft.H
2
O (0. 02mmHg)
Note:
1.
Under the normal air pressure, the boiling point of water (steam temperature) is 100 ℃ ,
but the pressure in vacuum pump pipe is near vacuum, this makes the boiling point lower to
below the outside air temperature, and the water in the pipe is evaporated.
2.
After the vacuuming process of R410A refrigerant circulation system is complete,
vacuum pump will stop running. As a result of suction in the in the air conditioning system,
vacuum pump lubricant will seep back into the system. This situation will also occur if
vacuum pump suddenly stops during operation. It will cause different oils mix, leading to
system malfunction, therefore it is recommended to use one-way valve to prevent reverse
flow of oil in vacuum pump.
N2
0.3/1.5/ 4.0 M p a
Pre ssure
re gula ting va lve
Nitroge n pre ssure
ga uge 1#
Nitroge n
pre ssure ga uge 2#
c ut-off va lve
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