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Vacuum Pump FAQs
A Rotary vacuum pump works by mechanically compressing and pushing out the air from inlet to outlet. The outlet pressure therefore has to be higher than atmospheric pressure for exhaust to take place. In two stages rotary pump the outlet of one chamber is connected to inlet of next chamber. This increases the compression and makes the air exhaust possible.
On average, a common AC technician does not need to change oil with two years. Pay attention to oil level, if you used it for long time and oil level is low than minimum, you need to add more oil. Usually you don’t need to add oil.
Usually one of these three reasons trigger oil change:
- Rotary pump starts taking longer to create vacuum or is unable to reach the desired vacuum level.
- Color of oil changes from transparent or golden yellow to dark brown indicating oxidation.
- Some engineers prefer to change oil after a fixed number of working hour which are either recommended by manufacturer or are based on experience.
No, rotary vacuum pump oil cannot be recycled. This is because vacuum pump oils work under very demanding conditions. Used vacuum oil, even if recycled, will still be carrying various contaminants. For the safety of expensive vacuum pump, used oil is best discarded.