Automotive Air Conditioning Information Forum

Ask whoever you bought the pump from for a Manual, and the correct oil.

Send it out for Calibration.

I have calibrated meters, gauges, micrometers and torque wrenches.

https://www.digivac.com/vacuum-gauge-ca ... -services/

1 Micron = .001 Torr

or

1 micrometer of Hg = 1 milli Torr

We started with a column of Mercury 30 inches tall. Except Atmospheric Pressure limited this to 29.92 inches. 30 inches being an absolute vacuum.

While small fractions of the last inch of mercury were good enough for Crookes to make ...

16 Oz of R134a by weight is 12.09 fluid Oz

The FS 10 depends on the refrigerant flow for lubrication. Unlike the Sanden, it retains very little oil inside.

Or you could put the relay near the clutch, and run the relay coil with a 22 gauge wire...

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Tim:

MVAC was always the red headed step child of HVAC. I learned HVAC from the RSES courses for the refrigeration techs who worked at the big plants. I took those classes in self defense after paying a shop a lot of money to do a poor job on a car I owned.

The first micron gauge I used in class ...

That is a solid pump Tim sells. A good value.

Pump CFM only matters if you are running flat rate labor on 3 bays worth of cars all at once.

I have been telling people for decades on the generations of this forum to buy and use a Micron gauge. It is worth having, both to check the system for leaks ...

First, and foremost the FS10 is NOT A SANDEN. FS10 compressors like some oil in circulation.

Second, Oil Circulation Rates have many changes from system to system.
For instance, years ago when Harrison A6 compressors were OEM, Harrison told us an OCR of 10 to 12% was a good number, in a system ...

3.102 Oil Contamination
The most common cause of a loss in efficiency in a mechanical pump is contamination of oil. It is caused by
condensation of vapors and by foreign particles. The undesirable condensate emulsifies with the oil which is
recirculated and subject to re-evaporation during the ...

Regarding The oil changes on vacuum pumps, A lot depends on what you are sucking up with your pump. But moisture eventually fouls the oil.

Small, direct drive pumps don't hold much oil. So it gets contaminated fast, but it is not bad to change.

For reference I believe Cusser is using a lab pump ...