Freezer compressor to stabilizing?

E

Eriksen

Joined
Sep 18, 2005
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181
These can be used both as quiet compressors and vacuum machines, but are they powerful enough to achieve a vacuum of over 28 inHg, and will it be the same strength on refrigerators and freezer compressors?
 
Very few vacuum pumps can achieve beyond 28" of mercury. That is around 95% of theoretical. A good quality commercial unit selling for big bucks may get to 29" Hg, which is close to 99% theoretical. I used to laugh at folks telling me they were pulling 32" Hg and higher on their units. I would ask what planet they were on.

A freezer compressor can work fine as a continuous running vac pump. The life may be hard to guess, but it was probably free to start with. Lots of folks use them for stuff like stabilizing.
 
Stacy E. Apelt - Bladesmith said:
Very few vacuum pumps can achieve beyond 28" of mercury. That is around 95% of theoretical. A good quality commercial unit selling for big bucks may get to 29" Hg, which is close to 99% theoretical. I used to laugh at folks telling me they were pulling 32" Hg and higher on their units. I would ask what planet they were on.

A freezer compressor can work fine as a continuous running vac pump. The life may be hard to guess, but it was probably free to start with. Lots of folks use them for stuff like stabilizing.
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OK!
But is there any difference in force between compressors for refridgerators and freezers or will it be the same for this purpose?
 
For all practical purposes, I doubt there is any difference between a freezer and fridge compressor.
 
The difference is often just the thermostat you put on them. I've turned an upright freezer into a fridge by changing the thermostat.
 
I remember that a guy in a youtube video told that he had to let the compressor suck up lubricating oil in order to prevent damage inside. How often do I need to do that?
 
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