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| Re: Harbor Frfeight vacuum pump [message #176797 is a reply to message #176782] |
Sun, 15 July 2012 10:36  |
Erv Troyer
Messages: 125
Registered: February 2004
Location: Lagrange, IN
Karma: 0
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| gbarrow wrote on Sun, 15 July 2012 08:45 |
Anyone have have experience with this vac pump?
How large a compressor/air tank is required to operate it?
Is it adequate for vacuuming automotive ac system?
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That depends on how much vacuum you need to pull. Specs for this pump say it can pull down to 28.3" of mercury. At this pressure water will boil at 69 degrees F. If you plan to use this pump you should make sure you change the receiver/drier in the system, as it won't do a good job of removing moisture.
Better grade vacuum pumps are rated in microns, which measures the pressure left inside the system. There are 25,400 microns in 1 inch of mercury, which is equal to 29.00 inches of vacuum. A really good vacuum pump should be capable of pulling down to 20 microns, which will boil water at less than -40 degrees F. In our service schools we used to hook a vacuum pump to a bell jar, and we could boil water until it froze. Yep, that is possible - ever heard of freeze-dried foods?
Yeah, that is more than you wanted to know - but if you want to learn even more look at Robinaire's page on dehydrating a system:
http://www.robinair.com/acsolutions/acvacuum/acvacuum.php#eff1
Erv Troyer Lagrange, IN
74 Sequoia
reo43@aol.com
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