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Tool Talk Discussion Forum

Re: Air operated vacum pump ?

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tom-ky

06-02-2013 04:14:14
63.141.69.68



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I have done AC work off and on for over 25 years and never had a problem with a system evacuated with my air operated pump. The water will boil in a vacuum as long as you are not doing a repair in extremely cold weather it will boil out. Do a good repair by flushing system and replacing dryer/accumulator then run your pump long enough there should be no problems. One of the biggest problems I have seen is people pull the vacuum on them and call it good, they don't leave it on there long enough to boil out any moisture.

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MarkB_MI

06-02-2013 07:41:24
198.208.251.24



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 Re: Air operated vacum pump ? in reply to tom-ky, 06-02-2013 04:14:14  
Tom, I agree that if you wait long enough, even one of the venturi vacuum pumps will dry out a system. But who really wants to have their air compressor running non-stop for the four or five hours it will take?

Let's assume your venturi will pull down to 28.5 inches/30,000 microns (which is probably generous). The boiling point of water is about 90 degrees F at that temperature. If it's a hot day, that venturi will do a reasonable job of drying the system. Not great, but good enough. But if it's a cool day, it is simply not going to work. To boil water at 70 degrees, you need to get below 20,000 microns, and it's absurd to think you can do that with a venturi. Given that even a garbage HF vacuum pump will pull down to 100 microns, it's really not worth it to use a venturi. The pump will do a better job faster, and use much less electricity.

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tom-ky

06-02-2013 07:51:58
63.141.69.68



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 Re: Air operated vacum pump ? in reply to MarkB_MI, 06-02-2013 07:41:24  
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Mark, I agree if I was going to do more AC work I would buy one of the HF pumps. My MAC pulls over 29" on the gauge. If I have replaced the dryer and flushed the system once it gets done to the lowest reading I generally run a hour or less, my AC training only suggested 30 minutes. Like you said there would be a big difference in electricity usage, even a HF pump would pay for itself instead of hiring out a job if a person is capable of doing the job.

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