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Re: [GMCnet] A/C vacuum pump [message #326240 is a reply to message #326230]

Tue, 21 November 2017 23:24

Richard Denney

Messages: 920
Registered: April 2010

Karma:

Senior Member

Let's be sure to keep things straight, as Rob is doing. The electric pump
in the original post will draw down to 75 microns, which is 29.917 inches
of mercury at sea level. I call that a hard vacuum. It won't survive a
shop's duty cycle, perhaps, but it will work for us if we let it run long
enough. I'll bet shops don't pull a harder vacuum, tough a shop-grade pump
might get there faster.

The air-pressure-operated venturi pump that Tyler posted is the one Matt
(and Rob) warned against. It does not pull a hard enough vacuum to dry an
AC system.

Rick "who got confused" Denney

On Tue, Nov 21, 2017 at 8:20 PM Rob Mueller wrote:

> Tyler,
>
> Air powered vacuum pump = Vacuum level: 28.3 in. of mercury at sea level
>
> See this chart:
> https://www.quora.com/What-happens-to-boiling-point-of-water-in-vacuum
>
> Electric vacuum pump = One stage pump draws vacuum down to 75 micron
>
> The air powered pump will not drop the pressure low enough to boil water
> that is in the system.
>
>
>
> --
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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[Message index]

		[GMCnet] A/C vacuum pump By: Kingsley Coach on Mon, 20 November 2017 20:31
		Re: [GMCnet] A/C vacuum pump By: Ken Henderson on Mon, 20 November 2017 21:50
		Re: [GMCnet] A/C vacuum pump By: midlf on Tue, 21 November 2017 01:37
		Re: [GMCnet] A/C vacuum pump By: USAussie on Tue, 21 November 2017 05:48
		Re: [GMCnet] A/C vacuum pump By: Keith V on Tue, 21 November 2017 09:02
		Re: [GMCnet] A/C vacuum pump By: Ken Henderson on Tue, 21 November 2017 09:43
		Re: [GMCnet] A/C vacuum pump By: Keith V on Tue, 21 November 2017 10:38
		Re: [GMCnet] A/C vacuum pump By: James Hupy on Tue, 21 November 2017 10:50
		Re: [GMCnet] A/C vacuum pump By: James Hupy on Tue, 21 November 2017 11:04
		Re: [GMCnet] A/C vacuum pump By: Keith V on Tue, 21 November 2017 11:07
		Re: [GMCnet] A/C vacuum pump By: emerystora on Tue, 21 November 2017 11:26
		Re: [GMCnet] A/C vacuum pump By: Richard Denney on Tue, 21 November 2017 15:04
		Re: [GMCnet] A/C vacuum pump By: Kingsley Coach on Tue, 21 November 2017 18:01
		Re: [GMCnet] A/C vacuum pump By: Ken Burton on Tue, 21 November 2017 01:48
		Re: [GMCnet] A/C vacuum pump By: Larry on Tue, 21 November 2017 10:16
		Re: [GMCnet] A/C vacuum pump By: Kingsley Coach on Tue, 21 November 2017 11:00
		Re: [GMCnet] A/C vacuum pump By: roy1 on Tue, 21 November 2017 10:48
		Re: [GMCnet] A/C vacuum pump By: Tilerpep on Tue, 21 November 2017 11:35
		Re: [GMCnet] A/C vacuum pump By: Kingsley Coach on Tue, 21 November 2017 13:22
		Re: [GMCnet] A/C vacuum pump By: Dave Stragand on Tue, 21 November 2017 14:36
		Re: [GMCnet] A/C vacuum pump By: tphipps on Tue, 21 November 2017 14:59
		Re: [GMCnet] A/C vacuum pump By: Matt Colie on Tue, 21 November 2017 18:09
		Re: [GMCnet] A/C vacuum pump By: USAussie on Tue, 21 November 2017 19:18
		Re: [GMCnet] A/C vacuum pump By: Richard Denney on Tue, 21 November 2017 23:24
		Re: [GMCnet] A/C vacuum pump By: USAussie on Wed, 22 November 2017 07:14
		Re: [GMCnet] A/C vacuum pump By: k2gkk on Wed, 22 November 2017 07:23
		Re: [GMCnet] A/C vacuum pump By: USAussie on Wed, 22 November 2017 07:29
		Re: [GMCnet] A/C vacuum pump By: jhbridges on Wed, 22 November 2017 10:24

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