Subject: Re: Conversion to R-123A on My 1991 20V Turbo

[Joshua Van Tol]

Very nice explanation Pat. Although technically AC compressors can pump a
small amount of liquid mixed in with the refrigerant vapor. It's just that
in well designed and properly charged systems, they don't. Too much liquid
at once, or too many droplets of liquid over time will cause problems,
usually broken reed valves, but sometimes other things.

Bottom line: Use a vacuum pump. Properly evacuating an ac system before
charging improve performance, reduces the chance of failure and is a good
first test for leak tightness of the system. If you can't pull a good
vacuum, you need to stop and find out why, otherwise you'll just waste your
refrigerant, and be right back at it looking for the leak.

Josh


On Tue, Jul 2, 2013 at 11:12 PM, Project Pat <psdooley at verizon.net> wrote:

> AC compressors don't pump liquid, hopefully just vapor and oil mist.
> The liquefaction takes place in the condenser, downstream from the comp.
>
> The air reduces cooling efficiency, introduces moisture which produces
> acids, and thermally insulates the refrigerant which reduces heat transfer
> and raises the head pressure.
>
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]
> On
> Behalf Of Huw Powell
> Sent: Tuesday, July 02, 2013 4:15 PM
> To: quattro at audifans.com
> Subject: Re: Subject: Re: Conversion to R-123A on My 1991 20V Turbo
>
>
> > 1.) You will have some air in the system, air is not compressible
>
> Yes it is.  There just shouldn't be any air in the system.
>
> The problem is the opposite - the system can't liquefy air at the temps
> and pressures it operates at, so the compressor/pump can't pump it.
> Perhaps that is what the OP meant.
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