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

[Paul Caouette]

Folks,

As a great mentor once told me. Get your information from the initial source. I recommend any good Refrigeration training manual. Many surprises await one who ventures to read up, including what the compressor pumps. 

Sent from my iPhone

On Jul 3, 2013, at 8:13 AM, Joshua Van Tol <josh at spiny.com> wrote:

> 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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