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Posted by markzoom on February 21, 2007, 8:17 pm
 
On 21 Feb, 19:13, gfretw...@aol.com wrote:

Is Butane any good as a refrigerant? Most of the system would be
outdoors.


Posted by Dan Bloomquist on February 21, 2007, 11:51 pm
 


markzoom@digiverse.net wrote:

Propane is superior to r-22.


Posted by Jeff on February 23, 2007, 4:59 am
 Dan Bloomquist wrote:

You can use isobutane and propane for R-12. Whatever you do, you'll want
a refrigerant close to what it was designed for.

   Jeff

Posted by Neon John on February 21, 2007, 9:23 pm
 On Wed, 21 Feb 2007 12:13:40 -0500, gfretwell@aol.com wrote:



For about $0, one can get a venturi-type compressed-air operated
refrigeration vacuum pump from many places.  Harbor Freight, NAPA,
etc.  It only does about 28" of vacuum but with a new dryer and a
couple of "suck and purge" cycles (add refrigerant, suck it out,
repeat as necessary), the system will be more than dry and airless
enough.

For that matter, the compressor from an old refrigerator or freezer
(free, perhaps, from a used appliance dealer or scrap metal processor)
will do an adequate job.  Not nearly as good as a proper vacuum pump
intended for the purpose but adequate for experimenting and personal
work.

John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
Don't let your schooling interfere with your education-Mark Twain

Posted by Vaughn Simon on February 21, 2007, 10:33 pm
 

     I use a tiny compressor salvaged from a junked out 5000 BTU window unit.
Works fine for my purposes.  When not in use, I keep it sealed up in a used
5-gallon plastic paint can.



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