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| Subject: | | Proper R134A pressures |
| Date: | | September 29, 2002 at 14:37:49 |
| Posted by: | | Jim Andrew via: or 68.59.28.227 |
Year: 1987
Make: Porsche
Model: 924S
Refrigerant: R134A
I recently converted my Porsche 924S to R134A after repairing a small leak.
I replaced the receiver dryer,flushed the system,and replaced the
oil with the Polyalpha oil that I see advertised that is supposed to work well with both R134A and R12.
I have read on this board that a good rule of thumb is to charge to 2.2 times the ambient temp.
My ambient temp here in SC is 75 today and I charged to 150 psi.
My duct temps are 42 to 39 degrees which is better than the R12 performance.
My question is when looking at a temperature/pressure chart,the high side pressure for my ambient temp is around 85 psi.
Why is there such a difference?
I didn't try duct temps at the lower pressures.
Thanks in advance for any advice!!
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