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What pressures are the VIR subjected to?

BG1 on Tue July 20, 2010 12:48 PM User is offline

Year: 1976
Make: Pontiac
Model: Firebird
Engine Size: 455
Refrigerant Type: r134a

I have a VIR that I am trying to bench test and wanted to know what pressure these are subjected to so that I know how much air pressure to connect to it.

fred murry 1 on Tue July 20, 2010 7:07 PM User is offline

From 180 to 220 on the high side.

fonebone on Wed July 21, 2010 1:15 AM User is offline

Hi BG1- A few questions first-- Was this converted to 134 previously? If not, I'd highly recommend staying with r-12. If this VIR unit was not disassembled, and kept hooked up to your system, it will work fine, but NOT with 134. The POA valve is not adjustable for 134, and you will have poor performance. My advice-change the desiccant bag inside that "can" held on by screws with a fresh one and put r-12 in it and enjoy nice cold temps. DO NOT use a "VIR eliminator kit" that you might have heard of. I assure you, you will be very disappointed if you try to convert.

Edited: Wed July 21, 2010 at 1:17 AM by fonebone

BG1 on Wed July 21, 2010 7:40 AM User is offline

Yes this has had the R134A in it and I need to replace a hose so I have adjusted the poa pressure for the R134A and wanted any information that will help. I was asking on another post about my 1990 Chevy truck and it was recommended that the orifice be swapped out for a yellow one but I have not found out the reason.

fonebone on Thu July 22, 2010 1:39 AM User is offline

Hi bg1; I'd like to know how you adjusted the POA valve to work with 134. I have an extra one and thought many times about how it could be reworked. Give me some detailed info if possible. I can understand your desire to pressure test it to confirm the lower (I think around 28.5psi) that the POA valve needs to operate with 134.

BG1 on Thu July 22, 2010 7:19 AM User is offline

This was a topic that another member of this forum posted a step by step process and I followed his instructions and was able to adjust mine from the information in his postings, as mentioned in his information you do have to make a couple of hose adapters. You should be able to go to the search box on this site and search (August 26 2009) and when you get the search results go down to about the 5th posting and it should say (R134a conversion on long dormant Nova.... ) this is the post that will have the information. I will try to post the link back to here where the information is.

fonebone on Fri July 23, 2010 1:11 AM User is offline

Thanks BG1, I remember the topic; it was quite interesting. Glad it worked out for you.

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