Posted by 440roadrunner on May 06, 2009 at 15:37:32 from (98.145.76.31):
In Reply to: A/C help again posted by Bryan in Iowa on May 06, 2009 at 10:04:13:
Bryan in Iowa said: (quoted from post at 10:04:13 05/06/09) What happens when you add more freon ? Most car and truck systems run 250-350 on the high side . I don't have much experiance with ag systems, but I'd think they should be close ?
I'd add freon till it hits 350 ,make sure you have good air flow across condensor , see what happens .
I find that pretty hard to believe. Looking at the R134 chart
http://dodgeram.org/tech/repair/HVAC/R134a.htm
somewhere around 250 psi equates to a condensing temp of 150 degrees!!!
In this part of the woods, for example, on rooftop commercial units, I was used to seeing R22 heads below 300PSI which equates to 130*F or so condensing, and that's on a hot day, not 70F ambient
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