RE: [DML] Optimal R134a AC pressures
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RE: [DML] Optimal R134a AC pressures



The best way to set your charge with R12 is sixty 60# of REST pressure. That
is engine off and high/low pressures equalized.


Rob Grady,


P.J.Grady Inc.



From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Sent: Friday, May 30, 2008 11:00 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Optimal R134a AC pressures


While the number of pounds of refrigerant might be handy when first 
charging an empty system, it is not actually useful in my case where 
I'm servicing an existing system that is partially (mostly) charged.

Does anyone actually have optimal pressure values rather than rule 
of thumb refrigerant amounts? I guess my next step would be to run a 
sweep of pressures and measure cooling performance to ensure I hit 
the sweetest spot, but that's a pain.


--- In HYPERLINK ""dmcnews@xxxxxxxxxxxxxxxx,
Farrar <fhudkins@..-.> wrote:
> My instructions say 85% of the original recommended R-12 charge. 
(e.g. 2 
> pounds R-12 would mean no more than 1.7 pounds R-134a) However, I 
> seen recommendations for 80% or 90%.
> Farrar Hudkins
> #2613 (auto)
> ksgrimsr wrote:
> > 
> > 
> > I serviced my R134a AC setup this weekend and it is performing 
well. I
> > used the pressure tables in the service manual to set it up.
> > 
> > Obviously, the pressure tables in the workshop manual are for 
> > Does anyone have the pressuve values for optimal R134a 
performance? I
> > want to make sure my system is running as efficiently as 
> > 
> > Knut


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