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Posted by Stormin Mormon on September 20, 2009, 8:12 pm
The only time we change gas, is if the unit had R-12, and
then we use 416a. The older units are designed for R-12, and
the newer units come with R-134 in them. Not doing any
conversions.
Never worked on a two stage cooler.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
Chris Why would you want change gas on first place
you put in a system what was design for
yes R-12 is expansive but customer is paying for it
so why would any one try to switch refrigerant?
And yes all new gases Refrigerants are working at
much higher pressures and higher discharge temperatures.
And for those of you that seems bring subcooler in
conversations the subcooler is always use in extreme
low temperatures and definitely not in AC systems
are in refrigerators if you find one system that does that
send or post name and model # of that unit I would
appreciate greatly.
in message
show/hide quoted text
>I work on some old equipment (ice chests, from Leer). The
> older R-12 units used to run about 150 to 170 discharge
> pressure. The R-134a units run more like 225 to 250 or so.
> Anyone else seen this?
> http://dodgeram.org/tech/repair/HVAC/R134a.htm
> Some online checking shows that's about normal. Seems a
> bit
> unusual, after working with R-12 all these years. For the
> first few degrees, the temp F and the PSIG are about the
> same. But when it gets hot, the pressure takes off.
> I can tell that getting used to 410a is going to take a
> while.
> --
> Christopher A. Young
> Learn more about Jesus
> www.lds.org
> .
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> you put in a system what was design for
> yes R-12 is expansive but customer is paying for it
> so why would any one try to switch refrigerant?
> And yes all new gases Refrigerants are working at
> much higher pressures and higher discharge temperatures.
> And for those of you that seems bring subcooler in
> conversations the subcooler is always use in extreme
> low temperatures and definitely not in AC systems
> are in refrigerators if you find one system that does that
> send or post name and model # of that unit I would
> appreciate greatly.