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<p>OK, so if R134a is no longer blessed by the EPA, what is the
preferred refrigerant for automotive use? I am not up on all of
this as I haven't had to have an AC system repaired since about
2005.</p>
<p>Phil in TX<br>
</p>
<div class="moz-cite-prefix">On 6/11/2021 10:35 PM, Brad Loomis
wrote:<br>
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<div dir="ltr">I hope you meant a detector for the current
refrigerants and not NH3. Ammonia only requires your nose or a
sulphur stick. And for those that may want to try their hand at
refrigeration, a lot of the newer domestic/commercial units use
either propane, R290 or isobutane R600a, as refrigerant. I'm not
sure what the automotive industry is going to move to. I got out
of commercial refrigeration not long after the requirements to
recover and the end of R12, R22, R502, R11, and the rest of the
chlorinated fluorocarbons.It was an awful time never knowing
what someone put into what system. Then came 410a in A/C. Now
that's going away. Customers didn't like to hear, we don't use
that refrigerant, we'll have to recover it, time consuming, and
charge your system with an EPA approved refrigerant, maybe have
to change the oil, etc, etc, equipment was slow so labor costs
were absurd. Like I said, ammonia is safe, easy, efficient, and
well, dangerous in the wrong hands. :)
<div>And the bigger warning would be to never pressure test any
system with oxygen. </div>
<div>And by this discussion it is apparent why automotive is the
driving force for EPA to regulate what goes into the
atmosphere. A billion leaking autos is a lot of gas into the
atmosphere. It just moved to HVAC and refrigeration because of
the same gasses. </div>
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