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<p>R1234y, and it is expensive. I imagine it is developed by Dupont
and they need to get their money back. The patents ran out on
134, so they had to bring in something expensive again. It is
also flammable, So, why couldn't propane be usuable for
refrigerant?? It is also flammable.. But a lot cheaper....</p>
<p>Cecil<br>
</p>
<div class="moz-cite-prefix">On 6/12/2021 8:50 AM, Phil Auten wrote:<br>
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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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