"Steve W." wrote:
> Why the switch? R134a is available just about everywhere.
It's not that I want to switch - it's just that I don't know if 134a
recharge kits are available in Canada. These "Red Tek" kits (r12a) are.
r12a (which is mostly propane?) seems to be a more efficient
refrigerant. Can result in lower air temperature and less power
required from the compressor (lower operating pressures too).
> and is illegal for use in mobile A/C under federal law.
I could give two shits about any laws. If it's available and it works -
I'll use it.
> As for evacuating the system, if you don't there will be moisture
Red Tek apparently sells a dehydration treatment which "converts system
moisture into an inert silicone oil which combines with the lubricating
compressor oils". So if the dehydrator works, then the only issue is
some small amount of air in the system (which is mostly what -
nitrogen?).
I suppose I could use the dehydrator, then add the r12a to excess, then
bleed some of it off (thereby reducing the amount of "air" in the
system).
Either that, or I spend $150 on a vacuum pump and gauge kit.
> You will also need to replace the drier and flush the system as
> the drier is not compatible with the oil that R12a,
Red Tek doesn't mention if their product has oil.
> Also you will need to change the hoses to barrier hoses as the
> butane will actually leak through the hoses made for 134a.
Do you have a reference for that?
The (somewhat minimal) wiki page for HC-12a does say:
"Some advantages to using the HC-12a mixture over retrofitting
to R-134a are cost and labor. Since HC-12a is a "drop-in"
replacement, no seals need to be replaced and minimal
effort has to be put in to changing the refrigeration
system around."
It also says that r134a, when combined with refrigerant oil is just as
flamable as hc-12a.