R-404 and R507 are out of the game

[chemi-cool]

It will be a matter of maybe a few years but prices are already soaring.

Any suggestion of replacement for low temp or should I invest in a big stock?

[monkey spanners]

I've been using R407F but not tried it in a freezer. Have also ordered a load of R404A for stock as the price just went up 30% here. Crazy times.

[thebrockenshire]

I have been seeing a bit of R290 Propane getting around, its a really good refrigerant.
I haven't done it myself yet but another company in town has been using R290 with R404A comp and TXV.

[cadwaladr]

Retrofitting 404a to r290? Propane what issues does that present glad I am on the guidelines now it's sounds like danger to me!

[monkey spanners]

Think R448A is being pushed for low temp systems, not tried it.

[cricri]

R448A should be OK for replacements but only in DX systems, glide is around 6/7°K. Nothing yet for flooded or pumped systems, and probably nothing definitively.

[thebrockenshire]

Retrofitting 404a to r290? Propane what issues does that present glad I am on the guidelines now it's sounds like danger to me!

R290 poses no risk while it is inside the system due to the UEL being only 10%, although open contacts in close proximity being a real danger if leaks are present.

[cadwaladr]

Not for transport refrigeration that's for certain,get the drawing board out I would not put it into a reefer unless if was based close to a fire station!