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AndrOvr
06-07-2002, 05:56 PM
Its any good?
I want evapo temps down to -30 or -40c ;)
Its any better than r404a?

herefishy
06-07-2002, 06:30 PM
R-409A is a interim R-12 replacement. As such due to P/T characteristics, not a good choice for your temperature range, so NOT better thatn 404A in this application. :)

AndrOvr
06-07-2002, 06:31 PM
hmm.. so what temp is capable of?

herefishy
06-07-2002, 06:38 PM
If you have an existing system using "502", for instance, you will not acheive system design or capacity with an R-12 equivalent. If you are spec'ing a new system, you will find that R-12 or equivalent equipment will be impractical in terms of input vs. output, and typically such equippment is not rated for such very low temp applications.

Pick your application, or check your equipment and just go to the books. You may inherently find that it won't do the thingy !!!! :)

herefishy
06-07-2002, 06:40 PM
R-409A is a medium and low temperature R-12 replacement. I would consider it for applications for evaporating temperatures of no less than -10 degF.

AndrOvr
06-07-2002, 06:41 PM
Originally posted by herefishy
R-409A is a medium and low temperature R-12 replacement. I would consider it for applications for evaporating temperatures of no less than -10 degF.

-10F? or -10c?

herefishy
06-07-2002, 06:46 PM
F.....

Mathematically, the refrigerant is capable of absolute zero. ;) However, the equipment that it is typically employed in (R-12 equivalent) is usually not rated for employment at such low operating ranges as you are speaking of.

AndrOvr
06-07-2002, 06:54 PM
soo... I should expect evapo temps around -30c / -10f ...

Preston Roy Powell
07-07-2002, 10:31 PM
R-409

has a nasty like problem.. Its got a 12 degree refrigerant guide. Its not a good one to choose for a freezer. Changing to over is the only choice.