Best refrigerator..R404a or R507a

[AndrOvr]

What would u pick for a R134a based compressor - danfoss NL11F for the lowest temp possible w a heat load around 180w.

[Gary]

Helium. :D

[herefishy]

ROFLMAO !!!!!!!!

[AndrOvr]

Originally posted by Gary
Helium. :D

LOL!
Ok.. seriusly.. what's the best, r404a or r507a?

[herefishy]

Hi AndrOvr,

I presume you're voiding the warranty on your Prommie. I have good experiences with putting R-404A 'em. Never tried R-507A.

[AndrOvr]

R404a as a boiling point of -46.6c and R507a as -47.1 I think... Now, as far as thermal conductivity, dont know whitch one is the best :P

[DaBit]

According to a AC/R engineer who has tried both in a Prommie, R507 gives you slightly lower temps than R404a.

[superheat]

Long time ago, I put 502 into a R12 compressor. It did not last the night.

They must be making those 134a compressors tough these days.

[AndrOvr]

R22 in a r12 compressor... it will last?
LOL
or the compressor will fail?

[Gary]

When you put a high pressure refrigerant in a compressor that is designed for low pressure refrigerant, you take your chances. Maybe it will last, and maybe it won't.

[ice_cool]

R404a is more commonly used. so it is better in most cases.

[camerond]

I've used both R404A and R507A and have done a bit of reading up on them in the past since they're of such similar composition. From what i've heard some company just wanted a piece of the money that R507A sales was making, so they added a little R134a to the mix to get around the copyright. R507A performs better though and it has been tested and proven that you can even put R507A into a R404A system without any problems. R507A also has the advantage of being an azeotrophic blend. In my opinion R507A is better, but at the end of the day it's still just my opinion. I do however use R404A for things like ice machines so the charge can still be weighed in.