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View Full Version : Argh! 507 system charged with 404A... expected problems?


Clk320_Greg
20-10-2009, 03:34 PM
Ive got a multideck thats been charged with 404A after a compressor change. have just found out that origional manufacture used 507 in the system.

Its been working fine for the last 3 weeks now, but can i expect any probelms? Different oils? Different charges?


Cheers!
monkey spanners
20-10-2009, 04:06 PM
The oils will be the same, i think R404A is R507 with a bit of R134a mixed in. R404A txv's are marked up to work with R507 as well. So my money would be on ok, but i don't know for sure :D
Gary
20-10-2009, 04:21 PM
The oils will be the same, i think R404A is R507 with a bit of R134a mixed in. R404A txv's are marked up to work with R507 as well. So my money would be on ok, but i don't know for sure :D

Exactly so. The two refrigerants are almost identical.
NoNickName
20-10-2009, 04:29 PM
Confirmed.
Sandro Baptista
20-10-2009, 05:38 PM
No problems. The properties of this gas mix will be in the middle of R507 and R404A, and this two blends have almost the same composition and properties.
Clk320_Greg
20-10-2009, 05:57 PM
Phew!

Thanks very much for so many good replies!