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View Full Version : Change over from R 502 to R 404A



smpsmp45
03-04-2008, 06:50 AM
There are lots of units operating on R 502. Now everybody wants to change over to R 404A. What are the precautions to be taken?

Has anyone done this?

paul_h
03-04-2008, 07:52 AM
different oil, and r404a is a r134a blend (3%), r507, without the r134a seems is better.
You could of just done a search, it's not like r404a is new. ie.
http://www.refrigeration-engineer.com/forums/search.php?searchid=451099
search _>advanced_>r404a only in the title_>refrigeration and sub fourms only

powell
03-04-2008, 02:31 PM
Here's a link to Copelands R502 to R404A changeover procedures.

http://www.hvacrinfo.com/cope_ae_bulletins/94-15.PDF

smpsmp45
04-04-2008, 07:15 AM
Hi! Powell,

Excellent link. Many thanks