refrigeration pressures

[richyrich]

I recently acquired a used commercial 3 door Sub Zero freezer with a Copeland 404A compressor. What refrigerant pressures should I expect to see during start-up.

Thanks

[rayr]

Almost the same as 502

[Mod2]

I deleted your double post, you had this thread also posted in the resi section. Forum Rules (http://hvac-talk.com/vbb/showthread.php?threadid=1241)

[dhjenkins]

You can download a utility direct from the copeland website that can tell you pressures, temps, amp draw, operating envelope, etc... for any copeland compressor & and it's corresponding refrigerant(s)

https://opi.copeland-corp.com/documents/clc/SetupCpCalcFull.EXE

You may have to form a quick account to access it.


EDIT: The utility does not (yet) include alternate refrigerants.

[condenseddave]

Yeah, real close to 502. Not as close as 408 is, but pretty damn close.

[richyrich]

Thanks for your responses, bottem lin is that I emptied the system and weighed in 19 oz. of r 404 a (almost the same as 502 ) as per the instructions on the door for total charge.... End results.... Low pressure 10 psi.... high 190 psi frezzer temp -03 f Every things fine Thanks Rich