Original message
| kilowatt
|  "superheat"
, posted Mon 19 Jun 23:53  
working on low temp walk-in freezer, ran on ref.- 502 changed to 404a drop in ref./ left same 502 expansion valve, having problem , temperature will not drop below 18 degrees farh.
lorenzopower
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Replies:
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| beginner
| "Re(1):superheat" , posted Tue 20 Jun 10:50:
How about some more info? ie: SH, low and high side readings, SC.
Did you change the lubricant to POE? 404a uses POE. 502 uses mineral
[this message was edited by beginner on Tue 20 Jun 10:54] |
| | fitter597
| "Re(2):superheat" , posted Tue 20 Jun 17:03:
404A is not a drop in for 502, what you want is 408A. If you put 404A in the system and ran it you will need to change the oil and add new driers to the system.
LOCAL 597 PIPEFITTERS
"We Do It Right The First Time"
[this message was edited by fitter597 on Tue 20 Jun 17:18] |
| | ben2cool
| "Re(3):superheat" , posted Thu 10 Aug 21:47
If you do NOT Know, Call a professional Refrigeration contractor, not a plumber, electrican, appliance repair guy, or a furnace installer.
The fun continues **Hire Me** SW British Columbia
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