2012年5月8日 · R404 is a better A/C refrigerant because of the lower temps but works like R410 in heating. The discharge temps are lower than the normal for what an R22 system would see. …

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2014年6月6日 · yeah, That's why I'm throwing this out there. I was thinking maybe with the low temp. that a swing to the minimum 3 deg. S.H. might be o.k.

2021年7月6日 · I’m n ac guy trying to help a buddy with walk in with r404. Can only get 20 degrees super heat liquid temp 112. 305 psi. Suc 50 psi. This is a new start up Txv is open all …

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2011年6月24日 · i am dealing with a walk in freezer temp is 40 degree in box no lower sight glass is clear running 20psi on suction and 325psi on head pressure evap sh is 56 100 degree …

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2007年7月2日 · compressor is a 3RA1-0310-TAC AT 20/120 33300 BTU listed with r502, COMPARED TO 25800 BTU WITH R22. THE DELI CASES REQUIRE 26000 BTU.

2006年3月14日 · 404A runs a higher head. In my neck of the woods, 404A costs alot more than 134A. Cap tube restrictions in my opinion are from the oil and high head pressure and high …

2014年7月6日 · I am a Journeyman, but I strictly work on residential units. Never had to work on a 404a system. A friend of mine had me check out a reach in freezer at his restaurant.