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Thread: 404a high pressure?
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29-11-2007, 05:48 PM #1
404a high pressure?
what would you consider a "too high" pressure for a medium temp unit using 404a?
the pressures im working with are 65psig and 325psig with an ambient temp of 70f. the liquid line is hot (around 115f), the superheat is a tad under 30 but the unit is still coming down to temp.
i built this cooler (a small, glass door wine cooler) from scratch and it has a new condensing unit (404a, med temp 1/4 hp) and im just not sure if i got the charge right.
i discovered a small leak at one of my flare fittings and repaired that then this morning i pumped it down and pulled a 200 micron vacuum and refilled it with 10 oz of liquid. i slowly brought the charge up by 1/2 oz at a time up to 12.5 oz. them air temp at the evap coil was coming down slowly (46f) last i checked.
this box is less than 20 cubic feet and i think the temp should be dropping alot faster considering the size of the condensing unit.
also,,, there is a new txv and drier installed.
any suggestions will be appreciated,
thanks,
mike
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