5HP Low Temperature Scroll Compressor for Refrigeration Meat Fish Quick
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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. He said it seams to always be in defrost. I checked out the system after defrost, and it is freezing far to quickly. It seems like it may be low on refrigerant but I have no idea what the operating pressures are suppose to be.. R-404A Pressure Chart.. ice machines, refrigerated transport, and industrial refrigerant systems. Starting in 1996, 404A was the primary refrigerant for the above mentioned applications for over twenty years. R-404A is non toxic and non flammable and has an A1 rating from ASHRAE. Note that if 404A is pressurized after being mixed with air.
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At the high end, the pressure of 404A is 456.8 psig. We are, of course, talking about 404A liquid pressure. Example: What is the pressure of R404A at 85°F? Just check the R404A PT chart below and you will see that the pressure of 404A liquid at 85°F is 189.5 psig and the pressure of 404A vapor is 187.5 psig at the same temperature.. Ice Machine Service Handbook for products introduced 2007 and later Revised: August 2016 291-840.. Refrigerant charge, oz R-404A 17 Fan pressure sw ., cut out / cut in, PSIG 190 / 240 High pressure cut out / cut in, PSIG 500 / 390 Compressor Amps, beg . - end, freeze 7 .9-6 .5
