Operating Pressures For 404a Freezer

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Operating Pressures For 404a Freezer

I just wanted to know what are normal pressures for freezers. Its 404 … Dont have the guagues for 404A. … speaking, the evap needs a solid column of liquid to the TXV as well as a properly operating TXV in order to do its job.
SOURCE: normal operating pressures. Normal operating pressures will change as the freezer reaches the selected temperatures on the inside.

Physical Properties of Refrigerants. Environmental Classification. Molecular Weight. Boiling Point (1 atm, ˚F). Critical Pressure (psia). Critical Temperature (˚F).
R134A runs at 0psi on the low side and 404A runs at 55psi. Doesn’t matter what machine you have, that’s the pressure they should be running …
30 suction pressure is definitely a bit high. It should be running at 10-20psig (10 is ideal) on the suction side if working properly. And the high …
I adjust evap superheat to 4-6 degrees on typical walk in freezers, and like to see 20-40 at the compressor, and around 10 degree subcooling at inlet of metering device.

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