Typical 404a Freezer Pressures

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Typical 404a Freezer Pressures

Thread: Normal Freezer Pressures … I just wanted to know what are normal pressures for freezers. Its 404 … Dont have the guagues for 404A.
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).
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 …
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 …
In order to have the coolers temp at 34. While the system is running, the refrigerant temp in the evap would generally be at 24, so 32 suction pressure while running. The liquid line pressure would also need to be higher then the saturation temp of the outdoor ambient, so liquid line pressure would be at least 254.

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