beverage cooler evaporator freeze up problem

[2sac]

I get it. They built a ceiling around the condenser section. In answer to your question. Yes. I've seen criticaly charged cap tube systems drop to 10psi at startup, raise to 17-22 as the box cooled down and drop even lower as box hits temp. With no nameplate you'll have to charge by superheat. The other variable you do not know is if the last guy or last two guys put their guages on the system.

[Capz]

I'd want to know what the ambient temp is near the condenser and what your head psi reads while you are seeing 5-10 psi suction pressure before determining that I had a clogged cap tube. How old is this system? Was it always R134?

[TempcoDog]

From what they said nobody has touched the system since the new compressor/ condensing unit was installed 4 or so months ago. Yes it's always been 134a. Ambient was around 60f round condenser.
So I need to system run awhile and see what suction pressure will do?
Appreciate your guys insight and have more to go on now when I return tomorrow

[2sac]

60* ambient? Therin lies your problem.

[MicahWes]

Yeah, at 60 ambient, 10psig suction on 134A is to be expected.

[TempcoDog]

So I went back and changed the cold control from the original one to a habco. Superheat was ill high at 20-22 but supply temp was 35f and system shut off at 35-36 and back on at 40-42 ish. Running good. Apparently this is the second condensing unit they've gone through with the original evap. Low budget but working for them
Thanks again for all your insight

[VTP99]

My thought was the guy that installed the condensing unit 4 months ago was probably charging it when there was a much higher ambient.