Ok I picked this unit up a while ago and have done some research on the issue. It seems to cycle a lot, comes on for about a minute, then turned off for about a minute and a half then repeated. From researching it a little it said it could have been under charged.
My neighbor does commercial HVAC but not refrigeration but said he would look at it. He determined that the coil or compressor was getting too hot and that's why it kept turning off (a safety precaution) and it probably had a low charge, so he cut one of the copper tubes, evaporated the unit (he said there was probably more refrigerant in his hoses and gauge than in the unit) and brazed on a shrader valve, he then pressure tested it with Nitrogen and said it held pressure for almost an hour so didnt think there was a leak.
The unit called for 7.5oz of 134A so he told me to get the smallest can that I could so I went to the auto parts store and picked up a 14 oz can. Thats where we got into some issues, his hoses wouldnt pierce the can, and the valve that I got at the store that would pierce the can had 1/2" ACME threads that didnt match his Yellow Jacket hoses. He tried Brazing a valve to it but the valve apparently wasnt brass (he said it was a painted white metal and almost melted completely) so in a act of almost desperation we just used some of the quick steel epoxy putty to seal the a valve he could attach to on to the valve that came with the can. We put in the 134A and it "drank" a lot of it.
It seems like it ran so much better that night. The compressor stayed on for quite a while and it dropped temp down to about 44 degrees (the unit had been unplugged for about 4 days while we were gathering materials and so on) Two days later it seems like it is cycling a lot again and it doenst get any colder than 42-44 degrees, even at the coldest setting (or at 5, its the same temp)
I used a laser temp probe and the coil on the front isnt getting much hotter than 95ish and the compressor itself is getting up to 110.
Any thoughts?? trouble is a lot of people I called didnt want to work on it because it was in a residential location (I use it for my home brew beer) and the res guys didnt want to touch it because it is a commercial unit.