why do you say that it is flooding to the compressor? Because the manitowoc compressors on the qy machines always have frost through the freeze cycle going to the compressor especial toward the end of the freeze. The key to the refrigerant pressures on the Qy machines is at the very end of the harvest cycle if it ever so slightly different from the book there is a problem. From your info about the sheets not falling off as long as the nickel is still on the evaps I would look into the cool vapor solenoid valves not opening all the way.
his harvest pressures were on point ... it does seem like a release issue though.
if your not equal to or above 150° DLT at the end of freeze cycle your low on charge. . add that to the bad evap you will have release issues due to the obvious. evap at least free of mineral build up? ... id say download the analysis chart but with that evap is it even a legit procedure?
Lol thats funny "is it even legit?" I agree, its probably not!
Personally, I think about it like this: low discharge line temp on this type of ice machine is probably one of three things, 1 - low on charge, 2 - compressor issue, or 3. overfeeding txv. Of those 3 choices, which one causes the top of the compressor to freeze up!!!???!!! Heck it might be an overcharge. That's why its a good idea to weigh in the charge first.
Could the superheat need to be adjusted? If work was done on the machine in the past, I wouldn't take anything for granted as far as charge, valve settings, superheat, etc. I see a lot of "weigh in the charge" comments, and while that is always the correct thing to do, that doesn't alleviate the need to check other factors.
yanno ... i think myself & OP are wrong on the DLT @ EOF needing to be 150° or greater.. isn't it 160 on Q models? ... for some reason this just popped in my head but i haven't worked on a traditional Q remote in a while ..... so the 143° he's having would be something to check. .... if its constant 143° @ EOF each time you need to get the charge right. if not lean towards expansion valves checkout including checking bulb mount, insulation blah blah .... or junk that p.o.s. machine lol
Thanks everyone. Went back this morning and pulled the charge. System calls for 15 lbs. Hit 15 and kept going and going. System was over charged by 6 lbs. Weighed it back in and restarted unit. This time floodback not as bad but compressor still getting liquid back. Told the customer that the txv would need to be replaced and and the evap. He took it quite well and askded for a quote for repair and a quote for new. I hope he makes the right choice.
Just wanted to thank everyone. And I did check delta t across the evap.
You really should try to replace it. I do not believe replacing the valve will solve the flooding. The main problem is that Evaporator. Replacing one part when another is obviously bad is a bad use of customer money. You need to be honest with the customer that spending any money on that machine is the wrong decision. I would not even provide a quote for repair. Hopefully you have a good professional relationship and he will respect your input.