I have a Manitowoc QY1094N remote. On the original call (about 45 outdoor ambient)a few weeks ago, it was flashing a 2 code - 3 consecutive harvest over 3.5 minutes. It would make a perfect sheet in about 10 minutes, and then would not drop the sheet. It was loose on the lower half tho. Pressures during freeze were perfect, by the book. In harvest, low side was about 80# (book calls for 65 to 90). High side was about 155#, considerably lower than the book (180+).
I figured if I had 80, sometimes 83#, I had the heat to drop the sheet. Didn't happen. I ran it through a clean cycle with Nicklesafe. Nothing. I called my distributor, who is usually very good. All they do is Manitowoc. He was stumped and had me call the factory. I called and left the job, waiting for them to call back.
Manitowoc called back and suggested I had scale on the evap. He told me to dry the plate and look at it then. OK, did that, cleaned the plate with a soft bristle brush as suggested - nothing. Recovered the charge - I was missing 4#, and I figured I solved the problem. Nope. Same pressures in freeze & harvest - no change. Same outdoor ambient.
Called the distributor again. He had me connect to the receiver and dump gas into the low side in harvest. Brought low side to 90# and the sheet dropped easily in 2.5 mins. Hmm.. maybe a bad HPR valve. But the book says harvest pressure is 65 -90#. And the HPR is giving me 80-83#. What's a new HPR gonna get me?
That's the question. Should I find an adjustable valve so I can get 90#? Any other ideas?