Hey guys,
Have had a freezer unit with a Copeland scroll compressor tripping on thermal overload. The freezer is a built in 2 door freezer with an external condensing unit running on R404A. When I first got out to the unit I found the compressor out on thermal overload, I let it reset, found
High side temp = 36-38c
Lowside temp = -25 to -30c the closer the freezer got to setpoint of -22 then suction temp would reach -30c.
suction line temperature approx 30cm from compressor = 8-10c.
so total suction line superheat approx 38-40k at setpoint.

I slightly adjusted the tx valve open a few times lowering the superheat. I left it at approx 14-20k total line superheat


I was just wondering your guys thoughts on what is the lowest you believe you can go with your 'total suction line superheat' without chance of liquid floodback.

would really appreciate feedback from some of the refrigeration/freezer guru's out there. Thankyou