is or is not the the box temps going to be Ok when the compressor super heat is dead nuts?? and whats the most costly item in a system? and what can be ruined if the compressor super heat is right?? and why is there a sticker on the side of a compressor that calls out a temp for compressor super heat??
Yes, compressor superheat is crucial. With a minimum of 20* your compressor is safe from flood back. As for the evaporator it is also crucial to have the correct superheat. Freezers are typically set for 4-6 degrees were as coolers range from 8-10. If the range is not within spec. you could be over or under feeding the coil. At the compressor the superheat might be ok due to heat picked up thru the suction line run.