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I was on a start up recently where we came across unstabile superheat.
The system is a vav system. four stages of cooling. Glasses clear, suction pressure only flucuating a pound or two. Freq drive condenser fans. We saw the superheat flucuate from 4 deg to 20 deg in 30 secs and back the other way.
We checked everything, bulbs in the proper place tight no oxidation on pipe. etc. any adjustment tried made no change. Spoke to sporlan valves are ove15 4 valves on system. They had no answer other then to play with the valves.
I thought that the problem could be caused by too high of an air velocity across the coil. We were told system was air balanced. Boxes were open and main freq drive was in auto control. So that about rules that thought out.
Does anybody have any ideas??