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I would check for blower running wrong direction and/or blower wheel installed wrong. Check amps and static pressure.

Forget about the sight glass and use your charging chart.

Lowering the static shouldn't help. The vav will only compensate to maintain cfm min/max. Sounds like you have too much airflow/cooling for the heat load. Is the space occupied or vacant? Was an...

I have noticed that the ICOM controls do things that tech support can't explain. The software guys make changes and I guess don't tell anyone.

Here we go, computer geeks think they know what's best.

5amps seems a little low for a 5ton system. Bad compressor with dirty condenser coil or non-condensables in the system.

Any rule of thumb on which voltage to do a test. Our megger at work has selectable voltages of 500,1000,2500,and 5000 to test with.