I was working on a yorkrooftop unit last week and the breaker in the disconnect (100amp 3 phase commander breaker) was no good, i had proper voltage at line side and missing 1 leg of 3 phase on load side, the unit ran for a week and now today i went back and had the same problem, is there somthing in the unit that would take out this breaker??? overamperage? improper voltages? any suggestions?
This should be in the tech forum.
Mod number of unit.
What is the voltage to the breaker when the unit isn't running.
What is the voltage to the line side of the breaker when the unit is running.
What is the voltage on the load side when the unit is running.
Did you check for voltage imbalance.
Did you check amp draw on it.