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Testing Electric Heat – A Cautionary Tale
Travel back in time with me to 2001. I was a young tech, proving my salt out there in the big world of commercial RTU maintenance. One of the steps in the Fall PM list was “test aux heat,” and by golly, that's what I was going to do!
I was on the roof of a bank, and I began testing the heat strips one unit at a time. Sure, I smelled a little something, but that's normal, right?
I turned around to see the bank manager frantically scrambling up my ladder onto the roof.
Now, I have seen many bank managers in my day, and this sort of athletic feat was not usual. “THERE IS SMOKE EVERYWHERE! AND THE ALARM IS GOING OFF!” he gasped.
So, the fire trucks arrived, and my father also chose to visit that same branch at that exact moment. He looked around and asked, “What's going on here?”
Oh, nothing much, Dad. I wouldn't go in the bank, though. It's a little stinky in there.
So, I learned my lesson. Sometimes just “burning off” the heat isn't the best bet. If the heat hasn't run much, it would be wiser to remove the strips and blow them off with nitrogen or compressed air before you turn them on.
Unless you like watching bank managers do gymnastics.