Bob, You may be right. It seems like an expensive over kill. I still don't know much about how they work. I think this motor had a built in delay on off timer built in.
Another strange thing was the relays all had circuit boards that converted the 24 vac control voltage to 22 VDC. Don't have a clue why, but it stands to reason that if the motor is a DC motor, that the controls are also DC. I tend to think, the 24 vac was sent to the motor to turn it on, like the motor control, built in to the motor, acted like a built in relay.
Never worked on too many electric furnaces. This furnace reminded me of how things have advanced in 45 years. George
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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