Moved into a 30 yr old house with a forced gas hot air heating system.
Saw something near the furnace wiring which I'm not familiar with.
Seems like they have a regular 4 inch square type gang box mounted in very close proximity to the furnace with what looks like a threaded rod/stud hanging downward from, with a round wheel on the hanging stud.
Is this a thermal safety shutoff ?
Who manufacturers them, and what are they "officially" called or termed ?
If so, how does it work; is it likely for the 110 V power feeding the furnace ?
Would there be any possibility that if this is the purpose, they might have it wired into the chained together smoke detectors for an indication if it is ever tripped ? Did they ever do this type of scheme with smoke detectors way back, possibly ?