I am well into my 2nd season of heating with my homemade OWB, and very happy with it.
When I built it I put a 190 degree snap disc limit switch in the fan circuit. I either put it in the wrong spot (where it is "seeing" a heat hotter than my aquastat) or it is kicking out at a lower temp (defective), and kicking the fan out at too low a temp, so I took it out of the circuit within days of firing up the unit last year and have been running without a dedicated high limit.
I am using the common Ranco aquastat for my fan control now and was wondering...can I use another identical ranco aquastat for a high limit switch on the fan, just in case the first aquasat malfunctioned?
And if so, how would I wire it in?
Or is there another way to have a high limit switch on the fan that would be better?