Jimi wrote:

I have two forced air furnaces...I have a gas one in the house, and an
old oil burner I use to heat my shop in the backyard. The other day I was
close to my gas furnace in the house and heard some squeaking as the fan was
turning. On inspection I found that the allan screws had become loose
holding down the drive pulley and the pulleys had become out of alignment
causing the belt to squeak. It was a simple fix, tap the pulley back in
place and tighten the screws.
This brings to mind a question. If the furnace threw a belt during it's
heating cycle, would it not crater the heat exchanger? Like...there is no
air going through it, and the motor would be still running so the furnace
would think everything is fine, right? Is there a thermostat to kick the
burners off in the event the heat exchanger reaches a critical temperature
in case something like this happens? Thanks for any replies...Jim


Yes, there is a high temp limit switch that will open the circuit to the
gas valve or oil burner.
http://www.udarrell.com/oil_furnace_heating.html - udarrell

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