I live in a pretty hot area (during the summer) and have been in the attic a couple of times now to inspect the two gable attic fans that are installed on either end of the house. The fans are pretty old-school. Emerson Electric K55 models, both identical. (See the pics)
I've traced the wiring from the fan all the way back to the circuit breaker and there is no thermostat installed. However, there is a silver component on the rear of each attic fan that I suspect might be the thermostat. The attic fans are older, so I can't find any documentation for them online.
Can anyone tell me
1) is that silver component the thermostat?
2) are there places online where I can find documentation for these things?
3) what's the best way to test if the fans actually run?
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looks like a close on a rise snap disk and yes if that is what it is it is most likely acting as a thermostat. don't know where to find info on that fan. I have personally seen one. What is the temp in the attic? It should run the fan i would think if above 110/120 degrees. a hair dryer should be able to put enough heat on the snap disk to bring it on if everything is working.
I checked out snap disks and it does look very similar to what is on the fan right now. After it cools down a bit I'll head up there and do some poking around again. Maybe even the candle technique will be given a try. The temp up there is hot. Definitely feels over 110, but I haven't measured with a thermometer yet. Will let you know what I find!