Are you talking about the fan control temperature on/off settings or high limit temperature setting?carlherrnstein wrote: Does anyone know what the off and on temperatures are or what is a suitable replacement switch.
Combustioneer 77B
- rockwood
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- McGiever
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High Limit wants to open circuit upon reaching up to 200*F.
Fan Switch goes on at ~175* and goes off after cooling back to 150*F.
Fan Switch goes on at ~175* and goes off after cooling back to 150*F.
- rockwood
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Based on my experience with these furnaces, a fan on temp setting in the 140-150 range and fan off setting in the 110-120 range works well.
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Sorry for the delay, the people at Will Burt say that the high limit for this unit is 400*F. I took it off and placed it in the oven and confirmed that it opens at 450*F which seems reasonable to me. This limit switch looks a lot like the temperature control switch for a lee lead melting pot.
I have the fan limit set at the factory setting.
I have the fan limit set at the factory setting.
I'm not a fan of that as a high limit. One of the reasons you see so many combustioneers with sagging tubes and heat exchangers is because of such a high limit when the feed/air is adjusted improperly. I'd prefer to see 350 max on a heat exchanger snap switch or 200 on a combination switch.