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1146 Fan Limit Switch - Heating - Electric Furnaces
 
1146 Fan Limit Switch - Heating - Electric Furnaces -

Image Text: Hot air plenum > 25 kw electric furnace > electrical supply > blower > cold air return > temperature probe > cover > manual fan switch > fan ON - typically 125 degrees Fahrenheit > high limit - typically 200 degrees Fahrenheit > the fan may be set to come on at the same time as the elements or may have a slight delay (e.g. when plenum temperature reaches 125 degrees Fahrenheit) so that cold air is not blown through the ducts initially > the fan turns off when the elements turn off

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