furnace stops long before blower starts


Old 01-02-09, 08:17 AM
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Post furnace stops long before blower starts

Luxaire furnaceabout 30 years old, termostat set to low temp, 50 degrees, furnace always stops first before blower starts, fan limit set at 70, 100, 200 degrees, limit is been replaced, out of the box settings were 90, 140, 200 degrees, at this settings the same would happen but the gap between furnace stoping and fan starting was much greater, fan would start up to 45 seconds if not more after furnace stoped working, with new limits the gap is down to less than 10 seconds, is this normal or not, to me is like wasting heat becaouse fan only operates after furnace turns off.
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Old 01-02-09, 12:14 PM
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What type of fan/limit control do you have? A honeywell or camstat. Some of these have a timer built into them that brings the blower on at a set time. This is initiated with the call for heat by 24 volts to the timer. If it has a timer will also have six wires going to it.

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