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Posted by Jimi on December 11, 2006, 9:08 pm
> wrote:
>
>>
>>>
>>> Hi,
>>>
>>> I've got a new Heil 1-stage upflow furnace (installed last Apr.) in
>>> my little brick bungalow in the midwest.
>>>
>>> The heat cycle is something like:
>>>
>>> T-stat calls for heat
>>> LIttle fan sucks fumes out.
>>> Heat element gets power.
>>> Gas valve opens, burners fire
>>> Blower kicks in
>>> Gas valve closes
>>> Blower kicks out
>>>
>>> Occasionally and only intermittently, after the heat cycle
>>> has been complete for some time, the blower will run for
>>> about 10 seconds and then shut down.
>>
>> The furnace fan is designed to kick in when the heat exchanger reaches
>> a
>>certain temperature. What is happening in your case is the fan is not
>>running long enough to cool the heat exchanger after the heat cycle. The
>>residual heat in th exchanger tells your fan to kick back in to cool it
>>down
>>for those 10 or so seconds. You have to set the fan to run longer after
>>the
>>heat cycle and this will prevent the fan from kicking back in. There is an
>>adjustment in the furnace.
>
> I think you've nailed it.
> Much Thanks,
> Puddin'
Glad I was able to help. I had a furnace guy show me the same thing during
a yearly check up as I was having the same problem.....Jimi
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