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Posted by Zyp on November 21, 2007, 3:26 pm
HVAC Guy wrote:
> Ken wrote:
>
>> Our furnace blower stops before the set temperature is reached.
>> Got a brand new thermostat and the same things happens. It will
>> not restart until the Heat/Cool/Off control on the thermostat
>> is placed in "Off" and then placed on "Heat", even if the
>> temperture drops well below the set temperature. What need
>> to be changed?
>
> How old is your furnace?
>
> Look on this page:
>
> http://toad.net/~jsmeenen/anticipator.html
>
> There are 2 pictures. The second one is a picture of a thermostat
> (the furnace fan-control thermostat) that's mounted to the heat
> exchanger inside a furnace (in this picture the cover was removed from
> the thermostat). Do you this on your furnace?
>
> The round plate with a slot in it rotates based on the temperature
> inside the heat exchanger. It's what turns your furnace fan on and
> off, and also has the hi-limit switch.
>
> Your problem could be that your fan is cooling down your heat
> exchanger to the point that your fan is turned off even if your
> burners are still going. This could be caused by an incorrect Fan-Off
> setting, or maybe you need a new furnace fan-control thermostat.
>
> Alternatively, you could be hitting the hi-limit, which means that the
> temperature inside the heat exchanger has reached the hi-limit setting
> of the fan-control thermostat. When this happens, the burners are
> shut off, but the fan will (or should) keep running until it reaches
> the Fan-Off setting.
>
> What you should do next is go and watch your furnace (take the front
> cover panel off) and see if your fan turns off while the burners are
> still on, or if the burners turn off (but the fan is still running).
You're so fucking funny HVAC Gay Guy! Why don't you try giving tips on
fixing cars? You just as good at that as you are an HVAC engineer.
--
Zyp
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