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Posted by Zyp on February 19, 2008, 11:45 am
Tony Hwang wrote:
> Nate Nagel wrote:
>> Don Wiss wrote:
>>
>>> wrote:
>>>> mr. spam wrote:
>>>
>>>
>>>
>>>>> I want to replace the fan motor with a 2 speed one
>>>>>
>>>>> i want to add a switch to the furnace so i can have the fan on all
>>>>> the time in slow speed. then when the burner or the ac comes on
>>>>> it will change to high speed.
>>>
>>>
>>>
>>>> I think many (most? all?) furnace/AC combinations already
>>>> incorporate dual speed fans. Are you sure it doesn't already have
>>>> the capability you seek? You might just need an appropriate
>>>> thermostat.
>>>
>>>
>>>
>>> I believe you are correct. The heat uses the low speed and the AC
>>> the high
>>> one.
>>>
>>> Don <www.donwiss.com> (e-mail link at home page bottom).
>>
>>
>> Actually mine has several speeds, not sure how many. only three can
>> be controlled from the thermostat however. By moving wires around
>> on the circuit board you can change which speeds are used for which
>> events. I think the way it is set up now, if you command the fan
>> "on" from the thermostat, it runs at a low speed, in "heat" mode it
>> runs at a medium-high speed, and on A/C it runs at the highest speed.
>>
>> I have on occasion found it useful to command the fan on even when
>> the furnace is not running, e.g. if someone is doing a lot of
>> cooking in the kitchen on a cold day it can be cold upstairs because
>> the thermostat is on the first floor, keeping the air circulating
>> not only cools the kitchen but tends to even out the temperature
>> throughout the house. I've also completely closed the supply dampers on
>> the first floor,
>> but that's primarily because of the dramatic difference in insulating
>> properties between the first floor (block walls with brick facing)
>> and the second floor (sticks 'n' shingles) - I do plan to have the
>> second floor insulated but not until I'm done fixing all the wiring.
>>
>> Anyway back to the topic at hand... it sounds like the OP does need a
>> new thermostat, and probably also needs to pull a new cable between
>> the thermostat and furnace to allow for more functions. (typical
>> heat only scenario would only require two wires, but heat/cool/fan
>> only would require at least four.)
>>
>> nate
>>
> Hmmm,
> My impression is OP has a OLD furnace which does not have multi-speed
> fan and or elaborate electronics control board.
LOL
--
Zyp
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