Air Conditioning/Thermostat Selection

Posted by randallbrink on May 16, 2008, 9:23 pm

I have a puzzling problem. When I select "Cool" on my thermostat, the
central fan does not come on, and so, while the air conditioner
outside runs, it quickly freezes, as there is no air movement. On the
other hand, if I select the heat-cool switch to "Off" and turn the fan
"On" the fan works fine. But if while the fan is running, I move the
Heat-Cool switch to "Cool" the fan shuts off. I have replace the
thermostat, and have the same problem.

Any help will be greatly appreciated, as the outdoor temperature is
now 90F.

Posted by Telstra on May 16, 2008, 10:03 pm

POST the make and model # of thermostat

>I have a puzzling problem. When I select "Cool" on my thermostat, the
> central fan does not come on, and so, while the air conditioner
> outside runs, it quickly freezes, as there is no air movement. On the
> other hand, if I select the heat-cool switch to "Off" and turn the fan
> "On" the fan works fine. But if while the fan is running, I move the
> Heat-Cool switch to "Cool" the fan shuts off. I have replace the
> thermostat, and have the same problem.
> Any help will be greatly appreciated, as the outdoor temperature is
> now 90F.
>

Posted by randallbrink on May 17, 2008, 8:33 am

> POST the make and model # of thermostat

> >I have a puzzling problem. =A0When I select "Cool" on my thermostat, the
> > central fan does not come on, and so, while the air conditioner
> > outside runs, it quickly freezes, as there is no air movement. =A0On the=

> > other hand, if I select the heat-cool switch to "Off" and turn the fan
> > "On" the fan works fine. But if while the fan is running, I move the
> > Heat-Cool switch to "Cool" the fan shuts off. =A0I have replace the
> > thermostat, and have the same problem.
> > Any help will be greatly appreciated, as the outdoor temperature is
> > now 90F.

The first was an AprilAire 8363, the new one a Honeywell T87N

Posted by Telstra on May 16, 2008, 10:04 pm

POST the make and model of the Air conditioner

Posted by Nate Nagel on May 16, 2008, 10:13 pm

randallbrink wrote:

> I have a puzzling problem. When I select "Cool" on my thermostat, the
> central fan does not come on, and so, while the air conditioner
> outside runs, it quickly freezes, as there is no air movement. On the
> other hand, if I select the heat-cool switch to "Off" and turn the fan
> "On" the fan works fine. But if while the fan is running, I move the
> Heat-Cool switch to "Cool" the fan shuts off. I have replace the
> thermostat, and have the same problem.
>
> Any help will be greatly appreciated, as the outdoor temperature is
> now 90F.
>
>

Is your thermostat such that you can access the wires connected to it
while it is operational? you ought to slap a meter on there and figure
out if the issue is with the thermostat not commanding the fan to be on
or if it's in the furnace. If your furnace is like mine, the fan is
controlled at different speeds for each of heat, cool, and manual fan on
- so at least in my case, if I were having your problem I'd be digging
into the control board for the furnace not the thermostat. If however
you have a single speed fan, it would likely be the thermostat. Which
kind of setup do you have?

good luck

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel

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