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Posted by M Q on January 31, 2007, 10:04 am
paulo404a@gmail.com wrote:
> I got a programmable thermostat to replace a pretty simple Honeywell
> one that came with my house.
>
> The instructions on the new programmable thermostat warned that it
> would not work with a 2 stage furnace. I even called their tech
> support
> and they confirmed that.
>
> After some investigation I found out I have a Carrier 58UXT, and that
> it
> is a 2 stage furnace.
>
> I went though the trouble of ordering a 2 stage programmable
> thermostat
> and hired a technician to install it. I looked at the his installation
> and
> realized it is connected exactly as the old thermostat was, just using
> 4 wires (red, yellow, white and green). He had nothing connected to
> the
> W2 pin. As far as I could understand that was the difference for the 2
> stage
> furnace. There are 2 other wires (blue and tan) that are disconnected.
>
> Does anyone know what those other 2 wires (blue and tan) are for?
> Can any of those be the for W2 connection?
>
> Would the unit not work as it should because of that installation?
>
> Can I just use the 1 stage thermostat instead since the wiring
> looks the same? I like it better because it has a remote control.
>
> Thanks in advance for any help.
>
> Paulo
>
Don't go by the wire color. There is no standard wire color scheme
for thermostats. Look at what the wires are connected to and look
at the installation instructions for the thermostat and furnace.
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