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-   -   Programmable Thermostat to Furnace Wiring (http://www.diychatroom.com/f17/programmable-thermostat-furnace-wiring-76113/)

JeremyB 07-13-2010 10:56 PM

Programmable Thermostat to Furnace Wiring
 
I recently upgraded my thermostat to a Honeywell RTH7500D. My furnace is a Lennox G50UH. I only have two wires attached to my thermostat: W and R. Everything works fine, but am I missing out on some functionality or efficiency with only these two connections? Thanks.

Marty S. 07-14-2010 06:05 PM

Missing the ability to turn on the blower independantly. Other then that it's a single stage furnce so it's either on or off. Run another wire from the thermostat G terminal to the furnace G terminal if you want the on/auto fan function to work.


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