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-   -   Wiring new Thermostat to new furnace (http://www.diychatroom.com/f17/wiring-new-thermostat-new-furnace-31590/)

hartkem 11-10-2008 06:40 PM

Wiring new Thermostat to new furnace
 
Hello, I installed a new trane xr90 furnace and would like some help wiring the thermostat. I dont want to short out the board or anything. My furnace has the following connections. C, G, R, W, & Y. I am hooking that to a RTH7000 Honeywell programable thermostat. I will only be using Single stage heat for now but airconditiong in the future. I bought a five conducter themostat wire with G R W Y and Blue. There wasnt a blue on the furnace. Do I just need to hook up G, R W & Y to their prospective spots. Do I need the C terminal and what is it used for? Thanks for all your help.

chris75 11-10-2008 07:53 PM

Quote:

Originally Posted by hartkem (Post 182968)
Hello, I installed a new trane xr90 furnace and would like some help wiring the thermostat. I dont want to short out the board or anything. My furnace has the following connections. C, G, R, W, & Y. I am hooking that to a RTH7000 Honeywell programable thermostat. I will only be using Single stage heat for now but airconditiong in the future. I bought a five conducter themostat wire with G R W Y and Blue. There wasnt a blue on the furnace. Do I just need to hook up G, R W & Y to their prospective spots. Do I need the C terminal and what is it used for? Thanks for all your help.


C is common, if your t-stat has that on it, than you can use it. not sure if your t-stat requires it or not. some do, some dont.

hartkem 11-10-2008 08:17 PM

Thanks, I just hooked everything up by color and it worked. Why do they use a jumper from RR to R on the stat

hvaclover 11-10-2008 08:25 PM

Quote:

Originally Posted by hartkem (Post 182999)
Thanks, I just hooked everything up by color and it worked. Why do they use a jumper from RR to R on the stat

If it's got a C (common) you'll need to power the stat. It runs of the furnace xfrm (transformer)

chris75 11-10-2008 09:11 PM

Quote:

Originally Posted by hartkem (Post 182999)
Thanks, I just hooked everything up by color and it worked. Why do they use a jumper from RR to R on the stat

You mean RC and RH? incase you have a dual transformers, one for heating, one for cooling.

hartkem 11-11-2008 07:24 AM

Ok, that makes sense. All is working ok. Thanks

dac122 11-11-2008 09:48 AM

Quote:

Originally Posted by chris75 (Post 183031)
You mean RC and RH? incase you have a dual transformers, one for heating, one for cooling.

... and because most setups use just one transfomer the tstats often come jumpered from the factory.

chris75 11-11-2008 07:09 PM

Quote:

Originally Posted by dac122 (Post 183242)
... and because most setups use just one transfomer the tstats often come jumpered from the factory.

Thanks for the extra explanation. :thumbsup:


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