02:25PM | 01/31/05
Member Since: 01/30/05
2 lifetime posts
Hi, i have recently purchased and tried to install a New Touchscreen Thermostat. I tried to follow and label and correctly wire the thermostat to my furnace and A/C but it seems i have not done it right. I can get the heat to work, but when i switch to AC, there is only regular coming out, like the compressor is not turned on or something. I tried to look at the terminals on the furnace and old thermostat.

This is the way it is was connected on the board on the furnace, 5 terminals, C which was connected to a white wire running to the AC, a G terminal connected to the G on the thermostat, a Y terminal connected to a red wire going to the AC and also a Y terminal on the thermostat,W connected to the W, and finally R connected to the RH on the thermostat. Also RH and RC are connected together on the thermostat. So i had only 4 wires from the furnace to the old thermostat.

I have about 12 terminals on the new thermostat: N,I1,I2,Dh,C,H,Y2,R,Ob,W2,G,Y1

This is what i did for the new thermostat. The C terminal on the furnace runs to the C on the thermostat and also a white wire to the AC unit. G to G. Y to Y1 on the thermostat and aslo the Red wire going to the AC. W to W2 and R to R. So i am using 5 wires now.

The thermostat is working so i obviously have power to it, when i switch to AC, the compressor doesnt kick in. Does anybody have any clue what i did wrong ????

Thanks and sorry this is so long.


02:33PM | 01/31/05
Member Since: 01/30/05
2 lifetime posts
Also i forgot, i have a gas furnace if it helps and also i ran a new 8 conductor wire if i need more wires ???


09:41AM | 02/14/05
Member Since: 02/13/05
3 lifetime posts
Just follow the furnace termianls with the t-stat. They always match.

Example, W on stat, w on furnace baord or terminal, usually the white wire would be the wire you use.

red wire, goes on R for the furnace and R on the furnace terminal. Yellow is for Y on the stat and the furnace (sometimes there is no yellow so use the blue wire in place of yellow

R (could be RC and RH) 24 vac supply terminal

W1-Heating (first stage)

W2, for 2-stage heat or gas valve

Y1-single stage AC (the wiring for the outdoor unit is usually hooked up with it)

Y2-second stage cooling (if you have two compressors)

G is for fan circuit Usually gren wire

hope this helps



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