need help wiring my new RTH7400D thermostat - http://www.hvacmechanic.com/ Forums
Original message
| philou
 |  "need help wiring my new RTH7400D thermostat"
, posted Sat 19 Feb 11:59:  
I would really apreciate help concerning my new thermostat wiring. I used to have a Honeywell Q674F model and the wiring wasn't exactly the same as in the owner's manual. Here are the wire connections in the old model : 6 wires coming from the back : white on W2, green on G, red on R, Blue on X, orange on O, Yellow on Y. Plus I have a piece of wire that connects 2 screws: E to W2. I don't really know what to do with that piece of wire.
I don't know how to wire my new honeywell RTH7400D thermostat cause of that! Note that I use a heat pump plus oil auxiliary heating.
Thanks for any help
[this message was edited by philou on Sat 19 Feb 12:57] |
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| Xenos
Webmaster 
| "Re(1):need help wiring my new RTH7400D thermo" , posted Sat 19 Feb 13:06
R,G,O and Y are the same. W2 is Aux and X is C.
Xenos.
The best way to escape a problem is to solve it.
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| | philou
| "Re(2):need help wiring my new RTH7400D thermo" , posted Sat 19 Feb 13:28
thank you for that info but I still don't know what to do about the bypass from W2 to E on the old thermostat?
I've already install a RTH7400D in an other house where I had 7 wires coming from the wall and the seventh was connected on E. Now I only have 6 but the E screw is connected to the W2 screw by a wire on the old thermostat. What should I do ?
thanks
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| | Xenos
Webmaster
| "Re(3):need help wiring my new RTH7400D thermo" , posted Sat 19 Feb 13:31
Since W2 is Aux you would jump E to Aux.
Xenos.
The best way to escape a problem is to solve it.
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