1

I am in the process of installing a new thermostat that requires a c wire. I checked my thermostat to see if it has a c wire running to it and it does not. After doing lots of googling and watching youtube video I think I know what to do but would like somedody that knows to verify it is correct before I attempt something like this.

I noticed where the wires run to the thermostat it has a extra wire (orange) not in use.

thermostat wiring

I then checked where the furnace to verify the same wire is not attached to nothing and it is not.

furnace wiring

If I am looking at it correctly I can connect the extra wire orange to the to the orange wire from the furnace which is not connect to anything (which if I am reading it right is the c wire) This would work correct? I am new at this and do not want to mess anything up.

Improve this question
2
  • 2
    The wires in the thermostat are stripped back way too far. Trim them down and reclamp them.
    – ratchet freak
    Commented Jun 20, 2017 at 9:36
  • Common convention is to use the blue wire for C, if it's unused.
    – Harper - Reinstate Monica
    Commented Jun 20, 2017 at 16:38

1 Answer 1

Reset to default
1

It's a little unclear exactly what you're asking, but it sounds like you're on the right track. If the orange wire is unused (unconnected at both ends), you can use it as a C wire. Connect the one end to the thermostat's C terminal. Then connect the other end to the C terminal in the furnace.

If the furnace does not have a C terminal, please see this answer for help figuring out where to connect the wire.

According to the schematic, the grey wire should be C.

enter image description here

Improve this answer
11
  • Thanks, and just to be sure based on this picture (link listed below and zoom in to see the diagram in the back) the c wire is orange correct? Thanks, flic.kr/p/VXVpiZ
    – Jeremy
    Commented Jun 20, 2017 at 15:40
  • @Jeremy Umm... No. That diagram is for the blower motor. If you look at the rest of that label, you'll likely find a wiring diagram for the low voltage control wiring (which is what you're dealing with).
    – Tester101
    Commented Jun 20, 2017 at 15:55
  • bummer, I tried looking and I am having trouble finding a diargram but I am not sure what I am looking at so I could be overlooking it..What should I do? The model is e3eb-017h. and Is the smaller thin wires that have the wire nuts on them the thermostat wires? I noticed they are the exact same colors that are under the thermostat itself. A full pic of what I see when I open the door is below. thanks for your help, flic.kr/p/UGkHkf
    – Jeremy
    Commented Jun 20, 2017 at 16:55
  • @Jeremy on the same label as the motor wiring diagram, to the left, there's a schematic. Please post a clear photo of that.
    – Tester101
    Commented Jun 20, 2017 at 19:55
  • thanks link to new pic is below also noticed the blue wire is not attached to anything but under the thermostat it is attached to g. flic.kr/p/UKAVra
    – Jeremy
    Commented Jun 20, 2017 at 21:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.