Forum Discussion

samhain7's avatar
samhain7
Explorer
May 06, 2015

Thermostat wiring

First off, thanks to Soundguy. He has provided lots of useful advice!

Second, sorry for asking someone to hold my hand on this, but I have heard incorrect furnace wiring can be a costly error!

I have my new thermostat and want to hook it up, but I cannot make heads or tails of the instructions. I even hired a furnace guy to come out and even he said he could not figure it out.

WHat I basically need, is if someone knows, to say, put the red wire in port XX. Put the blue wire in port XX...etc.
So here are my pictures.

Old thermostat manual:

New thermostat manual

Wires coming out of the wall:

Old thermostat wiring:

New thermostat wiring:

Any help would be greatly appreciated...
  • darsben's avatar
    darsben
    Explorer II
    May 06, 2015
    no pictures well just one of the back of the thermostat
  • downtheroad's avatar
    downtheroad
    Explorer
    May 06, 2015
    Just match the colors from old stat to new one...white to W, Blue to B, Yellow to Y, dtc.

    Also I think you need to jump Rh to Rc - your Red from the wall goes to that.

  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    May 06, 2015
    Blue 12V - (not used...wire cap it)
    Red 12V + (connect to Rc and then connect jumper from Rc to R)
    Yellow (connect to Y....compressor)
    White (connect to W----furnace)


    NOW you have to make decision on the Green & Grey wiring
    Green is a/c fan high speed and Grey is a/c fan low speed
    You would have to install a mini switch to be able to switch between hgh or low
    OR just wire one of them to the 'G' terminal

    I used just the High (no switch) because a/c should use high fan (low fan with a/c can cause a/c unit to freeze due to low air flow)
  • samhain7's avatar
    samhain7
    Explorer
    May 06, 2015
    Thanks oldbiscuit. EXACTLY what I was looking for. I'll hook it up tomorrow and let you know.
  • SoundGuy's avatar
    SoundGuy
    Explorer
    May 06, 2015
    downtheroad wrote:
    Just match the colors from old stat to new one...white to W, Blue to B, Yellow to Y, dtc.


    Having swapped out thermostats in several trailers myself, having had one friend who managed to fry his furnace circuit board, and knowing of two others who couldn't get the system to work at all by simply matching wire colour codes I would never simply connect wires based on colour code alone ... you want to KNOW beforehand just where each wire goes and what it's connected to at the other end. Don't take the time to figure it out beforehand and one can in an instant be dealing with unintended yet costly repairs. :M
  • samhain7's avatar
    samhain7
    Explorer
    May 06, 2015
    Update:

    Did a little more research and hooked it up as Old-Biscuit suggested.
    Works GREAT!!! Hopefully this thread can help out others who are doing the same mod.

    Thanks Soundguy and Old-Biscuit!

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