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Hot Topics: Smart Thermostat Compatibility

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Original post: Problems finding smart thermostat compatibility

nobler Member

Hi, I'm trying to upgrade our current thermostat to one of the smart thermostat alternatives offered by the market. I've tried to go through the Google Nest Compatibility Checker and the online chat agent tells me that my wires seem to be compatible but my oven is incompatible.

I have a Trane XV80 central oven and a Trane XB1

3 central AC unit. Here is a picture of my current thermostat setting.

  open thermostat panel

I have several questions. First, what does the W / E connection refer to? I know what W and E refer to individually but when I really plug in a smart thermostat I'm not sure what connection to put the white W / E line in.

Secondly, does anyone know why my oven is incompatible and what is a smart thermostat alternative that would work for me?

lawrosa Super Moderator

you do not have the cable. You would need to install a power extender kit.

My advice would be to get an ecobee if you really want a smart t-state. To me they are just a gimmick ..

T state needs 24 volts and as I said you have no C-cable giving this voltage.

A useful video on this.

And another one.

lawrosa Super Moderator

But because of the power-switching function of the power extension kit, it takes power from your control board. Mug it. Message boards can often fail more often than not. It is my advice to get new t-state wiring to run and add a separate transformer to power the smart t-state.


lawrosa Super Moderator

Most recently, you can get something like this You don't care about a thread going up the wall to your state.

Geochurchi Member

Hello, any spare conductor in that cable behind Tstat, difficult to tell from the pictures, try to pull the cable from the wall, also check the other end of the furnace, post some pictures on the control board at the oven.

lawrosa Super Moderator

Yeah, I see an orange black and blue thread in there. He can get a C-thread. Need a picture of the board by the oven.

I think this is the XV80 card from the crane

 thermostat electronic board

nobler Thread Starter

Here is a picture of the connections to my Trane XV80 oven. If I were to buy something like Ecobee and install the power extension kit that would help me get a C-connection, would it work?

 thermostat cable

lawrosa Super Moderator

There are extra wires in the wall behind t state. Choose one and strip it so you have 5 threads.

Then you will find the extra wire in the oven board up there.

Connect that wire to C at the oven plate. When you connect the t-hook to the cable. It should power the t-state and no power extender is needed ..

Kill the power of the oven when working on that board. com / compatibility / thermostat /

lawrosa Super Moderator

There is a blue black and orange thread in that bundle. Choose one and use it as a c-thread.

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