My thermostat has just two wires. Am I appropriate for ecobee?

My thermostat has just two wires. Am I appropriate for ecobee?

ecobee thermostats require a C (common) wire to energy on. If for example the current thermoregulator makes use of just two cables (R and W, or T and T), there are a few installation choices available, based on the job.

Before starting, take note the annotated following:

    You’ll not manage to install the Power Extender Kit (PEK) with heat-only systems that are 2-wire. The PEK can just only be utilized on furnace or temperature pump systems which do not have C cable — it is because the PEK calls for R (energy), G (fan), and Y (compressor) cables to work, and these 2-wire heat-only systems do n’t have these G and Y cables

To ascertain compatibility, you will have to access both the wiring at your thermoregulator plus the wiring at your home heating where in fact the thermoregulator wiring finishes.

If you should be not comfortable doing this, you’ll touch base to ecobee help for guidance, or employ a professional to assist in installation

  • Based on exactly how many free cables you’ve got behind the wall surface in the thermostat, a few of these choices will need extra elements that aren’t added to the ecobee, including operating brand brand brand new cables and/or buying an external 24VAC transformer, SP/NO isolation relay, or Fast-Stat Common Maker

    When you have one thermostat managing your heating system, continue to step two below.

    Action 2:Determine how many additional cables you have actually behind your wall surface in the thermostat

    Eliminate your thermoregulator from the wall surface to check out any unused cables which are perhaps maybe not presently linked to your thermoregulator. Make sure to check always behind the wall surface during the thermoregulator aswell. The wire bundle at the thermostat will contain more than two wires total, with numerous unused wires available for use in some cases.

    Note this number down and continue to step three.

    Action 3:Determine just what wiring terminals you’ve got on your own heat

    The next thing involves confirming exactly what your thermostat cables connect to at your heating gear.

    Make a note of the wiring tints at your thermoregulator therefore the forms of terminals they’ve been linked to. Next, find your thermoregulator wires at your heating equipment. You will need to find the true part of that the two low-voltage thermostat wires join up along with your gear.

    According to the make and model of one’s gear, your thermoregulator wires may hook up to the annotated following:

    • Wiring terminals such as for example R, W, and C at your furnace
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    • A gasoline valve with terminals such as for instance Th, Tr, and Th-Tr
    • T/T connections, usually attached to an Aquastat


    In case your thermostat cables connect with terminals marked R and W, installation can be straightforward as linking a 3rd cable into the typical in the furnace or boiler’s low-voltage point that is common. Based on your furnace, this might be either a terminal marked “C” or “Com 24V”, or perhaps you might want to find in which the popular could be attached to.

    Every furnace and boiler which has a transformer that is 24vac have a standard terminal—just trace the 2 low-voltage wires and discover where they hook up to. When there is a current connection point, then touch the C cable from the thermoregulator as of this point. Often cutting/stripping the wire that is common splicing the thermoregulator’s C cable are often needed.

    IF AN EXTRA is had by you WIRE

    Merely link the extra cable into the typical connection point.


    You have two options if you do not have any additional wires:

    • Run a wire that is additional your thermostat down to your gear
    • Buy and put in a Fast-Stat Common Maker


    A different is always to power the ecobee having a outside plug-in transformer that is 24VAC. This transformer could be connected to a wall surface, and is wired the following:

    • The transformer that is 24VAC would hook up to RC and C from the ecobee
    • The 2 cables on the old thermostat would connect with RH and W1 in the ecobee

    NOTE: Ensure the transformer can perform 24V AC production ( maybe maybe maybe not DC production)

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