ecobee thermostats require a C (popular) wire to energy on. When your current thermoregulator utilizes just two cables (R and W, or T and T), you can find a few installation choices available, based on the application.
Before starting out, take note the immediate following:
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You simply will not manage to install the Power Extender Kit (PEK) with heat-only systems that are 2-wire. The PEK is only able to be properly used on furnace or temperature pump systems that don’t have C cable — it is because the PEK calls for R (energy), G (fan), and Y (compressor) cables to work, and these 2-wire systems that are heat-only not need these G and Y cables
To ascertain compatibility, you will need to access both the wiring at your thermoregulator along with the wiring at your home heating where in fact the thermoregulator wiring finishes.
You can reach out to ecobee support for guidance, or hire a technician to aid in installation if you are not comfortable doing so
ACTION 1:DETERMINE JUST HOW MANY THERMOSTATS YOU HAVE CONTROLLING YOUR HEATING SYSTEM
When you have one thermostat managing your heating system, continue to step two below.
Step 2:Determine how many additional cables you have actually behind your wall surface at the thermoregulator
Eliminate your thermoregulator from the wall surface to see any unused cables which are maybe perhaps perhaps not presently linked to your thermoregulator. Make sure to always check 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 quantity down and continue to step three.
Action 3:Determine just just just what wiring terminals you’ve got in your home heating
The next thing involves confirming exactly what your thermostat cables connect 
with at your heating gear.
Make a note of the wiring tints at your thermostat as well as the forms of terminals they’ve been linked to. Next, find your thermoregulator wires at your heating gear. You will need to find the part of that the two low-voltage thermostat wires join up together with your gear.
With respect to the make and model of the equipment, your thermoregulator wires may connect with the annotated following:
- Wiring terminals such as for example R, W, and C at your furnace
- A fuel valve with terminals such as for example Th, Tr, and Th-Tr
- T/T connections, usually attached to an Aquastat
Situation A:MY THERMOSTAT LINKS TO R AND W
In case your thermostat cables connect with terminals marked R and W, installation can be straightforward as linking a 3rd cable to your typical regarding the furnace or boiler’s low-voltage point that is common. According to your furnace, this might be either a terminal marked “C” or “Com 24V”, or perhaps you might need certainly to find in which the popular may be attached to.
Every furnace and boiler which includes a 24vac transformer will have a typical terminal—just trace the 2 low-voltage wires to discover where they connect with. When there is a current connection point, then touch the C cable from the thermoregulator only at that point. Often cutting/stripping the typical cable for splicing the thermoregulator’s C cable can also be needed.
IF AN EXTRA is had by you WIRE
Merely link the extra cable to your connection point that is common.
IF NO EXTRA is had by you WIRES
Should you not have any extra cables, you’ve got two choices:
- Run a extra cable at your thermoregulator down to your gear
- Buy and use a Fast-Stat Common Maker
ALTERNATE SOLUTION: 24VAC TRANSFORMER that is PLUG-IN
Another solution would be to power the ecobee having a outside 24VAC plug-in transformer. This transformer may be attached to a wall surface, and will be wired the following:
- The 24VAC transformer cables would hook up to RC and C in the ecobee
- The 2 cables on the old thermostat would connect to RH and W1 from the ecobee
NOTE: make sure the transformer can perform 24V AC production ( perhaps maybe maybe not DC production)