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Step 3. Install Power Extender Kit
(PEK)
If you have a wire labelled “C” or “common”, skip this step.
Warning: If you are not comfortable with working with your
HVAC wiring, contact ecobee customer support or hire a
professional installer.
Some thermostats do not have a C-wire. The C-wire is
used to provide power to the thermostat. In this case, the
PEK can use the existing wires to power your thermostat.
The PEK requires your system to have the following wires:
• 4 wires: W, Y, G, and R (or R
C or RH)
• 3 wires: Y, G, and R (or RC or RH)
1. Make sure that your HVAC
equipment is o.
2. Open your HVAC equipment’s
control panel. Take a picture for
reference.
!
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