A common wire (C) is required for
5-wire thermostats. If there are only 4
wires to your existing thermostat (i.e.
there is no C wire), you can use the
ecobee Power Extender Kit to power
your thermostat.
Step 1. Install Wiring Harness
The Power Extender wiring harness must be installed in an indoor, dry
location, near the HVAC equipment. When choosing a location, the
distance between the wiring harness and the HVAC equipment must not
exceed 24 inches (0.6 m) .
This equipment is sensitive to electrostatic discharge (ESD). Before
starting, discharge your body of static electricity by touching a
grounded metal object. Always hold the devices by their edges
and do not touch any of the internal components.
1. Power off the HVAC equipment.
2. Remove the top cover of the wiring harness by gently squeezing its
sides.
3. Use 2 #6 pan-head screws or double-sided adhesive to attach the
wiring harness to a flat surface (for example, the furnace casing).
!
Step 2. Install Diode
The diode is designed to be installed behind the thermostat, within the
thermostat’s backpanel wire opening.
1. Use your fingers to gently pry the thermostat away from its base.
2. Using the thermostat’s backpanel wire opening as a guide, gently
bend the diode wires 90 degrees so that they can be inserted into the
W O/B and Y terminals:
The diode itself should stay within the wire opening.
3. Clip the diode legs so that you can insert them into the W and Y
terminals. DO NOT over clip the legs.
4. Connect the diode legs to the W O/B and Y terminals.
Y N/C
W
O/B
G
RC
RH
C
Y2
W2
AUX
W
Y
N/C
G
RC
RH
C
Y2
W2
AUX
W
Y
W
O/B
Y
Wiring Channel
Removeable Cover
Power Extender Kit
W
Y
Diode
G
C
W
Y
RH
RC
G
C
W
Y
RH
RC
STAT
EQUIP
Thermostat Side
HVAC Side
Mounting Hole
Mounting Hole
Power Extender Kit
User Manual
Wiring Harness
