Ecobee B2219369 User Manual
How to install
your ecobee3 lite
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Download the ecobee
app for customized
installation instructions.
Or continue reading!
Table of contents
What’s in the box
Guide 1 or Guide 2?
Guide 1: Install with a C-wire
Guide 2: Install without a C-wire
Extras
5
7
14
29
54
First things first. Here’s what
you’ll find in the box.
H
R
Rc
C
G
Y1
W1
W2
Y2
PEK
O/B
ecobee thermostat ecobee backplate Power Extender Kit
(PEK)
Screws
Drywall plugs
Trim plate
Install guide (this booklet)
and wire labels
You’ll also need these tools:
Drill for mounting anchors
(3/16” drill bit)
OPTIONAL
Small flathead
screwdriver
Phillips
screwdriver
Hammer
Pencil
Wire stripper
Guide 1 or Guide 2?
Start here to find out.
The steps in this section will help
you decide which install guide you’ll
use to complete the installation.
These icons indicate useful tips and important reminders.
STEP 1
Power off your Heating, Ventilation and Air
Conditioning (HVAC) system by using the
master switch or circuit breaker box. This is
important for your safety.
ON
OFF
OR
OFF
ON
TIP:
Look for your master switch or circuit breaker box in the basement,
attic, utility closet, or behind a wall panel near the thermostat.
STEP 2
Confirm your system is off by turning on
your heat (during winter) or your AC (during
summer). Wait a few minutes - you should
not feel air coming from your vents.
TIP:
If you have a boiler, check to see that the main flame is extinguished.
STEP 3
Remove your old thermostat cover from
the wall.
OR
TIP:
Many thermostats simply pop off or unclip from the base,
while others may have screws that you will need to remove.
CHECKPOINT: COMPATIBILITY
L1 L2
Does your old thermostat’s backplate have
any of these indicators?
110 VAC
OR
WARNING
HIGH VOLTAGE
YES NO
Sadly, you might
not be compatible
You can double check here:
ecobee.com/compatibility
Great, please
continue to
the next page
120 VAC
OR
240 VAC
STEP 4
Take a picture of the wires connected to the
terminals of your old thermostat. You may
need to reference this photo later on.
WARNING:
ecobee3 lite is designed for 24VAC with a 2A maximum current.
Do not connect it to line (high) voltage or millivolt systems.
CHECKPOINT: C WIRE
Do you have a C wire connected to your
old thermostat?
YES
OR
RC RH RC RH
YES NO
Continue to
Guide 1
NO
Continue to
Guide 2
GUIDE 1
Install your ecobee
with a C wire
If you have a C wire, it will power your
ecobee. You won’t need the Power
Extender Kit included in the box.
CHECKPOINT: DON’T SKIP AHEAD
Have you completed steps 1 - 4 in the ‘Start
Your Install’ section?
YES NO
Continue to
the next page
Return to step 1
in ‘Start Your Install’
STEP 5
Carefully disconnect and label the wires from
your old thermostat one at a time, using the
labels provided.
Rc
Y/Y1
W/W1
RC RH
TIP:
If you have a jumper between Rc, Rh or R, leave it alone. Only label
the wires that run from your wall into a terminal block.
STEP 6
Unscrew the mounting plate of your old
thermostat to remove it from the wall.
W/W1
C
R
Y/Y1
RC RH
WAR NIN G :
Be careful, as some thermostats may contain mercury. Recycle your
old thermostat safely with your local hazardous waste facility.
STEP 7
Decide if you want to use the trim plate with
your ecobee. The trim plate is useful if you
want to hide marks or holes left on the wall
by your old thermostat.
R
R
H
Rc
Rc
G
G
Y1
Y1
Y2
Y2
O/B
O/B
H
C
C
W1
W1
W2
W2
PEK
PEK
OR
STEP 8: OPTIONAL
If using the trim plate, align the mounting
holes on the trim plate and backplate and
press them into place together.
STEP 9
Pull the wires through the hole in the
middle of the backplate and then attach
the backplate to the wall using the drywall
anchors and screws provided.
G
Y/Y1
Rc
W/W1
C
TIP:
Use a 3/16” drill bit to drill a hole for the drywall plugs.
CHECKPOINT: INSERT YOUR R WIRE(S)
Do you have more than one R wire?
(That includes R, Rc, and Rh)
NOYES
H
R
R
H
W/W1
C
W1
W2
PEK
OR
O/B
Rc
G
Y1
Y2
Y/Y1
H
R
G
W/W1
C
O/B
Rc
G
Y1
Y2
Y/Y1
R
G
C
NOYES
Insert your wires: Insert your single
R oR Rc Rc
Rh Rh
Rc or Rh wire into
R,
Rc terminal.
the
R
C
W1
W2
PEK
H
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