ecobee orporated EBSTAT3LT01 Smart Thermostat User Manual ecobee3 lite Technical Manual
ecobee Incorporated Smart Thermostat ecobee3 lite Technical Manual
Contents
- 1. User Manual
- 2. user manual
user manual

   | 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5                                           
Toll Free 1.877.932.6233, Int. 1.647.428.2220, support@ecobee.com 
Technical manual 
ecobee3 lite 
GETTING STARTED 
Welcome 
Thank  you  for  supporting  ecobee,  the  Smart 
Thermostat  that  provides  your  customers  with 
freedom and flexibility in managing their home 
environment.  The  ecobee  Smart  Thermostat 
has  been  designed  in  partnership  with  HVAC 
contractors to ensure the installation process is 
simple  and  efficient.  This  step-by-step 
Installation  Manual  will  walk  you  through  all 
aspects  of  the  installation.  To  ensure  an  on-
going service relationship with your customers, 
please  register  all  of  your  ecobee  Smart 
Thermostats in your Contractor Portal.  
The ecobee Team 
Technical support 
Our  technical  support  team  is  available  to 
answer your  
questions  at  1.877-9-ecobee  (1.877.932.6233), 
or via  
email at support@ecobee.com 

   | 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5                                           
Toll Free 1.877.932.6233, Int. 1.647.428.2220, support@ecobee.com 
Before You Begin 
This product is intended to be installed by trained 
service professionals 
This manual explains the procedures for installing the 
ecobee Smart Thermostat. Please read it carefully 
before 
beginning the installation. 
For information on how to operate the ecobee Smart 
Thermostat, please see the ecobee User’s Manual. 
The ecobee Smart Thermostat consists of two parts 
(see images below): 
1. A Smart Thermostat to be mounted on the 
homeowner’s wall. 
2. An Equipment Interface Module This should be 
mounted in the homeowner’s utility room and 
connects to the heating, cooling and ventilation 
equipment. 
Caution: Disconnect electric power to the system 
before installing this product. Failure to do so could 
result in electric shock and/or equipment damage. 
All wiring must conform to your local electrical code. 
Mercury Notice: This product does not contain 
mercury. 
If you are replacing a product that does contain 
mercury please contact your local waste-management 
authority for disposal instructions. Do not discard the 
old product in the regular trash. 
HVAC System Compatibility information 
ecobee is designed to operate low-voltage heating 
and cooling systems. It is not designed for use with 
line voltage or millivolt heating and cooling systems. 
Ecobee supports control of up to four heating stages 
and two cooling stages. It also supports control of 
humidifiers, dehumidifiers, heat-recovery ventilators 
and energy-recovery ventilators. 
Equipment Description 
Gas/Oil/Electric heating (up to three stages) Yes 
Heat pump with auxiliary heat (up to four stages) Yes 
Geothermal Heat Pump Yes 
Duel fuel systems Yes 
Standard electric cooling (up to two stages) Yes 
Boilers Yes 
Central humidifier Yes 
Central dehumidifier Yes 
Heat Recovery Ventilator (HRV) Yes 
Energy Recovery Ventilator (ERV) Yes 
Sensors with dry contact outputs Yes 
Approvals 
This product was designed and built in accordance to 
RoHS directive 2002/95/EC and contains no 
hazardous substances as defined by this directive. 
Optional Power supply meets EPA C.E.C Level IV 
and E.C CoC No Load power Consumption 
requirements. It is also safety approved to UL/cUL 
standards. 
FCC Compliance Statement 
This equipment has been tested and found to comply 
with the limits for Class B digital devices, pursuant 
to Part 15 of the FCC Rules. These limits are 
designed to provide reasonable protection against 
harmful interference in a residential installation. This 
equipment generates uses and can radiate radio 
frequency energy and, if not installed and used in 
accordance with the instruction manual, may cause 
harmful interference to radio communications. 
However, there is no guarantee that interference will 
not occur in a particular installation. 
If this equipment does cause harmful interference to 
radio or television reception, which can be determined 
by turning the equipment off and on, the user is 
Encouraged to try to correct the interference by one or 
more of the following measures: 
Reorient or relocate the receiving antenna 
Increase the separation between the equipment 
and receiver Connect the equipment to an outlet on a 
different circuit from the receiver Consult the dealer or 
an experienced radio/TV contractor for help. 
Warning: Changes or modifications not expressly 
approved by ecobee Inc. could void the user’s 
authority to operate the equipment. 
To satisfy FCC/IC RF exposure safety requirements, 
a separation distance of 20 cm or more should be 
maintained between this device and persons. To 
ensure compliance, operation at closer than this 
distance is not allowed. 

   | 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5                                           
Toll Free 1.877.932.6233, Int. 1.647.428.2220, support@ecobee.com 
Specifications 
Temperature ranges 
Heat: 45 – 79°F (7 – 26°C) 
Cool: 58 – 92°F (14 – 33°C) 
Display: 40 – 100°F (5 – 37°C) 
Sensitivity: +/- 1°F (0.5°C) 
Equipment Interface Operating: -40o to 160oF (-40o 
to 70oC) 
Thermostat Operating: 32o to 130oF (0o to 55oC) 
Humidity Range 
Humidify: 20 to 50% R.H 
Dehumidify: 30 to 60% R.H 
Display: 0 - 90% R.H 
Sensitivity: +/- 2% R.H. 
Operating: 5 – 95% R.H non-condensing 
Dimensions 
Thermostat: 5.5”W x 3.25”H x 1”D (139.5mm H x 
82.5mm W x 25mm D) 
Equipment Interface: 4.6”W x 10”H x 1.3”D (118mm 
W x 254mm H x 32mm D) 
Power 
AC Transformer - 24 VAC - 3VA Minimum (not included) 
Battery – CR2032 – 3V lithium coin cell (included) 
Wiring Specifications 
Refer to this table to determine maximum wire lengths 
allowed:  
Smart Thermostat to Equipment Interface 
18 AWG 20 AWG 22 AWG 
1250ft/380m 790ft/240m 500ft/150m 
Equipment Interface to heating/air equipment 
18 AWG 20 AWG 22 AWG 
128ft/39m 80ft/24m 50ft/15m 
Configuring the 
Smart Thermostat 
Configuring the Installer Settings 
Installer Settings let you configure the settings related 
to the various devices (such as a furnace, air 
conditioner, humidifier, dehumidifier or ventilator) that 
are connected to the Equipment Interface. 
To prevent accidental modifications to these settings 
you can enable a 4-digit installer code. This code is 
pre-programmed to 3262 and can be enabled in the 
Thresholds option menu. 
Installation Wizard 
The Installation Wizard takes you step-by-step 
through a series of choices regarding the HVAC 
equipment intended to be connected to the Equipment 
Interface. 
Simply answer the questions accordingly and press 
Next to advance to the next screen. Once completed  
you will be shown a diagram of the wiring connections 
that reflects the choices made during the wizard 
process. You can press Back to go back and make 
any changes. Once you are satisfied with the setup, 
press Done. 
Equipment 
The equipment setting will allow you to manually 
configure the various devices that are connected to 
the Equipment Interface. 
Heat Pump 
This section allows you to enable and configure up to 
a 2 stage heat pump. If a second stage is required 
you must configure an Accessory relay to control that 
stage Geothermal/Ground Source Heat pump If you 
select Yes, this tells the system a geothermal or 
ground source heat pump is being controlled. This 
helps the Thermostat determine optimum 
performance and default settings. 
If you select NO, the system will optimize for an air-to-
air heat pump. O/B Energize on Cool If you choose 
Yes, the reversing valve output (O/B terminal) will 
activate when there is a call for cooling. If you select 
No, the relay will energize when there is call for heat 
Min Cycle Off Time
 Enables you to configure the 
compressor off time between cycles. This is 
adjustable from 240 - 900 Seconds. 
Min Outdoor Temp
 Allows you to set the minimum 
outside air temperature at which the compressor will 
be disabled. This performs two functions: You can set 
it to prevent the compressor from going on when 
the outdoor temperature is too low, thus resulting in 
damage to the compressor. You can also set this 
value to determine when you want the auxiliary heat 
(if installed) to engage to help meet the set 
temperature. The temperature range is adjustable 
from 0°F (-17.8°C) - 65°F (18.3°C) or can be 
completely disabled. You will need an 
internet connection for this feature to operate 
properly. 
Allow Heat Pump/Auxiliary Heat to Run 
Simultaneously 
If you select Yes and there is a source of auxiliary 
heat, it will turn on in addition to the heat pump. The 
heat pump will be energized for the first 30 minutes. 
If, after 30 minutes, the set point has not been met, 
the auxiliary heat will be energized to assist the heat 
pump in meeting the load.If you select no, the heat 
pump will be energized for up to 2 hours. 

   | 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5                                           
Toll Free 1.877.932.6233, Int. 1.647.428.2220, support@ecobee.com 
 If after 2 hours the set point has not been 
met, the Thermostat will shutdown the heat pump and 
energize the auxiliary heat to meet the set point. This 
option should also be used for installation where the 
heat pump evaporator coil is downstream from the 
source of auxiliary heat. 
Furnace (Auxiliary Heat) 
Allows you to enable and configure up to a 3-stage 
conventional heat source. If you have selected Heat 
pump as your primary source, this feature will allow 
you to configure the auxiliary heat connected to the 
system. 
Furnace Type
Allows you to configure the type of furnace connected. 
This allows the Smart Thermostat to optimize its 
algorithms based on the type of fuel and typical 
characteristics of the chosen system. Choose the 
option that best represents the type of heating system 
installed. 
Heat Stages
Allows you to configure up to 3 stages of 
heat. If you require a third stage, you must configure 
an accessory relay to control that stage. 
Heat Fan Control This option allows you to determine 
if the system fan is controlled by the system during 
heat cycles, or if the Thermostat is required to control 
the fan. Normally the HVAC system controls the fan 
during heat cycles. 
Air Conditioner 
Allows you to enable and configure up to 2 stages of 
air conditioning. If you require a second stage, you 
must configure an accessory relay to control that 
stage. 
Staging Method of Operation 
The ecobee Smart Thermostat uses a unique method 
for staging for multi-stage heating or cooling. It uses 
a combination of intelligent algorithms and past 
performance to determine when to activate the 
stages. 
When there is a call for heat or cool, the system 
computes how long it would take for the system to 
reach the desired set point in stage 1, stage 2 or 
stage 3 accordingly. It will determine the highest stage 
at which a minimum of 10 minutes of run time is 
required. It will then automatically start the system at 
that stage (ie if it calculates that it will take 15 minutes 
at stage 2 but only 7 minutes at stage 3, the system 
will immediately turn on stage 2 to meet the set point). 
If the calculation indicates to start at stage 1, and it 
takes more than 10 minutes to reach the set point, 
it will automatically engage stage 2. If stage 2 runs for 
more than 10 minute without reaching the set point it 
will activate stage 3. A minimum run time of 10 
minutes is used to ensure that proper circulation 
throughout the system and that minimum cycle times 
are maintained. For heat pumps with auxiliary heat, 
the operation of the auxiliary heat will depend on the 
configuration of the Allow Heat 
Pump/Auxiliary Heat to Run Simultaneously
. 
Accessory relays 
Accessory relays are generic relays that can be 
configured to control the following; 
Heat Stage 3 Select this option when the Thermostat 
is required to control a 3-stage conventional heating 
system. Connect the third stage (or W3) contact to 
this accessory relay.  

   | 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5                                           
Toll Free 1.877.932.6233, Int. 1.647.428.2220, support@ecobee.com 
List of Alerts 
Below is a complete list of alerts. Depending on your 
configuration, some of these may not apply to your 
system. 
• Low Battery 
• Furnace Air Filter 
• Ventilator Filter 
• UV Lamp 
• Humidifier Filter 
• Comms fault 
• Low Temp. Alert 
• High Temp Alert 
• Low Humidity Alert 
• High Humidity Alert 
• Heat Not 
• Responding 
• Cool Not 
• Responding 
• Input 1 
• Input 2 
• Maintenance 
• Reminder 
• Auxiliary Heat 
• Run Time 
• Auxiliary Outdoor 
• Temperature 
• The battery in your Thermostat will need 
• to be changed soon. 
• Your furnace filter needs to be 
• cleaned/changed. 
• Your ventilator filter needs to be 
• cleaned/changed. 
• Your UV lamp needs to be changed. 
• Your humidifier pad needs to be 
• cleaned/changed. 
• There is no communication between the 
• Thermostat and the Equipment Interface 
• module. 
• The temperature in the home is too low. 
• The temperature in the home is too high. 
• The humidity in the home is too low. 
• The Humidity in the home is too high. 
• The system has failed to heat the home. 
• The system has failed to cool the home. 
• Used if this input is programmed to 
• generate an alert. 
• Used if this input is programmed to 
• generate an alert. 
• You are due for regular maintenance. 
• Your auxiliary heat source is running 
• too often. 
• Your auxiliary heat source is running 
• at higher than expected outdoor 
• temperatures. 

   | 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5                                           
Toll Free 1.877.932.6233, Int. 1.647.428.2220, support@ecobee.com 
3-Year Limited Warranty 
ecobee warrants that for a period of three (3) years 
from the date of purchase by the consumer 
(“Customer”), the ecobee Smart Thermostat 
(excluding battery) (the 
“Product”) shall be free of defects in materials and 
workmanship under normal use and service. During 
the warranty period, ecobee shall, at its option, repair 
or replace any defective Products, at no charge for 
labour or materials. Any replacement and/or repaired 
device are warranted for the remainder of the original 
warranty or ninety (90) days, whichever is longer. 
If the product is defective, call Customer Service at 
1-877-9-ecobee. ecobee will make the determination 
whether a replacement product can be sent to you or 
whether the product should be returned to the 
following address: ecobee Customer Service, 477 
Richmond Street West, #210, Toronto, ON M5V 3E7, 
Canada. 
In the event of a failure of a Product, Customer may: 
(a) if Customer did not purchase the Product directly 
from ecobee, contact the third party contractor from 
whom the Product was purchased to obtain an 
equivalent replacement product, provided the 
contractor determines that the returned Product is 
defective and Customer is otherwise eligible to 
receive a replacement product; (b) contact ecobee 
directly for service assistance at 1-877-9-ecobee and 
ecobee will make the determination whether an 
advance equivalent replacement Product can be sent 
to Customer with return shipping supplies (in which 
case a hold shall be put on Customer’s credit card 
for the value of the replacement Product until ecobee 
has received the defective Product). Product should 
be returned to the following address:  
ecobee Customer Service, 477 Richmond Street 
West, #210, Toronto, ON M5V 3E7, Canada. If the 
returned Product is found by ecobee to be defective 
and Customer is otherwise eligible to receive a 
replacement product, no amount shall be charged to 
Customer’s credit card; or (c) ship the defective 
Product directly to ecobee, in which case Customer 
shall contact ecobee directly at 1-877-9-ecobee, so 
ecobee can make the required shipping 
arrangements. Upon receipt of the defective 
Product, ecobee will ship an equivalent replacement 
product to Customer, provided the returned Product 
is found by ecobee to be defective and Customer is 
otherwise eligible to receive a replacement product. 
Warranty 
This warranty does not cover removal or reinstallation 
costs and shall not apply if the damages were found 
to be caused by something other than defects in 
materials or workmanship, including without limitation, 
if the Product: was operated/stored in abnormal use 
or maintenance conditions; 
authorizes was subject to abuse, neglect, electrical 
fault, improper handling, accident or acts of nature; 
was not installed by a licensed Heating Ventilating 
and Air Conditioning (HVAC) contractor; or 
was installed improperly. 
ecobee’s sole responsibility shall be to repair or 
replace the Product within the terms stated above.  
ECOBEE 
SHALL NOT BE LIABLE FOR ANY LOSS OR 
DAMAGE OF ANY KIND, INCLUDING ANY 
SPECIAL, INCIDENTAL OR CONSEQUENTIAL 
DAMAGES RESULTING, DIRECTLY OR 
INDIRECTLY, FROM ANY BREACH OF ANY 
WARRANTY, EXPRESS OR IMPLIED, OR ANY 
OTHER FAILURE OF THIS PRODUCT.  
Some US states and Canadian provinces 
do not allow the exclusion or limitation of incidental 
or consequential damages, so the above limitation or 
exclusion may not apply to you. 
in materials and workmanship is limited to repair and 
replacement as set forth in this warranty statement. 
All express and implied warranties for the product, 
including but not limited to any implied warranties and 
purpose, are limited to the three-year duration of this 
limited warranty. No waaranties, whether express or 
implied, will apply after the limited warranty period has 
expired. Some US states and Canadian provinces do 
not allow limitations on how long an implied warranty 
lasts, so this limitation may not apply. 
ecobee neither assumes responsibility for nor 
authorizes any other person purporting to act on its 
behalf to modify or to change this warranty, nor to 
assume for it any other warranty or liability concerning 
this product. have other rights which vary from  
jurisdiction to jurisdiction. 
If you have any questions regarding this warranty, 
please write ecobee Customer Service, 477 
Richmond Street West, #210, Toronto, Ontario M5V 
3E7, Canada.