Ecobee3 User Guide and wiring diagrams

Ecobee3 User Guide and wiring diagrams

Do you hear that?
That’s the sound of hundreds of thousands of ecobee-ers welcoming you to the hive. Congratulations on the purchase of your new ecobee3 smarter wi-fi thermostat with remote sensor. This guide will provide an overview of the features and capabilities of the new product and will help you get up and running. Make sure you also take a look at the Quick Start Guide and the Installation Guide that come in the box with your ecobee3.

  • Remote sensors – Deliver the right temperature in the rooms that matter most as well as detect when these rooms are occupied.
  • Smart – Your ecobee3 understands your home’s unique energy profile and the weather outside, making sure you’re comfortable at all times.
  • Intuitive – With its 3.5" full color touch display, your ecobee3 has intuitive controls just like your smartphone.
  • Accessible from anywhere – Monitor and control the temperature in your home anytime, anywhere, on your smartphone, tablet, or computer.

Touch Screen
Your ecobee3 has a touch screen, similar to that used in smartphones and tablets.

  1. Touch items to select or activate them. For menus with a >, this will expand the menu to display additional options or submenus.
  2. Swipe up and down to display additional information. Swiping on a temperature bar will also adjust the settings up or down.
  3. Swipe left and right to scroll horizontal lists that contain multiple items to choose from.

Web Portal
Once registered (page 8), you can log in to your web portal and manage your ecobee3 from your computer or tablet.

Once registered

From the web portal, you can:

  1. Control current temperature and operation
  2. Adjust your schedule
  3. Set vacation periods
  4. View the weather forecast for your area
  5. Set thermostat preferences
  6. Manage all your ecobee thermostats
  7. Save energy with HomeIQ and insights

To access your customized web portal, visit and click on the Login link.
To select a tile, touch or click on it. To close a tile and return back to the main screen, touch or click X (top-right corner).

Guided Setup Process
The Installation Guide that ships with your ecobee has the necessary instructions to wire up and install your device. After installing your ecobee3 thermostat on the wall and powering it up, you will be guided through the first-run process. Complete these steps to get it configured and connected online so you can make use of all its smart features.
This will take you through the following steps:

  • Wiring configuration and equipment configuration
  • Setting your preferences
  • Wi-Fi configuration
  • Registering your ecobee3

If you make a mistake at any time or want to review a setting, you can touch Back to display the previous screen.

Step 1. Wiring Configuration
Your ecobee3 automatically detects and displays which wires are connected to it when it first powers on. It will warn you if you’ve wired a configuration that it doesn't recognize. If the reported connections are different than what you have actually connected, call ecobee support for guidance. Touch Next to continue.

Step 2. Accessory Confirmation
Your ecobee3 will ask if you have any accessories like humidifier, dehumidifier, or ventilator connected to it. Touch Yes if you have one of these devices; otherwise touch No.
If you selected Yes, you will need to specify if the accessory is internally powered:

  • Touch Yes if your accessory is externally powered (i.e. the ecobee3 does not provide power to it). This is the case if there are connected to both ACC+ and ACC-.
  • Touch No if your accessory receives power from your ecobee3. There will be a single wire to ACC+.

Step 3. Temperature Preference Setup
Your ecobee3 will ask you to select Fahrenheit or Celsius as your preferred temperature units. Touch Next to continue.

Step 4. Equipment Configuration
Your ecobee3 will ask you to configure your equipment. Depending on your wiring, different options will be available. These options will configure basic system operation as well as optimize the system for your specific type of equipment. Review the list to see if any devices require additional configuration ("Configuration needed") and if the default settings are valid.

Once you are done, touch Next to continue.

Heat Pumps
If you have a heat pump installed:

  1. Select the heat pump menu.
  2. Select Air to Air or Geothermal depending on the type of your heat pump system
  3. Specify what the heat pump runs when the O/B Reversing Valve is engaged: On Cool runs cooling when O/B engages (most cases), or On Heat runs heating when O/B engages.
  4. Touch Next. You will be returned to the Equipment configuration menu.

If you have a furnace or boiler installed:

  1. Select the heating menu.
  2. Configure the heater type: Furnace: Optimizes ecobee3 for systems using forced air, Boiler: Optimizes your ecobee3 for systems using radiators or in-floor heat.
  3. Touch Next. You will be returned to the Equipment configuration menu.

If you have a humidifier installed:
1. Select Accessory menu.
2. Select Humidifier.
3. Touch Next.
4. Select the type of humidifier you have: Evaporative or Steam. If unsure, select Evaporative.
5. Touch Next. You will be returned to the Equipment configuration menu.

If you have a dehumidifier installed:

  1. Select Accessory menu.
  2. Select Dehumidifier.
  3. Touch Next.
  4. Select Open if the dehumidifier is active when the relay is open; otherwise select Closed. If unsure, select Closed (if the dehumidifier runs when it shouldn't, you can change this option in the Equipment Configuration menu (page 24).
  5. Touch Next. You will be returned to the Equipment configuration menu.

Ventilators (ERV/HRV)
If you have a ventilator (ventilator, ERV or HRV) installed:

  1. Select Accessory menu.
  2. Select Ventilator.
  3. Touch Next.
  4. Select the type of ventilator you have installed: Ventilator, Energy Recovery Ventilator or Heat Recovery Ventilator.
  5. Touch Next.
  6. Select the preferred minimum runtime (min/hr) when your home is occupied and the runtime for when your home is unoccupied. If unsure, keep the default 20 min/hr value or contact a professional.
  7. For HRVs, select whether or not you would like to use it t use it to dehumidify in winter.
  8. For Ventilators, select whether or not you would like to enable free cooling.
  9. Touch Next. You will be returned to the Equipment configuration menu.
File NameLink
Ecobee3 User guide
Ecobee3 Quick start guide
Ecobee3 Installation guide
Ecobee3 Room Sensor guide
File NameLink
Ecobee3 Conventional heating/cooling
Ecobee3 Heat pump with auxiliary heat
Ecobee3 Heat pump with auxiliary heat and no C wire (Using PEK)
Ecobee3 Boiler radiant system
Ecobee3 HVAC accessory devices

Step 5. Name Your Thermostat
After configuring your equipment, you will be prompted to give your ecobee3 a name. Select a name from the list or enter your own using the on-screen keyboard. This name will appear in your web portal, so pick a name that makes it easy to identity your thermostat (this is especially important if you have more than one in your house). Touch Next to continue.

Step 6. Configure Ideal Temperatures
Next, slide the set-point bubble up and down to select the preferred, normal temperature for your home during winter and summer (touch Next after each). This setting will be used to generate the default comfort settings.

Step 7. Select Current HVAC System Mode
Select the operating mode of your HVAC equipment. For example, if you want to set your HVAC system to heat, select Heat. If you do not want the system to run, select Off. Touch Next to continue.

Step 8. Configure Sensor Settings
Your ecobee3 includes sensors that can determine when you are home. You can have your thermostat automatically go into energy savings mode when you are away. For a detailed description of how the settings work, see page 13.

  1. Enable or disable Smart Home/Away setting. If enabled, your ecobee3 senses when you are home during a scheduled Away period, or away during a scheduled Home period, and will automatically override your scheduled settings to maximize comfort and savings.
  2. Touch Next to continue.

Step 9. Wi-Fi Configuration
To get the most out of your ecobee3, it needs to connect to your home's Wi-Fi network. Touch Next to configure your network settings. If you do not want the ecobee3 to connect to the Internet, touch Skip and confirm the action by pressing Next. When configuring your network settings, your ecobee3 will display a list of all visible Wi-Fi networks along with their signal strength. If your network has weak signal strength, try moving your router closer to the ecobee3.


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