ecobee

Multi-Speed Fan installations

With the release of firmware versions 4.6.3 and up, the ecobee Smart Thermostat with voice control, ecobee3 lite, and ecobee4 thermostats are now compatible with many low-voltage multi-speed fan systems, including FCU (Fan Coil Unit) and PTAC (Packaged Terminal Air Conditioner) systems.

 


 

Compatibility

 

Compatible single-transformer multi-speed systems include the following:

  • Non-proprietary multi-speed fan systems with multiple "G" wires (G1, G2, G3)
  • 2-Pipe or 4-Pipe Fan Coil Units (FCUs), with or without Aux Heat
  • Multi-speed PTAC (Packaged Terminal Air Conditioner) systems

Compatible ecobee thermostat models include:

  • ecobee Smart Thermostat with voice control
  • ecobee3 lite
  • ecobee4 

Incompatible systems and setups include:

  • ecobee3 and earlier model ecobee thermostats (SMART, SMARTSi, EMS, EMSSi) do not currently support multi-speed fan, FCU, or multi-speed PTAC systems
  • Dual-transformer systems (thermostats with both RC and RH wires) and installations requiring the ecobee Power Extender Kit are not compatible
  • Fan-coil units that require the G1, G2, and G3 wires to be energized simultaneously for high-speed fan
  • AC systems with multi speed fan

To guarantee compatibility, please click here to access our Compatibility Checker.

 


 

 

Wiring and Installation

 

When wiring an ecobee thermostat for a multi-speed fan system, specific wiring terminals on the ecobee will need to be be repurposed to accommodate for the lack of dedicated G2/G3/S1/S2 terminals.:

  • The Y2 terminal can be repurposed as G2 (medium fan speed)
  • The W2 terminal can be repurposed as G3 (high fan speed)
  • The RH terminal can be repurposed as S1 (pipe sensor wire)
  • The PEK terminal can be repurposed as S2 (pipe sensor wire)

When wiring the ecobee for a multi-speed fan system:

  • The low speed fan wire (typically G, Gl, or G1) will go to G on the ecobee
  • The medium speed fan wire (typically G2 or Gm) will go to Y2 on the ecobee
  • The high speed fan wire (typically G3 or Gh)  will go to W2 on the ecobee

For 2-pipe FCU systems that utilize a pipe sensor/changeover sensor/AquaStat:

  • The S1 wire will go to the RH terminal on the ecobee
  • The S2 wire will go to the PEK terminal on the ecobee

NOTES:

  • Only one wire can be placed in each terminal at a time
  • A Power Extender Kit cannot be used for 2-pipe FCU systems, as the PEK terminal will need to be utilized for the pipe sensor
  • Dual-transformer systems (separate boiler and air handler) are not compatible
  • Incorrect wiring or configuration can result in damage to your equipment

If you would like to contact a professional for installation, please click here to find a professional installer in your area.

 


 

Configuring your ecobee for multi-speed fan support

 

Accessing the configuration screen

In order to configure your ecobee for multi-speed fan support, you'll need to select "I'm a pro" during the initial equipment configuration screen.

Multi-Speed_Pro__Selected_.png

If you are powering up your ecobee for the first time:
You should see this screen immediately after selecting "Let's get started" when the thermostat first powers up. 

If your ecobee was previously configured and needs reconfiguration for multi-speed fan
You can reconfigure your ecobee from the Reconfigure Equipment menu.

On the thermostat screen:

  1. Select the Main Menu icon in the bottom left
  2. Select Settings
  3. Select Installation Settings
  4. Select Equipment
  5. Select Reconfigure Equipment

If you do not see this screen: please click here to troubleshoot, or contact ecobee support to request a firmware upgrade.

 

Once you've arrived on this screen:

  1. Select I'm a pro and select Next
  2. Read and acknowledge the caution message and select I understand
  3. Select Yes, only RC is connected and select Next

Multi-Speed_Pro__Selected_.png   Multi-Speed_Caution.png   rconly.png

You will then be presented with this screen asking you to select your fan system:

Multi-Speed__Single_Speed_.png

  • If you have one G wire, select Single or Variable Speed Fan
  • If you have multiple G wires, select Multi-speed fan
  • If you have multiple G wires and pipe sensor wires such as S1 and S2, select Multi-speed fan and pipe sensor

 

  • Confirm the wiring configuration is correct and select Yes if correct.
  • If you need to make changes, select No and then select Modify
  • Proceed through the rest of the configuration wizard

 

 

  • Confirm the wiring configuration is correct and select Yes if correct. If you need to make changes, select No and then select Modify
    (note that multi-purpose terminals will be highlighted in yellow)
  • Configure the wires used in the multi purpose terminals. Select G2 if a medium-speed fan wire is in the Y2 terminal, and select G3 if a high speed fan wire is in the W2 terminal. When you are finished, select Next
  • Proceed through the rest of the configuration wizard until you are asked about the type of fan coil your building has
  • If a W1 wire was selected, select either 2 pipe fan coil unit or 4 pipe fan coil unit, and then select Next
  • If 2 pipe fan coil was selected and a W1 wire was selected, select either Fan Coil Heat or AUX Heat Source to configure your W1 wire source then select Next
  • Proceed through the rest of the configuration wizard

 

Multi-Speed_Detected_Wires.png   W2_Selected_.png   Multi-Speed_Fan_Coil__2_Pipe_.png   w1source.png

 

  • Confirm the wiring configuration is correct and select Yes if correct. If you need to make changes, select No and then select Modify
    (note that multi-purpose terminals will be highlighted in yellow)
  • Configure the wires used in the multi purpose terminals. Select G2 if a medium-speed fan wire is in the Y2 terminal, and select G3 if a high speed fan wire is in the W2 terminal. When you are finished, select Next
  • Proceed through the rest of the configuration wizard until you are asked about the W1 wire
  • Select either Fan Coil Heat or AUX Heat Source to configure your W1 wire source then select Next
  • Select Heating if your building is currently in heating mode, or Cooling if your building is currently in cooling mode, and tap Next
  • Proceed through the rest of the configuration wizard

Aquastat_Detected_Wires.png   W2_Selected_.png   w1source.png   heatingorcooling.png

 


 

Operation

 

Setting Fan Speed

You can adjust your fan's speeds settings via the System menu. On the thermostat screen, tap the Main Menu icon and then tap System.

fanspeed.png   fanspeed2.png

From here, tap Fan Speed to adjust the fan speed setting:

  • Optimized will automatically adjust the fan speed heating/cooling/fan calls
  • Low will always run the fan at low fan speed
  • Med will always run the fan at medium fan speed
  • High will always run the fan at high fan speed

 


 

Troubleshooting

I don't see the "I'm a pro" option!

If you do not see the "I'm a pro" option, your ecobee likely needs a firmware update, as multi-speed fan support requires a firmware version of at least 4.6.3.X or higher.

You can verify your ecobee's firmware version by navigating to Main Menu > About. If your firmware version is not at least 4.6.3.X, please reach out to ecobee support to request an upgrade.

Once you've verified the firmware version is up to date, you can reconfigure your ecobee by doing the following:

  1. On the thermostat screen, select the Main Menu icon in the bottom left
  2. Select Settings
  3. Select Installation Settings
  4. Select Equipment
  5. Select Reconfigure Equipment

 

I'm installing my ecobee for the first time and I do not see the "I'm a pro" option!

If you are configuring your ecobee for the first time during a new installation, you will need to proceed through the initial configuration wizard until the option to connect to Wi-Fi is present. 

  1. Select Yes, only RC is connected and select Next
  2. Skip the wiring configuration screen by selecting Yes
  3. Skip through the rest of the configuration until you are asked to connect to Wi-Fi
  4. Connect the ecobee to Wi-Fi through the menu
  5. Once the registration code generates, tap Finish

Once you have connected the ecobee to Wi-Fi and ecobee.com, a firmware update should begin downloading. This process can take upwards to ten minutes. Once the upgrade has downloaded, the thermostat will momentarily reboot.

Once the thermostat reboots, verify the firmware version by navigating to the About screen (Main Menu > About). Your firmware version should now be listed as 4.6.3. or higher.

Once you've verified the firmware version is up to date, you can factory reset your ecobee by doing the following:

  1. On the thermostat screen, select Main Menu in the bottom left
  2. Select Settings
  3. Select Reset
  4. Select Reset All

You should now be taken back to the initial configuration screen

 

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