ecobee

How to control your HVAC system's fan with your ecobee thermostat

Applies to ecobee3, ecobee3 lite, and ecobee4

 

The ecobee thermostat can control your fan in a variety of ways to maximize your comfort. Below we explain the five methods available.

 

You can choose either the ecobee thermostat or your furnace to control your system fan during heating cycles. The ecobee will operate your system fan differently than your furnace during heating cycles.

 

To adjust this setting, go to MAIN MENU > SETTINGS > INSTALLATION SETTINGS > EQUIPMENT > FURNACE > FAN CONTROL IN HEAT MODE

 

*Please note this option is only accessible through the thermostat interface. Neither the mobile apps or Web Portal provide access to adjust this option.

 

 

 

Set to "ecobee thermostat:" By choosing this option, the ecobee will energize the fan directly during heating cycles. This will cause the fan to immediately turn on when a heating cycle is initiated, and continue to run until the heating cycle ends.

Set to "HVAC:" By choosing this option, the ecobee will relinquish control of the fan to the furnace during heating cycles. In this case, there will usually be a brief delay before the fan engages after a heating cycle is initiated. This option is recommended if you have variable fan speed furnace.

This feature allows you to define the minimum amount of time each hour that the system fan will run. This feature is useful if you wish to circulate the air throughout your home automatically outside of heating or cooling cycles.

The ecobee will divide the "Fan Min On time" you select throughout each hour. If the Fan Min On Time is set for 15 minutes or lower, the fan will operate in two separate segments across the hour; if the Fan Min On Time is set for 20 minutes or higher, the fan will run in four equal segments across the hour.

If a heating or cooling cycle operates within any given hour, the length of either cycle will be deducted from the Fan Min On Time. For example, if your cooling runs for 5 minutes and your Fan Min On Time is set to 20 minutes, 5 minutes will be deducted from the Fan Min On Time.

To adjust this setting go to MAIN MENU > SYSTEM > FAN

 

 

Auto mode: The fan will only engage on calls for heating/cooling, or to meet the fan minimum on time.

On mode: The fan will run constantly until the mode is switched back to auto.

heat-diss-1.png cool-diss-1.png

MAIN MENU > SETTINGS > INSTALLATION SETTINGS > THRESHOLDS > HEAT/COOL DISSIPATION TIME

The amount of time after a call for heating or cooling that the fan will continue to run. This is set to “auto” by default, meaning that the furnace will decide when to disengage the fan after a heating or cooling call. The furnace may continue to run the fan for several minutes after a call for heating or cooling to expel any hot or cold air remaining in the ducts.

If set to "0," the fan will turn off as soon as a call for heating or cooling has concluded.

*Please note this option is only accessible through the thermostat interface. Neither the mobile apps or web portal provide access to adjust this option.

The ecobee also has the ability to control the fan mode for specific Comfort Settings such as Home, Away, and Sleep.

 

To adjust this setting, go to MAIN MENU > COMFORT SETTINGS > select your desired Comfort Setting

 

cs-fan.png

 

In “on” mode, the fan will run constantly for the duration of this Comfort Setting.


In “auto” mode, the fan will only run during calls for heating or cooling for the duration of this Comfort Setting. The fan will also run to meet the Fan Minimum On Time requirement.

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