Advanced Device Configuration

Control4 has enhanced the available thermostat settings to allow users and installers to modify engage and cutoff temperature deltas—as well as maximum and minimum run time, off, and delay times—so that the thermostat can be configured to run optimally with any HVAC system.

Note: Allowing such fine tuning of all settings can result in setting improper values and combination of values to cause the HVAC system to run less than optimal. To prevent thrashing the cool and heating engage (constant heat, then cool, engagement), cutoff and set points are enforced to have at least a one degree difference for engage temperatures.

The formula for the dependency of these values is:

Heat/cool engage delta—Opposite stage (if heat engage, then cool cutoff and visa versa) cutoff delta + set points delta (cool set point – heat set point) >=1

The screen below shows the Advanced Device Configuration properties. 

  • Temperature Calibration—Use the up or down arrows to set x degree(s), and then click Set Calibration. This lets you fine tune the current temperature reported by the thermostat by +/- 5 degrees. Example: If your thermostat reads 72 degrees Fahrenheit, and you determine that the current temperature should be 70 degrees Fahrenheit, press the down button two times to lower the thermostat’s reading to 70 degrees Fahrenheit. Click Set Calibration.

    • Note: No changes to calibration should be made within 20 minutes of powering on the thermostat. The thermostat generates a small amount of heat which affects the calibration. After 20 minutes of continuous operation, this will stabilize allowing proper calibration.

  • Heating Cutoff Point—Use the up or down arrows to set x degree(s) from the set point, and then click Set Heat Cutoff. This sets how far over the setpoint you want the heating system to remain engaged before shutting off. Example: If the heat set point is set to 68 degrees Fahrenheit and the cutoff point is set to 2 degrees Fahrenheit, the heating system will engage until reaching 70 degrees.
  • Cooling Cutoff Point—Use the up or down arrows to set x degree(s) from the set point, and then click Set Cool Cutoff. This sets how far under the setpoint you want the cooling system to remain engaged before shutting off. Example: If the cool setpoint is set to 68 degrees Fahrenheit and the cutoff point is set to 2 degrees Fahrenheit, the cooling system will engage until reaching 66 degrees.
  • Stage Minimum Off Time (Minutes)—Use the up or down arrows to set the minimum off time in minutes. Note: This setting takes effect as soon as the Advanced Device Configuration box is closed.

    • This is the minimum amount of time that the heating or cooling will remain off before initiating again. Example: If while cooling, the temperature does not reach the designated cutoff point before the maximum run time is reached, the cooling system will shut off and not initiate cooling again until the Minimum Off Time is reached. Note: Some HVAC systems automatically enforce a Minimum Off Time. In this case, the heating or cooling will remain off for the higher of the two settings (thermostat or HVAC system).

    Stage Configuration (Heat Stage 1, 2; Cool Stage 1, 2; Auxiliary; Emergency)

    The stage configuration boxes allows for setting the engage delta, minimum run time and maximum run time for each stage.

    Note: These settings take effect as soon as the Advanced Device Configuration box is closed.

  • Delta (degrees)—Use the up or down arrows to set the stage engage temperature delta. This sets how many degrees the current temperature will reach beyond the setpoint before the stage engages.

    • Example:

    For heat, if the heat setpoint is 70 degrees Fahrenheit and the engage delta is 2 degrees Fahrenheit, the heat stage will engage when temperature reaches 68 degrees.

    Note: For multi-stage systems, the deltas for the first and second stages are cumulative. If the first stage delta is set at 2 degrees Fahrenheit and the second stage delta is set at 2 degrees Fahrenheit, the second stage will not engage until the current temperature has passed the stage setpoint by 4 degrees Fahrenheit. However, the Auxiliary Heat and Emergency Heat deltas are NOT cumulative.

  • Minimum Run Time—Use the up or down arrows to set the stage x minimum run time in minutes. The minimum run time is one minute. This sets the minimum time the heating and cooling will run before shutting off. Example: If while cooling or heating, the temperature reaches the designated Cutoff Point before the Minimum Run Time is reached, the system will not shut off until the Minimum Run Time is reached. Also, if heat or cool is engaged and shut off manually, the system will not shut off until the Minimum Run Time is reached. Note: Some HVAC systems have built-in Minimum Run Times that may be greater than that set on the thermostat.
  • Maximum Run Time—Use the up or down arrows to set the Heat Stage x maximum run time in minutes. The maximum run time is 255 minutes. This sets the maximum time the heating or cooling will run before turning off. Example: If heating or cooling is engaged, but does not reach the Cutoff Point before the Maximum Run Time is reached, the cooling system will turn off. Note: The Maximum and Minimum Run Times are not per stage, but for cooling and heating run times regardless of first or second stage transitions.

Auxiliary Stage

The Auxiliary and Emergency Heat stages are specifically for heat pump systems. The switches on the back of the thermostat allow the thermostat to operate a heat pump system.

Note: These settings take effect as soon as the Advanced Device Configuration box is closed.

  • Stage Delay (Minutes)—Use the up or down arrows to set the stage delay for x minutes. This sets the allotted time the main heat pump system will run without reaching the desired heat setpoint goal before the Auxiliary stage engages. Note: If set to the maximum time allowed, the auxiliary system will be disabled and never engage.
  • Stage Cutoff Delay (seconds)—Use the up or down arrows to set the stage cutoff delay in seconds. This sets how much of a delay before the main heat pump cuts off, leaving the Auxiliary heating stage to run on its own. Note: If set to the maximum time allowed, the main heat pump stage and the Auxiliary heat stage will run together indefinitely.