The Belimo CR24-A2 room controller offers an economical solution for individual temperature control in a single room. It is suitable for VAV applications as well as combined 2 and 4 pipe systems. It features five inputs and two outputs. The outputs can control one or more VAV controllers and heating using a 3-point signal.

Energy Override

This is a feature of the controller's energy efficiency, where it will heat the room only to its protective level. This function is particularly suitable during periods when the room is not in use and does not need unnecessary heating or cooling, yet still ensures the safe preservation of plants, paintings, and others. The heating value is significantly reduced (15 °C), while the cooling value is greatly increased (40 °C).

Standby Function

This function is suitable for rooms that are used only occasionally or are temporarily unoccupied. The heating and cooling values are only slightly adjusted to reduce costs, while still allowing the room temperature to be quickly brought to the desired state.

Frost Protection

In the event of the room temperature dropping below 10 °C, frost protection is activated.

Ventilation

Allows the room to be ventilated with maximum air flow. This is particularly suitable for quick airing during long meetings, in hotel rooms, and others.

External Temperature Sensor

An external sensor can be connected to the ai1 input of the controller to measure the average room temperature in the ventilation duct. 

External Setpoint Change

The ai2 input can be used for changing the temperature setpoint via an external 0...10 V signal. This function is used for summer/winter compensation.

Airflow During Heating

In heating mode, it allows increased airflow. This is required, for example, in heating with an air heater. The function also improves air quality when heating is on.