The Belimo CR24-B1 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 four inputs and one output, which can be selected either for Belimo VAV control or as a change over. In change over operation, the output can be used either as a common output for cooling/heating or exclusively for cooling or heating.

The desired temperature can be set and the mode switched on the controller using the control wheel. The status indicator with an LED shows which mode is currently selected.

Energy Override

This is a feature of the energy efficiency of the controller, 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 to be unnecessarily heated or cooled, yet still ensures the safe preservation of plants, paintings, and others. The heating value is significantly reduced (15 °C), while the cooling value is strongly increased (40 °C).

Standby Function

This function is suitable for rooms that are used only occasionally or are temporarily vacated. 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.

In Frost

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

Change Over

The change over operation allows you to select an output common to both heating and cooling, or to designate it exclusively for one option.

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 Desired Temperature Change

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