The Belimo CR24-A1 room controller offers an economical solution for individual temperature control in a single room. It is suitable for VAV applications and 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 changeover. In changeover operation, the output can be used either as a common output for cooling/heating or exclusively for cooling or heating.

Energy Barrier

This is a function 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 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.

In Case of Frost

If the room temperature drops below 10 °C, the frost protection is activated.

Changeover

The changeover operation allows you to select a common output for both heating and cooling, or to designate it exclusively for one of the options.

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.