Automatic operation mode requires the installation of a sensor module (accessory). Please note that additional assembly is only possible from the serial number 743711700. The use of the automatic function is based on the logic of the necessity-based regulation and serves the purpose of optimising the climate of the room and, consequently, improving the comfort and quality of life in the dwellings. At the same time, the optimal ventilation conditions in line with the ambient are achieved, which ultimately ensures greater energy savings.