The Siemens RDF800KN is a sophisticated flush-mount room thermostat designed for seamless integration into modern building automation systems via KNX communication. It provides precise temperature control for a wide range of applications, including 2-pipe and 4-pipe fan coil units, as well as chilled and heated ceilings. Featuring a large, easy-to-read backlit LCD, the RDF800KN displays the current room temperature, setpoint, and operating mode. It supports multiple control outputs (On/Off, PWM, 3-position) and includes a multifunctional input for enhanced flexibility, such as connecting a keycard contact or an external sensor. With its sleek design and advanced functionality, including Comfort, Economy, and Protection modes, the RDF800KN is an ideal solution for optimizing comfort and energy efficiency in commercial and residential buildings.