With two potential-free switch contacts. The switching contact opens when the set temperature is reached. It has an external input for switching between heating and cooling (230 V). Without expansion mounting. When operating in cooling mode, care should be taken to avoid condensation on the cooled surface in high humidity conditions (risk of thunderstorms). Cooling should be reduced or completely turned off in a timely manner to prevent damage to the cooled surface from moisture. After commissioning, the switching point accuracy is achieved after approximately 1-2 hours of operation. To shorten the initial adjustment period, it is recommended to initially set the desired temperature higher (heating mode) or lower (cooling mode) than intended. For connection to hot water heating systems, the controller requires normally closed actuators. Installation in flush-mounted boxes according to DIN 49073 is required. Platforms: Busch-Duro 2000 SI, Reflex SI, Busch-balance SI, Busch-art linear, future linear, Busch-axcent, solo, pur stainless steel, carat, Busch-dynasty, alpha.