System 3000 room temperature controller, stainless steel display, System 55 - Operation via capacitive sensor surface. - Manual and time-controlled control of the room temperature. - Current time can be saved as a switching time, quick programming. - Automatic summer/winter time changeover, can be switched off. - Timer with three memory areas per memory area, comfort and setback times for Mon-Fri and Sat+Sun. - Setting a comfort, setback, cooling and frost protection temperature. - Controller output: pulse width modulation (PWM) or 2-point control. - Heating optimization (temperature is reached at the set time). - Adaptation to valves (normally open or normally closed). - Activation of cooling mode via the insert. - Supports internal and external temperature sensors. - Temperature drop detection. - Operating lock. - Valve protection function. - Display switches off after 2 minutes, permanent display of the current time possible. - The combination of attachment 5394xx with 540700 is only possible from I05 (index).