Individual room control, silent, 400W. Solid-state relay not potential-free. Standby loss only 0.8 watts. Encrypted radio, bidirectional radio and repeater function can be switched on. For built-in installation. 45mm long, 45mm wide, 33mm deep. When the load = target temperature, it is switched off. When the actual temperature = target temperature, it is switched off. When the actual temperature <= (target temperature - hysteresis), it is switched on at 100%. If the actual temperature is between the target temperature - hysteresis and the target temperature, it is switched on and off in 10% increments using a PWM depending on the temperature difference. The smaller the temperature difference, the shorter the switch-on time. The adjustability of the 100% value means that the PWM can be adapted to the size of the radiator or inertia. In cooling mode, the signs are reversed. In heating mode, the frost protection function is always active. As soon as the actual temperature falls below 8°C, the selected operating mode regulates to 8°C. As long as one or more windows are open, the output remains off, provided that window-door contacts FTK or Hoppe window handles have been programmed. In heating mode, however, frost protection remains active. As long as all programmed FBH motion detectors have not reported any movement, the system switches to setback mode. In heating mode, the target temperature is reduced by 2°, in cooling mode it is raised by 2°. As soon as a motion detector reports movement again, the system switches to normal mode. If a radio button has been programmed, the 4 buttons are permanently assigned the following functions: Top right: normal operation (can also be activated using a timer). Bottom right: night-time setback mode by 4°, in cooling mode, temperature is raised by 4° (can also be activated using a timer). Top left: Reduced temperature by 2°, increased temperature by 2° in cooling mode. Bottom left: Off (frost protection active in heating mode, permanently off in cooling mode). If a motion detector and a radio button are programmed at the same time, the last received telegram is always valid. A motion detector switches off a reduced temperature selected with the radio button when movement is detected. If bidirectional radio is activated, the FHK61 sends a confirmation telegram with its own ID with the current