KNX Heating Actuator 4-channel, 2 SU MDRC, 24 – 230 V AC. Heating Actuator to control electrothermal drives, with LED indicator per channel. New generation with extended functionality. Each channel can control up to 4 valve drives (230 V AC). Free assignment of the outputs to the controller channel. Control with 1 Bit (Switch/PWM) / 1 Byte (continuous) control variables or direct control with temperature value over the KNX Bus. Integrated PI temperature controller (heating and cooling). Comfort-, night-, frost protection mode. summer-/winter operation. Setpoint setting adjustment with 1 Bit +/-, 1 Byte or 2 Byte absolute object. Independent setpoint setting for comfort, standby and night. Setpoint storage in the event of a bus power failure. Emergency operation on failure of the control value. Overload protection with fault message object (230 V AC). Error message via object in case of supply voltage failure. Heating request object as well as a valve anti-stick object. Comprehensive scene functions. Compatible with many visualisations. Minimum flow temperature. Clear text diagnostics for each channel with a 14 Byte object. Fast application download (long frame support as of ETS 5). 3 year warranty.