Operating modes: Comfort, Energy Saving and Protection 2-position, 3-position or PWM control outputs Automatic or manual fan speed 3 multifunctional inputs for keycard contact, external room / return air temperature (QAH11.1, QAA32), heat / cool changeover, operation mode changeover, window contact on/off, dewpoint monitor, electrical heater enabled, fault contact Automatic or manual heating / cooling changeover Adjustable commissioning and control parameters Minimum and maximum setpoint limitation Backlit display Application selectable: 2-pipe system 2-pipe system with electrical heater 2-pipe system and radiator / floor heating 4-pipe system 4-pipe system with electrical heater 2-stage heating or cooling system