Modbus communications For heating and/or cooling applications 2 or 3-position control outputs Output for 1-speed or 3-speed fan 2 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 Operating modes: Comfort, Economy and Protection Automatic or manual heating/cooling changeover Adjustable commissioning and control parameters Minimum and maximum setpoint limitation Color of housing: signal white (RAL 9003) Backlit display Application selectable: 2-pipe system 2-pipe system with electrical heater 4-pipe system