Athene B4 Square Thermostat Athene B4 Square Thermostat Athene B4 Square Thermostat is designed for both, combination usage as well as individual usage. The combination includes the one with push buttons to control HVAC system and KNX-Conventional Lighting Shutter Systems etc. Features Temperature Sensor Humidity SensorHeating ControlCooling Control2Points, PWM, PID ControlComfort, Standby, Night and protection ModesSpecial HVAC modes for AC ControlOn/Off ButtonFan Control ButtonSetpoint Control ButtonsLogic GatesKNX Datapoint Converter