Müller KNX 24704 Room Climate Controller with Air Quality, Temperature and Humidity Sensor GS 40.12 KNX

Room climate controller with integrated KNX bus connection that combines temperature, humidity and CO2 measurement in a single flush-mounted device. The controller regulates heating, cooling, ventilation and dehumidification using a PI algorithm, with two binary inputs for window contacts or presence detectors. Operating modes include Comfort, Standby, Night and Frost/Heat Protection. The device is powered directly from the KNX bus (21-30V DC) and consumes a maximum of 10 mA. Configuration requires ETS5 or higher. Integrated logic functions allow local automation without additional components.

Advantages

All-in-one sensor and controller reduces wiring and installation time. PI control ensures stable room temperature. CO2 measurement enables demand-based ventilation. Two binary inputs integrate window status or occupancy. Bus-powered design eliminates separate power supply.

Suitable for

• Residential and commercial buildings with KNX infrastructure
• Rooms requiring automatic climate control based on air quality
• Retrofit projects where flush-mounted devices are preferred
• Integration with window contacts or presence detectors

Key specifications

• Bus system: KNX
• Integrated sensors: Temperature, humidity, CO2
• Temperature measurement range: 0 to +50 °C
• Humidity measurement range: 0 to 100 % RH
• CO2 measurement range: 0 to 2000 ppm
• Control functions: Heating, cooling, ventilation, dehumidification
• Control type: PI controller (1-stage / 2-stage)
• Operating modes: Comfort, Standby, Night, Frost/Heat Protection
• Binary inputs: 2
• Current consumption: Max. 10 mA
• Mounting: Flush-mounted
• Colour: White

Recommendations

For KNX projects requiring a compact room controller with air quality monitoring, this device offers precise measurement and flexible control. Ensure ETS5 or higher is available for commissioning. The flush-mounted design fits standard switch boxes, making it suitable for new installations and retrofits.