Siemens DDC R540-103 Controller R-410A 6" pitch diameter when paired

6" pitch diameter when paired with B-belts

Incorporating this replacement water temperature sensor ensures the boiler operates at peak thermal efficiency by allowing the integrated logic to adjust firing rates based on real-time outlet conditions

Field Ready: Includes a factory-integrated 20-foot shielded cable to reduce installation labor

leading to false readings

This scanner is designed for fossil fuel flames such as natural gas

Siemens DDC R540-103 Controller R-410A 6" pitch diameter when pairedThe Siemens R540 103 is a precision engineered constant volume controller designed for integration into Siemens DDC HVAC systems. As a refurbished unit equivalent to the 540 103N, it serves as a critical component for maintaining stable airflow in commercial ventilation and air handling applications. This direct digital control unit manages airflow by ensuring a steady output against varying duct static pressures, making it essential for building