Belimo LF24-SR-E Actuator Motor

The Belimo LF24-SR-E is a high-torque spring return actuator engineered for precise control in HVAC systems requiring fail-safe performance. Operating on a 24Vac/dc power supply, this proportional damper actuator provides 35 in-lb (4 Nm) of torque, making it a reliable solution for modulating control of dampers in air handling units and economizer applications. The unit features a 2-10Vdc control signal and includes a built-in minimum position potentiometer (MinPos), which allows technicians to establish a baseline airflow setting without additional external components. Its brushless DC motor technology ensures long-term reliability and precise positioning, while the mechanical spring return mechanism guarantees a defined fail-safe position during power loss. Designed for easy installation, the LF24-SR-E actuator supports direct mounting on shafts up to 3/4 inch, facilitating rapid field replacement or new equipment integration in demanding commercial environments.

Key Benefits

• Fail-Safe Reliability: Reliable mechanical spring return ensures dampers return to a safe position during power interruptions.
• Precise Modulation: Provides accurate 2-10Vdc modulating control for optimized airflow management.
• Integrated MinPos Control: Features an onboard potentiometer for setting minimum ventilation requirements efficiently.
• Versatile Compatibility: Functions with both 24Vac and 24Vdc power sources for flexible field installation.
• Robust Torque Output: Delivers consistent 35 in-lb of torque suitable for smaller dampers and economizer sections.

Common Questions

What is the purpose of the MinPos dial on the Belimo LF24-SR-E?
The minimum position (MinPos) potentiometer allows contractors to set a fixed minimum opening for the damper, ensuring baseline fresh air intake or pressure maintenance even when the control signal is at its lowest point.

Can this actuator be used in place of an LF24-SR?
Yes, the 'E' suffix typically denotes the economizer version which includes the minimum position adjustment, making it a functional upgrade or direct replacement for standard LF24-SR units in those specific applications.

How do I change the direction of the spring return?
The fail-safe direction (clockwise or counter-clockwise) is determined by the orientation of the actuator on the shaft. Technicians flip the unit over to choose the desired return rotation during mounting.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.