Belimo LF24-3-S Actuator Motor

The Belimo LF24-3-S is a high-torque spring return actuator designed for the reliable operation of small up to medium-sized dampers in HVAC systems. Delivering 35 in-lb [4 Nm] of torque, this motor utilizes a floating point control signal or on/off control compatible with 24VAC or 24VDC power supplies. Engineered for fail-safe applications, the mechanical spring return ensures the damper returns to a safe position during power loss. This model features an integrated SPDT auxiliary switch, adjustable from 0 to 95 degrees, providing essential feedback or interlocking for peripheral equipment. The brushless DC motor is microprocessor-controlled, ensuring precise timing and constant torque throughout its stroke, regardless of load. Designed for ease of installation, it supports direct mounting via a universal clamp, reducing field labor. Contractors rely on the LF series for its robust construction, low power consumption, and consistent performance in demanding airflow control environments.

• Fail-Safe Reliability: Mechanical spring return guarantees damper closure or opening during power interruption for critical safety.
• Precise Control: Floating point 3-point control allows for accurate damper positioning in modulating airflow applications.
• Integrated Monitoring: Built-in SPDT auxiliary switch enables external signaling without requiring additional field-mounted components.
• Universal Compatibility: The 24V AC/DC architecture integrates seamlessly with most building automation systems and DDC controllers.
• Reduced Maintenance: Brushless DC technology eliminates common motor wear points, extending the duty cycle in continuous operation.

What is the maximum damper area the Belimo LF24-3-S can drive?
This actuator provides 35 in-lb of torque, typically sufficient for dampers up to 8 square feet, though actual sizing depends on damper construction and air velocity.

Can I adjust the auxiliary switch setting in the field?
Yes, the auxiliary switch is fully adjustable between 0 and 95 degrees to provide flexibility for custom interlocking requirements.

How do I reverse the fail-safe direction?
The direction of the spring return is determined by the orientation of the actuator on the shaft; simply flip the unit over to change from normally open to normally closed.

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.