Belimo LF120 Actuator Motor

The Belimo LF120 is a specialized spring-return actuator engineered for on/off control in commercial HVAC systems. Delivering 35 in-lb (4 Nm) of torque, this motor is designed to operate damper areas up to 8.5 sq. ft., providing a mechanical fail-safe in the event of power loss. Operating on a 120V AC power supply, it features brushless DC motor technology controlled by an application-specific integrated circuit (ASIC), ensuring precise performance and reduced power consumption. The NEMA 2 (IP54) rated housing allows for versatile installation, while the universal clamp accommodates square or round shafts from 3/8" to 1/2". The internal mechanical end-of-stroke adjustment allows for field-configurable rotation limits, and the integrated manual override simplifies commissioning and troubleshooting for field technicians.

Technical Benefits

• Fail-Safe Reliability: Reliable spring return mechanism ensures dampers return to the safety position during power interruptions.
• Simplified Installation: Universal spindle clamp and anti-rotation bracket streamline mounting on various damper shafts.
• Consistent Torque: Provides 35 in-lb of torque across the entire rotation range for predictable damper modulation.
• Low Maintenance: Brushless motor design eliminates the need for periodic maintenance and extends operational life.
• Overload Protection: Optimized electronic stall detection prevents motor burnouts without the need for limit switches.

Common Installation Questions

How do you change the rotation direction on a Belimo LF120?
Technicians can reverse the spring return direction by flipping the actuator over. The "R" and "L" indicators on the housing denote the clockwise or counter-clockwise fail-safe rotation.

What is the typical run time for the LF120 motor?
The motor run time is approximately 40 to 75 seconds, while the spring-return timing typically closes the damper in less than 25 seconds at room temperature.

Can the LF120 be used in outdoor applications?
While rated NEMA 2, this actuator requires a weather shield if exposed to direct rain or high-pressure wash-down environments to maintain internal electrical integrity.

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.