Belimo Lfx24-sr Us Damper Actuator 35 In-lb Spring Return

Product Description

The BELIMO lfx24-sr us is a spring-return damper actuator designed for precise modulating control in commercial and residential HVAC systems. It delivers 35 in-lb of torque and operates on AC/DC 24 volts with a 2 to 10 volt modulating control input, allowing proportional positioning across the full stroke. The spring-return mechanism drives the actuator to its fail-safe position on loss of power, an essential safety feature in ventilation, exhaust, and mixed-air damper applications. Licensed HVAC technicians and building automation contractors are the primary installers of this actuator type.

This actuator is suited for use on multi-blade dampers in air handling units, ventilation systems, and building automation applications where proportional control is required. The 150-second runtime allows smooth, controlled damper movement that minimizes system pressure spikes. Its spring-return function makes it appropriate for outdoor air and exhaust dampers where fail-safe closure or opening is required by design or code. Both commercial and light industrial HVAC installations commonly use actuators of this type.

Key Features

• 35 in-lb rated torque for reliable damper blade actuation
• Spring return provides automatic fail-safe positioning on power loss
• AC/DC 24-volt operation for compatibility with standard low-voltage control circuits
• 2 to 10 volt modulating input for proportional damper positioning
• 150-second stroke runtime for smooth, controlled operation

Compatibility

Designed as an OEM-style replacement or new-installation actuator for multi-blade HVAC dampers requiring spring-return, modulating control at 24 volts.

Installation Notes

Installation should be performed by a licensed HVAC technician or controls contractor familiar with low-voltage building automation wiring. Disconnect and lock out all power to the air handling unit and control panel before mounting or wiring the actuator. Verify damper blade torque requirements do not exceed the actuator rating before securing the unit. Follow local mechanical and electrical codes, including ASHRAE and NEC guidelines, when integrating into a building automation system.

Technical Specifications

• Actuator Type: Damper
• Control Input: Modulating 2 to 10 volt
• Torque: 35 in-lb
• Voltage: AC/DC 24 volts
• Spring Return: Yes
• Stroke Runtime: 150 seconds

Standard Information

• Brand: BELIMO
• Manufacturer Part Number: lfx24-sr us