Belimo LMX24-SR-T Damper Actuator 45 In-lb 24V Modulating

Product Description

The BELIMO LMX24-SR-T is a non-spring return damper actuator rated for 45 in-lb of torque, designed for modulating control of HVAC dampers in commercial and residential air handling systems. It operates on 24 VAC or 24 VDC power supply and accepts an analog control signal for precise proportional positioning. With a compact, direct-coupled design, this actuator mounts directly to damper shafts without the need for crank arms or linkage in most applications. The NEMA 2 and IP54 enclosure ratings provide protection against dripping water and dust, making it suitable for a range of mechanical room and air handling unit environments. HVAC technicians and mechanical contractors install this unit as part of VAV, mixed-air, and economizer control sequences.

The LMX24-SR-T is suited for use in commercial HVAC systems where modulating damper control is required. Typical applications include outside air, return air, and exhaust air dampers in air handling units, rooftop units, and built-up systems. Its analog input allows integration with DDC building automation systems and standalone controllers that output a modulating signal. Because this is a non-spring return actuator, the damper position is held by motor torque rather than a return spring, which is appropriate for applications where fail-in-place behavior is acceptable.

Key Features

• 45 in-lb rated torque for direct-coupled damper control
• Non-spring return design holds position on power loss
• Accepts analog control signal for modulating proportional positioning
• Operates on 24 VAC or 24 VDC power supply
• NEMA 2 and IP54 enclosure rating for moisture and dust resistance
• Low 3 VA power draw minimizes transformer loading

Compatibility

Designed as an OEM-style replacement or new-installation actuator for HVAC damper assemblies requiring a 45 in-lb non-spring return modulating actuator with a 24-volt supply.

Installation Notes

Installation should be performed by a licensed HVAC technician or mechanical contractor familiar with low-voltage control wiring and damper actuator mounting procedures. Disconnect and lock out all power to the air handling unit and control panel before beginning installation or wiring. The actuator should be mounted directly to the damper shaft per the manufacturer mounting instructions, ensuring the shaft clamp is fully secured before restoring power. Verify control signal wiring and supply voltage against the building automation system output specifications before commissioning.

Technical Specifications

• Torque: 45 in-lb
• Power Supply: 24 VAC, 24 VDC
• Supply VA: 3 VA
• Control Signal: Analog (Modulating)
• Spring Return: Non-Spring Return
• Enclosure Rating: NEMA 2, IP54

Standard Information

• Brand: BELIMO
• Manufacturer Part Number: LMX24-SR-T