Belimo LRB24-SR-T Motor Actuator

The Belimo LRB24-SR-T is a high-performance non-spring return actuator designed specifically for the precise control of HVAC cold and hot water systems. Operating on a 24Vac/24Vdc power supply, this proportional control actuator delivers a reliable 45 in-lb torque, making it a staple for contractors managing damper and valve regulation in Building Automation Systems (BAS). Featuring a 2-10 Vdc control signal (expandable to 4-20 mA with a 500 ohm resistor), this unit ensures seamless integration with standard modulating control circuits.

The LRB24-SR-T is built with a brushless DC motor, significantly reducing power consumption to just 1.5W during operation while providing electronic overload protection across the entire 0° to 90° rotation. The inclusion of a terminal strip (screw terminals) facilitates faster field wiring compared to cable-only models. With its NEMA 2 rated housing and suitability for air plenum applications, this damper actuator is engineered for longevity and maintenance-free service in demanding commercial environments.

• Precision Control: Utilizes 2-10 Vdc feedback and input signals for accurate modulating positioning in hydronic and air systems.
• Power Efficiency: Advanced brushless DC motor technology minimizes transformer sizing requirements (3 VA).
• Field Flexibility: Features a manual override pushbutton and a selectable direction-of-rotation switch for expedited setup and testing.
• Rugged Construction: Designed for an ambient temperature range of -22°F to 122°F, ensuring performance in variable climate conditions.
• Contractor Friendly: The terminal block connection (supports 26 to 14 AWG) simplifies wiring without the need for additional junction boxes.

Can the LRB24-SR-T be used for 4-20 mA control signals?
Yes, by installing an external 500 ? resistor (ZG-R01) across the input terminals, the 2-10 Vdc signal can be converted to accept 4-20 mA proportional control.

What is the typical running time for this actuator?
The motor provides a constant 90-second run time for a full 90-degree rotation, ensuring stable pressure control in the system.

Is this model fail-safe?
No, the LRB24-SR-T is a non-spring return (non-fail-safe) actuator. It will maintain its last position upon loss of power.

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.