Belimo LRB24-3-S Actuator

The Belimo LRB24-3-S is a high-torque, non-spring return actuator engineered for precise control of ball valves in HVAC systems. Delivering 45 in-lb of torque, this 24V unit supports on/off and floating point control across 24VAC/DC power inputs. It features an integrated SPDT auxiliary switch for position signaling or safety interlocking. As the manufacturer-designated direct replacement for LR24-3-S and LR24-S models, it ensures seamless mechanical and electrical backward compatibility. The brushless DC motor is controlled by an Application Specific Integrated Circuit (ASIC) to provide constant torque and overload protection throughout its 95-degree stroke. A manual override button facilitates easy setup and emergency positioning. The MFT (Multi-Function Technology) architecture ensures reliable operation in demanding commercial hydronic systems, reducing hunt and maintaining stable valve positioning under varying differential pressures.

• Universal Compatibility: Operates on both 24VAC and 24VDC for flexibility in various control circuits.
• Enhanced Control: Integrated auxiliary switch (1x SPDT) allows for precise end-stop verification or equipment sequencing.
• Serviceability: Manual override button allows technicians to manually position the valve during commissioning or power loss.
• Direct Replacement: Specifically designed to replace legacy LR24-3-S and LR24-S actuators without piping modifications.
• Performance Reliability: Electronic stall detection prevents motor burnout if the valve path is obstructed.

How do I wire the LRB24-3-S for floating point control?
This actuator utilizes three-wire control where one common wire and two hot wires dictate the direction of rotation. Applying power to specific terminals drives the motor clockwise or counter-clockwise.

Is this actuator suitable for steam applications?
The LRB24-3-S is primarily designed for water-based hydronic systems using CCV ball valves. Verify your valve's media temperature rating before installation in high-temperature environments.

Does this unit require end switches to stop the motor?
No, the actuator uses internal electronic sensing to detect the end of stroke or any physical stall, automatically cutting power to protect the gear train.

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.