BELIMO LMU 24-SR 5NM 24VAC/DC 150S
The BELIMO LMU24-SR 5NM is a high-performance, spring-return rotary actuator designed for precise and reliable control of dampers in HVAC systems. Operating on a universal 24V AC/DC power supply, this actuator delivers 5 Newton-meters (Nm) of torque, making it a robust solution for a wide range of commercial and industrial applications.
Its key feature is the spring-return fail-safe mechanism, which guarantees that the damper returns to a predefined safe position (either open or closed) in the event of a power failure or emergency signal. This is critical for life safety systems, including fire and smoke damper control.
Key Features at a Glance:
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Spring-Return Fail-Safe:Â Automatically returns damper to a safe position upon power loss.
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5 Nm Torque:Â Sufficient power for operating medium-sized dampers.
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Universal 24V AC/DC Power:Â Simplifies installation and compatibility with various control systems.
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150-Second Run Time:Â Optimized speed for precise modulation and control.
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Integrated Manual Override:Â Allows for manual positioning and testing without power.
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Two- or Three-Point Control:Â Versatile for both floating and modulating control signals.
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LED Status Indication:Â Visual feedback for actuator position and power.
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Rugged Metal Housing:Â Designed for long-term reliability in demanding environments.
Detailed Technical Specifications
| Specification | Details |
|---|---|
| Model | LMU24-SR 5NM |
| Torque | 5 Newton-meters (Nm) |
| Power Supply | 24V AC/DC (±10%) |
| Run Time | 150 Seconds (for 90° travel) |
| Control Signal | 2-point (On/Off) or 3-point (Floating) |
| Spring-Return | Yes (Fail-Safe) |
| Manual Override | Yes, integrated lever |
| Adjustable Angle | 0° to 90° (adjustable end stops) |
| Ambient Temperature | -4°F to 140°F (-20°C to 60°C) |
| Enclosure Rating | IP54 (Dust and water splash protected) |
| Housing Material | Aluminum Die-Cast |
| Connection | Plug-in, 6-pin |
Primary Applications & Uses
The LMU24-SR is engineered for applications where safety and reliability are paramount. Its most common uses include:
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Fire Dampers & Smoke Dampers:Â Essential for smoke control systems (SMOK) and life safety to isolate fire zones.
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VAV Terminal Units:Â Controlling inlet guide vanes or ventilation dampers.
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Ventilation & Exhaust Systems:Â For air handling units (AHUs) and general ventilation control.
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Safety Shut-Off Dampers:Â In laboratories or industrial processes where rapid isolation is required.
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Energy Management Systems:Â For zoning and pressure control in modern, high-efficiency buildings.
