Belimo LRB24-MFT Actutator

The Belimo LRB24-MFT is a high-torque non-spring return actuator designed for precise control of pressure independent characterization valves and standard ball valves. Delivering 45 in-lb of torque, this Multi-Function Technology (MFT) actuator offers field-programmable flexibility for 4-20mA proportional control (using a 500 Ohm resistor), PWM control (1500 Ohm), floating point, or standard On/Off 24Vac/dc signals. As the direct replacement for LR24-MFT, it integrates seamlessly into existing building automation systems, providing a brushless DC motor for constant torque and quiet operation. Technicians rely on its adjustable running time and manual override button for efficient commissioning. The low power consumption during holding ensures energy efficiency in complex HVAC layouts. With a NEMA 2 / IP54 rating and a -22°F to 122°F operating range, this unit maintains reliable 0 to 95% stroke positioning in demanding commercial environments.

Key Technical Benefits

• MFT Programmability: Field-adjustable parameters allow for custom input signals, running times, and feedback settings.
• Direct Retrofit Compatibility: Serves as the engineered LRB24-MFT replacement for older LR24-MFT installations.
• Electronic Overload Protection: Eliminates the need for limit switches, preventing motor burnout and improving longevity.
• Manual Override: External push-button allows for gear train disengagement for manual valve positioning during setup.
• Constant Torque: Brushless motor technology provides consistent speed and 45 in-lb force regardless of load fluctuations.

Frequently Asked Questions

Does the LRB24-MFT require a specific mounting orientation?
The actuator can be mounted in any orientation, but for NEMA 2 protection, avoid mounting the unit upside down where moisture could collect in the cable gland.

What is the maximum run time for this actuator?
The default run time is 90 seconds, but through MFT programming, it can be adjusted between 40 and 150 seconds to match specific system requirements.

Can I use this for fail-safe applications?
No, this is a non-spring return actuator. For fail-safe requirements, you would need to specify a Belimo series with an internal capacitor or spring return mechanism.

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.