Belimo LF24-MFT Actuator

The Belimo LF24-MFT is a high-performance spring return actuator designed for reliable control of dampers and valves in commercial HVAC systems. Providing 35 in-lb of torque, this 24VAC/DC motor utilizing Multi-Function Technology (MFT) allows for field-adjustable parameters including input signals and feedback. It supports 4-20mA control with a 500 Ohm resistor, PWM control via 1500 Ohm impedance, and floating point or On/Off signals. Engineered for failed-safe operation, the mechanical spring ensures a positive return to the original position during power loss. Its rugged construction and NEMA 2 (IP54) rating make it an industry standard for proportional control actuators in air handling units and terminal equipment. Technicians prefer the LF series for its simplified installation, 95-degree rotation stroke, and dependable brushless DC motor technology that prevents burnout under stalled conditions.

• MFT Versatility: Field-programmable for various control signals (0-10 VDC, PWM, floating point) to match specific HVAC automation requirements.
• Fail-Safe Security: Mechanical spring return ensures dampers reach a known safety position during power interruptions.
• Direct Mount Installation: Features a universal clamp for fast attachment to 1/2" to 3/4" shafts, reducing labor hours on the job site.
• Overload Protection: Digital circuits automatically sense end-stops, eliminating the need for limit switches and protecting the gear train.

How do I wire the Belimo LF24-MFT for 4-20mA control?
To utilize a 4-20mA signal, you must incorporate a 500 Ohm resistor in parallel with the control input. Ensure the MFT configuration is set to the corresponding voltage range (typically 2-10 VDC) to ensure linear movement.

Can this actuator be used in smoke and fire applications?
No, the LF24-MFT is designated for general damper automation and control applications. Life safety systems require UL555S rated actuators specifically designed for high-temperature cycles.

Is the direction of rotation reversible?
Yes, the direction of the spring return is determined by the mounting orientation (Clockwise or Counter-Clockwise). The control signal response can also be inverted via the programming software or internal dip switches depending on the specific model revision.

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.