Belimo LF24-MFT-S Actuator Motor

The Belimo LF24-MFT-S is a high-performance spring-return actuator designed for the fail-safe operation of dampers and valves in professional HVAC systems. Delivering 35 in-lb of torque, this unit provides reliable control for smaller air handlers and terminal units. Operating on a 24VAC/DC power supply, the Multi-Function Technology (MFT) allows for versatile signal input, including 4-20mA via a 500 Ohm resistor, PWM via 1500 Ohm, floating point, and On/Off control. This model features an integrated SPDT auxiliary switch for position signaling or interlocking equipment. Built with a rugged NEMA 2 housing, it ensures consistent performance in demanding environments. Field-adjustable parameters such as running time and control signal make this proportional control actuator a versatile solution for contractors managing precise airflow requirements. The mechanical spring return guarantees a defined safety position upon power loss, minimizing risk in critical sequences.

• Fail-Safe Reliability: Mechanical spring return ensures the damper returns to the start position during power cycles or outages.
• MFT Configuration: Provides the flexibility to adapt the control signal to match various building automation system requirements.
• Integrated Feedback: Built-in auxiliary switch eliminates the need for external mounting kits for status monitoring.
• Universal Compatibility: Standard 1/2-inch to 3/4-inch clamp fits most damper shafts, reducing the need for specialized hardware.
• Energy Efficiency: Low power consumption during holding cycles reduces the overall electrical load on the transformer.

How do I wire the LF24-MFT-S for a 4-20mA signal?
To utilize a 4-20mA control signal, a 500 Ohm resistor must be installed across the input leads to convert the current signal into a 2-10VDC voltage range compatible with the MFT logic.

Can the direction of the spring return be reversed?
Yes, the fail-safe direction is determined by the mounting orientation. Technicians can select clockwise or counter-clockwise return by flipping the actuator on the damper shaft.

Does this unit support manual override?
The LF series includes a manual crank that allows for manual positioning of the damper, which is locked in place until power is restored or the lock is manually released.

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.