Belimo TFRX24-MFT Actuator

The Belimo TFRX24-MFT is a versatile spring-return damper actuator designed for reliable fail-safe operation in HVAC systems. Delivering 22 in-lb of torque, this 24V actuator utilizes Multi-Function Technology (MFT) to provide wide-ranging control options, including 4-20mA proportional control (via 500 Ohm internal resistance), PWM signal integration (1500 Ohm), floating point, and standard on/off functionality. Engineered for small dampers, control valves, and air handlers, it ensures precise air volume control and automatic mechanical closure during power loss. The NEMA 2 (IP54) rated housing and brushless DC motor technology eliminate the common failures associated with traditional brushed motors, extending operational life in demanding commercial environments. By supporting 24VAC/DC input and offering a field-programmable control signal, the TFRX24-MFT simplifies truck stock requirements for contractors managing diverse site specifications.

Key Benefits for Technicians

• Multi-Function Technology (MFT): Allows for field adjustment of control signals and feedback, making it a universal replacement for various 22 in-lb applications.
• Fail-Safe Reliability: Mechanical spring return ensures the damper or valve moves to a safe position during emergency shutdowns or power interruptions.
• Efficient Power Consumption: The brushless DC motor draws minimal power while providing consistent torque and electronic stall protection.
• Compact Footprint: Designed for tight mechanical spaces, the TFRX series mounts easily on standard dampers or via specialized valve linkages.

Common Questions

How do I configure the TFRX24-MFT for a 4-20mA signal?
The unit features a dedicated input impedance of 500 Ohms for 4-20mA signals, allowing for seamless integration with most building automation systems without external resistors.

Can this actuator be used in outdoor applications?
The TFRX24-MFT carries a NEMA 2/IP54 rating, protecting it against falling dirt and light splashing water. For full weather exposure, a protective NEMA 4 enclosure is recommended.

What is the typical runtime for the spring return?
The motor provides a controlled drive time of 95 seconds for 95 degrees of rotation, while the mechanical spring fail-safe triggers in less than 25 seconds.

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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.