Belimo SY4-24MFT Actuator

The Belimo SY4-24MFT is a high-torque, non-spring return industrial actuator designed for precise control of ball and butterfly valves in demanding HVACR applications. Operating on 24VAC/DC, this unit delivers 800 in-lb torque, making it suitable for high-static pressure systems. Its Multi-Function Technology (MFT) allows for versatile signal inputs, including 4-20mA control (500 Ohm), PWM (1500 Ohm), floating point, and On/Off configurations. The NEMA 4X rated enclosure provides superior protection against corrosion and moisture ingress, ensuring electronics remain stable in harsh mechanical rooms. The internal heater prevents condensation, while the manual override facilitates easy diagnostic testing and commissioning. For technicians integrating into a Building Automation System (BAS), the Belimo SY4 series provides reliable feedback and high-resolution positioning. This technical-grade electronic valve actuator is built for heavy-duty cycling and long-term performance in commercial hydronic and air handling systems.

• Multi-Function Technology (MFT): Field-adjustable parameters for various control signals including proportional, floating point, and on/off.
• NEMA 4X Enclosure: Robust protection against hose-down, dust, and corrosive environments, ideal for industrial cooling plants.
• 800 in-lb Output: High torque capacity ensures reliable operation of larger diameter valves under significant pressure drops.
• Integrated Heater: Prevents internal moisture buildup, protecting the motor and control board in fluctuating temperatures.
• Manual Override: Handwheel allows for manual positioning during power outages or initial installation.

Common Questions

How do I configure the Belimo SY4-24MFT for 4-20mA input?
The actuator utilizes a 500 Ohm resistor to convert the 4-20mA signal to a 2-10VDC internal signal. Configuration can be adjusted using the Belimo PC Tool or ZTH US hand-held tool for precise calibration.

Is the Belimo SY4-24MFT suitable for outdoor installation?
Yes, the NEMA 4X / IP67 rating makes it suitable for outdoor environments, provided appropriate conduit fittings are used to maintain the seal integrity.

Does this actuator offer a failsafe position?
No, the SY4-24MFT is a non-spring return actuator. It will maintain its last position upon loss of power unless a backup power system is integrated into the control circuit.

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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.