Belimo SY4-120MFT Actuator

The Belimo SY4-120MFT is a high-torque, non-spring return industrial actuator designed for precise control of large butterfly and ball valves. Delivering 3560 in-lb of torque, this unit operates on 120VAC and utilizes Multi-Function Technology (MFT), allowing for field-adjustable input signals. Whether your site requires 4-20mA control (via 500 Ohm internal resistance), PWM control (via 1500 Ohm), floating point, or standard on/off actuation, the SY4-120MFT accommodates complex integration requirements. Built with a rugged NEMA 4X enclosure, it is purpose-built for harsh environments where moisture and corrosion resistance are mandatory. This actuator is often the professional choice for condenser water loops and industrial HVAC valve automation due to its reliable brushless DC motor technology and electronic overload protection, ensuring consistent valve position feedback and long-term diagnostic accuracy in the field.

• Universal Control Input: Features MFT circuitry for seamless adaptation to various BMS controllers and signal types.
• High Torque Performance: Robust 3560 in-lb output manages high-pressure valve bodies without stalling.
• Industrial Durability: The NEMA 4X (IP67) rating ensures the internal gears and electronics are protected against hose-down or outdoor exposure.
• Manual Override: Equipped with a handwheel for manual positioning during commissioning or power loss.
• Electronic Protection: Advanced sensing prevents motor burnout by detecting end-of-travel and obstructions automatically.

How do I configure the control signal on a Belimo SY4-120MFT?
The Multi-Function Technology allows the actuator to be programmed using the Belimo PC Tool or ZTH US handheld tool. You can adjust the input signal, running time, and feedback parameters to match specific sequence-of-operation requirements.

Is the Belimo SY series suitable for outdoor installation?
Yes, the NEMA 4X enclosure is designed to withstand salt spray, rain, and dust. However, ensure all conduit entries are properly sealed with liquid-tight fittings to maintain the IP-rating integrity.

Can this actuator be used in failsafe applications?
No, the SY4-120MFT is a non-spring return actuator. For applications requiring a safety return position upon loss of power, a spring-return model or an external uninterruptible power supply (UPS) must be utilized.

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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.