Siemens Building Technology GCA221.1U Actuator

The Siemens GCA221.1U is a high-torque spring return rotary actuator engineered for reliable control of building automation dampers and valves. Operating on 120 VAC, this Open/Closed (on/off) actuator delivers 142 lb-in (16 Nm) of torque, making it a standard choice for large air handlers and systems requiring fail-safe positioning. Designed for mechanical spring return during power loss, it ensures the controlled component returns to its safety position. This OpenAir actuator features a rugged metal housing and a self-centering shaft adapter, reducing installation time and ensuring long-term alignment stability in demanding HVACR environments. Its brushless motor technology provides precise positioning and low power consumption during holding. For contractors, the GCA221.1U offers a robust solution for smoke control dampers or general ventilation where high-torque performance is non-negotiable and 120V power is readily available at the terminal box.

• 142 lb-in Torque: Provides sufficient force for large-scale dampers and unit ventilators.
• Fail-Safe Operation: Mechanical spring return ensures immediate safety positioning during power interruptions.
• Simplified Installation: Features a self-centering shaft adapter for quick and secure mounting to various shaft sizes.
• 120 VAC Input: Standard voltage compatibility for light commercial and industrial retrofit projects.
• NEMA 2 Rating: Durable construction suitable for indoor environments and protected mechanical rooms.

Common Questions

What is the typical stroke time for the GCA221.1U?
This actuator typically features a 90-second motor run time for 90 degrees and a 15-second spring return time to ensure rapid closure upon power loss.

Can this actuator be used for modulating signals?
No, this specific model is designed for 2-position (on/off) control. For 0-10V or 4-20mA modulating applications, a different model in the OpenAir series must be selected.

What damper size is this actuator rated for?
While torque requirements vary by manufacturer, the 142 lb-in rating generally supports dampers up to 35 square feet, depending on seal friction and air velocity.

This item is not eligible for free shipping.

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.