Siemens Building Technology GCA151.1P Actuator

Upgrade your air handling systems with the Siemens OpenAir GCA151.1P, a heavy-duty spring return damper actuator engineered for precise 160 lb-in torque modulation. This 24V HVAC actuator supports a 4-20mA control signal as well as 0-10V or 2-10V inputs, providing versatile integration for constant (CAV) and variable air volume (VAV) installations. Built with brushless DC motor technology and integrated stall protection, this unit eliminates the need for limit switches while ensuring reliable movement under load. The fail-safe spring return offers bi-directional field-selection to secure dampers in a designated safe position during power loss. Featuring a patented self-centering shaft coupling and an all-metal housing, the Siemens GCA151.1P facilitates rapid direct-mount installation and withstands demanding commercial environments. Its plenum-rated 3-foot cable and 90-second run time make it a standard choice for mixed air, exhaust, and face-and-bypass damper control.

• Fail-Safe Reliability: High-performance mechanical spring return ensures positive closure or opening in less than 20 seconds upon power failure.
• Universal Compatibility: Seamlessly handles modulating control signals including 4-20mA and DC voltage, making it a drop-in replacement for many legacy systems.
• Durable Construction: Rugged die-cast metal housing protects internal components and maintains NEMA 2 protection in harsh mechanical rooms.
• Simplified Installation: The self-centering shaft adapter accommodates round shafts up to 1" or square shafts up to 3/4", reducing setup time for field technicians.
• Precise Feedback: Built-in position feedback allows for remote monitoring and real-time adjustment through the building automation system (BAS).

What is the difference between the GCA151.1P and the GCA151.1U models?
The "P" designation indicates a plenum-rated cable for use in air handling spaces without conduit, whereas the "U" model typically features an appliance-rated cable or standard wiring. Verify local building codes to ensure the correct jacket type for your installation.

Can this actuator be used with a 4-20mA signal without additional resistors?
Yes, the Siemens GCA151.1P is specifically designed to accept a 4-20mA input, though precise wiring depends on whether you are using a 500-ohm external resistor or the internal electronics. Consult the technical data sheet to confirm the input impedance settings.

How do I change the spring return direction (CW vs CCW)?
Direction is determined by the mounting orientation on the damper shaft. The actuator is bi-directional; flipping the unit over changes the fail-safe rotation from clockwise to counter-clockwise.

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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.