Siemens Building Technology GMA131.1P Actuator

The Siemens OpenAir GMA131.1P is a heavy-duty 24V floating electronic damper actuator designed for high-precision HVAC control. Built with a rugged die-cast aluminum housing and 62 lb-in torque (7 Nm), this rotary actuator is ideal for managing return air, mixed air, and exhaust dampers in both constant and variable air volume systems. As a spring return damper actuator, it ensures a reliable fail-safe position during power loss, providing critical protection for terminal units and air handling equipment. The unit features brushless DC motor technology with stall protection to ensure longevity and consistent performance under high-static conditions.

Installation is streamlined via a self-centering shaft coupling that accommodates shaft diameters from 3/8-inch to 3/4-inch, reducing setup time for field technicians. This specific model includes a 3-foot plenum-rated cable for safe routing through air ceilings and environmental air spaces. With a 90-second runtime and a 15-second spring return closing time, the GMA131.1P provides the rapid response required for modern building automation sequences and 3-point floating control strategies.

Key Benefits

• Mechanical Fail-Safe: Reliable spring return ensures dampers close or open fully during power interruptions.
• Precision Control: Optimized for 3-point floating signals to maintain exact environmental setpoints.
• Direct-Coupled Integration: Features a self-centering shaft adapter for universal mounting without additional linkages.
• Durable Engineering: Utilizes brushless DC motor technology to prevent burnout and minimize maintenance cycles.
• Plenum Rated: Equipped with a factory-installed plenum cable for code-compliant installation in air handling spaces.

Common Questions

What is the torque rating for the GMA131.1P?
This actuator provides 62 lb-in (7 Nm) of running and spring return torque, suitable for dampers up to approximately 15 square feet.

Does this model support 3-point floating control?
Yes, the Siemens GMA131.1P is specifically designed for 24V floating control (three-position) applications.

Can I manually position the damper during commissioning?
Yes, the unit includes a manual override crank, allowing contractors to position the damper before power is applied to the system.

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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.