Siemens Building Technology GMA221.1U Actuator
The Siemens GMA221.1U is a high-performance OpenAir damper actuator engineered for reliable 2-position (on/off) control in critical HVAC environments. Operating on a 120 VAC power supply, this direct-coupled unit delivers a robust 62 lb-in torque (7 Nm), making it the primary choice for managing return air, mixed air, and exhaust dampers in both constant and variable air volume (VAV) systems. The integrated spring return fail-safe mechanism ensures the damper transitions to its safety position immediately upon power loss, reaching full closure in just 15 seconds.
Built with veteran contractors in mind, the GMA221.1U actuator features a die-cast aluminum housing with a NEMA 1 (IP54) rating, providing durability for mechanical room installations. Its brushless DC motor technology prevents stall conditions without the need for limit switches, while the self-centering shaft coupling accommodates diameters from 3/8-inch to 3/4-inch. With a standard 90-second runtime and a 3-foot appliance cable, this Siemens damper motor simplifies retrofits and new installs by maintaining precise 90-degree angular rotation for face and bypass damper applications.
Key Benefits- Fail-Safe Reliability: Mechanical spring return actuator functionality guarantees immediate fail-safe positioning during power interruptions.
- Contractor-Grade Durability: Rugged aluminum alloy enclosure designed to withstand demanding commercial HVACR environments.
- Simplified Installation: Features a unique self-centering shaft adapter and manual override for faster commissioning.
- Universal Compatibility: Ideal for 2-position control of dampers requiring up to 62 lb-in of torque.
Is the GMA221.1U compatible with 24V control systems?
No, this specific model is a dedicated 120V damper actuator. For 24V applications, you should look at the GMA121.1U series.
What is the fail-safe response time?
The unit features a high-speed spring return that closes in approximately 15 seconds, significantly faster than the 90-second powered drive time.
Can this be mounted on a 1-inch shaft?
The standard self-centering adapter supports shafts up to 3/4-inch diameter. For larger shafts, specific mounting accessories may be required.
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.
Original: $228.87
-65%$228.87
$80.10Product Information
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Description
The Siemens GMA221.1U is a high-performance OpenAir damper actuator engineered for reliable 2-position (on/off) control in critical HVAC environments. Operating on a 120 VAC power supply, this direct-coupled unit delivers a robust 62 lb-in torque (7 Nm), making it the primary choice for managing return air, mixed air, and exhaust dampers in both constant and variable air volume (VAV) systems. The integrated spring return fail-safe mechanism ensures the damper transitions to its safety position immediately upon power loss, reaching full closure in just 15 seconds.
Built with veteran contractors in mind, the GMA221.1U actuator features a die-cast aluminum housing with a NEMA 1 (IP54) rating, providing durability for mechanical room installations. Its brushless DC motor technology prevents stall conditions without the need for limit switches, while the self-centering shaft coupling accommodates diameters from 3/8-inch to 3/4-inch. With a standard 90-second runtime and a 3-foot appliance cable, this Siemens damper motor simplifies retrofits and new installs by maintaining precise 90-degree angular rotation for face and bypass damper applications.
Key Benefits- Fail-Safe Reliability: Mechanical spring return actuator functionality guarantees immediate fail-safe positioning during power interruptions.
- Contractor-Grade Durability: Rugged aluminum alloy enclosure designed to withstand demanding commercial HVACR environments.
- Simplified Installation: Features a unique self-centering shaft adapter and manual override for faster commissioning.
- Universal Compatibility: Ideal for 2-position control of dampers requiring up to 62 lb-in of torque.
Is the GMA221.1U compatible with 24V control systems?
No, this specific model is a dedicated 120V damper actuator. For 24V applications, you should look at the GMA121.1U series.
What is the fail-safe response time?
The unit features a high-speed spring return that closes in approximately 15 seconds, significantly faster than the 90-second powered drive time.
Can this be mounted on a 1-inch shaft?
The standard self-centering adapter supports shafts up to 3/4-inch diameter. For larger shafts, specific mounting accessories may be required.
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.
