Siemens Building Technology GJD221.1U Actuator

The Siemens GJD221.1U is a high-performance fire smoke damper actuator designed for critical life safety applications. Engineered for 120V systems, this OpenAir model delivers 20 lb-in torque to ensure reliable operation of UL-listed smoke control and combination fire/smoke dampers. As a veteran-grade spring return actuator, it features a 2-position (on/off) control signal with a rapid 30-second driving time and a 15-second fail-safe spring return. This ensures dampers reach their safety position quickly during a power loss or alarm state. The Electronic Fusible Link (EFL) capability allows for precise temperature-triggered closure at 165°F, 212°F, or 250°F, depending on the link installed. Built with a plenum-rated housing and 3-foot pre-cabled leads, the GJD221.1U simplifies field installation for contractors while meeting UL555S and AMCA 520 standards. Its robust construction eliminates the need for special cycling, making it a dependable choice for maintaining HVAC life safety integrity in commercial ductwork.

• Rapid Fail-Safe Response: Ensures 15-second closure upon power interruption, critical for smoke containment.
• Precision Thermal Monitoring: Designed for an Electronic Fusible Link (EFL) to trigger closure at specific temperature setpoints.
• NEMA 1 Plenum Rating: Features a durable plastic housing suitable for installation in environmental air spaces.
• High-Torque Performance: Provides 20 lb-in of driving torque, ideal for smaller to medium-sized fire and smoke dampers.
• Simplified Wiring: Pre-cabled with 3-foot leads to reduce labor time during fire damper actuator replacement.

Is the Siemens GJD221.1U compatible with other EFL temperature ratings?
Yes, this unit supports the Siemens ASK791 series Electronic Fusible Links, which are available in 165°F, 212°F, and 250°F options to meet various local fire codes.

Can I use this actuator to replace a 24V model?
No, this is a dedicated 120VAC actuator. Always verify your supply voltage and control signal requirements before installation to prevent equipment damage.

Does this model include auxiliary switches?
The GJD221.1U is the standard base model without auxiliary switches. For applications requiring position feedback to a fire alarm panel, the GJD226.1U variant should be used.

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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.