Description
The Siemens GRD221.1U is a 120V, 2-position spring-return actuator engineered specifically for fire and smoke damper applications. Designed to meet the demanding requirements of life-safety HVAC systems, this actuator delivers reliable fail-safe performance — automatically returning to its de-energized position upon loss of power to help contain smoke and fire in commercial and institutional buildings.
Key Features
- 120V AC supply voltage for compatibility with standard commercial control circuits
- 2-position (open/closed) spring-return operation ensures fail-safe damper closure on power loss
- Designed for fire/smoke damper control in life-safety HVAC applications
- Spring-return mechanism provides automatic, power-independent fail-safe positioning
- Robust Siemens Building Technology construction for long-term reliability
- Compact design suitable for a wide range of damper installations
Application
The GRD221.1U is ideal for use in commercial, institutional, and industrial HVAC systems where fire and smoke control is critical. It is commonly installed on fire/smoke combination dampers in air handling units, ductwork, and building compartmentalization systems. The spring-return design ensures that dampers automatically close in the event of a power failure, supporting compliance with fire and life-safety codes.
Why Choose Siemens Building Technology
Siemens Building Technology is a globally recognized leader in HVAC controls, building automation, and life-safety systems. The GRD221.1U reflects Siemens’ commitment to precision engineering, code-compliant design, and dependable performance in critical applications. Contractors and facility managers trust Siemens actuators for their ease of installation, long service life, and consistent operation.
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