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Siemens Building Technology GRD126.1U 2-Position SR Damper Actuator SW/FS 30 lb-in 24V

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Special Price $201.40 Regular Price $223.56
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GRD126.1U
Siemens GRD126.1U Spring Return Damper Actuator is a heavy duty device for critical safety and control in HVAC systems. The spring return mechanism and two position actuation of this actuator provide dependable and fail safe damper control in fire and smoke containment systems. This runs on 24 volt AC/DC power source and is capable of torque.The is fire and smoke loped for crucial safety and control in HVAC systems. This actuator offers dependable and fail-safe damper control in fire and smoke containment systems to its spring return mechanism and two-position operation. It runs on a 24 volt AC/DC power source and has a torque output.
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Specifications

  • Type: Spring Return Damper Actuator
  • Operation: 2-Position
  • Voltage: 24V AC/DC
  • Weight: 3.5lbs
  • Torque: 30lb-in
  • Frequency: 50/60 Hz

Product Overview:
Controls the operation of fire and smoke dampers in HVAC systems through an electrically powered rotary actuator mechanism. The Siemens Building Technology GRD126.1U Damper Actuator is an OEM OpenAir control component designed for two-position damper operation with spring-return functionality. It operates on 24V AC/DC power and provides 30 lb-in of torque to drive the connected damper assembly.

Two-Position Damper Operation:
Uses an on/off control signal to move the connected damper between its designated operating positions. The actuator provides a nominal 30-second operating time for 90° rotation, supporting controlled damper movement in approved fire and smoke control applications.

Spring-Return Fail-Safe Operation:
The spring-return mechanism moves the damper toward its designated fail-safe position when electrical power is removed. This feature supports safety-related damper operation during power interruptions and emergency conditions.

Replacement Guidelines:
Replace the Siemens Building Technology GRD126.1U Damper Actuator if the connected damper fails to open or close, the actuator does not respond to control signals, or the spring-return mechanism fails to move the damper to its designated safety position. Inspect the actuator mounting, electrical connections, damper shaft, and auxiliary switch operation for damage or wear. A qualified HVAC or fire and smoke control technician should test the 24V power supply, verify the two-position control signal, check the spring-return operation, and confirm the torque and mounting requirements against the original equipment specifications before installation.

Common Failure Symptoms:

  • Fire or smoke damper fails to reach the commanded position.
  • Actuator does not respond to on/off control signals.
  • Spring-return mechanism fails to operate during power interruption.
  • Damper movement becomes slow or inconsistent.
  • Auxiliary switches fail to provide position-related signals.
  • Actuator produces unusual operating noise.
  • Electrical connections become damaged or intermittent.

Equipment Compatibility:
The Siemens Building Technology GRD126.1U is an OEM OpenAir actuator designed for approved UL-listed fire and smoke control dampers and combination fire/smoke dampers. It operates with 24V AC/DC power and features two-position control, spring-return functionality, and two built-in auxiliary switches. Verify the damper assembly approval, shaft dimensions, mounting arrangement, electrical requirements, and original actuator reference against the equipment manufacturer's documentation before ordering.

Technical Specifications:
Brand: Siemens Building Technology
Part Number: GRD126.1U
Product Type: Damper Actuator
Series: OpenAir GRD
Component Type: Rotary Electronic Damper Actuator
Control Signal: 2-Position (On/Off)
Operating Voltage: 24V AC/DC

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Product Questions (7)
Customer Questions
What maintenance is required for the Siemens Building Technology GRD126.1U Damper Actuator?

Inspect the actuator regularly for loose wiring, dust buildup, and proper damper movement. Verify that the mounting hardware remains secure and that the actuator responds correctly to control signals. Disconnect power before servicing or testing electrical connections. Periodic operational checks help identify binding or positioning problems early.

What are common issues with the Siemens Building Technology GRD126.1U Damper Actuator?

  • Actuator fails to respond to control signals
  • Damper not opening or closing completely
  • Irregular or delayed actuator movement
  • Motor overheating during operation
  • Wiring connection faults causing intermittent performance
  • Excessive noise or vibration while cycling

What is the function of the Siemens GRD126.1U Damper Actuator?

It operates fire and smoke dampers through two-position electrical control and provides spring-return functionality for fail-safe damper positioning.

Is the Siemens Building Technology GRD126.1U a genuine OEM actuator?

Yes. It is an OEM Siemens OpenAir GRD Series actuator designed for specified fire and smoke damper applications. Verify the original actuator reference before ordering.

What voltage and torque rating does the GRD126.1U support?

It operates on 24V AC/DC power and provides a rated torque of 30 lb-in (3.4 Nm).

Which dampers are suitable for this actuator?

It is designed for compatible UL-listed fire, smoke, and smoke-control damper assemblies

What should a technician check before replacing this damper actuator?

A qualified HVAC or fire safety technician should verify the supply voltage, control signal, torque requirement, damper shaft dimensions, mounting arrangement, auxiliary switch operation, and spring-return function before installation.

Installation Steps

Step 1: Disconnect power to the HVAC system before beginning installation.

Step 2: Remove the old actuator and verify the damper shaft rotates freely.

Step 3: Mount the new actuator onto the damper shaft and tighten the retaining hardware securely.

Step 4: Wire the connections according to the equipment wiring diagram.

Step 5: Set the actuator position and test damper operation by restoring power and cycling the HVAC system.