Bray Commercial DM24-35 Actuator

The Bray DM24-35 is a high-performance non-spring return actuator engineered for precise control of damper applications and valve linkages in commercial HVAC systems. Operating on 24VAC/DC power, this unit accepts a 2-10VDC or 4-20mA modulating signal, providing versatile integration with various building automation systems. Delivering a minimum of 35 lb-in (4 Nm) torque, the DM24-35 ensures reliable positioning for small to medium-sized dampers. This model is a direct functional equivalent to the NR-2204-541, making it a reliable drop-in replacement for legacy Schneider Electric or Invensys hardware. Its compact design facilitates installation in tight mechanical spaces, while the brushless DC motor provides consistent timing and long-term positioning accuracy without the need for frequent recalibration. For technicians managing VAV box control or multi-zone air handling units, this actuator offers the feedback signal necessary for real-time monitoring of damper blade orientation.

• Universal Compatibility: Field-selectable 2-10VDC or 4-20mA input ensures seamless communication with standard BAS controllers.
• Interchangeable Design: Serves as a direct technical cross-reference for the NR-2204-541, reducing truck stock requirements.
• Synchronized Timing: Constant motor speed regardless of load ensures predictable damper modulation and system balancing.
• Manual Override: Integrated push-button allows for manual gear disengagement to simplify field commissioning and HVAC troubleshooting.
• Lower Power Consumption: Efficient 24V NSR actuator circuitry minimizes transformer loading in large-scale deployments.

Can the DM24-35 replace a spring-return actuator?
No, this is a non-spring return (NSR) model. It will maintain its last position upon loss of power rather than returning to a fail-safe position.

What is the maximum damper area this unit can drive?
Typically, this 35 lb-in actuator is rated for dampers up to approximately 8.75 square feet, depending on the seal type and aerodynamic load.

How do I calibrate the 4-20mA signal?
The actuator utilizes a 500-ohm resistor for current loop applications. Ensure the dip switches or wiring configurations follow the Bray technical schematics for proper signal conversion.

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.