Johnson Controls M9124-HGC-2 Actuator

The Johnson Controls M9124-HGC-2 Actuator is a high-torque, non-spring return motor designed for precise positioning of dampers and valves in large-scale HVAC systems. Delivering a robust 210 lb-in torque, this direct-coupled actuator eliminates the need for complex linkages, simplifying installation on round shafts up to 3/4 inch or square shafts up to 5/8 inch. This unit is the designated DM24-210-A cross-reference replacement, ensuring a seamless fit for legacy systems. It operates on a versatile 24V AC/DC power supply and supports multiple control signals, including 0-10VDC and 4-20mA proportional control via an integrated 500-ohm resistor. For custom sequencing, the adjustable start and span feature allows technicians to fine-tune the motor's response to specific controller outputs. With a travel time of 115 to 175 seconds and two SPDT auxiliary switches for end-stop signaling, the M9124-HGC-2 provides the reliable modulating damper control required for modern building automation.

Key Benefits

• High Performance: Delivers 210 lb-in of torque to handle large dampers and valves without stall issues.
• Precision Control: Features adjustable zero and span for custom signal mapping in complex sequences.
• Standard Compatibility: Universal 24V proportional actuator design works with most standard BAS and DDC systems.
• Easy Installation: Direct-mount design with screw terminals and manual gear release for rapid commissioning.
• Integrated Feedback: Two internal auxiliary switches provide confirmed position reporting to the controller.

Common Questions

How do I calibrate the start and span on the M9124-HGC-2?
Calibration is handled through internal jumpers and potentiometers. You can set the starting point (zero) between 0 to 6 VDC and the operating range (span) between 2 to 10 VDC to match your specific controller requirements.

Can these actuators be used in tandem for higher torque?
Yes, you can stack two M9124-HGC-2 units in a master/subordinate configuration to deliver a total of 420 lb-in of torque on a single damper shaft.

Is this a direct replacement for the DM24-210-A?
Yes, this model is the official replacement for the discontinued DM24-210-A, featuring identical mounting characteristics and performance specs.

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.