Johnson Controls M9124-JGA-2 Actuator

The Johnson Controls M9124-JGA-2 is a heavy-duty electric non-spring return actuator engineered for precise control of dampers and large valves in complex HVAC automation systems. Operating on a 24V AC/DC power supply, this model delivers a robust 210 lb-in torque, making it suitable for high-static pressure environments. It features a unique 100-10,000 ohm potentiometer feedback signal, allowing for accurate position monitoring via a building management system. Designed for versatility, the M9124-JGA-2 supports floating control and on/off control sequences. Field technicians value the manual override button and the adjustable rotation span, which allow for rapid calibration and commissioning on-site. The compact footprint and universal mounting design ensure that this JCI M9124 actuator integrates seamlessly into existing ductwork or manifold setups without requiring extensive modifications.

Key Benefits

• High Torque Delivery: Provides 210 lb-in of force to manage dampers up to 52 square feet without binding.
• Potentiometer Feedback: Includes a 100-10k ohm feedback circuit for exact position verification.
• Synchronous Motor: Ensures consistent timing and damper actuator travel speed regardless of load variations.
• Easy Installation: Features a round shaft coupling and a simple terminal block for 24V HVAC wiring.
• Maintenance-Free Operation: Brushless motor technology reduces mechanical wear and extends service life in commercial air handlers.

Common Questions

Can I use the M9124-JGA-2 for fail-safe applications?
No, this is a non-spring return actuator. It will maintain its last position upon loss of power rather than returning to a default open or closed state.

How do I calibrate the feedback signal?
The 100–10k ohm potentiometer feedback is proportional to the shaft position. Calibration is handled via the controller's input setup to map the resistance range to the physical stroke of the damper.

What is the maximum rotation for this unit?
The standard stroke is 90 degrees, but it can be field-adjusted using mechanical stops to match specific airflow requirements.

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.