Johnson Controls M9108-AGC-2 Actuator

The Johnson Controls M9108-AGC-2 Actuator is a professional-grade, non-spring return direct coupled actuator engineered for precise control of HVAC dampers and valves. Operating on 24Vac or 24Vdc power, this unit provides a robust 70 lb-in torque (8 Nm), making it an ideal choice for both small and medium-sized air handling systems. It supports floating control or two-position signal inputs, ensuring versatility across various building automation architectures. Designed with a high-efficiency DC motor and integrated electronic stall detection, the motor deactivates automatically if an obstruction is encountered, protecting the internal gear train without the need for mechanical end switches.

This model features two SPDT auxiliary switches factory-set to indicate position or perform switching functions at any point throughout the 93° rotation range. Installation is streamlined via screw terminals and a self-centering shaft coupler that accommodates round shafts up to 3/4-inch or square shafts up to 5/8-inch. With a fast 25-50 second travel time and an anti-rotation bracket included, the M9108-AGC-2 delivers reliable incremental control for critical air pressure and flow management applications. The 1/2-inch NPT threaded housing further simplifies conduit connections for field wiring by mechanical contractors.

• Dual Auxiliary Switches: Integrated SPDT switches provide easy end-stop verification or peripheral equipment interlocking.
• Direct Coupling: The universal mounting design eliminates the need for complex damper linkages, reducing maintenance and installation time.
• Stall Protection: Advanced electronic detection prevents motor burnout during high-torque events or physical blockages.
• Flexible Input: Compatible with both AC and DC 24V circuits for broad HVAC damper control system integration.
• Manual Override: A manual gear release button allows for quick physical positioning of the damper during commissioning.

What is the maximum shaft size for the M9108-AGC-2?
The standard self-centering coupler fits round shafts from 3/8" to 3/4" (10-20mm) and square shafts from 3/8" to 5/8" (10-16mm).

Can this actuator be used in tandem?
No, the M9108 series is not designed for tandem operation on a single shaft; for higher torque requirements, consider the M9116 or M9124 series.

How do I wire this for floating vs. on/off control?
For floating control, use three wires connected to the designated terminals to drive the actuator clockwise or counter-clockwise; for two-position control, a common and hot-switched leg are used according to the technical wiring diagram.

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.