Johnson Controls M9108-HGA-2 Actuator

The Johnson Controls M9108-HGA-2 Actuator is a heavy-duty non-spring return direct coupled actuator designed for the precise positioning of dampers and valves in commercial HVAC systems. Operating on 24VAC or 24VDC power, this proportional actuator delivers a consistent 70 lb-in torque, making it a reliable choice for medium-sized air handlers and terminal units. It supports a 0-10 VDC or 0-20 mA control signal, with integrated adjustable start and span functionality to allow for customized field calibration. The M9108-HGA-2 features a rapid 25-50 second travel time for 90 degrees of rotation, ensuring responsive modulation. Its screw terminal electrical connections simplify field wiring, while the compact design allows for direct mounting onto damper shafts or valve linkages without complex mounting brackets. This Johnson Controls actuator is engineered for high-duty cycle applications where long-term positioning accuracy and electronic stall detection are critical for system efficiency.

• Field Adjustability: The adjustable start and span allows technicians to calibrate the proportional control signal to match specific system requirements.
• High Torque Density: Delivers 70 lb-in (8 Nm) of torque in a compact frame, ideal for tight mechanical spaces.
• Flexible Signal Input: Natively accepts 0 to 10 VDC or 0 to 20 mA (via the included 500-ohm resistor) for seamless integration with varied BAS controllers.
• Ease of Installation: Direct coupled mounting and screw terminals reduce labor time during retrofit or new construction phases.
• Brushless DC Motor: Ensures constant torque across the full range of motion while providing electronic stall protection to prevent motor burnout.

How do I change the rotation direction on the M9108-HGA-2?
Direction of rotation is easily reversed by flipping the signal polarity or adjusting the internal jumper settings located under the wiring cover, allowing for clockwise or counter-clockwise operation.

Can this actuator be used in failsafe applications?
No, the M9108-HGA-2 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.

What size damper shaft can this actuator accommodate?
This direct coupled actuator is designed to mount onto 3/8" to 3/4" (10 to 20 mm) round shafts or 3/8" to 5/8" (10 to 16 mm) square shafts using the standard universal clamp.

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.