Johnson Controls M9108-HGC-2 Actuator

The Johnson Controls M9108-HGC-2 is a high-performance non-spring return direct coupled actuator engineered for precise control of dampers and valves in commercial HVAC systems. Delivering 70 lb-in torque, this proportional actuator supports a wide range of input signals, including 0-10 VDC, 0-20 mA with the included 500-ohm resistor, and 24 VAC/VDC power requirements. Designed for maximum field flexibility, it features an adjustable start and span, allowing technicians to calibrate the 25 to 50-second travel time to specific application requirements. The M9108-HGC-2 is equipped with two SPDT auxiliary switches for position feedback and accessory control, while the screw terminal connections ensure a secure, simplified installation. With its rugged construction and NEMA 2 rating, this actuator is a reliable solution for modulating control in air handling units and terminal units requiring dependable, high-resolution positioning without a fail-safe return requirement.

Key Benefits for Contractors

• Universal Input Compatibility: Operates on 24V AC/DC and accepts 0-10VDC or 4-20mA signals for seamless integration with BAS and DDC controllers.
• Field-Adjustable Performance: Technical flexibility via adjustable start and span settings enables custom stroke sequencing and precise damper control.
• Integrated Feedback: Two built-in SPDT auxiliary switches provide reliable end-stop verification and status monitoring without needing additional external components.
• Direct Coupled Installation: The non-spring return design mounts directly to shafts, reducing mechanical linkage failures and streamlining the HVAC actuator replacement process.

Common Installation Questions

How do I wire the M9108-HGC-2 for a 4-20mA signal?
To utilize a 4-20mA input, you must install the provided 500-ohm resistor across the input terminals to convert the current signal to a 2-10VDC signal for the actuator logic.

Can the rotation direction be reversed on this model?
Yes, the direction of rotation is selectable via a jumper or switch on the circuit board, allowing for clockwise or counter-clockwise operation depending on the damper configuration.

What size damper can the 70 lb-in M9108-HGC-2 handle?
Typically, this actuator is rated for dampers up to 17.5 square feet, assuming a standard torque requirement of 4 lb-in per square foot for low-leakage dampers.

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.