Johnson Controls M9208-AGC-3 Actuator

The Johnson Controls M9208-AGC-3 is a heavy-duty spring return direct coupled actuator designed to provide reliable positioning of dampers in critical HVACR systems. Delivering 70 lb-in torque, this unit is built with a microprocessor-controlled brushless DC motor that ensures a constant 150-second power on run time regardless of the load. This model is engineered for versatile field integration, supporting both 24VAC/VDC floating control and two-position control logic. The internal mechanical spring return system provides essential fail-safe operation, returning the damper to its original position during power loss for enhanced system safety.

Installation efficiency is optimized via the 48-inch appliance cable with integral 3/8" FMC connector, allowing for direct wiring without additional conduit fittings. The M9208-AGC-3 also features two integrated SPDT auxiliary switches; one is fixed at 11 degrees for proving closed, while the other is fully adjustable from 25 to 90 degrees for precise signaling. With electronic stall detection and reversible mounting capabilities, this damper actuator is a robust choice for contractors managing air-handling units and exhaust systems.

Key Benefits

• Dual Auxiliary Signaling: Features two SPDT auxiliary switches for end-stop positioning and system feedback without extra hardware.
• Fail-Safe Performance: Reliable spring return torque ensures dampers close or open fully during a power failure.
• Brushless DC Technology: A microprocessor-driven motor provides electronic stall detection, protecting the gears and increasing long-term reliability.
• Direct-Coupled Versatility: Fits round shafts from 5/16" to 5/8" and square shafts from 1/4" to 1/2", eliminating the need for complex linkages.
• Integrated Conduit Connector: The 3/8" FMC connector simplifies the electrical interface and reduces installation time on the job site.

Common Questions

Can the M9208-AGC-3 be used for proportional 0-10V control?
No, this specific model is designed for floating control or two-position (on/off) applications. If you require proportional control, a 0-10V or 4-20mA model from the M9208-GGx series would be necessary.

How do I adjust the auxiliary switch settings?
The S1 switch is fixed at 11 degrees for end-stop verification. You can manually adjust the S2 switch to any point between 25 and 90 degrees to trigger external equipment such as fans or indicators at a specific rotation point.

Is an electrical ground required for the auxiliary switches?
The switches on the M9208-AGC-3 are double-insulated, meaning an electrical ground is typically not required for these specific signaling components, which simplifies wiring in retrofit applications.

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.