Johnson Controls M9208-BGC-3 Actuator

The Johnson Controls M9208-BGC-3 is a heavy-duty spring return direct coupled actuator engineered for precise on/off control in commercial HVAC systems. Delivering a robust 70 lb-in torque, this 24Vac/Vdc damper actuator is designed to operate reliably under demanding conditions, featuring a brushless DC motor that ensures a constant 55-71 second power-on run time regardless of the load. This model is equipped with an integral 48" appliance cable and a 3/8" FMC connector, simplifying field installation while maintaining a NEMA 2 enclosure rating. The inclusion of two SPDT auxiliary switches provides essential position feedback and interlocking capabilities for peripheral equipment. Its electronic stall detection eliminates the need for end-stops, protecting the gear train from over-torque damage. Whether you are performing a damper actuator replacement or a new building automation system integration, the M9208-BGC-3 offers the fail-safe operation and reversible mounting flexibility required by veteran mechanical contractors.

• Fail-Safe reliability: Mechanical spring return ensures the damper moves to a safe position during power loss, providing critical protection for the air handling system.
• Two-Position versatility: Optimized for on-off control, making it a drop-in solution for most standard HVAC damper and valve applications.
• Internal Feedback: Dual SPDT auxiliary switches are factory-set to provide accurate end-stop confirmation without requiring additional external sensors.
• Simplified Wiring: The integral 3/8" FMC connector and color-coded 18 AWG cable leads streamline actuator wiring in tight mechanical spaces.
• Universal Compatibility: Fits round shafts up to 5/8" and square shafts up to 1/2" as standard, reducing the need for specialized couplers.

Can the auxiliary switches be adjusted in the field?
Yes, while Switch S1 is fixed at 11°, Switch S2 is continuously adjustable from 25° to 90°, allowing you to customize the trip point for specific sequence-of-operation tasks.

Does this actuator require a specific orientation for mounting?
The unit supports reversible mounting, giving you the flexibility to choose clockwise or counterclockwise spring return based on the damper fail position requirements.

What happens if the damper jams during operation?
The integrated microprocessor-controlled electronic stall detection monitors the motor’s rotation and cuts power if a blockage is detected, preventing burnout and extending the service life of the hardware.

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.