M9208-BGC-3 Johnson Controls Actuator

Overview

The Johnson Controls M9208-BGC-3 is a heavy-duty, spring-return direct-coupled electric actuator designed to provide reliable two-position (on/off) control for dampers in commercial and industrial HVAC systems. It features a mechanical spring-return system that ensures the damper automatically returns to a predetermined safe fail-safe position upon a loss of power, making it ideal for outdoor air, exhaust, and smoke control dampers. Operating on low voltage, this compact actuator mounts directly to damper shafts without the need for complex linkages and includes integrated auxiliary switches for position feedback.

Features

• Fail-Safe Spring Return: Automatically returns the damper to its default safety position during a power failure.
• Two-Position Control: Simple on/off operation ideal for straightforward open/close damper applications.
• Direct-Coupled Mounting: Mounts directly to shafts via a universal clamp, eliminating the need for damper linkage hardware and speeding up installation.
• Integrated Auxiliary Switches: Features two built-in SPDT auxiliary switches for end-of-travel position feedback, fan interlocking, or building automation system integration.
• Durable Construction: Equipped with a brushless DC motor, electronic stall detection, and a rugged NEMA 2 (IP54) enclosure.
• Convenient Wiring: Includes a 48-inch appliance cable with an integral 3/8-inch flexible metal conduit (FMC) connector for code-compliant installations.

Specifications

• Torque: 70 lb-in (8 N-m) rated torque.
• Supply Voltage: 24 VAC (19.2 to 28.8 VAC) at 50/60 Hz or 24 VDC (21.6 to 28.8 VDC).
• Power Consumption: 6.1 VA / 7 VA.
• Power-On Run Time: 55 to 71 seconds for smooth, controlled actuation.
• Rotation Angle: 95° maximum mechanical rotation.
• Auxiliary Switches: 2 x SPDT (Single-Pole, Double-Throw) switches.
• Enclosure Rating: NEMA 2 / IP54 gasket-sealed housing.
• Shafit Compatibility: Direct mounts to round shafts from 5/16 in. to 5/8 in. (8 to 16 mm) diameter; compatible with larger shafts up to 3/4 in. (19 mm) using an accessory kit.
• Operating Temperature: -40°F to 140°F (-40°C to 60°C).
• Operating Humidity: 0 to 95% RH, non-condensing.
• Certifications: CE compliant and UL listed.

Applications

• Commercial HVAC Systems: Regulating airflow and temperature within air handling units, zone dampers, and VAV systems.
• Fail-Safe Damper Control: Controlling outdoor air intakes, exhaust vents, and smoke dampers where return to a safe state is required during power interruptions.
• Building Automation Systems (BAS): Providing end-stop position indication and status control back to automated building management frameworks.