M9208-BAC-3 Johnson Controls Actuator

Overview

The Johnson Controls M9208-BAC-3 is a heavy-duty, spring-return direct-coupled electric actuator designed to provide reliable two-position (on/off) control for dampers in commercial HVAC systems. Operating on 120 VAC power, it delivers a rated torque of 70 lb-in (8 N-m) to ensure positive damper actuation. In the event of a power loss, an integrated mechanical spring-return system automatically drives the actuator back to its fail-safe position, making it ideal for ventilation control, smoke management, and energy management applications.

Features

• Direct-coupled design enables easy installation directly onto damper shafts without requiring a linkage.
• Integrated spring-return fail-safe mechanism ensures the damper returns to a safe position during power interruptions.
• Equipped with two built-in SPDT auxiliary switches providing end-of-travel feedback signals for system integration.
• Electronic stall detection provides continuous protection against overload across all angles of rotation without needing mechanical end switches.
• Double-insulated construction eliminates the requirement for an electrical ground connection.
• Reversible mounting design allows for simple adjustment to achieve either clockwise or counterclockwise powered operation.

Specifications

• Model: M9208-BAC-3
• Supply Voltage: 120 VAC, 50/60 Hz
• Control Signal: Two-Position (On/Off)
• Output Torque: 70 lb-in (8 N-m)
• Run Time (Power On): 55 to 71 seconds
• Fail-Safe Operation: Mechanical Spring Return
• Enclosure Rating: NEMA 2 (IP54)
• Auxiliary Switches: 2 x SPDT (Single-Pole, Double-Throw)
• Electrical Connection: 48-inch (1.2m) appliance cable with an integral 3/8-inch Flexible Metal Conduit (FMC) connector
• Rotation Range: 95 degrees with a graduated visual scale indicator

Applications

• Control of return air, exhaust air, and outside air dampers in commercial HVAC systems.
• Automation of air handling units (AHUs) and ventilation systems.
• Position indication and control for smoke and fire dampers.
• Integration into building automation systems (BAS) and energy management setups.
• Multi-zone two-position air control applications.