M9208-BDC-3 Johnson Controls Actuator

Overview

The Johnson Controls M9208-BDC-3 is an M9208-Bxx-3 Series On/Off Electric Spring Return Actuator designed to provide control of dampers in Heating, Ventilating, and Air Conditioning (HVAC) systems. This direct-mount, bidirectional actuator features a mechanical spring-return system that ensures rated torque with or without power applied, and it operates without needing a damper linkage. The M9208-BDC-3 model includes two integrated line-voltage auxiliary switches to indicate end-stop positions or perform switching functions.

Features

• Direct-coupled design requires no crankarm or linkage
• Reversible mounting allows for either clockwise or counterclockwise operation
• Electronic stall detection protects the actuator from overload across all angles of rotation
• Double-insulated construction eliminates the need for an electrical ground connection
• Integral cables with colored and numbered conductors simplify installation and field wiring
• Two integrated line-voltage auxiliary switches (SPDT) for position indication
• Locking manual override with automatic release when power and control signals are restored

Specifications

• Torque: 70 lb·in (8 N·m) running and spring return
• Supply Voltage: AC 230 V (±10%) at 50/60 Hz
• Control Signal: Two-position (On/Off)
• Rotation Range: 95° with visual position indicator
• Auxiliary Switches: 2 Single-Pole, Double-Throw (SPDT), rated at 5.0 A (2.9 A inductive) at 240 V
• Standard Coupler Capacity: Fits round shafts from 5/16 to 5/8 in. (8 to 16 mm) or square shafts from 1/4 to 1/2 in. (6 to 12 mm)
• Enclosure Rating: NEMA 2 (IP54)
• Wiring: 18 AWG appliance cable

Applications

• Designed specifically to position return air, exhaust air, or outside air dampers in HVAC systems
• Ideal for control applications requiring reliable mechanical spring-return close-off during a loss of power
• Used in building automation and temperature control environments requiring 230 V line-voltage actuator solutions