M9203-BUB-2 Johnson Controls Actuator

Overview

The Johnson Controls M9203-BUB-2 is a robust, direct-mount electric spring-return actuator designed to provide reliable on/off control for dampers in Heating, Ventilating, and Air Conditioning (HVAC) systems. It features a mechanical fail-safe spring-return system that delivers rated torque with or without power applied, ensuring dampers return to a safe position during power interruptions.

Features

• Direct-coupled design enables easy installation directly onto damper shafts without requiring a complex linkage.
• Reversible mounting allows the actuator to provide either clockwise or counterclockwise fail-safe operation.
• Electronic stall detection provides overload protection throughout the entire rotation range.
• Reduced power consumption when operating in holding mode.
• Integrated Single-Pole, Double-Throw (SPDT) auxiliary switch for end-stop position signaling or interlocking functions.
• Double-insulated construction eliminates the need for an electrical ground connection.

Specifications

• Supply Voltage: 85 to 264 VAC at 50/60 Hz (universal line voltage input).
• Output Torque: 27 lb-in (3 N·m) running and spring returning.
• Rotation Range: Maximum full stroke of 95°, adjustable from 35° to 95° using an optional stop kit.
• Power-On Run Time: Less than 75 seconds for 90° of travel.
• Spring Return Time: Less than 25 seconds at room temperature.
• Electrical Connection: 48-inch (1.2 m) 18 AWG appliance cable with integrated 1/2-inch (13 mm) threaded conduit connectors.
• Shaft Compatibility: Fits round shafts from 1/4 to 1/2 in. (6 to 12 mm) and square shafts from 1/4 to 5/16 in. (6 to 8 mm).
• Lifecycle Rating: 60,000 full stroke cycles at rated load.

Applications

The M9203-BUB-2 is utilized in commercial and light industrial HVAC building automation systems for precise control of air dampers. It is suitable for control applications requiring a dependable fail-safe configuration, such as outdoor air intakes, exhaust ventilation, and zone control dampers.