M9208-GGA-2 Johnson Controls Actuator

Overview

The Johnson Controls M9208-GGA-2 is a proportional electric spring-return direct-coupled actuator designed to control dampers in HVAC systems. Operating on 24 VAC/VDC power, it provides precise modulation for critical airflow control in commercial and institutional applications. It features a mechanical spring-return system that ensures automatic fail-safe repositioning during a power loss, as well as a microprocessor-controlled brushless DC motor with electronic stall detection. It comes equipped with a 120-inch plenum-rated cable and integral 3/8-inch flexible metal conduit connectors for simplified installation.

Features

• 70 lb-in (8 N-m) running and spring-return torque for dependable fail-safe positioning
• Direct-coupled design eliminates the need for complex damper linkages
• Microprocessor-controlled brushless DC motor ensures constant speed independent of torque
• Electronic stall detection monitors motor rotation to prevent damage without mechanical end switches
• Reversible mounting allows for easy adaptation to change the control direction
• Locking manual override with auto release and convenient crank storage
• Durable NEMA 2 (IP54) double-insulated construction

Specifications

• Supply Voltage: 24 VAC (nominal, 8 VA) or 24 VDC
• Torque: 70 lb-in (8 N-m)
• Control Signal: Proportional analog, 0 to 10 VDC or 2 to 10 VDC (supports 0 to 20 mA or 4 to 20 mA with an external 500-ohm resistor)
• Position Feedback: 0 to 10 VDC or 2 to 10 VDC signal
• Cycle Runtime: 150 seconds power-on; 17 to 25 seconds spring-return
• Rotation Range: 95°
• Enclosure Rating: NEMA 2 (IP54)
• Wiring: 18 AWG, 120-inch (3 m) plenum-rated cable with colored/numbered conductors
• Conduit Connection: Integral 3/8-inch (10 mm) Flexible Metal Conduit (FMC) connectors
• Operating Temperature: -40°F to 140°F (-40°C to 60°C)
• Operating Humidity: 0 to 95% RH, noncondensing

Applications

• Proportional modulation of dampers in commercial, institutional, and light industrial HVAC systems
• Failsafe automation for critical airflow and ventilation routing during power outages
• Installation in environmental air-handling spaces and ceilings outside of dedicated ducts, compliant with NFPA 70 plenum requirements
• Master-slave setups requiring precise coordinate control utilizing the integrated voltage feedback signal