Johnson Controls M9310-HGA-2 Damper Actuator User Manual

1. Introduction and Overview

This manual provides essential information for the installation, operation, and maintenance of the Johnson Controls M9310-HGA-2 Damper Actuator. The M9300 Series Electric Non-Spring Return Actuators are designed to control dampers within HVAC systems, offering reliable performance and versatile control options.

Key Features:

• Models with Automatic Signal Input Detection, supporting on/off, floating, and proportional control with adjustable span and offset.
• Line voltage on/off and floating models available.
• High-speed on/off and floating models for rapid response.
• Self-calibrating input signal to precisely adjust stroke.
• Electronic stall detection for enhanced safety and longevity.

Figure 1: Johnson Controls M9310-HGA-2 Damper Actuator, showing the main unit with wiring and connection ports.

2. Setup and Installation

The M9310-HGA-2 actuator is designed for direct mounting, eliminating the need for external damper linkage in most applications. Ensure all local and national electrical codes are followed during installation.

2.1 Direct Mounting

The actuator can be directly coupled to a damper shaft using its universal clamp. It supports:

• Round damper shafts from 3/8 in. (10 mm) up to 1-1/16 in. (27 mm).
• Square damper shafts from 3/8 in. (10 mm) up to 3/4 in. (19 mm).

Figure 2: Close-up view of the universal clamp mechanism on the actuator, designed for direct shaft mounting.

2.2 Remote Mounting and Accessories

For applications where direct coupling to the damper shaft is not feasible, an accessory crank arm and remote mounting kit are available. These kits provide flexibility for installation in various configurations.

2.3 Auxiliary Switch Installation

An optional line voltage auxiliary switch kit can be field-installed. This switch can be used to indicate an end-stop position of the damper or to perform additional switching functions within the selected rotation range.

3. Operating Instructions

The M9310-HGA-2 actuator supports various control strategies, including on/off, floating, and proportional control, thanks to its Automatic Signal Input Detection feature. The actuator automatically recognizes the input signal type and adjusts its operation accordingly.

3.1 Control Modes

• On/Off Control: The actuator drives the damper to either a fully open or fully closed position based on a simple binary signal.
• Floating Control: The actuator moves the damper incrementally in response to pulsed signals, allowing for intermediate positions.
• Proportional Control: The actuator positions the damper proportionally to an analog input signal (e.g., 0-10VDC or 4-20mA), providing precise modulation.

3.2 Self-Calibration and Stall Detection

The actuator features a self-calibrating input signal function, which optimizes the stroke adjustment for precise damper positioning. Electronic stall detection is integrated to protect the actuator from damage in case of an obstruction or excessive load, ensuring reliable long-term operation.

4. Maintenance

The Johnson Controls M9310-HGA-2 Damper Actuator is designed for minimal maintenance. Regular inspection is recommended to ensure optimal performance and longevity.

4.1 General Inspection

• Periodically check all electrical connections for tightness and signs of corrosion.
• Inspect the damper shaft and actuator coupling for any signs of wear or slippage.
• Ensure the damper operates smoothly without excessive resistance.

4.2 Environmental Protection

For applications in harsh environments, the M9300 actuators offer an optional NEMA 4X/IP66 weather shield. If installed, periodically inspect the weather shield for integrity to ensure continued protection against dust, water, and corrosion.

5. Troubleshooting

This section provides general guidance for common issues. For complex problems, consult a qualified HVAC technician or contact Johnson Controls technical support.

5.1 Actuator Not Responding

• Verify that the actuator is receiving the correct power supply (AC/DC 24V).
• Check the control signal input for proper voltage or current levels.
• Ensure all wiring connections are secure and correctly terminated.

5.2 Damper Not Moving Fully

• Inspect the damper for mechanical obstructions or excessive friction.
• Confirm the actuator is correctly sized for the damper torque requirements.
• Check for proper calibration of the input signal if using proportional control.

6. Specifications

Detailed technical specifications for the M9310-HGA-2 Damper Actuator are provided below.

Figure 3: Product label detailing model number (M9310-HGA-2) and electrical specifications (AC/DC 24V 50/60 Hz, 7.9 VA Class 2).

7. Warranty and Support

For information regarding product warranty, technical support, or service, please refer to the official Johnson Controls website or contact their customer service department. Keep your purchase receipt and product model number handy when seeking support.