Garrison 920915 Control Board

1. Product Overview

The Garrison 920915 Control Board is an Original Equipment Manufacturer (OEM) replacement part designed for single-stage gas furnaces. This board manages the critical functions of your furnace, including ignition, fan operation, and various safety protocols, ensuring efficient and reliable heating.

It is essential to verify compatibility with your specific furnace model before installation. This manual provides guidance for proper installation, operation, and maintenance to ensure the longevity and correct function of your furnace system.

2. Safety Information

WARNING: Installation and servicing of heating equipment can be hazardous due to gas and electrical components. This product should only be installed and serviced by a qualified HVAC technician. Failure to follow these instructions could result in property damage, personal injury, or death.

• Disconnect all electrical power to the furnace before installing or servicing the control board.
• Ensure gas supply is turned off before working on gas components.
• Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
• Verify all wiring connections are secure and correct according to the furnace manufacturer's specifications.
• Do not bypass any safety devices.

3. Setup and Installation

This section outlines the general steps for replacing a furnace control board. Always refer to your specific furnace manufacturer's service manual for detailed instructions and wiring diagrams.

1. Power Disconnection: Turn off all electrical power to the furnace at the main service panel. Verify power is off using a voltage tester. Turn off the gas supply to the furnace.
2. Access the Control Board: Open the furnace access panel to locate the existing control board.
3. Document Wiring: Before disconnecting any wires, take clear photographs of all wiring connections to the existing board. Label wires if necessary to ensure correct re-connection.
4. Disconnect Wires: Carefully disconnect all wires from the old control board. Note the type and location of each connector.
5. Remove Old Board: Unmount the old control board from its housing. This may involve unscrewing fasteners or releasing clips.
6. Install New Board: Mount the Garrison 920915 control board in the same location as the old board. Ensure it is securely fastened.
7. Connect Wires: Using your documented photos and labels, carefully re-connect all wires to the new control board. Double-check each connection for accuracy and security.
8. Close Access Panel: Securely close the furnace access panel.
9. Restore Power: Restore electrical power and gas supply to the furnace.
10. Test Operation: Initiate a heating cycle to verify proper furnace operation. Observe for normal ignition, fan activation, and temperature control.

This image displays the Garrison 920915 control board, highlighting its layout, connection points, and electronic components. It serves as a visual reference for installation and wiring.

4. Operating Instructions

The Garrison 920915 control board operates automatically in conjunction with your furnace's thermostat and other components. Once installed correctly, the furnace should respond to thermostat commands as follows:

• When the thermostat calls for heat, the control board initiates the sequence: inducer motor activation, pressure switch verification, igniter activation, gas valve opening, and flame sensing.
• Upon successful ignition, the main blower fan will activate after a short delay to allow the heat exchanger to warm up.
• The control board continuously monitors safety limits and flame presence during the heating cycle.
• When the thermostat's set temperature is reached, the control board will shut down the gas valve and, after a cool-down period, turn off the main blower fan.

Refer to your furnace's primary user manual for specific operating modes and thermostat settings.

5. Maintenance

The Garrison 920915 control board itself requires no routine user maintenance. Its proper function is dependent on the overall health of your furnace system. To ensure optimal performance and longevity of your furnace and its control board, consider the following general maintenance practices for your furnace:

• Regular Filter Replacement: Replace or clean your furnace air filter monthly or as recommended by your furnace manufacturer. A dirty filter restricts airflow, causing the furnace to work harder and potentially leading to component stress.
• Annual Professional Inspection: Schedule a professional HVAC technician to inspect and service your furnace annually. They can identify and address potential issues before they lead to component failure.
• Keep Vents Clear: Ensure all supply and return air vents are unobstructed.
• Clean Flame Sensor: A dirty flame sensor can cause intermittent furnace operation. This is typically a task for a qualified technician.

6. Troubleshooting

If your furnace is experiencing issues after control board installation, or if you suspect a control board malfunction, consider the following:

• No Power to Furnace: Check the circuit breaker for the furnace. Ensure the furnace access panel is fully closed, as many furnaces have safety switches that prevent operation when open.
• Furnace Not Starting: Verify the thermostat is set to 'Heat' and the temperature is above the ambient room temperature. Check all wiring connections to the control board for looseness or incorrect placement.
• Blower Fan Not Operating: If the furnace heats but the fan does not come on, check the fan settings on your thermostat. If set to 'Auto', the fan should engage after a heat cycle. If set to 'On', it should run continuously.
• Intermittent Operation: This can be caused by various issues, including a dirty flame sensor, faulty limit switches, or pressure switch problems. These often require professional diagnosis.
• Diagnostic Codes: Many control boards have LED indicator lights that flash specific codes to indicate a fault. Consult your furnace's service manual for a list of diagnostic codes and their meanings.

Important: For complex issues or if you are unsure about any troubleshooting step, contact a qualified HVAC technician. Attempting repairs without proper knowledge can be dangerous and may void warranties.

7. Specifications

This image provides a visual representation of the control board's physical dimensions, indicating its approximate size for compatibility checks.

8. Warranty and Support

Warranty: The manufacturer states 'Na.' regarding warranty information for this product. Please refer to the retailer or your purchase documentation for any applicable warranty details.

Support: For technical assistance, troubleshooting beyond the scope of this manual, or professional installation, it is recommended to contact a qualified HVAC technician. For product-specific inquiries, you may also reach out to the manufacturer, Garrison, through their official channels.