ICM Controls ICM289 Lennox OEM Furnace Control Board Replacement User Manual

Introduction

This manual provides instructions for the installation, operation, and maintenance of the ICM Controls ICM289 Furnace Control Board. The ICM289 is designed as a direct replacement for Lennox BCC1, BCC2, and BCC3 series circuit boards, offering form, fit, and functional compatibility. This microprocessor-based control board manages the inducer fan motor, blower fan, and monitors limit switches, ensuring proper furnace operation. It is compatible with all 24 VAC thermostats.

Safety Information

WARNING: Before attempting any installation, maintenance, or troubleshooting, ensure that the main power supply to the furnace is disconnected at the circuit breaker or fuse box. Failure to do so can result in electrical shock, personal injury, or death. Installation should only be performed by qualified personnel. Always wear appropriate personal protective equipment.

• Disconnect all power to the furnace before servicing.
• Verify all wiring connections are secure and correct before restoring power.
• Do not bypass safety devices.

Setup and Installation

The ICM289 board is designed for straightforward replacement of existing Lennox BCC1, BCC2, and BCC3 control boards. Follow these steps carefully:

1. Power Disconnection: Ensure all electrical power to the furnace is completely disconnected.
2. Documentation: Before removing any wires, take clear photographs of the existing control board and its wiring connections. Label each wire precisely as it connects to the old board. This documentation is crucial for correct re-installation.
3. Old Board Removal: Carefully disconnect all wires from the old control board. Unmount the old board from the furnace chassis.
4. New Board Mounting: Position the ICM289 replacement board. It features plastic clip-spacers designed to align with the mounting holes used by the original BCC3 boards. Secure the new board in place. The rear PCB of the ICM289 has a protective coating to prevent arcing to the metal mounting surface.
5. Wiring Connection: Refer to your photographs and labels. Connect each wire from the furnace to its corresponding terminal on the ICM289 board. While most connections are identical, if an adapter is provided for a specific terminal, ensure it is used correctly. Verify all connections are firm and correctly seated.
6. Power Restoration: Once all connections are verified, restore power to the furnace.
7. Initial Test: Initiate a heating cycle to confirm proper operation of the furnace, including the inducer fan, igniter, burners, and blower fan.

Image of the ICM Controls ICM289 furnace control board, showing its various terminals and components. This board is a direct replacement for Lennox BCC1, BCC2, and BCC3 series.

Operating Instructions

The ICM289 furnace control board operates automatically in conjunction with your 24 VAC thermostat. Once installed and power is restored, the board will manage the furnace's heating and cooling cycles based on thermostat demands.

• Heating Cycle: Upon a call for heat from the thermostat, the board initiates the inducer fan, verifies safety switches, activates the igniter, opens the gas valve, and then engages the blower fan once the heat exchanger is sufficiently warm.
• Cooling Cycle: Upon a call for cool, the board activates the blower fan to circulate air through the cooling coil.
• Fan Operation: The board controls the blower fan for both heating and cooling, as well as continuous fan operation if selected on the thermostat.

Maintenance

Regular maintenance of your furnace system is essential for the longevity and proper functioning of the control board and the entire unit. While the control board itself requires no direct user maintenance, certain system conditions can impact its performance and lifespan.

• Airflow Management: Ensure proper airflow through your furnace. Restricted airflow can cause the blower fan to work harder, potentially leading to overheating of the control board components. Regularly check and replace air filters.
• Ventilation: Keep all supply and return air vents open and unobstructed. Closed vents can contribute to restricted airflow.
• AC Condenser: If applicable, ensure your outdoor AC condenser coil is clean and free of debris to maintain efficient system operation.
• Professional Inspection: Schedule annual professional inspections of your furnace system to identify and address potential issues before they lead to component failure.

Troubleshooting

If your furnace is not operating correctly after installing the ICM289 board, consider the following troubleshooting steps:

• No Power:
  • Check the circuit breaker or fuse for the furnace.
  • Ensure the furnace power switch is in the "ON" position.
  • Verify all low-voltage thermostat wires are securely connected.
• Furnace Not Heating:
  • Confirm the thermostat is set to "HEAT" and the temperature is above the ambient room temperature.
  • Check for any error codes on the control board (refer to furnace manufacturer's documentation for code interpretation).
  • Ensure the gas supply valve to the furnace is open.
• Blower Fan Not Operating Correctly (e.g., not turning on, not shutting off):
  • Re-verify all blower motor wiring connections to the control board.
  • Check for any obstructions in the blower assembly or ductwork.
  • Ensure the thermostat fan setting is correct (AUTO vs. ON).
• Intermittent Operation:
  • Inspect all wiring for loose connections or signs of damage.
  • Ensure limit switches and other safety devices are functioning correctly (consult a professional).

If troubleshooting steps do not resolve the issue, it is recommended to contact a qualified HVAC technician for further diagnosis and repair.

Specifications

Warranty and Support

For specific warranty information regarding your ICM Controls ICM289 Furnace Control Board, please refer to the documentation provided with your purchase or contact ICM Controls directly. For technical support or assistance with installation and troubleshooting, it is recommended to consult a qualified HVAC professional or reach out to ICM Controls customer service.

Manufacturer: ICM Controls

Note: This manual provides general guidance. Always refer to your specific furnace manufacturer's instructions and local electrical codes.