1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the ICM Controls ICM289 Furnace Control Circuit Board. The ICM289 is a microprocessor-based control designed as a direct replacement for various Lennox, Armstrong, BCC1, BCC2, and BCC3 circuit boards, including models 48K98 and 45K48. It manages the inducer fan motor, blower fan, and monitors limit switches, ensuring efficient and safe furnace operation. Please read this manual thoroughly before attempting any installation or service.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
- Always disconnect the main power supply to the furnace before installing or servicing the control board.
- Ensure all wiring connections are secure and comply with local and national electrical codes.
- Do not operate the furnace with damaged wiring or components.
- Wear appropriate personal protective equipment (PPE) during installation and service.
- This control board operates with line voltage. Exercise extreme caution.
3. Product Overview
The ICM Controls ICM289 is a robust and reliable replacement control board for various HVAC systems. Its microprocessor-based design ensures precise control and monitoring of furnace functions.
Image of the ICM Controls ICM289 furnace control circuit board, showing its compact design and various connection points.
Key Features:
- Direct replacement for Lennox BCC1, BCC2, BCC3, 48K98, and 45K48 circuit boards.
- Controls inducer fan motor and blower fan.
- Monitors limit switches for safety.
- Microprocessor-based design for reliable performance.
- Compatible with all 24 VAC thermostats.
4. Installation
Important: Installation should only be performed by a qualified HVAC technician. Ensure all power to the furnace is disconnected before proceeding.
- Power Disconnection: Turn off the main power supply to the furnace at the service panel. Verify power is off using a voltage meter.
- Access Old Board: Locate and carefully remove the access panel to the furnace control area.
- Document Wiring: Before disconnecting any wires, take clear photographs or make a detailed diagram of all existing wiring connections to the old control board. Label each wire if necessary.
- Remove Old Board: Disconnect all wires and mounting screws securing the old control board. Carefully remove the old board.
- Install New Board: Position the ICM289 control board in the same location as the old board. Secure it with the appropriate mounting screws.
- Connect Wiring: Refer to your documented wiring diagram and the wiring diagram provided with the ICM289 (or the furnace manufacturer's diagram) to connect all wires to the new board. Ensure all connections are tight and correct.
- Verify Connections: Double-check all wiring connections for accuracy and security.
- Restore Power: Replace the furnace access panel. Restore power to the furnace at the service panel.
- Test Operation: Initiate a heating or cooling cycle to verify proper operation of the furnace and the new control board.
5. Wiring Diagram
A detailed wiring diagram is typically included with the product packaging or can be found in the furnace manufacturer's service manual. Always refer to the specific wiring diagram for your furnace model and the ICM289 to ensure correct connections. Incorrect wiring can lead to damage to the control board, furnace, or personal injury.
Note: Due to variations in furnace models and configurations, a universal wiring diagram cannot be provided here. Always consult the specific documentation for your system.
6. Operation
The ICM289 control board operates automatically in conjunction with your 24 VAC thermostat to manage the furnace's heating and cooling cycles. It controls the sequence of operations, including:
- Inducer Motor Activation: Initiates the inducer motor to vent combustion gases.
- Ignition Sequence: Manages the ignition process for the main burner.
- Heat Blower Operation: Activates the heat blower after a 45-second ON delay to allow the heat exchanger to warm up. The heat blower OFF delay can be set to 90, 150, 210, or 270 seconds, allowing for efficient heat distribution.
- Cool Blower Operation: Activates the cool blower with a 1-second ON delay and a 1-second OFF delay for immediate cooling response.
- Safety Monitoring: Continuously monitors limit switches and other safety devices to prevent unsafe operating conditions.
The board's internal logic handles the precise timing and sequencing required for optimal furnace performance.
7. Troubleshooting
Before attempting any troubleshooting, ensure the main power to the furnace is disconnected. If you are not a qualified technician, contact a professional for assistance.
| Problem | Possible Cause | Solution |
|---|---|---|
| Furnace not starting | No power, thermostat issue, safety limit tripped, incorrect wiring. | Check circuit breaker. Verify thermostat settings. Inspect limit switches. Review wiring connections. |
| Blower fan not running | Blower motor fault, capacitor issue, control board fault, wiring error. | Check blower motor and capacitor. Verify wiring to the control board. |
| Inducer motor not running | Inducer motor fault, pressure switch issue, control board fault. | Check inducer motor. Inspect pressure switch hose and connections. |
| Intermittent operation | Loose connections, faulty sensor, intermittent safety trip. | Tighten all wiring connections. Test sensors. Check for recurring safety trips. |
Many control boards include diagnostic LED indicators. Consult your furnace's service manual for specific flash codes and their meanings.
8. Specifications
| Parameter | Value |
|---|---|
| Model Number | ICM289 |
| Line Voltage Range | 98-132 VAC @ 60Hz |
| Cool Blower Rating | 20A @ 120 VAC |
| Heat Blower Rating | 20A @ 120 VAC |
| Inducer Motor Rating | 5A @ 120 VAC |
| Cool Blower ON Delay | 1 second |
| Cool Blower OFF Delay | 1 second |
| Heat Blower ON Delay | 45 seconds |
| Heat Blower OFF Delay | 90, 150, 210, 270 seconds (selectable) |
| Dimensions (L x W x H) | 4.25 x 5.625 x 1 inches (approximate) |
| Weight | 0.01 ounces (product weight, packaging may vary) |
| Cross Reference | Lennox BCC1, BCC2, BCC3, 48K98, 45K48 |
9. Warranty and Support
For specific warranty information regarding your ICM Controls ICM289 circuit board, please refer to the documentation included with your purchase or visit the official ICM Controls website. Warranty terms typically cover manufacturing defects for a specified period from the date of purchase.
For technical support, installation assistance, or to inquire about replacement parts, please contact ICM Controls customer service directly. Contact information can usually be found on the product packaging or their official website.
Note: Unauthorized repairs or modifications may void the product warranty.
