Gas fireplaces are designed to provide both comfort and ambiance, but without a blower, the heat they produce often remains trapped within the firebox. The Lennox FBK-250 fireplace blower kit is a high-quality solution to this problem, designed to increase the efficiency of gas fireplaces by circulating warm air into the surrounding space. This article provides a detailed, step-by-step technical guide to the installation of the FBK-250, based on the official product documentation and installation instructions provided by the manufacturer.
Overview of the FBK-250 Blower Kit
The FBK-250 is a variable-speed blower kit designed for use with Lennox gas fireplaces, including models such as the MPD-3530CPM and various legacy LHP models. The kit is engineered to improve heat output by drawing in room air, heating it as it passes over the firebox, and then expelling the warmed air through the upper panel or louvers of the fireplace. This process ensures that the heat generated by the fireplace is more effectively distributed into the living space.
The FBK-250 includes several components:
- Blower Assembly: The core component that circulates air.
- Variable Speed Control Module: Allows users to adjust the speed of the blower using a rheostat, similar to a light dimmer.
- Thermodisc (Thermo Snap Switch): An automatic heat sensor that turns the blower on when the fireplace reaches 120°F and off when it drops to 90°F.
- Heat Shield Bracket: Provides structural support and insulation.
- Cord Set with 3-Prong Power Cord: For safe and grounded electrical operation.
- Foam Dampening Pad and Velcro Strips: Help reduce noise and vibration.
- Conversion Packet and Installation Instructions: For proper setup.
The blower is constructed with ball bearings and a thermal safety switch, ensuring durability and safety. It operates at a maximum of 3000 RPM, with a 135 CFM (cubic feet per minute) airflow capacity, and is powered by a 115V, 60Hz motor with a 0.74-amp draw. The blower wheel has a width of 9.45 inches and a diameter of 2.56 inches.
Key Technical Features and Specifications
The FBK-250 is designed to meet the specifications of original equipment for Lennox fireplaces. It includes anti-vibration impellers and vortex regulation tabs to maintain steady airflow and reduce noise. The blower is manufactured with quality components and assembled in the Midwest, ensuring reliability and compatibility with Lennox models.
The motor is equipped with a thermal safety switch that activates if the motor becomes too hot, preventing damage or electrical hazards. The bearing construction uses ball bearings, which are known for their longevity and smooth operation compared to sleeve bearings.
The blower operates at 3000 RPM under no load, but under normal operating conditions (with load), it runs at approximately 1400 RPM. This rotational speed is sufficient to circulate air effectively without causing excessive noise. The blower rotates in a counter-clockwise (CCW) direction, which is standard for many HVAC and heating applications.
The variable speed control allows users to adjust the airflow based on their comfort preferences. At lower speeds, the blower operates quietly, making it suitable for ambient heating. At higher speeds, it provides more aggressive heat distribution, ideal for colder environments or larger rooms.
Compatibility and Warranty
The FBK-250 is compatible with a range of Lennox gas fireplaces, including the Altair, Aries, Compass, DRT, DRL, DVF, Eros, Gemini, Libra, MHD, and various legacy LHP models. The manufacturer notes that the instruction manual may not include specific details for every model, so users are encouraged to verify compatibility with their particular fireplace.
The blower kit includes a 1-year comprehensive warranty, covering defects in materials and workmanship. This warranty applies to the blower, speed control module, and all included components. Users are advised to retain their receipt and contact the manufacturer or authorized dealer for warranty claims.
Installation Requirements and Precautions
Before beginning the installation of the FBK-250, it is essential to ensure that the fireplace is completely off and cooled down. The installation must be performed by a qualified technician or someone with the appropriate technical knowledge, as failure to follow the instructions can result in personal injury or damage to the appliance.
The installation involves the following key steps:
- Turn Off and Cool the Fireplace: Ensure the fireplace is not in operation and has cooled to room temperature.
- Disconnect Power and Gas Supply: If the fireplace is connected to 120V power, disconnect the power supply. Shut off the gas supply to prevent accidental ignition.
- Access the Lower Compartment: Open the lower compartment door by either sliding or removing it, depending on the model. Some fireplaces require the removal of the entire facade.
- Install the Blower Assembly: Secure the blower beneath the firebox using the provided screws and heat shield bracket. Ensure the blower is properly grounded using the three-prong power cord.
- Mount the Speed Control Module: Attach the variable speed control module to the designated location using the two #6-32 screws. Connect the wiring according to the diagram in the instruction manual.
- Reinstall Barriers and Panels: Reattach any removed barriers or panels to protect against burns from the hot glass. These are critical for safety and must be in place before operating the fireplace.
- Verify Proper Operation: Once installed, turn on the fireplace and observe the blower operation. Ensure the thermodisc activates at the correct temperature and that the speed control functions as expected.
The installation instructions emphasize the importance of cut-resistant gloves and protective clothing during the process. Users are also advised to consult the installation and operation manual that came with the fireplace for additional guidance and precautions.
Safety and Grounding Requirements
The FBK-250 must be grounded for safe operation. The blower includes a three-prong grounding plug, which must be connected to a standard, grounded outlet. If the power cord is damaged or needs replacement, a new cord must also have a three-prong grounding plug to prevent electrical shock hazards.
Failure to follow proper grounding procedures can result in electrical shock or personal injury. Users should never attempt to bypass or remove any grounding components. The manufacturer explicitly states that failure to connect all wires as indicated may cause electrical shock or personal injury.
Additionally, the installation instructions note that the blower must be securely mounted to prevent vibration or movement during operation. The use of foam dampening pads and Velcro strips is recommended to reduce noise and ensure a stable installation.
Troubleshooting and Support
If the blower does not operate as expected after installation, users are advised to:
- Check the Power Supply: Ensure the blower is connected to a grounded outlet and that the power is turned on.
- Verify Wiring Connections: Confirm that all wires are connected correctly and securely.
- Test the Thermodisc: If the blower does not activate when the fireplace heats up, the thermodisc may be faulty and should be replaced.
- Inspect the Speed Control Module: If the speed control does not respond to adjustments, it may be defective or improperly installed.
- Contact Support: If problems persist, users should contact their local dealer or the manufacturer directly for assistance.
The manufacturer also provides a conversion packet with the blower kit, which may include additional technical support and documentation for specific models. Users are encouraged to retain this information for future reference.
User Feedback and Field Experience
User reviews highlight the ease of installation and the improved heating efficiency of the FBK-250. Many users mention that the variable speed control allows them to adjust the airflow based on their comfort preferences. At lower speeds, the blower is nearly silent, making it ideal for quiet, ambient heating. At higher speeds, it provides more aggressive heat distribution, suitable for colder rooms or larger spaces.
Several users also note that the thermodisc functions reliably, automatically turning the blower on and off based on the fireplace temperature. This feature ensures that the blower only operates when the fireplace is generating sufficient heat, improving energy efficiency and reducing unnecessary noise.
Installation time is generally reported to be quick and straightforward, with many users completing the process in under an hour. A YouTube video from Top Homeowner is mentioned as a helpful visual aid for those unfamiliar with the installation process. The manufacturer also receives praise for its customer service, with users noting that the support team was able to assist them in selecting the correct blower for their specific fireplace model.
Conclusion
The Lennox FBK-250 fireplace blower kit is a high-quality, reliable solution for improving the heat output of gas fireplaces. With its variable speed control, thermodisc, and thermal safety switch, it provides a safe and efficient way to circulate warm air into living spaces. The installation process, while requiring some technical knowledge, is generally straightforward and can be completed in under an hour with the right tools and instructions.
Users who have installed the FBK-250 report high satisfaction with the performance and ease of use of the blower. The kit includes all necessary components for a complete installation, including the blower, speed control module, thermodisc, and mounting hardware. The manufacturer also provides a 1-year warranty, offering peace of mind for users.
For those considering an upgrade to their gas fireplace system, the FBK-250 is a recommended option. It is compatible with a wide range of Lennox models and is designed to meet the specifications of original equipment. With proper installation and maintenance, the FBK-250 can significantly enhance the heating efficiency and comfort of any home.