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How do I install the FJ4 Fan Coil Unit in a downflow setup and ensure proper condensate drainage?

1Answers
LaJuniper
12/17/2025, 11:41:07 AM

Installing the FJ4 Fan Coil Unit in a downflow configuration requires careful attention to detail. Here’s a guide to help you through the process and ensure efficient condensate drainage:

  1. Downflow Setup Essentials:

    • Begin by obtaining the necessary accessory downflow kit and base kit. These are essential for converting the unit.
    • Place a fireproof, resilient gasket (1/8" to 1/4" thick) between the ductwork, the unit itself, and the floor to ensure a proper seal.

  2. Conversion Steps for A-Coil Units:

    • Access the unit's internal components by removing the blower and coil access panels.
    • Detach the metal clip that secures the fitting panel to the condensate pan, and then remove the fitting panel.
    • Unclip the A-coil from the unit, carefully sliding the coil and pan assembly out.
    • Relocate the horizontal drain pan support bracket from the left side of the unit’s coil support rail to the right side.
    • Follow the detailed instructions in the FJ4 manual to correctly convert the air seal assembly for a horizontal right configuration.
    • Install the horizontal pan on the right side of the coil assembly, and then carefully slide the coil assembly back into the casing.

  3. Condensate Drain Management:

    • Proper condensate drainage is vital to prevent water damage. Install both primary and secondary drain lines and incorporate appropriately sized condensate traps.
    • Position the outlet of each trap below its connection to the condensate pan to avoid any overflow issues.
    • Ensure the condensate drain lines have a downward slope, with a minimum pitch of 1 inch for every 10 feet of length.
    • Always adhere to local building codes for additional requirements or safety precautions.

By following these steps, you can successfully install your FJ4 Fan Coil Unit in a downflow configuration, promoting longevity and optimal performance.

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