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Bard 8301-068-004CBX is an OEM UPC3 control board assembly for Bard FUSION-TEC WR series wall-mount units, supplying the onboard logic used to monitor inputs and manage key unit functions and communications on the network. This board is a critical Electrical/Controls component that ties together features like unit enable, dirty filter and airflow proving inputs, alarm outputs, and service connectivity used during setup and troubleshooting. Because Bard identifies these UPC3 boards by software revision, confirm the correct board and software version for your specific WR model before ordering, and follow Bard guidance to keep controller and unit PLC software aligned when replacing a board.