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Bard part 8301-051-001A is a small programmed micro PC used in Bard-Link LC Series PLC lead/lag controllers, specifically the LC1000 and LC1500 platforms, to manage staging and sequencing between paired Bard wall-mount air conditioners for reliable primary and standby operation. This is an OEM Bard control component intended to restore proper controller logic and communication when replacing a failed or damaged programmed module, and it is best matched by confirming your controller model and revision details before ordering to ensure the correct programmed version for your application.