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Bard part number 8301-085-001A (UPC3 - LV1000) is an OEM programmable logic controller module used in Bard LV1000 lead lag control systems that coordinate staging, rotation, alarms, and overall operation for up to four compatible Bard wall-mount air conditioners in telecom and shelter applications. This replacement PLC is supplied programmed for the LV1000 platform, and the trailing letter indicates the software revision, so matching the correct version and updating site software as recommended is important to restore stable communications and proper sequencing after a control failure. As a genuine Bard control component, it is built for reliable, repeatable operation in the LV1000 controller assembly when installed by a qualified technician and verified against the unit and controller documentation.