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Bard MV5000-B is an OEM lead lag controller assembly used to automatically sequence two Bard wall mount air conditioners so one unit leads and the other lags, helping balance runtime while maintaining stable shelter or equipment room temperature control. This controller supports economizer shutdown and is supplied with the B alarm board to provide the alarm and status outputs commonly required for telecom and critical cooling applications. It is designed for proper low voltage integration with Bard equipment and is the correct choice when you need to replace a failed controller or update an older lead lag control package with a like for like Bard part number to preserve intended staging, changeover, and alarm functionality.