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Bard part number 8612-023B is an OEM remote temperature sensor with 35 foot lead wires used with Bard MC control series lead lag controllers, including the MC4002 family. This sensor provides accurate space or remote temperature feedback to the controller so it can stage and balance operation properly across connected Bard wall mount air conditioners, which helps maintain stable comfort and reliable changeover logic when multiple units are managed. It is the updated replacement for 8612-023A, and it is commonly installed as an optional field sensor where the controller is not located at the ideal sensing point, so confirm controller compatibility and follow the Bard wiring diagram for correct placement and polarity.