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The Bard S8602-056-0003 is a programmed economizer control module used to manage economizer operation so your Bard wall-mount or packaged unit can bring in outdoor air for “free cooling” when conditions are right, while maintaining correct ventilation control and stable changeover back to mechanical cooling. As an OEM Bard service module, it is intended to match the unit’s factory economizer logic and wiring expectations, which helps reduce nuisance faults and restores proper economizer performance after a failed control. Because programmed economizer modules can vary by unit series, controls package, and outdoor air options, verify the exact Bard model and serial information (and any control board or economizer assembly part numbers) before ordering to ensure correct fit and operation.