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The Bard S8602-056-0001 is an OEM programmed economizer (Econ) module used in Bard wall-mount HVAC equipment to manage economizer operation and help the unit bring in outdoor air correctly when conditions are right. If your economizer is not responding, stuck in an incorrect position, or failing service checks, replacing the control module with the correct programmed version is a common fix because calibration and logic are specific to the Bard economizer setup. This is an electrical/control component intended to restore proper economizer enable, damper control behavior, and overall ventilation sequence when paired with the correct Bard unit and economizer assembly, so match the full part number and confirm unit model compatibility before ordering.