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The Bard S8602-056-0002A Programmed Econ Module-Service is an OEM economizer control module used in Bard HVAC systems to manage economizer operation so the unit can bring in outdoor air for ventilation and free cooling when conditions are right. This service module is a direct replacement control designed to restore proper economizer response, damper control logic, and overall unit operation when an existing module has failed or is behaving intermittently. Because economizer controls can vary by unit series and control package, confirm your Bard model and the exact control module part number before ordering to ensure correct programming and plug-in compatibility.