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Bard 8602-056-0004 is an OEM programmed economizer control module with enthalpy capability used on compatible Bard wall mount packaged units to manage economizer operation based on outdoor air conditions. Replacing a failed or corrupted module helps restore proper damper control and economizer sequencing so the unit can bring in outdoor air when conditions are suitable and reduce unnecessary mechanical cooling. Because programmed economizer modules are application specific, match this part number to the unit model and existing economizer module before ordering to ensure correct plug-in fit and proper control logic after installation.