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The Bard S8301-079-0002 is a programmed electronic expansion valve (EEV) control board service part used on select Bard commercial HVAC equipment to regulate EEV operation for stable refrigerant metering and proper system performance. As an OEM Bard control component, it is intended to restore correct valve control logic when an existing EEV controller has failed, is reporting alarms, or will not maintain proper operating conditions. Because this board is programmed for specific applications, confirm the exact unit model and wiring diagram before ordering, and match the service part number precisely to avoid compatibility issues during replacement.