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Bard part 8406-031 is an OEM low pressure control used in Bard wall-mounted air conditioners and related packaged equipment to help protect the refrigeration circuit by monitoring suction pressure and interrupting compressor operation if pressure drops to an unsafe level. A properly working low pressure control helps prevent nuisance freeze-ups, guards against low charge or airflow-related issues, and supports stable cooling performance during changing load conditions. Because low pressure controls can vary by trip and reset characteristics across model families, confirm the exact Bard unit model and serial number or the unit wiring diagram before ordering to ensure correct fit and proper control operation.