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The Bard 1804-0243 Low Pressure Ctrl Assy 15 Psig is an OEM low pressure safety/control assembly used in Bard wall mounted air conditioners and heat pumps to monitor suction pressure and protect the refrigeration circuit during abnormal operating conditions such as low charge, restricted airflow, or icing. When the low side pressure drops to the control point, this switch assembly helps prevent continued compressor operation that can lead to nuisance trips or component damage, making it a smart replacement when you are troubleshooting intermittent cooling, low pressure faults, or a failed pressure switch. For best results, confirm the exact part number and pressure rating against your unit model and wiring diagram before ordering to ensure proper fit and correct cut out behavior.