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The Bard 1804-0242 Low Pressure Ctrl Assy 27 Psig is an OEM refrigerant-side safety control used on Bard wall-mount air conditioners and heat pumps to monitor suction (low-side) pressure and help protect the compressor during low refrigerant charge, airflow problems, or cold-start conditions. When system pressure drops to the control’s setpoint, it signals the unit controls to interrupt compressor operation to prevent damage, nuisance freeze-ups, and repeated short cycling. Because pressure control setpoints and wiring arrangements can vary by unit series and vintage, confirm fit by matching the Bard part number 1804-0242 to your model and serial before ordering.