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The Bard S8406-112 Low Ambient Control 350#/225# Box is an OEM pressure-based control used on select Bard wall-mounted air conditioners to help maintain stable refrigerant head pressure during low outdoor ambient cooling operation. It is commonly referenced as an optional low ambient control switch and is intended to cycle condenser fan operation based on system pressure to support reliable cooling performance when temperatures drop. Because exact application can vary by unit series and vintage, confirm compatibility by matching the part number to your Bard model and serial, or checking the unit parts list, before ordering.