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Bard part number 8406-112 is an OEM low ambient control set up for 350 psi and 225 psi cut-in/cut-out style operation, used to help Bard wall-mount air conditioners maintain stable cooling performance when outdoor temperatures drop and head pressure control becomes critical. This control works with the unit’s refrigeration circuit to keep pressures in the proper range for reliable condenser operation, reducing issues like short cycling, nuisance safeties, and poor cooling in cold weather service. If you are replacing a failed or out-of-spec control, matching the 350#/225# pressure settings is key for correct system behavior and to keep the unit operating the way Bard engineered it.