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Bard part 800-0276 is an OEM TXV assembly used in Bard wall mounted air conditioners to meter refrigerant into the evaporator coil and maintain stable superheat across varying loads. A properly operating thermal expansion valve helps prevent coil flooding and supports consistent cooling performance, so this is a common replacement when diagnosing erratic suction pressure, poor capacity, or icing tied to improper refrigerant feed. Because TXVs are application specific for tonnage, refrigerant type, and connection style, match the exact Bard part number 800-0276 to your unit model and serial range before ordering to ensure correct fit and operation.