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The Bard 905-0636 expansion valve assembly (TXV) is an OEM refrigerant metering component used in select Bard wall mounted packaged air conditioner models to regulate liquid refrigerant flow into the evaporator based on load, helping maintain proper superheat and stable cooling performance. When a system shows symptoms like coil frosting, hunting, or poor capacity tied to metering issues, replacing the TXV with the correct Bard part number helps restore the factory-designed refrigerant control and protects the compressor from improper evaporator feeding. Match Bard 905-0636 to your unit model and serial information to confirm application before ordering, since TXV selection is specific to equipment configuration and refrigerant circuit design.