{"product_id":"oem-goodman-piston-kit-for-wghp4324aab-b1789857-1","title":"OEM Goodman Piston Kit for WGHP4324AAB — B1789857","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789857 Piston Kit\u003c\/strong\u003e is a genuine OEM metering device built for \u003cstrong\u003eWGHP4324AAB\u003c\/strong\u003e systems. The fixed-orifice piston (flowrator) controls the rate of liquid refrigerant entering the evaporator or condenser coil, setting the system's superheat and subcooling. A worn, clogged, or incorrectly sized piston causes poor cooling capacity, frost on the coil, or high head pressure.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1789857\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Fixed-orifice Metering Piston (Flowrator)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Model:\u003c\/strong\u003e WGHP4324AAB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Refrigerant metering \/ superheat control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e Direct OEM replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe orifice bore on the OEM B1789857 is precision-drilled to a diameter matched to this unit's tonnage. Generic pistons in the wrong bore size will starve or flood the coil. Because metering is so size-sensitive, the OEM-spec piston is the safe choice.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Advanced (EPA 608 certification required).\u003c\/strong\u003e The piston seats inside the liquid-line connection at the coil; replacement requires refrigerant recovery, evacuation, and recharge. Have a licensed HVAC technician perform the swap.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057205199219,"sku":"GOODMAN-891","price":10.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-wghp4324aab-b1789857-1","provider":"National HVAC Parts","version":"1.0","type":"link"}