{"product_id":"oem-goodman-piston-flowrator-kit-for-asz130241af-heat-pump-b1789857","title":"OEM Goodman Piston (Flowrator) Kit for ASZ130241AF Heat Pump — B1789857","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789857 Piston Kit\u003c\/strong\u003e is the genuine OEM flowrator (fixed-orifice metering device) for the \u003cstrong\u003eASZ130241AF\u003c\/strong\u003e heat pump. This precision-drilled piston controls the rate of liquid refrigerant entering the coil, setting the pressure drop that lets the refrigerant boil off and absorb heat. The correct orifice diameter is what delivers rated capacity and efficiency — an incorrect size will starve or flood the coil and hurt both heating and cooling performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789857\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice piston \/ flowrator metering device\u003c\/li\u003e\n\u003cli\u003eFits Model: ASZ130241AF (Goodman heat pump)\u003c\/li\u003e\n\u003cli\u003eFunction: Meters liquid refrigerant flow into the coil\u003c\/li\u003e\n\u003cli\u003eInstallation: Seats inside the liquid-line distributor \/ metering body\u003c\/li\u003e\n\u003cli\u003eApplication: Split-system heat pump — matched orifice sizing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston sizing is model-specific and stamped to a precise bore. The \u003cstrong\u003eOEM B1789857\u003c\/strong\u003e is the exact orifice Goodman specifies for the ASZ130241AF, guaranteeing rated subcooling and superheat. A generic or wrongly-sized piston is one of the most common causes of poor capacity and high energy bills after a repair. For correct system performance, always use the OEM piston.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eProfessional \/ Difficult (4\/5).\u003c\/strong\u003e Replacing the piston opens the sealed refrigerant circuit. It requires refrigerant recovery, disassembly of the metering fitting, correct piston orientation, then evacuation and recharge. This job should be completed by an EPA 608-certified HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058305483123,"sku":"GOODMAN-16174","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-flowrator-kit-for-asz130241af-heat-pump-b1789857","provider":"National HVAC Parts","version":"1.0","type":"link"}