{"product_id":"oem-goodman-piston-kit-for-ash130181aa-heat-pump-b1789852","title":"OEM Goodman Piston Kit for ASH130181AA Heat Pump — B1789852","description":"\u003ch2\u003eGoodman B1789852 Piston Kit\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1789852\u003c\/strong\u003e piston (flowrator) kit is the genuine OEM refrigerant metering device for the \u003cstrong\u003eASH130181AA\u003c\/strong\u003e heat pump. The piston sits inside the liquid-line flowrator body and meters refrigerant into the coil at a fixed, calibrated bore size. Using the correct piston is essential to achieving proper subcooling and superheat — the wrong bore causes flooding, starving, and poor capacity.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789852\u003c\/li\u003e\n\u003cli\u003eFits Model: ASH130181AA (Heat Pump)\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice metering piston \/ flowrator kit\u003c\/li\u003e\n\u003cli\u003eIncludes: Piston and Teflon seal (verify kit contents against your flowrator body)\u003c\/li\u003e\n\u003cli\u003eFunction: Liquid-line refrigerant metering\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (Amana compatible)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston bore sizing is matched to the exact coil tonnage and refrigerant type. An incorrectly sized generic piston will throw off charge and can cause coil freezing or high head pressure. The OEM B1789852 guarantees the factory-specified bore for this model, so the system charges and performs to spec.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eRating: Professional \/ Advanced.\u003c\/strong\u003e Swapping the piston requires opening the flowrator union on the sealed refrigerant circuit — recover refrigerant first, replace the piston and seal, then evacuate and recharge to nameplate. EPA 608 certification is required. Not a DIY repair.\u003c\/p\u003e\u003cp\u003eGenuine OEM metering accuracy with fast shipping from National HVAC Parts.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058300010867,"sku":"GOODMAN-15928","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-ash130181aa-heat-pump-b1789852","provider":"National HVAC Parts","version":"1.0","type":"link"}