{"product_id":"oem-goodman-piston-kit-for-asz130181ag-heat-pump-b1789851","title":"OEM Goodman Piston Kit for ASZ130181AG Heat Pump — B1789851","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789851 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device (flow restrictor \/ fixed orifice) for the \u003cstrong\u003eASZ130181AG\u003c\/strong\u003e heat pump. The piston meters refrigerant flow into the coil, controlling the pressure drop that allows the refrigerant to evaporate and absorb heat. Each piston is bored to a precise orifice diameter matched to the system tonnage; using the wrong size causes flooding, starving, poor capacity, and inefficient operation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Type: Piston \/ Fixed-Orifice Metering Device\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: B1789851\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman\u003c\/li\u003e\n\u003cli\u003eCompatible Equipment: ASZ130181AG heat pump\u003c\/li\u003e\n\u003cli\u003eEquipment Type: Heat Pump (13 SEER two-stage)\u003c\/li\u003e\n\u003cli\u003eFunction: Refrigerant flow metering (precision-bored orifice)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eBecause piston sizing is measured in thousandths of an inch, using the \u003cstrong\u003eOEM Goodman piston\u003c\/strong\u003e guarantees the exact orifice diameter engineered for the ASZ13 coil and charge. Generic or mis-sized pistons are the leading cause of poor superheat\/subcooling and comfort complaints. This is one component where OEM matching is essential.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate to Difficult — Professional Recommended.\u003c\/strong\u003e Access requires recovering refrigerant, opening the metering device housing, swapping the piston and seal, then evacuating and recharging the system. Requires EPA Section 608 certification.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058304369011,"sku":"GOODMAN-16142","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-asz130181ag-heat-pump-b1789851","provider":"National HVAC Parts","version":"1.0","type":"link"}