{"product_id":"oem-goodman-piston-metering-device-kit-for-asz130241ad-b1789857","title":"OEM Goodman Piston \/ Metering Device Kit for ASZ130241AD — B1789857","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789857 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device (flow restrictor) matched to the \u003cstrong\u003eASZ130241AD\u003c\/strong\u003e 2-ton 13 SEER heat pump. The piston seats inside the liquid-line fitting and meters refrigerant into the coil through a precisely sized orifice, setting the correct pressure drop for proper superheat and subcooling. An incorrectly sized or worn piston causes poor capacity, high head pressure, or coil flooding — so exact orifice sizing matters.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e B1789857\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent:\u003c\/strong\u003e Piston \/ fixed-orifice metering device\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman ASZ130241AD heat pump (matched orifice for 2-ton capacity)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Meters refrigerant flow for correct system pressures\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Direct OEM exact-fit replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM vs. Generic:\u003c\/strong\u003e Goodman calibrates this piston's orifice diameter to the ASZ13 system's tonnage and refrigerant charge. Installing a generic piston with the wrong bore throws off superheat and subcooling, hurting efficiency and risking compressor damage. OEM guarantees the factory-specified flow rate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstall difficulty:\u003c\/strong\u003e Hard (4\/5) — Professional recommended. The system must be recovered and evacuated to open the liquid-line connection, the piston swapped, and the system re-vacuumed and recharged. This requires EPA 608 certification and gauges to verify pressures. Not a DIY job for anyone without refrigerant-handling equipment.\u003c\/p\u003e\u003cp\u003eVerify your model and serial number before ordering. Genuine Goodman quality for accurate refrigerant metering.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058304926067,"sku":"GOODMAN-16164","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-metering-device-kit-for-asz130241ad-b1789857","provider":"National HVAC Parts","version":"1.0","type":"link"}