{"product_id":"oem-goodman-refrigerant-piston-flowrator-kit-for-ash130421ab-b1789882","title":"OEM Goodman Refrigerant Piston \/ Flowrator Kit for ASH130421AB — B1789882","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789882 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device (flowrator) for the \u003cstrong\u003eASH130421AB\u003c\/strong\u003e heat pump. The piston's fixed-bore orifice sets the refrigerant flow rate into the coil, establishing correct superheat and system capacity. Using the exact factory-specified orifice size is essential — an incorrectly sized piston causes poor cooling\/heating, high head pressure, or compressor flooding.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789882\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice refrigerant piston (flowrator)\u003c\/li\u003e\n\u003cli\u003eFunction: Meters refrigerant into the indoor\/outdoor coil\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana ASH130421AB heat pump\u003c\/li\u003e\n\u003cli\u003eEquipment Type: Heat Pump\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (Genuine OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eGenuine OEM Goodman piston\u003c\/strong\u003e is bored to the precise diameter Goodman engineered for this system's tonnage and refrigerant charge. Generic assortment-kit pistons may be close but not exact, throwing off superheat and efficiency. At this price point, there is no reason to gamble on an off-spec orifice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (4\/5) — professional recommended.\u003c\/strong\u003e The piston seats inside the liquid-line flare fitting at the coil. Access requires recovering refrigerant, opening the fitting, swapping the piston with a new O-ring\/seal, then evacuating and recharging. Best handled by a certified technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058302370163,"sku":"GOODMAN-16052","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-refrigerant-piston-flowrator-kit-for-ash130421ab-b1789882","provider":"National HVAC Parts","version":"1.0","type":"link"}