{"product_id":"oem-goodman-piston-flowrator-kit-for-anz130181ac-b1789851","title":"OEM Goodman Piston \/ Flowrator Kit for ANZ130181AC — B1789851","description":"\u003ch2\u003eGoodman B1789851 Metering Piston (Flowrator) Kit\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eB1789851\u003c\/strong\u003e is the OEM metering piston, or flowrator, for the Goodman \u003cstrong\u003eANZ130181AC\u003c\/strong\u003e heat pump. This precision-drilled orifice sits inside the refrigerant line at the coil and controls how much liquid refrigerant feeds into the evaporator, setting the system's superheat and capacity. A worn, wrong-size, or debris-clogged piston shows up as poor cooling\/heating, iced coils, or high head pressure. Because it is inexpensive and wear-prone, it is a common item to replace during a coil or compressor changeout.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789851\u003c\/li\u003e\n\u003cli\u003eComponent: Fixed-orifice metering piston (flowrator)\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ANZ130181AC heat pump\u003c\/li\u003e\n\u003cli\u003eBore: Factory-calibrated orifice for this model's tonnage\u003c\/li\u003e\n\u003cli\u003eBody: Machined brass with sealing O-ring\u003c\/li\u003e\n\u003cli\u003eFunction: Meters refrigerant into the coil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\n\u003cp\u003eOrifice size is everything with a piston. The OEM B1789851 is drilled to the exact bore the ANZ130181AC needs, so superheat and capacity land where the engineers intended. A generic piston with the wrong bore will starve or flood the coil and kill efficiency. For a few dollars, always match OEM.\u003c\/p\u003e\n\u003ch3\u003eInstallation Difficulty: Professional\u003c\/h3\u003e\n\u003cp\u003eReplacing the piston opens the sealed refrigerant circuit. An EPA-608 certified technician should recover refrigerant, open the fitting, swap the piston and O-ring, then evacuate and recharge. Not a DIY repair. Estimated time: 45-90 minutes for a tech.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058265178483,"sku":"GOODMAN-15138","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-flowrator-kit-for-anz130181ac-b1789851","provider":"National HVAC Parts","version":"1.0","type":"link"}