{"product_id":"oem-goodman-piston-kit-for-wghp4324aaa-b1789857-1","title":"OEM Goodman Piston Kit for WGHP4324AAA — B1789857","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789857 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device for the \u003cstrong\u003eWGHP4324AAA\u003c\/strong\u003e packaged heat pump. The piston (also called a flowrator or orifice) controls the precise flow of refrigerant into the evaporator coil, maintaining proper superheat and rated cooling\/heating capacity.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1789857\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Model:\u003c\/strong\u003e WGHP4324AAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Fixed-orifice piston \/ flowrator kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Refrigerant metering to evaporator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Machined brass orifice with retainer\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston bore size is matched to the tonnage and refrigerant of the WGHP4324AAA. Installing a \u003cstrong\u003egenuine Goodman OEM piston\u003c\/strong\u003e ensures the exact orifice diameter the system was engineered for. A generic piston with the wrong bore will flood or starve the coil, hurting efficiency and risking compressor damage.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHard \/ Professional.\u003c\/strong\u003e Requires refrigerant recovery, opening the liquid line, seating the new piston in its housing, evacuation, and recharge. EPA certification recommended; best left to an HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057205100915,"sku":"GOODMAN-887","price":10.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-wghp4324aaa-b1789857-1","provider":"National HVAC Parts","version":"1.0","type":"link"}