{"product_id":"oem-goodman-piston-flowrator-kit-for-ash130481ab-b1789884","title":"OEM Goodman Piston \/ Flowrator Kit for ASH130481AB — B1789884","description":"\u003ch2\u003eGoodman B1789884 Refrigerant Piston (Flowrator) Kit\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1789884\u003c\/strong\u003e is a genuine OEM refrigerant metering piston, sometimes called a flowrator, sized for the \u003cstrong\u003eASH130481AB\u003c\/strong\u003e 4-ton, 13 SEER heat pump. The piston is a precision-drilled orifice that regulates the flow of liquid refrigerant into the evaporator or condenser coil depending on heating or cooling mode. Correct bore sizing is essential to maintain proper superheat, capacity, and efficiency.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789884\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ASH130481AB heat pump systems\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice metering piston (flowrator)\u003c\/li\u003e\n\u003cli\u003eRefrigerant: R-410A\u003c\/li\u003e\n\u003cli\u003eEquipment: 4-ton (48,000 BTU) 13 SEER heat pump\u003c\/li\u003e\n\u003cli\u003eIncludes: Piston and retainer as applicable\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe bore diameter on a metering piston is matched to the exact tonnage and coil design of the ASH13 platform. Installing a generic piston with the wrong bore causes flooding or starvation of the coil, poor superheat\/subcooling, and reduced capacity. The OEM B1789884 guarantees the factory-specified orifice size for reliable performance.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Hard (EPA 608 certification required).\u003c\/strong\u003e The system must be recovered or pumped down to access the piston housing at the metering device or coil connection. After swapping the piston, the joint is reassembled, evacuated, and recharged. Professional service recommended. Estimated labor: 1–1.5 hours.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058302927219,"sku":"GOODMAN-16076","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-flowrator-kit-for-ash130481ab-b1789884","provider":"National HVAC Parts","version":"1.0","type":"link"}