{"product_id":"oem-goodman-metering-piston-flowrator-kit-for-ash130181ac-heat-pump-b1789852","title":"OEM Goodman Metering Piston Flowrator Kit for ASH130181AC Heat Pump — B1789852","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789852 Piston (Flowrator) Kit\u003c\/strong\u003e is the factory metering device for the \u003cstrong\u003eASH130181AC\u003c\/strong\u003e heat pump. This fixed-orifice piston sets the refrigerant flow rate into the coil, controlling superheat and system capacity. The correct orifice size is critical — an over- or under-sized piston causes poor cooling, high head pressure, or compressor flooding.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: B1789852\u003c\/li\u003e\n\u003cli\u003eComponent: Metering piston \/ flowrator orifice kit\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana ASH130181AC heat pump\u003c\/li\u003e\n\u003cli\u003eType: Fixed-bore refrigerant metering piston\u003c\/li\u003e\n\u003cli\u003eBore: Factory-drilled to the ASH130181AC capacity\u003c\/li\u003e\n\u003cli\u003eIncludes: Piston and seating components\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eGenuine Goodman pistons are precision-drilled and stamped with the exact orifice number your unit was engineered around. A generic piston with the wrong bore — even by a few thousandths — throws off superheat and subcooling, degrading efficiency and risking liquid return to the compressor. The OEM piston guarantees the charge behaves as designed.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty: Hard (4\/5) — HVAC Pro Recommended\u003c\/h3\u003e\u003cp\u003eThe piston sits inside the sealed refrigerant circuit. Recover the charge, open the liquid-line flare or the coil distributor to swap the piston, then re-seal, pull a deep vacuum, and recharge by weight while checking superheat. EPA Section 608 certification is required. We recommend a licensed HVAC technician.\u003c\/p\u003e\u003cp\u003eExact-fit for the ASH130181AC and backed by our fit guarantee.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057152901491,"sku":"GOODMAN-B1789852","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-metering-piston-flowrator-kit-for-ash130181ac-heat-pump-b1789852","provider":"National HVAC Parts","version":"1.0","type":"link"}