{"product_id":"oem-goodman-piston-kit-for-ash130181a-heat-pump-b1789852","title":"OEM Goodman Piston Kit for ASH130181A Heat Pump — B1789852","description":"\u003ch2\u003eGoodman B1789852 Piston Kit\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1789852\u003c\/strong\u003e piston kit is the OEM refrigerant metering device engineered for the \u003cstrong\u003eASH130181A\u003c\/strong\u003e 13 SEER heat pump and compatible Goodman\/Amana condensing units. This flowrator-style fixed orifice controls the flow of R-410A refrigerant into the outdoor coil, ensuring the correct pressure drop and superheat for efficient heating and cooling. Using the factory-specified piston size is critical — an incorrectly bored orifice causes poor capacity, high head pressure, or compressor stress.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1789852\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Fixed-orifice piston \/ flowrator metering device\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefrigerant:\u003c\/strong\u003e R-410A compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman ASH130181A and matched heat pump systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Machined brass with factory-bored orifice\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eGeneric pistons ship as universal orifice sets that require you to match the bore number by hand. The genuine OEM B1789852 arrives pre-sized to Goodman's engineering spec, eliminating guesswork and protecting your compressor warranty. For a metering device, exact bore diameter is non-negotiable.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eRating: Moderate (EPA certification required).\u003c\/strong\u003e Replacing a piston requires recovering the system refrigerant, opening the sealed circuit, swapping the orifice inside the liquid-line fitting, then evacuating and recharging. This is a job for an EPA Section 608 certified technician. Verify subcooling and superheat against the Goodman spec sheet before returning the unit to service.\u003c\/p\u003e\u003cp\u003eEvery piston kit we ship is a genuine Goodman OEM component backed by our fit guarantee.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058299879795,"sku":"GOODMAN-15920","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-ash130181a-heat-pump-b1789852","provider":"National HVAC Parts","version":"1.0","type":"link"}