{"product_id":"oem-goodman-refrigerant-piston-orifice-kit-for-asz130241ac-b1789857","title":"OEM Goodman Refrigerant Piston \/ Orifice Kit for ASZ130241AC — B1789857","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789857 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering piston (orifice) for the \u003cstrong\u003eASZ130241AC\u003c\/strong\u003e 13 SEER, 2-ton heat pump and compatible Goodman\/Amana systems. The piston sits inside the liquid-line flowrator and meters refrigerant into the coil, maintaining the correct pressure drop and superheat for efficient heating and cooling. The bore size is matched to the system's tonnage, so using the right piston is essential to proper charge and capacity.\u003c\/p\u003e\u003cp\u003eReplace the piston when it is scored, plugged with debris after a compressor failure, or when the factory piston is missing or the wrong size following a coil swap. It is an inexpensive part that has an outsized effect on system performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789857\u003c\/li\u003e\n\u003cli\u003eType: Refrigerant metering piston \/ orifice\u003c\/li\u003e\n\u003cli\u003eFunction: Fixed-orifice liquid refrigerant metering\u003c\/li\u003e\n\u003cli\u003eLocation: Liquid-line flowrator housing\u003c\/li\u003e\n\u003cli\u003eEquipment: Heat Pump \/ condenser coil\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ASZ130241AC and compatible models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe genuine OEM B1789857 is bored to Goodman's exact orifice diameter for this tonnage, so superheat and subcooling land where they should. Generic pistons are often close but not exact, causing overfeeding or starving of the coil, poor efficiency, and possible compressor flooding. At this price, matching OEM is a no-brainer.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eProfessional — EPA certification required.\u003c\/strong\u003e Accessing the piston means opening the sealed system: recover refrigerant, disassemble the flowrator, swap the piston with a new O-ring\/Teflon seal, evacuate, and recharge. Leave to a licensed HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058304794995,"sku":"GOODMAN-16158","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-refrigerant-piston-orifice-kit-for-asz130241ac-b1789857","provider":"National HVAC Parts","version":"1.0","type":"link"}