{"product_id":"oem-goodman-piston-flowrator-kit-for-asz130241ba-b1789857","title":"OEM Goodman Piston \/ Flowrator Kit for ASZ130241BA — B1789857","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789857 Piston Kit\u003c\/strong\u003e (flowrator\/orifice) is a genuine OEM refrigerant metering device for the \u003cstrong\u003eASZ130241BA\u003c\/strong\u003e heat pump and matched Goodman\/Amana indoor coils. The piston is a precision-drilled orifice that meters liquid refrigerant into the evaporator or condenser coil, setting the superheat and subcooling the system was designed around. Correct piston size is essential for rated capacity and efficiency.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1789857 (OEM Goodman)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Piston \/ flowrator metering orifice\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment:\u003c\/strong\u003e Heat Pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Fit:\u003c\/strong\u003e ASZ130241BA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Refrigerant metering (fixed orifice)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Piston and seal\/o-ring as supplied\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston orifice diameter is model-specific — even a few thousandths of an inch off changes superheat and can starve or flood the coil. The genuine B1789857 is drilled to Goodman's factory spec for the ASZ130241BA, guaranteeing rated performance. Aftermarket piston sets require you to select and verify the orifice size yourself, adding risk of a mismatched charge.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIntermediate to Advanced.\u003c\/strong\u003e The piston lives inside the liquid-line flare connection at the coil or distributor. Replacement requires recovering refrigerant, opening the flare joint, swapping the piston with a fresh seal, and re-evacuating\/recharging. EPA-certified refrigerant handling required.\u003c\/p\u003e\u003cp\u003eA low-cost genuine part that protects the far more expensive compressor and coil.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058305778035,"sku":"GOODMAN-16186","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-flowrator-kit-for-asz130241ba-b1789857","provider":"National HVAC Parts","version":"1.0","type":"link"}