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Goodman

OEM Goodman Piston / Flow Kit for ASZ130241AH Heat Pump — B1789857

SKU: GOODMAN-16182 Brand: Goodman
$5.95 $7.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The Goodman B1789857 Piston Kit is a genuine OEM refrigerant metering piston (flowrator) for the ASZ130241AH 13 SEER, 2‑ton (24,000 BTU) R‑410A heat pump. The piston seats in the liquid-line fitting and provides the precise orifice restriction that meters refrigerant into the indoor or outdoor coil, setting the correct superheat and subcooling for rated capacity and efficiency.

  • Type: Fixed-orifice metering piston / flowrator
  • Fits: Goodman ASZ130241AH and matched ASZ13-series systems
  • Refrigerant: R‑410A
  • Function: Meters refrigerant flow to the coil for proper superheat/subcooling
  • Orifice: Factory-drilled to the AHRI-matched tonnage for this model

OEM vs. Generic: Piston orifice diameter is measured in thousandths of an inch and is matched to the exact indoor/outdoor coil pairing. A generic piston of the wrong bore starves or floods the coil, killing capacity and risking compressor damage. OEM ensures the drilled size matches Goodman's AHRI-certified combination.

Install difficulty: Advanced (4/5). Requires recovering refrigerant, opening the liquid-line flare/fitting, swapping the piston and O-ring, then evacuating and recharging. EPA-certified technician recommended.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Piston fit my Goodman ASZ130241AH Heat Pump — B1789857?
Yes. This is the factory-specified OEM piston for the Goodman ASZ130241AH Heat Pump — B1789857. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the piston on my Goodman ASZ130241AH Heat Pump — B1789857?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new piston?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this piston compatible with Bryant or Payne too?
Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Goodman piston?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
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