What are the specs for this Piston?

The correct replacement for Goodman model ASZ130241AD — B1789857 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number ASZ130241AD — B1789857.

What symptoms indicate I need a new piston?

Common symptoms that indicate you need a new piston include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this piston compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman Piston / Metering Device Kit for ASZ130241AD — B1789857

Name: OEM Goodman Piston / Metering Device Kit for ASZ130241AD — B1789857
Brand: Goodman
SKU: GOODMAN-16164
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16164 Brand: Goodman

$5.95 $7.95

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The Goodman B1789857 Piston Kit is a genuine OEM refrigerant metering device (flow restrictor) matched to the ASZ130241AD 2-ton 13 SEER heat pump. The piston seats inside the liquid-line fitting and meters refrigerant into the coil through a precisely sized orifice, setting the correct pressure drop for proper superheat and subcooling. An incorrectly sized or worn piston causes poor capacity, high head pressure, or coil flooding — so exact orifice sizing matters.

Part number: B1789857
Component: Piston / fixed-orifice metering device
Fits: Goodman ASZ130241AD heat pump (matched orifice for 2-ton capacity)
Function: Meters refrigerant flow for correct system pressures
Type: Direct OEM exact-fit replacement

OEM vs. Generic: Goodman calibrates this piston's orifice diameter to the ASZ13 system's tonnage and refrigerant charge. Installing a generic piston with the wrong bore throws off superheat and subcooling, hurting efficiency and risking compressor damage. OEM guarantees the factory-specified flow rate.

Install difficulty: Hard (4/5) — Professional recommended. The system must be recovered and evacuated to open the liquid-line connection, the piston swapped, and the system re-vacuumed and recharged. This requires EPA 608 certification and gauges to verify pressures. Not a DIY job for anyone without refrigerant-handling equipment.

Verify your model and serial number before ordering. Genuine Goodman quality for accurate refrigerant metering.

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

OEM Goodman Piston / Metering De...

$5.95

Frequently Asked Questions

Does this Piston fit my Goodman ASZ130241AD — B1789857?

Yes. This is the factory-specified OEM piston for the Goodman ASZ130241AD — 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 ASZ130241AD — 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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OEM Goodman Piston / Metering Device Kit for ASZ130241AD — B1789857

Shipping Information

Return Policy

Frequently Asked Questions