What are the specs for this Piston Kit?

The correct replacement for Goodman model ASZ130241AA — 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 ASZ130241AA — B1789857.

What symptoms indicate I need a new piston kit?

Common symptoms that indicate you need a new piston kit 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 kit 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 / Flowrator Kit for ASZ130241AA — B1789857

Name: OEM Goodman Piston / Flowrator Kit for ASZ130241AA — B1789857
Brand: Goodman
SKU: GOODMAN-16147
Price: 9.95 USD
Availability: InStock

SKU: GOODMAN-16147 Brand: Goodman

$9.95 $12.95

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Goodman B1789857 Piston Kit

The B1789857 is a genuine OEM metering piston (flowrator) kit for Goodman ASZ130241AA 13 SEER, 2-ton heat pumps. The fixed-orifice piston meters liquid refrigerant into the evaporator or condenser coil, setting the pressure drop that governs proper superheat and capacity. Using the factory-specified orifice size is essential for correct system performance and efficiency.

Specifications

OEM Part Number: B1789857
Brand: Goodman (Amana-compatible)
Equipment: ASZ130241AA condensing heat pump
Type: Fixed-orifice metering piston (flowrator) with retainer
Kit includes: Piston, O-ring/seal, and retainer as supplied by Goodman

OEM vs. Generic

The orifice diameter on a metering piston is matched to tonnage and coil design down to the thousandth of an inch. An OEM B1789857 guarantees the exact bore Goodman engineered for the ASZ13 system. Generic pistons in the wrong size cause flooding, starving, poor superheat, and reduced efficiency.

Installation Difficulty

Rating: Professional. Access requires opening the sealed refrigerant circuit at the piston housing, so recovery, evacuation, and recharge by an EPA-certified technician are needed. Once the housing is open, the piston swap itself is quick, but the sealed-system work must be done by a pro.

Compatibility note: Confirm your model and coil match before ordering.

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 / Flowrator K...

$9.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ASZ130241AA — B1789857?

Yes. This is the factory-specified OEM piston kit for the Goodman ASZ130241AA — 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 kit on my Goodman ASZ130241AA — 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 kit?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this piston kit 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 kit?

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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