What are the specs for this Piston Kit?

The correct replacement for Goodman model ASZ130241AC — 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 ASZ130241AC — 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 Refrigerant Piston / Orifice Kit for ASZ130241AC — B1789857

Name: OEM Goodman Refrigerant Piston / Orifice Kit for ASZ130241AC — B1789857
Brand: Goodman
SKU: GOODMAN-16158
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16158 Brand: Goodman

$5.95 $7.95

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The Goodman B1789857 Piston Kit is a genuine OEM refrigerant metering piston (orifice) for the ASZ130241AC 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.

Replace 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.

Specifications

OEM Part Number: B1789857
Type: Refrigerant metering piston / orifice
Function: Fixed-orifice liquid refrigerant metering
Location: Liquid-line flowrator housing
Equipment: Heat Pump / condenser coil
Fits: Goodman ASZ130241AC and compatible models

OEM vs. Generic

The 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.

Installation Difficulty

Professional — EPA certification required. 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.

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 Refrigerant Piston /...

$5.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ASZ130241AC — B1789857?

Yes. This is the factory-specified OEM piston kit for the Goodman ASZ130241AC — 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 ASZ130241AC — 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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