What are the specs for this Piston Kit?

The correct replacement for Goodman model ANZ130481AA — B1789878 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 ANZ130481AA — B1789878.

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 Kit for ANZ130481AA — B1789878

Name: OEM Goodman Refrigerant Piston Kit for ANZ130481AA — B1789878
Brand: Goodman
SKU: GOODMAN-15189
Price: 7.95 USD
Availability: InStock

SKU: GOODMAN-15189 Brand: Goodman

$7.95 $10.95

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Texas CMBL #19328542014

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The Goodman B1789878 Refrigerant Piston Kit is the genuine OEM metering device (flowrator) that controls refrigerant flow into the coil on the ANZ130481AA heat pump. This precision-drilled piston sets the exact orifice size the system needs to maintain proper superheat and subcooling, ensuring rated capacity and efficiency. Using the wrong piston size — or a worn, debris-clogged one — causes poor cooling, iced coils, high head pressure, and compressor stress.

Specifications

OEM Part Number: B1789878
Type: Fixed-orifice refrigerant piston (flowrator) kit
Function: Meters liquid refrigerant into the coil
Precision-machined orifice matched to system tonnage
Fits: Goodman/Amana ANZ130481AA and compatible heat pumps
Kit includes piston and retainer/seal components as supplied by the factory

OEM vs. Generic

The genuine OEM Goodman piston is bored to the precise diameter this coil and compressor were rated for. Even a few thousandths of an inch off — common with generic pistons — throws off the charge and can slash efficiency or damage the compressor. At this price point, there is no reason to gamble on a non-OEM orifice.

Installation Difficulty

Advanced (4/5). Swapping the piston requires refrigerant recovery, opening the liquid-line/coil connection, seating the new piston with the correct orientation, then evacuating and recharging — a job for an EPA-certified technician. Professional installation recommended.

Genuine Goodman metering accuracy. Share your model and serial and we'll confirm the correct piston size.

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 K...

$7.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ANZ130481AA — B1789878?

Yes. This is the factory-specified OEM piston kit for the Goodman ANZ130481AA — B1789878. 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 ANZ130481AA — B1789878?

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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