What are the specs for this Piston Kit?

The correct replacement for Goodman model ANZ130481AC — 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 ANZ130481AC — 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 Piston / Restrictor Kit for ANZ130481AC — B1789878

Name: OEM Goodman Piston / Restrictor Kit for ANZ130481AC — B1789878
Brand: Goodman
SKU: GOODMAN-15199
Price: 7.95 USD
Availability: InStock

SKU: GOODMAN-15199 Brand: Goodman

$7.95 $10.95

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The Goodman B1789878 is a genuine OEM piston (flow restrictor / metering device) kit for the ANZ130481AC heat pump. The piston meters refrigerant flow into the evaporator or condenser coil, maintaining the correct pressure drop and superheat for efficient heat transfer. A worn, clogged, or incorrectly sized piston causes poor cooling and heating performance, coil frosting, and higher energy bills — so using the factory-specified orifice size matters.

Specifications

OEM Part Number: B1789878
Component Type: Piston / Fixed Orifice Metering Device
Function: Meters refrigerant flow at the coil
Equipment: Heat Pump Condensing Unit
Fits Model: ANZ130481AC
Brand: Goodman (Amana ANZ series)
Includes: Precision-drilled piston insert

OEM vs. Generic

Piston bore diameter is matched to the ANZ130481AC's tonnage and refrigerant charge. This OEM kit carries the exact factory orifice size, guaranteeing correct refrigerant metering. Generic pistons are sold in assorted bores and, if mismatched, will throw off superheat/subcooling and rob the system of capacity. For a metering device, correct sizing is everything — OEM removes the guesswork.

Installation Difficulty

Rating: Hard (Professional Required). The piston sits inside the liquid-line flare connection at the coil, so replacement requires refrigerant recovery, opening the sealed system, swapping the insert, then evacuating and recharging. An EPA-certified technician should perform this work to protect the charge and warranty.

Compatible with the Goodman/Amana ANZ130481AC heat pump. Verify your model and serial 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 / Restrictor ...

$7.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ANZ130481AC — B1789878?

Yes. This is the factory-specified OEM piston kit for the Goodman ANZ130481AC — 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 ANZ130481AC — 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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