What are the specs for this Piston Kit?

The correct replacement for Goodman model ASH130481AB — B1789884 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 ASH130481AB — B1789884.

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 ASH130481AB — B1789884

Name: OEM Goodman Piston / Flowrator Kit for ASH130481AB — B1789884
Brand: Goodman
SKU: GOODMAN-16076
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16076 Brand: Goodman

$5.95 $7.95

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Goodman B1789884 Refrigerant Piston (Flowrator) Kit

The Goodman B1789884 is a genuine OEM refrigerant metering piston, sometimes called a flowrator, sized for the ASH130481AB 4-ton, 13 SEER heat pump. The piston is a precision-drilled orifice that regulates the flow of liquid refrigerant into the evaporator or condenser coil depending on heating or cooling mode. Correct bore sizing is essential to maintain proper superheat, capacity, and efficiency.

Specifications

OEM Part Number: B1789884
Fits: Goodman ASH130481AB heat pump systems
Type: Fixed-orifice metering piston (flowrator)
Refrigerant: R-410A
Equipment: 4-ton (48,000 BTU) 13 SEER heat pump
Includes: Piston and retainer as applicable

OEM vs. Generic

The bore diameter on a metering piston is matched to the exact tonnage and coil design of the ASH13 platform. Installing a generic piston with the wrong bore causes flooding or starvation of the coil, poor superheat/subcooling, and reduced capacity. The OEM B1789884 guarantees the factory-specified orifice size for reliable performance.

Installation Difficulty

Difficulty: Hard (EPA 608 certification required). The system must be recovered or pumped down to access the piston housing at the metering device or coil connection. After swapping the piston, the joint is reassembled, evacuated, and recharged. Professional service recommended. Estimated labor: 1–1.5 hours.

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...

$5.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ASH130481AB — B1789884?

Yes. This is the factory-specified OEM piston kit for the Goodman ASH130481AB — B1789884. 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 ASH130481AB — B1789884?

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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