What are the specs for this Piston Kit?

The correct replacement for Goodman model ASH130421AB — B1789882 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 ASH130421AB — B1789882.

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 / Flowrator Kit for ASH130421AB — B1789882

Name: OEM Goodman Refrigerant Piston / Flowrator Kit for ASH130421AB — B1789882
Brand: Goodman
SKU: GOODMAN-16052
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16052 Brand: Goodman

$5.95 $7.95

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Texas CMBL #19328542014

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The Goodman B1789882 Piston Kit is a genuine OEM refrigerant metering device (flowrator) for the ASH130421AB heat pump. The piston's fixed-bore orifice sets the refrigerant flow rate into the coil, establishing correct superheat and system capacity. Using the exact factory-specified orifice size is essential — an incorrectly sized piston causes poor cooling/heating, high head pressure, or compressor flooding.

Specifications

OEM Part Number: B1789882
Type: Fixed-orifice refrigerant piston (flowrator)
Function: Meters refrigerant into the indoor/outdoor coil
Fits: Goodman/Amana ASH130421AB heat pump
Equipment Type: Heat Pump
Brand: Goodman (Genuine OEM)

OEM vs. Generic

The Genuine OEM Goodman piston is bored to the precise diameter Goodman engineered for this system's tonnage and refrigerant charge. Generic assortment-kit pistons may be close but not exact, throwing off superheat and efficiency. At this price point, there is no reason to gamble on an off-spec orifice.

Installation Difficulty

Advanced (4/5) — professional recommended. The piston seats inside the liquid-line flare fitting at the coil. Access requires recovering refrigerant, opening the fitting, swapping the piston with a new O-ring/seal, then evacuating and recharging. Best handled by a certified 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 ASH130421AB — B1789882?

Yes. This is the factory-specified OEM piston kit for the Goodman ASH130421AB — B1789882. 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 ASH130421AB — B1789882?

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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