What are the specs for this Piston Kit?

The correct replacement for Goodman model ASH130481AC Heat Pump — 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 ASH130481AC Heat Pump — 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 Metering Piston Kit for ASH130481AC Heat Pump — B1789884

Name: OEM Goodman Metering Piston Kit for ASH130481AC Heat Pump — B1789884
Brand: Goodman
SKU: GOODMAN-B1789884
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-B1789884 Brand: Goodman

$5.95 $7.95

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Goodman B1789884 Metering Piston Kit

The B1789884 is a genuine Goodman OEM metering piston (flow-restrictor / orifice) kit sized for the ASH130481AC 13 SEER, 4-ton heat pump. The piston seats inside the refrigerant distributor and controls the pressure drop and flow rate into the coil, establishing the correct superheat and subcooling. A worn, wrong-bore, or debris-clogged piston causes poor capacity, iced coils, high head pressure, and comfort complaints — installing the factory-specified piston restores rated performance.

Specifications

OEM Part Number: B1789884
Fits: Goodman ASH130481AC heat pump
Type: Metering piston / fixed orifice restrictor kit
Bore: Factory-calibrated for ASH130481AC tonnage
Includes: Piston and seal/O-ring as applicable
Equipment: Heat Pump (indoor/outdoor metering device)

OEM vs. Generic

The genuine Goodman piston is bored to the exact diameter the ASH130481AC was engineered for, delivering the correct refrigerant flow. A generic or mismatched-bore piston throws off superheat and can permanently hurt efficiency and coil life. With OEM you get the precise restriction the system was designed around.

Installation Difficulty: Professional

Rated Professional (4/5). Requires recovering refrigerant (or isolating the metering device), opening the distributor body, swapping the piston, reassembling with a fresh seal, and recharging to spec. Best performed by a licensed HVAC technician verifying superheat/subcooling after the change.

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 Metering Piston Kit ...

$5.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ASH130481AC Heat Pump — B1789884?

Yes. This is the factory-specified OEM piston kit for the Goodman ASH130481AC Heat Pump — 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 ASH130481AC Heat Pump — 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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