What are the specs for this Piston / Flowrator Kit?

The correct replacement for Goodman model ASH130181AC Heat Pump — B1789852 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 ASH130181AC Heat Pump — B1789852.

What symptoms indicate I need a new piston / flowrator kit?

Common symptoms that indicate you need a new piston / flowrator kit include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

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Goodman

OEM Goodman Metering Piston Flowrator Kit for ASH130181AC Heat Pump — B1789852

Name: OEM Goodman Metering Piston Flowrator Kit for ASH130181AC Heat Pump — B1789852
Brand: Goodman
SKU: GOODMAN-B1789852
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-B1789852 Brand: Goodman

$5.95 $7.95

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Texas CMBL #19328542014

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The Goodman B1789852 Piston (Flowrator) Kit is the factory metering device for the ASH130181AC heat pump. This fixed-orifice piston sets the refrigerant flow rate into the coil, controlling superheat and system capacity. The correct orifice size is critical — an over- or under-sized piston causes poor cooling, high head pressure, or compressor flooding.

Specifications

Part number: B1789852
Component: Metering piston / flowrator orifice kit
Fits: Goodman/Amana ASH130181AC heat pump
Type: Fixed-bore refrigerant metering piston
Bore: Factory-drilled to the ASH130181AC capacity
Includes: Piston and seating components

OEM vs. Generic

Genuine Goodman pistons are precision-drilled and stamped with the exact orifice number your unit was engineered around. A generic piston with the wrong bore — even by a few thousandths — throws off superheat and subcooling, degrading efficiency and risking liquid return to the compressor. The OEM piston guarantees the charge behaves as designed.

Install Difficulty: Hard (4/5) — HVAC Pro Recommended

The piston sits inside the sealed refrigerant circuit. Recover the charge, open the liquid-line flare or the coil distributor to swap the piston, then re-seal, pull a deep vacuum, and recharge by weight while checking superheat. EPA Section 608 certification is required. We recommend a licensed HVAC technician.

Exact-fit for the ASH130181AC and backed by our fit guarantee.

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 Flow...

$5.95

Frequently Asked Questions

Does this Piston / Flowrator Kit fit my Goodman ASH130181AC Heat Pump — B1789852?

Yes. This is the factory-specified OEM piston / flowrator kit for the Goodman ASH130181AC Heat Pump — B1789852. 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 / flowrator kit on my Goodman ASH130181AC Heat Pump — B1789852?

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 / flowrator kit?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this piston / flowrator 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 / flowrator 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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