What are the specs for this Piston?

The correct replacement for Goodman model ASZ130241AF Heat Pump — B1789857 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 ASZ130241AF Heat Pump — B1789857.

What symptoms indicate I need a new piston?

Common symptoms that indicate you need a new piston 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 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.

IMAGE COMING SOON

Goodman

OEM Goodman Piston (Flowrator) Kit for ASZ130241AF Heat Pump — B1789857

Name: OEM Goodman Piston (Flowrator) Kit for ASZ130241AF Heat Pump — B1789857
Brand: Goodman
SKU: GOODMAN-16174
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16174 Brand: Goodman

$5.95 $7.99

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The Goodman B1789857 Piston Kit is the genuine OEM flowrator (fixed-orifice metering device) for the ASZ130241AF heat pump. This precision-drilled piston controls the rate of liquid refrigerant entering the coil, setting the pressure drop that lets the refrigerant boil off and absorb heat. The correct orifice diameter is what delivers rated capacity and efficiency — an incorrect size will starve or flood the coil and hurt both heating and cooling performance.

Specifications

OEM Part Number: B1789857
Type: Fixed-orifice piston / flowrator metering device
Fits Model: ASZ130241AF (Goodman heat pump)
Function: Meters liquid refrigerant flow into the coil
Installation: Seats inside the liquid-line distributor / metering body
Application: Split-system heat pump — matched orifice sizing

OEM vs. Generic

Piston sizing is model-specific and stamped to a precise bore. The OEM B1789857 is the exact orifice Goodman specifies for the ASZ130241AF, guaranteeing rated subcooling and superheat. A generic or wrongly-sized piston is one of the most common causes of poor capacity and high energy bills after a repair. For correct system performance, always use the OEM piston.

Installation Difficulty

Professional / Difficult (4/5). Replacing the piston opens the sealed refrigerant circuit. It requires refrigerant recovery, disassembly of the metering fitting, correct piston orientation, then evacuation and recharge. This job should be completed by an EPA 608-certified HVAC 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 Piston (Flowrator) K...

$5.95

Frequently Asked Questions

Does this Piston fit my Goodman ASZ130241AF Heat Pump — B1789857?

Yes. This is the factory-specified OEM piston for the Goodman ASZ130241AF Heat Pump — B1789857. 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 on my Goodman ASZ130241AF Heat Pump — B1789857?

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?

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

Is this piston 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?

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.

Menu