Product Description
The Goodman b1789849 is a flow check piston sized at 0.049 inches, designed for use in refrigerant metering circuits that operate on R-32 refrigerant. This small-bore piston fits inside a flow check or piston-type metering device and controls the refrigerant flow rate entering the evaporator coil. It is a direct OEM-style replacement component sourced through Danfoss LLC and is installed by licensed HVAC technicians as part of a refrigerant system service or refrigerant conversion. The compact design measures 0.5 inches in height and 15/32 inches in width, and it ships in a pack quantity of two units.
This piston is intended for HVAC systems using R-32 refrigerant where the existing flow check assembly requires a replacement metering orifice. Typical applications include residential split systems and packaged units that use a piston-type fixed metering device in place of a thermostatic expansion valve. The part is sold as a piston kit under the Goodman product line and is manufactured to OEM specifications through Danfoss LLC under vendor part number 119F7004.
Key Features
- 0.049-inch orifice diameter for precise refrigerant metering in R-32 systems
- OEM-specification replacement sourced through Danfoss LLC
- Compact form factor: 0.5 inches tall, 15/32 inches wide
- Lightweight construction at 0.017 pounds per unit
- Sold in a pack quantity of two pistons
- Manufactured in the United States
Compatibility
Designed as an OEM-style replacement flow check piston for Goodman HVAC systems using R-32 refrigerant and piston-type fixed metering devices.
Installation Notes
Installation should be performed by a licensed HVAC technician certified to handle refrigerant under Section 608 of the Clean Air Act. Recover all system refrigerant and confirm system pressure is at zero before opening any refrigerant circuit components. Inspect the flow check housing for debris or damage before seating the new piston. Do not mix piston orifice sizes within the same metering assembly.
Technical Specifications
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Orifice Size: 0.049 inches
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Refrigerant Type: R-32
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Unit Height: 0.5 inches
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Unit Width: 15/32 inches
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Unit Weight: 0.017 pounds
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Pack Quantity: 2
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Country of Origin: United States
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Vendor Part Number: 119F7004
Standard Information
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Brand: Goodman
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Manufacturer Part Number: b1789849
