Product Description
The GOODMAN b1789874 is a flow check piston kit designed to meter refrigerant flow in split-system heat pump and air conditioning applications. The kit includes a 0.074-inch orifice piston that installs into a flow check or piston-type metering device assembly, controlling refrigerant flow rate during the cooling or heating cycle. This type of fixed-orifice metering device is a standard component in residential and light commercial refrigeration circuits. HVAC technicians select the correct piston size based on system capacity and refrigerant type to ensure proper subcooling and superheat at the indoor coil.
This piston kit is suited for split-system heat pump and central air conditioning installations where a piston-based metering device is specified. The 0.074-inch orifice size is appropriate for systems requiring a specific refrigerant flow restriction to match the system capacity. Technicians replacing a worn, damaged, or incorrectly sized piston will find this a direct-fit accessory for compatible flow check assemblies. The kit is manufactured by Danfoss LLC under vendor part number 119F2343.
Key Features
- 0.074-inch orifice diameter for precise refrigerant metering
- Fixed-orifice design provides reliable, low-maintenance flow control
- Compact form factor: 0.5 inches tall, 15/32 inches wide
- Lightweight at 0.017 pounds, minimizing handling concerns during installation
- Manufactured in the United States
- Sold with a pack multiple quantity of 20, suitable for stocking by service fleets
Compatibility
Designed as an OEM-style replacement piston for residential and light commercial split-system flow check metering device assemblies requiring a 0.074-inch orifice. Confirm orifice size against system manufacturer specifications before installation.
Installation Notes
Installation should be performed by a licensed HVAC technician with an EPA Section 608 certification, as this work involves a sealed refrigerant circuit. Recover all system refrigerant and relieve system pressure before opening any refrigerant line or metering device assembly. Verify the replacement piston orifice size matches the system design specifications — installing an incorrect piston size will result in improper system performance. After reassembly, leak-check all connections and recharge the system per the equipment manufacturer's specifications.
Technical Specifications
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Orifice Diameter: 0.074 inches
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Unit Height: 0.5 inches
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Unit Width: 0.469 inches (15/32 inches)
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Weight: 0.017 pounds
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Product Class: Conversion Kits and Orifices
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Country of Origin: United States
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Vendor: Danfoss LLC
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Vendor Part Number: 119F2343
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Pack Multiple Quantity: 20
Standard Information
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Brand: GOODMAN
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Manufacturer Part Number: b1789874
