Amana-Goodman B1789874 Piston

The Amana-Goodman B1789874 Piston is a precision-engineered OEM flow check piston specifically designed for 2.5-ton R22 HVAC systems. As a critical component in the refrigeration cycle, this metering device ensures the correct volume of refrigerant enters the evaporator coil, maintaining the thermal balance of your Goodman or Amana air conditioning or heat pump unit. By utilizing an authentic replacement HVAC piston, technicians can restore factory-spec cooling capacity and prevent common issues like compressor liquid slugging or inefficient heat transfer. This orifice assembly is manufactured to rigorous standards, providing the exact bore diameter required for R-22 pressure drops in 30,000 BTU applications. Whether you are performing a seasonal tune-up or a major system repair, installing this genuine Goodman B1789874 part ensures seamless compatibility and optimized system efficiency for long-term climate control performance.

Key Benefits:

• Optimized Refrigerant Metering: Ensures precise flow control for 2.5-ton systems, maximizing cooling output.
• Direct OEM Replacement: Guaranteed fit for select Amana and Goodman indoor coils and outdoor condensers.
• System Longevity: Helps maintain proper head pressures, reducing unnecessary strain on the compressor.
• R22 Compatibility: Specifically calibrated for the pressure characteristics of R22 refrigerant cycles.
• Robust Construction: Built with high-grade materials to resist wear and maintain tight tolerances over time.

Common Questions:

What does a flow check piston do in an AC system?
The flow check piston acts as a fixed-orifice metering device that regulates refrigerant flow into the evaporator. It also allows for free flow in the opposite direction during the heating cycle in heat pump applications.

How do I know if the B1789874 piston is right for my unit?
This piston is designed for 2.5-ton R22 systems. You should verify the size stamped on your existing piston or check the technical manual for your specific Goodman or Amana model to ensure a match.

Can this piston be used with R410A systems?
No, this specific piston is calibrated for R22 refrigerant. Using an R22 piston in an R410A system will lead to improper metering and potential equipment failure due to different operating pressures.

Safety Information:
California Proposition 65 Warning: This product may contain materials known to the State of California to cause cancer, birth defects, or other reproductive harm.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.