Nordyne 664093R Restrictor

The Nordyne 664093R Restrictor Orifice is a critical metering component designed for precise refrigerant flow control in HVAC residential split systems and manufactured housing units. With a calibrated .093 orifice size (identified as #93), this fixed-bore metering device ensures the appropriate pressure drop required for efficient evaporation cycles. As the direct replacement for Nordyne 664093, this component maintains system equilibrium and prevents liquid slugging in the compressor. Technicians should verify the piston size against the outdoor unit's charging chart, particularly when matching older intertherm furnace components or Miller AC coils with modern high-efficiency condensers. This OEM Nordyne part is engineered for durability within the liquid line assembly, providing a reliable alternative to TXV systems in specific 13 SEER and 14 SEER applications. Proper installation within the refrigerant flow restrictor housing is essential for achieving the rated subcooling and superheat values across the evaporator coil.

Key Benefits

• Precise Refrigerant Metering: The .093 bore diameter provides accurate flow regulation for consistent cooling performance.
• OEM Compatibility: Engineered as a genuine Nordyne replacement part, ensuring exact fitment in Intertherm and Miller equipment.
• Direct Supersession: Seamlessly replaces legacy part number 664093 without requiring line set modifications.
• System Reliability: Fixed orifice design eliminates moving parts, reducing the risk of mechanical failure in the metering device.

Common Questions

How do I verify if the .093 restrictor is correct for my system?
Always reference the rating plate on the outdoor condensing unit. The manufacturer specifies the required restrictor size based on the BTU capacity and SEER rating of the matched indoor coil.

Can this orifice be used with both R-22 and R-410A systems?
While the orifice is a physical brass component, its application depends on the system's pressure requirements. Ensure the Nordyne 664093R matches the specific orifice chart provided by the OEM for the refrigerant type being utilized.

What are the symptoms of an incorrectly sized restrictor orifice?
An oversized orifice leads to low superheat and potential compressor damage, while an undersized restrictor orifice causes high superheat, evaporator icing, and diminished cooling capacity.

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.