Nordyne 669555R TXV Valve

The Nordyne 669555R is a high-capacity TR6 R22 5.6-ton TXV valve designed for precision refrigerant metering in residential and light commercial cooling systems. This thermostatic expansion valve functions as the direct mechanical replacement for the legacy 669555 model, ensuring seamless integration into existing R-22 HVAC systems. Engineered to maintain a constant superheat across the evaporator coil, this valve prevents liquid slugging and optimizes compressor longevity during high-demand cycles. The 5.6-ton rating makes it essential for large-tonnage split systems and packaged units where accurate pressure drops are critical for thermal efficiency. Technicians should verify evaporator coil compatibility and sensing bulb placement to ensure the external equalizer responds correctly to load fluctuations. By regulating flow based on evaporator outlet temperature, the 669555R valve stabilizes system performance, even in environments with varying ambient conditions, making it a standard inventory item for HVAC repair professionals maintaining older R-22 infrastructure.

• Direct Replacement: Specifically engineered to replace the obsolete 669555, eliminating the need for extensive line modifications.
• Broad Capacity: Rated for 5.6-ton cooling capacity, suitable for 60,000+ BTU applications.
• Pressure Regulation: Maintains precise refrigerant flow control to maximize heat transfer efficiency.
• System Reliability: Protects the compressor by preventing liquid refrigerant from exiting the evaporator.

Is the 669555R compatible with R-410A systems?
No, this valve is specifically calibrated for R-22 refrigerant properties and should not be used in R-410A conversions.

Does this TXV include the internal check valve?
Yes, the Nordyne 669555R is designed to handle bi-flow or standard directional flow depending on the specific equipment configuration.

Can this replace a smaller tonnage valve?
This valve is rated for 5.6 tons. Installing it on a lower-capacity system may cause "hunting" and unstable superheat levels.

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.