Emerson Alco 056421 Power Assembly

The Emerson Alco 056421 (Model XC-726HC2B) is a field-proven thermostatic expansion valve power assembly designed for high-capacity R22 refrigerant systems. This stainless steel replacement head is compatible with Alco T-Series take-apart valves, including TER, TIR, THR, and TMR bodies, making it a staple for large-scale air conditioning and heat pump maintenance. Featuring a 10-foot capillary tube and a 1/4" SAE flare equalizer, this assembly provides the reach and precision required for complex evaporator coils. It operates effectively across a temperature range of -20°F to +50°F, ensuring stable superheat control in medium and high-temperature applications. The package includes the necessary capscrews for immediate installation on existing valve bodies, maintaining a maximum working pressure of 450 psig. Professional-grade construction prevents diaphragm fatigue, providing technicians with a reliable solution for restoring peak system efficiency without full valve replacement.

• OEM Compatibility: Specifically engineered for Alco T-Series take-apart valves to ensure a leak-proof seal and precise superheat regulation.
• Durable Stainless Steel: Resists corrosion and mechanical stress, extending the service life of the TXV power head in harsh environments.
• Extended Capillary: The 10-foot lead allows for flexible bulb placement on large suction lines to optimize sensing accuracy.
• Complete Kit: Includes high-tensile capscrews to reduce downtime during field service and ensure proper torque application.
• Versatile Application: Optimized for R-22 systems in both standard refrigeration and high-load heat pump cycles.

Can the XC-726HC2B be used with R-407C systems?
While R-407C shares similar pressure-temperature characteristics with R-22, this specific XC series power assembly is factory-charged for R-22. Substituting refrigerants can lead to incorrect superheat settings and potential compressor floodback unless the valve is manually recalibrated for the new pressure curve.

What is the correct torque for the mounting capscrews?
For a secure, leak-free installation on T-series bodies, technicians should tighten the included capscrews to approximately 300 inch-pounds. Ensuring even pressure across the diaphragm prevent bypass leaks and maintains the integrity of the thermal expansion valve.

Does this assembly include the internal cage or orifice?
No, the 056421 is a replacement power assembly (head) only. The cage and body flanges are separate components of the T-series take-apart design, allowing you to replace only the sensing element if the mechanical orifice is still functional.

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.