Emerson Alco 054390 Power Assembly

The Emerson Alco 054390, also identified as the XB-1019HC2B power assembly, is a critical replacement component for high-capacity thermostatic expansion valves. Designed specifically for R22 refrigerant systems, this power element features a 1/4" SAE flare equalizer connection, ensuring accurate superheat sensing and reliable refrigerant metering across varying load conditions. Operating within an application temperature range of -20°F to +50°F, this assembly is engineered to maintain system stability in commercial refrigeration and air conditioning environments. The unit includes a 10-foot capillary tube, providing necessary flexibility for remote bulb placement on the suction line. This HVAC replacement part includes the required capscrews for a direct bolt-on installation, reducing downtime during field repairs. By utilizing a stainless steel diaphragm, the XB series provides superior resistance to corrosion and fatigue, ensuring consistent performance even in demanding high-side pressure scenarios. Ensure proper insulation of the sensing bulb to maintain precise superheat control and prevent liquid slugging back to the compressor.

• Precise Refrigerant Control: Specifically calibrated for R22 systems to ensure optimal evaporator efficiency.
• Extended Reach: The 10' capillary tube allows for versatile positioning in complex mechanical room layouts.
• Standardized Fitment: The 1/4" flare equalizer type integrates seamlessly with existing Alco valve bodies.
• Complete Kit: Includes high-grade capscrews to ensure a secure, leak-free seal between the power head and the valve cage.
• Wide Operating Envelope: Capable of handling low to medium temperature applications from -20°F to +50°F.

Is the XB-1019HC2B compatible with R407C?
While R407C has similar pressure-temperature characteristics to R22, this specific Emerson power assembly is optimized for R22. Always verify the superheat curve adjustments before using it with alternative refrigerants.

What is the purpose of the 1/4" SAE equalizer?
The external equalizer compensates for the pressure drop across the evaporator, ensuring the expansion valve reacts to the actual pressure at the coil outlet rather than the inlet.

Does this assembly include the cage and flange?
No, the 054390 is a power assembly replacement. It includes the diaphragm, capillary tube, bulb, and mounting screws, but is designed to be installed on your existing valve body and cage assembly.

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.