Emerson Alco 057235 Power Assembly

The Emerson Alco 057235 XC-726MC2B is a heavy-duty Power Assembly engineered for high-capacity R134a expansion valves. Designed for precision superheat control in commercial refrigeration and air conditioning systems, this unit features a 1/4" SAE flare equalizer connection to ensure accurate pressure sensing across the evaporator. Technical specifications include a generous 10ft capillary tube length, allowing for flexible mounting of the sensing bulb in complex piping layouts. This assembly is rated for an application temperature range of -20°F to +50°F, making it ideal for standard medium-temp and high-temp cooling applications. As a direct replacement for the XC-726MC-2B, it arrives with all necessary capscrews for secure integration onto the valve body. This component facilitates stable system performance and refrigerant flow management, ensuring the evaporator operates at peak efficiency while protecting the compressor from liquid slugging during varying load conditions.

• Universal Compatibility: Drop-in replacement for the XC-726MC-2B, streamlining service calls.
• R134a Optimization: Specifically calibrated for the pressure-temperature characteristics of R134a refrigerant.
• Extended Reach: 10-foot capillary tube provides the length needed for remote sensing bulb placement.
• Precise Pressure Response: External flare equalizer ensures accurate superheat adjustment by compensating for pressure drops.
• Complete Hardware Kit: Includes stainless steel capscrews for immediate installation.

Common Questions

How do I ensure the sensing bulb is mounted correctly?
For piping diameters larger than 7/8 inch, the bulb should be placed at the 4 or 8 o’clock position on a horizontal suction line. Always insulate the bulb to prevent ambient temperature interference.

Is the XC-726MC2B compatible with other refrigerants?
This specific power assembly is charged and calibrated for R134a. Using it with different refrigerants will lead to inaccurate superheat control and potential system instability.

What is the purpose of the 1/4" flare equalizer?
The external equalizer port monitors the actual pressure at the evaporator outlet, allowing the valve to maintain the correct superheat even if there is a significant pressure drop across the evaporator coils.

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.