Emerson Alco 090082 Power Assembly

The Emerson Alco 090082 (Model XB-1033HW90-1B) is a heavy-duty replacement power assembly designed for Alco XB series expansion valves. Engineered for R22 and R407C refrigeration systems, this component features a 90 PSI Maximum Operating Pressure (MOP) charge, which is essential for protecting the compressor from overload during high-load start-up periods. The assembly includes a 5-foot capillary tube and a 1/4" SAE flare external equalizer connection, ensuring accurate sensing of the evaporator outlet pressure for precise superheat control. Designed for a broad application range from -50°F to +45°F, this thermostatic expansion valve power head maintains system stability across low and medium temperature evaporation cycles. The kit comes complete with necessary capscrews for a direct field replacement, restoring factory-spec modulation to the refrigerant flow control assembly and ensuring optimal heat transfer across the evaporator coil.

• Optimized System Protection: The 90 PSI MOP prevents high suction pressure from overloading the motor during hot pull-downs.
• Extended Installation Reach: A 5' capillary tube allows for versatile sensing bulb placement even in cramped evaporator housings.
• Dual Refrigerant Compatibility: Fully rated for R-22 and R-407C retrofits or repairs.
• Reliable Pressure Balancing: The 1/4" flare external equalizer compensates for pressure drops across the distributor and evaporator.
• Field-Ready Hardware: Includes mounting capscrews to streamline the TXV power assembly replacement process.

Common HVACR Contractor Questions

What does the 90 PSI MOP charge do for the system?
The Maximum Operating Pressure (MOP) charge limits the expansion valve from opening too wide when the suction pressure exceeds 90 PSI. This is a critical safety feature that prevents the compressor motor from drawing excessive current during a warm start.

Can I use this XB-1033HW90-1B on an internally equalized valve?
No, this power assembly is specifically designed for externally equalized valves with a 1/4" flare connection. Using it on an internal equalizer body will result in incorrect superheat readings and poor system performance.

Is the power head field-replaceable without removing the entire valve?
Yes, the Emerson Alco XB series allows for top-entry replacement of the power element using the provided capscrews, provided the system is properly pumped down and the valve body remains intact.

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.