Emerson Alco 025011 Power Assembly

The Emerson Alco 025011 Power Assembly (model XC-726HW652B) is a heavy-duty replacement component engineered for large-capacity thermostatic expansion valves in high-pressure commercial refrigeration and HVAC systems. Designed specifically for R-22 refrigerant, this assembly features a 65 PSI Maximum Operating Pressure (MOP) charge, protecting the compressor from overload during startup or high-load conditions by limiting evaporator pressure. The unit utilizes a 1/4" SAE flare equalizer connection for precise pressure sensing and includes a 10-foot capillary tube to provide installation flexibility across varied evaporator configurations. With an application temperature range of -50°F to +30°F, it maintains consistent superheat control in low and medium-temperature applications. This interchangeable power element comes with necessary capscrews for secure mounting, ensuring a leak-proof seal and reliable diaphragm response under fluctuating thermal loads.

Key Benefits for Contractors

• MOP Protection: The 65 PSI MOP charge prevents suction pressure spikes, reducing stress on the compressor motor.
• Corrosion Resistance: The stainless steel diaphragm and rugged construction withstand harsh mechanical room environments.
• Extended Reach: The 10' capillary length is ideal for large DX evaporators where the valve body and sensing bulb are widely separated.
• Field Serviceable: Simplifies repairs by allowing the replacement of the power element without reclaiming the entire refrigerant charge or removing the valve body.

Common Questions

Can I use the XC-726HW652B with R-407C systems?
While R-407C pressures are similar to R-22, this assembly is factory-charged specifically for R-22 pressure-temperature curves to ensure accurate superheat. Using it with other refrigerants may result in erratic valve hunting.

Does this assembly include the replacement gaskets and screws?
Yes, this power assembly includes the requisite capscrews to ensure a proper torque-sealed fit to the XC series valve body.

What is the purpose of the 65 PSI MOP?
The Maximum Operating Pressure feature keeps the valve closed until the suction pressure drops below 65 PSI, preventing the motor from stalling or tripping on high amperage during a hot pull-down.

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.