Copeland Comfort Control (Alco) 057878 Power Assembly

The Copeland Comfort Control (Alco) 057878 Power Assembly is a high-performance replacement component for thermostatic expansion valves used in medium and high-temperature refrigeration. This unit, also identified as the XB-1019MC1B, is specifically charged for R134a refrigerant applications. It features a 1/4" SAE flare equalizer and a 5-foot capillary tube, providing the necessary reach for complex evaporator coil configurations. Designed for a wide application temperature range of -20°F to +50°F, this power assembly ensures precise superheat control and system stability. The XB series power assembly is built for durability in commercial environments, and this kit includes the required capscrews for a secure mechanical connection to the valve body. Whether you are performing a TXV repair or a system retrofit, this genuine Alco component maintains the factory-spec pressure-temperature relationship required for efficient evaporator loading.

• Universal Compatibility: The 057878 is identical to the XB-1019MC-1B, ensuring a direct fit for existing Alco valve bodies.
• Precise Superheat Control: Optimized for R134a to prevent liquid slugging and ensure maximum heat transfer.
• Flexible Installation: The 5-foot capillary tube allows for optimal bulb placement even in cramped mechanical compartments.
• Field Ready: Included capscrews eliminate the need for extra hardware during a service call.
• Durable Construction: Engineered to withstand the vibration and thermal cycling common in commercial HVACR systems.

Is this power assembly compatible with refrigerants other than R134a?
No, this specific model is calibrated with a MOP (Maximum Operating Pressure) or charge specific to R134a. Using it with other refrigerants will result in incorrect superheat settings and potential compressor damage.

Does this include the cage or the valve body?
This is the power assembly only (including the diaphragm, capillary tube, bulb, and capscrews). The valve body and internal cage must be ordered separately if you are building a complete TXV.

What is the purpose of the 1/4" SAE flare connection?
This is the external equalizer connection, which allows the valve to compensate for pressure drops across the evaporator, ensuring more accurate superheat control than internally equalized valves.

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.