Emerson Alco 097795 Driver Module

The Emerson Alco 097795 is a high-performance Universal Electronic Expansion Valve Driver Module (Model EXD-U01) engineered for precise refrigerant mass flow control. This unit serves as the direct replacement for EXD-U00 and previous EXD-U01 iterations, providing a seamless field upgrade for legacy systems. Operating on 24Vac/dc, the module features a versatile 4-20mA or 0-10V analog input for flexible integration with standard third-party controllers. It is specifically designed to drive bipolar stepper motor valves, such as the Alco EX4, EX5, EX6, EX7, and EX8 series. The module incorporates a 24Vac/dc digital input for compressor start/stop synchronization, ensuring the valve closes fully during power loss or system shutdown to prevent liquid slugging. Its plug-and-play DIN-rail mounting and distinct dip-switch configurations allow technicians to calibrate the stepper motor driver for specific valve requirements, optimizing superheat control and system efficiency in demanding commercial refrigeration and HVAC applications.

Key Benefits

• Universal Compatibility: Operates as a universal controller for the entire Emerson EX series of electronic expansion valves.
• Flexible Signal Interface: Supports both voltage and current analog inputs, making it compatible with a wide range of PLC and DDC systems.
• Fail-Safe Operation: The digital input ensures the valve reaches a fully closed position during system transitions to protect the compressor.
• Simplified Serviceability: Direct footprint replacement for the 097795 and older EXD models reduces downtime during field retrofits.
• Robust Stepper Control: High-resolution bipolar driving technology provides stable refrigerant flow and prevents hunting under varying load conditions.

Common Questions

Is the EXD-U01 compatible with non-Emerson valves?
The EXD-U01 is optimized specifically for the bipolar stepper motors found in Emerson Alco EX4 through EX8 valves; using it with other brands may result in incorrect step rates or drive current.

How do I configure the input signal on the 097795?
The module features internal dip-switches that allow the technician to toggle between 4-20mA and 0-10V analog signals based on the controller output.

Does this module require a separate battery backup for closing?
While the Emerson EXD-U01 manages the valve position via the digital input, ensuring a constant 24V supply to the module is critical for the "close" command to execute upon system standby.

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.