A pressure-actuated refrigeration control cannot be used with which type of expansion valve?

A pressure-actuated refrigeration control is specifically designed to adjust based on the pressure readings within the refrigeration system, making it most compatible with certain types of expansion valves.

An automatic expansion valve is designed to control the flow of refrigerant based on the pressure and typically maintains a constant pressure in the evaporator. The key aspect that differentiates it from other types of expansion valves is its built-in mechanism that regulates refrigerant flow automatically, often irrespective of the need for additional control signals. Because it relies on pressure as a primary regulation method, integrating a pressure-actuated control can lead to conflicts in operation and performance issues, as both systems may try to control the pressure in similar ways.

In contrast, manual, thermostatic, and solenoid valves offer different control methods that allow for more straightforward integration with pressure-actuated controls. Manual valves rely on human adjustment, thermostatic valves operate based on temperature, and solenoid valves can open and close automatically based on an electrical signal, each aligning better with a pressure-actuated control system’s needs and functions.