An automatic expansion valve does not:

The correct answer highlights that an automatic expansion valve does not react well in situations of heavy loads. An automatic expansion valve (AEV) is designed to maintain a specific pressure in low-pressure refrigeration systems, primarily in applications where the load variations are minimal. It operates by adjusting the flow of refrigerant to maintain that set pressure effectively.

In situations of heavy loads, the demand for refrigerant can exceed the capacity of the AEV to adjust appropriately, leading to potential issues such as insufficient cooling performance or inefficient refrigerant flow. This is because the automatic adjustments of the valve may not be able to keep up with rapid changes in the load, causing it to become ineffective.

The other options reflect characteristics or functions that are associated with automatic expansion valves. They generally respond well in low-pressure systems and adjust themselves automatically based on the pressure within the system, allowing for control of refrigerant flow under less stressed conditions. However, heavy load conditions can overwhelm these capabilities, leading to inadequate performance.