In a refrigeration schematic, what does the designated symbol indicate regarding the pressure?

The designated symbol in a refrigeration schematic indicates a function related to pressure control in the system. When the symbol indicates that it "opens on rising pressure," it means that as the pressure in the system increases beyond a certain threshold, the component will activate, allowing the refrigeration cycle to continue or adjust as necessary. This is crucial for ensuring that the system operates efficiently and prevents pressure from exceeding safe limits.

In refrigeration systems, components such as pressure switches play a vital role in maintaining the system's overall functionality. By opening when pressure rises, these components help to regulate and protect the machinery, ensuring that pressure does not become dangerously high, which could lead to system failure or inefficiency.

Understanding this aspect of pressure control is essential for those working with refrigeration systems, as it directly impacts the performance and safety of the installation.