At all high points of a chilled water system, what should be installed?

In a chilled water system, it's essential to manage air that can collect at high points to maintain system efficiency and prevent issues such as reduced flow or even damage to components. Installing air vents at these high points allows for the automatic release of trapped air, which can compromise the entire system's performance.

The presence of air in the piping can lead to issues like aeration, which negatively affects heat transfer and can cause hydraulic imbalances. By incorporating air vents, you ensure that any accumulated air is expelled, allowing the chilled water to flow freely and maintaining optimal operating conditions within the system.

While other components like drains, expansion tanks, and auto-fill valves play vital roles in the overall management of water systems, they do not specifically address the problem of air accumulation at high points as effectively as air vents do. Therefore, the installation of air vents is crucial for proper operation of a chilled water system at its high points.