A chilled water system with an air-cooled condensing unit on a roof during cold weather has what type of protection?

In a chilled water system with an air-cooled condensing unit, an air limiting device is essential during cold weather to prevent potential operational issues. This type of protection is designed to manage the airflow to the condensing unit, ensuring that it does not operate under conditions that could lead to freezing of the refrigerant or the unit itself.

When the outside temperature drops significantly, air-cooled condensers can face challenges, such as reduced efficiency and potential damage if the refrigerant gets too cold. The air limiting device automatically adjusts the amount of air entering the unit based on the temperature, preventing the system from being exposed to cooling conditions that are too extreme. This helps maintain optimal performance and protects the unit from freezing, ensuring reliable operation throughout colder months.

This context highlights why an air limiting device is vital for maintaining the integrity of an air-cooled condensing unit during cold temperatures, indicating that the chosen protection effectively addresses specific weather-related challenges.