What type of maintenance is commonly performed on commercial HVAC chillers?

The maintenance of commercial HVAC chillers is critical for their longevity and efficiency in cooling applications. The correct choice involves a comprehensive approach that includes cleaning coils, checking refrigerant levels, and inspecting electrical components.

Cleaning coils is vital because dirty coils can greatly reduce the efficiency of the heat exchange process, leading to increased energy consumption and operational costs. Checking refrigerant levels is essential to ensure the system is operating within the optimal range; low refrigerant can indicate leaks and can affect cooling performance. Inspecting electrical components is crucial for safety and reliability, as electrical issues can lead to system failures or malfunctions.

Other options, although they may represent aspects of maintenance, do not encompass the full scope that is typically required for chillers. Changing air filters is necessary but not sufficient on its own, as it primarily pertains to the air handling components rather than the chiller itself. Replacing compressors and fans is more indicative of repairing significant issues rather than standard maintenance tasks. Annual performance testing is important for assessing system efficiency but does not encompass the routine and crucial maintenance activities necessary to keep chillers operating effectively throughout the year.