Liquid-chilling systems cool water, brine, or other secondary coolant for air conditioning or refrigeration. The chiller maybe either factory-assembled and wired or shipped in sections for erection in the field. The most frequent application is water chilling for air conditioning, although brine cooling for low-temperature refrigeration and chilling fluids in industrial processes are also common. For information on absorption equipment, see Chapter 18 of the 2022 ASHRAE Handbook -- Refrigeration. GENERAL CHARACTERISTICS Principles of Operation Common Liquid-Chilling Systems Selection Control Standards and Testing General Maintenance SCROLL AND RECIPROCATING LIQUID CHILLERS Equipment Performance Characteristics and Operating Problems Method of Selection Control Considerations Special Applications CENTRIFUGAL LIQUID CHILLERS Equipment Performance and Operating Characteristics Selection Control Considerations Auxiliaries Special Applications Operation and Maintenance SCREW LIQUID CHILLERS Equipment Performance and Operating Characteristics Selection Control Considerations Auxiliaries Special Applications Maintenance