Chiller sequencing refers to the order in which the chillers are started and stopped to meet the changing cooling demand of the load. In a parallel chiller plant, chiller sequencing can affect the overall system efficiency and reliability. Improper chiller sequencing can lead to inefficient operation, increased energy consumption, and reduced system reliability. Variable flow systems can help resolve the issue of chiller sequencing by allowing the chillers to operate in a more flexible and efficient manner.