Trane TRG-TRC016-EN manual period four, Chiller Controls, notes, Chiller-PlantControl

period four

Chiller-Plant Control

notes

Chiller Controls

▲Start–stop

▲Chilled-water temperature control

▲Monitor and protect

▲Adapt to unusual conditions

Figure 88

The largest change to chillers in the last decade has undoubtedly been in the area of controls. In the past, chillers were pneumatically controlled, and they were protected by turning them off if the flow rates or temperatures changed too quickly. Today’s microprocessor-based controls provide accurate chilled- water temperature control, as well as monitoring, protection, and adaptive limit functions.

These controls monitor chiller operation and prevent the chiller from operating outside its acceptable limits. They can also adapt to unusual operating conditions, keeping the chiller operating by modulating its components and sending a warning message, rather than doing nothing more than shutting it down when a safety setting is violated. Improved control accuracy allows chillers to be applied in systems and applications that were previously avoided. When problems occur, diagnostic messages aid troubleshooting. Modern chiller controls also interface with a chiller-plant control system for integrated system operation.

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