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80 TRG-TRC016-EN
notes
period four
Chiller-Plant Control
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.
Chiller Controls
▲ Start–stop
▲ Chilled-water
temperature
control
▲ Monitor and
protect
▲ Adapt to
unusual
conditions
Figure 88