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TRG-TRC012-EN 15
period one
Components
notes
Controls and Starter
A microprocessor-based control panel is provided on the chiller to provide
accurate chilled water control as well as monitoring, protection, and adaptive
limit functions. These controls monitor the chiller’s operation and prevent the
chiller from operating outside of its limits. They can compensate for unusual
operating conditions while keeping the chiller running by modulating system
components, rather than simply tripping off due to a safety setting.
Furthermore, when problems do occur, diagnostic messages aid in
troubleshooting.
This control system not only provides accurate, optimized control and
protection for the chiller, but permits interfacing with a building automation
system for integrated system control. In a chilled water system, optimal control
is a system-wide issue, not just a chiller issue.
Because compressor motors create such a large electrical load, they cannot be
started and stopped using a simple switch or plug. A starter provides a linkage
between the motor and the electrical distribution system. Its primary function is
to connect (start) and disconnect (stop) the chiller from the line. The starter also
includes a transformer that provides power to the chiller control panel and
components to perform overload protection and current-limiting functions.
Finally, the application of a chiller starter also requires considering a means of
disconnect and short circuit protection.
Controls And Starter
control
control
panel
panel
starter
starter
Figure 24