Carrier 17/19EX - Manual (Page 40)

Cooler
This vessel (also known as the evaporator) is located underneath the condenser, next to the
utility vessel. The cooler is maintained at lower temperature/pressure so that evaporating
refrigerant can remove heat from water flowing through its internal tubes.
Condenser
The condenser operates at a higher temperature/pressure than the cooler, and has water
flowing through its internal tubes in order to remove heat from the refrigerant.
Motor-Compressor
This component maintains system temperature/pressure differences and moves the heat
carrying refrigerant from the cooler to the condenser.
Control Center
The control center is the user interface for controlling the machine and regulates the machine
capacity as required to maintain proper leaving chilled water temperature. The control center:
• registers cooler, condenser, and lubricating system pressures
• shows machine operating condition and alarm shutdown conditions
• records the total machine operating hours and how many hours the machine has
been running
• sequences machine start, stop, and recycle under microprocessor control
• provides access to other CCN (Carrier Comfort Network) devices