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How it Works: Component Listing
Water system
• Motor/Pump assembly - The motor/pump assembly circulates chilled
coolant through the process loop. The pump assembly is built with brass to
maintain water quality.
Refrigeration system
• Compressor - Hermetic compressor takes low-pressure, low-temperature
refrigerant gas and compresses the gas into high-pressure, high-temperature
vapor.
•
Air-cooled condenser - The air-cooled condenser removes heat BTUs from
the compressor refrigerant gas. The action causes the gas to “condense” into a
liquid state still under high pressure. Air flow across the condenser is
achieved by a motor driven fan.
•
Fan cycling switch - The fan cycling switch is adjustable when the chiller is
in an environment cooler than 95°F {35°C}. See Appendix J entitled,
Plumbing Schematic.
• Filter-dryer - The filter-drier removes contaminants and moisture from the
liquid refrigerant.
• Liquid receiver - Serves as a collection tank for high-pressure liquid
refrigerant to ensure total charge at all times.
• Refrigerant sight glass - The refrigerant sight glass indicates refrigerant
charge and moisture content. Refrigerant charge is determined by a clear
liquid flow. Bubbles indicate low refrigerant. Moisture content is indicated by
the color of the sight glass view port element. The element’s color is normally
green. If the color of the element is dark brown or yellow, the system has
been contaminated with moisture and the refrigerant circuit needs to be
serviced by a qualified refrigerant service technician. See Maintenance
section entitled, Checking the Refrigerant Charge and Quality.
• Expansion valve - The expansion valve meters flow of liquid refrigerant
into the evaporator and creates a pressure drop in the refrigerant system that
allows the liquid refrigerant to “boil off” inside the evaporator.
2-6 l Description
(continued)