Polycold Cryochiller Glossary
Installation and Operation Manual Refrigerant:
Brooks Automation
214072 Revision B
G-3
Refrigerant: A proprietary mixture of refrigerants made by Brooks Polycold Systems Inc.
Refrigerant circuit: The path of the refrigerant that goes from the refrigeration unit, through the feed line,
through the cryosurface, through the return line, and back to the refrigeration unit.
Refrigerant expansion tank:
A tank inside the refrigeration unit that maintains the gaseous refrigerant at a safe
pressure when the unit is not at operating temperature.
Refrigerant Line: feed and return lines that carry refrigerant to and from the cryocooler
Refrigeration unit: The machine containing the compressor, condenser, and stack that cools the refriger-
ant mixture to cryogenic temperatures.
Return Line: The copper tube in the refrigerant line that carries refrigerant from the cryosurface to
the refrigeration unit.
RS-232: A serial communication protocol that can command and configure the Polycold Cryo-
chiller using the system commands.
SAE: Society of Automotive Engineers.
TC: Thermocouple.
Top-off charge: A refrigerant mixture that can be added to the refrigerant in the Polycold Cryochiller
Transformer Tap: Jumper or connection configuration that allows for different input voltages to be used
on the system and generate the appropriate internal voltages.
TÜV: Technical Supervision Society verifies compliance with EN and IEC standards
UL: Underwriters Laboratories verifies compliance with NEC standards
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