Introduction Polycold Cryochiller
Theory of Operation Installation and Operation Manual
Brooks Automation
1-4
214072 Revision B
Polycold Cryochiller Versions
The Polycold Cryochiller is manufactured in different models and configurations to fit a variety of appli-
cations. Table 1-1 shows the currently manufactured Cryochiller model numbers and their description.
Contact Brooks Sales for optional configurations.
Theory of Operation
The Polycold MaxCool Cryochiller employs a patented non-flammable HCFC-free refrigerant mixture in
an auto-refrigerating cycle (ARC) cooling process to provide operating temperatures from -80°C to
-150°C.
This process, which is thermodynamically more efficient than a multistage cascade process, combines
all of its refrigerants into a single multi-component stream circulated by one compressor.
The advantages of the mixed refrigerant ARC cooling process are reduced system complexity, more
favorable operating conditions, lower maintenance, and greater reliability.
Table 1-1: Polycold Cryochiller Models and Descriptions
Configuration Description
MaxCool 4000H Optimized for maximum water vapor cryopumping speed and maxi-
mum vacuum process throughput (formerly XC-8800 HC)
MaxCool 2500L Optimized for minimum water vapor partial pressure and maximum
vacuum process quality (formerly XC-8800 MT)
Figure 1-2: Refrigeration Flow Diagram
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