Polycold Cryochiller
Installation
Installation and Operation Manual
Installation Overview
Brooks Automation
214072 Revision B
4-3
Installation Overview
Before starting installation, review the items in this section to confirm that the installation location meets
the requirements of the Cryochiller and that the proper components have been selected and are avail-
able to perform the installation.
Component Description
Confirm that each of the main components of the Polycold Cryochiller are available for installation.
•
Refrigeration Unit
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Refrigerant Line
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Cryosurface; one of two types:
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Coil - for water vapor cryotrapping
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Baffle - usually used to minimize oil back streaming
•
Cryogenic feedthrough, which routes the refrigerant lines through the vacuum chamber wall
Installing a Refrigeration Unit to Meet ASHRAE Requirements
The following information helps to comply with ANSI / ASHRAE 15-1994 “Safety Code for Mechanical
Refrigeration.”
•
ANSI is for the American National Standards Institute.
•
ASHRAE is for the American Society of Heating, Refrigeration, and Air Conditioning Engineers.
Normally, the manufacturer provides the type and amount of refrigerant used in the refrigeration unit.
However, Polycold considers their mixtures of refrigerants to be proprietary. Therefore, the following
information complies with the above standards.
•
The amount of refrigerant mixture, the minimum room size, and the refrigerant safety group
classification are included next to the refrigeration unit's nameplate.The nameplate is located
on the frame under the lower left front panel or above the water connection panel, lower right
front panel.
•
Brooks determined the refrigerant safety group classification of the refrigerant mixture by eval-
uating the safety group classifications of the individual components. This evaluation used ANSI
/ ASHRAE-34 and EN 378.1 as a guide.
•
The Polycold Cryochiller is a “direct (refrigeration) system”. It is only intended to be installed
above ground in an industrial environment.
•
To comply with the Safety Code for Mechanical Refrigeration, ANSI/ASHRAE-115-2007, the
units should be located in a room no smaller than listed.
•
If the minimum room size indicated on the nameplate is not obtainable, the refrigeration unit
must be installed in a “refrigerating machinery room”. Consult local or national building codes
for machinery room requirements.
•
See section 9.7.8 of ANSI / ASHRAE 15- 1994 for location requirements.
•
Only A1 refrigerants are used on MaxCool systems. According to ASHRAE 15 and EN 378, it
is permissible for the pressure relief valves to vent into the equipment cabinet. This assumes
the unit is installed above ground and in a room that meets the minimum room volume.
