Cincinnati Sub-Zero ZP Series, Installation, Operation & Maintenance Manual

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GENERAL DESCRIPTION
17
Some options may be equipped with a GFCI Receptacle for power. If any
options are installed in this manner, check the GCFI Receptacle(s) monthly.
OPTIONS
PEN RECORDERS (OPTIONAL)
The Circular Chart Recorder features fully programmable inputs, ranging, and
linearization, with stepper motor, pen, and chart drive speed. This eliminates
the need for range cards and chart speed change gears. Configuration is field
programmable for flexibility to meet changing test requirements. Refer to the
chart recorder manual on the digital media, or supplemental booklet, if
applicable.
Replacement chart paper is available from the CSZ Service Department.
REDUNDANT HIGH/LOW LIMIT CONTROL (OPTIONAL)
The High/Low Limit Control is designed with set-points for high and low
temperatures. These can be precisely set at temperatures to permit safe
operation. The Limit Control will shut down the chamber operation and product
operation if the safe operating temperature limit of the product, either hot or
cold, has been exceeded.
IEEE-488 SYSTEM (OPTIONAL)
An optional IEEE communication interface can be provided on the chamber to
allow the EZT-570S to communicator over the GPIB bus.
LN2/CO2 BOOST COOLING SYSTEM (OPTIONAL)
In addition to the main refrigeration system, the chamber is equipped with an
optional connection port for supplying boost cooling from an external source of
cryogenic liquefied gas (either carbon dioxide or liquid nitrogen). The boost
cooling gas is vented directly into the chamber by a controller under the
conditions of sustained cooling demand.
Refer to the System Diagrams Chapter to see the schematic diagram for the
boost cooling system when using LN2 as the boost cooling agent.
LN2 can be supplied in one of two ways, either by an LN2 Cylinder or with a
central supply using vacuum jacketed lines.
When using an LN2 Cylinder, it must be connected with a well insulated line that
is at least 3/8” inside diameter. The line length should be 5FT (152 cm) or less.
The LN2 tank should have a maximum supply pressure of 25 PSIG (274 kPa) and
be able to provide 0.60 gallons/min.
With a central supply using vacuum jacketed lines, there is no maximum line
length.
If any options are installed
using a GFCI Receptacle,
check the GCFI Receptacle(s)
monthly.
CAUTION
The redundant high/low
limit has a red LED display
which displays a “SAFE”
condition when
temperature has returned
to safe conditions, press the
“RESET” button to reset the
limit.
NOTE
Gaseous Nitrogen/CO2 vent
must be ducted outdoors to
prevent displacement of
oxygen around the unit.
Asphyxia can occur if this is
not installed properly.
WARNING
Wear appropriate PPE when
handling LN2 connections.
WARNING