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

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SAFETY - PRECAUTIONS AND FEATURES
5
SAFETY FEATURES
Cincinnati Sub-Zero incorporates many safety features in the design of its
equipment. These safety features provide protection for the equipment, as well
as for operating and maintenance personnel. SEE WARNING.
ELECTRICAL CIRCUIT PROTECTION
1.
All power circuits and control circuits are separately protected by circuit
breakers or fuses.
2. Compressors have internal inherent electrical overload protection which
will shut down the compressor in the event of an electrical or thermal
overload.
3. All power to the chamber heaters passes through a non-cycling power
contactor. This contactor is controlled by the chamber over-temperature
limit and an optional High/Low test limit control and is de-energized if
either a chamber is over-temperature, or a test item over/under-
temperature condition exists.
REFRIGERATION SYSTEM PROTECTION
1.
The refrigeration systems utilize refrigerants which are non-flammable and
non-explosive.
2. The refrigeration system is equipped with pressure controls. These controls
will shut down the compressor if a high or low pressure condition is
reached. Refer to the Refrigeration Flow Diagram and the Electrical
Schematic for the specific pressure controls on your unit. Contact Cincinnati
Sub Zero with any questions.
OVER-TEMPERATURE PROTECTION
The high temperature cutoff is installed to protect the chamber from exceeding
design limits. This safety device removes power only from the chamber heaters
when an over-temperature condition exists in the chamber. They DO NOT
remove power from the product being tested.
PRODUCT HIGH LIMIT (IF EQUIPPED)
The product high temperature limit can be used to protect the product being
tested and the chamber from overheating. The thermocouple hanging from the
back of the chamber can be attached to the customer product. The product
safety should be checked for proper operation every three (3) months.
CHAMBER HIGH LIMIT
This device is intended for chamber over-temperature protection only. It is
preset to open at the temperature indicated on the Electrical Schematic.
DO NOT BYPASS any of the
safety features provided in
this equipment. Failure to
follow these instructions
could result in serious
personal injury or death.
WARNING
WARNING
DO NOT touch refrigeration
lines while the unit is in
operation. Lines can become
extremely hot or very cold
and can cause severe burns.
Cincinnati Sub-Zero
chambers are equipped
with high heat limits, or
safety devices. These safety
devices are installed to
protect the unit from
exceeding design limits.
These safety devices
remove power ONLY from
the chamber heaters and
DO NOT remove power
from your product.
Provisions must be made to
de-energize the product
under test and the chamber
in the event of an over-
temperature condition.
WARNING
The chamber high limit and
other latching thermostats
and thermal cut outs can
only be reset by properly
trained service personnel.
Only access the chamber
sub panel or remove any
side rear service panels if
you are a qualified service
personnel.
WARNING