CSZ ZP Series Instruction manual

Installation
Operation
Maintenance
Manual
ZP-Series
56120 REV AH
10/2019

INTRODUCTION
Note: CSZ is continuously upgrading the components used
in its equipment. Consequently, the physical appearance of
certain components may vary from that shown.

INTRODUCTION
INTRODUCTION
This manual has been tailored to match the specific features and options provided on
your Temperature Chamber at the time of original manufacture. The last section of the
manual is the specific information section. This area was developed in an attempt to
better define items on CSZ chambers that are “SPECIFIC” to a customer. Please refer
to this section for warranty, controller PID parameters, and calibration/verification test
data sheets.
Cincinnati Sub-Zero Temperature Chamber:
MODEL NO.
SERIAL NO.
DO NOT USE THIS MANUAL IN AN ATTEMPT TO OPERATE OR MAINTAIN ANY
OTHER MODEL OR SERIAL NUMBER.
PLEASE READ THIS ENTIRE MANUAL BEFORE OPERATING THIS UNIT.

INTRODUCTION
THIS PAGE INTENTIONALLY LEFT BLANK

CHAMBER LABELS & MEANINGS
CHAMBER LABELS AND MEANINGS
Some graphical safety labels may be replaced with textual
based safety labels. Read the entire manual for other safety
information that is applicable to our chamber.

CHAMBER LABELS & MEANINGS
THIS PAGE INTENTIONALLY LEFT BLANK

TABLE OF CONTENTS
CHAPTER 2
GENERAL DESCRIPTION
CHAPTER 1
SAFETY PRECAUTIONS-FEATURES
INTRODUCTION......................................................................................................................................... 1-1
GENERAL SAFETY PRECAUTIONS......................................................................................................... 1-1
ELECTROSTATIC DISCHARGE SENSITIVE DEVICES............................................................................ 1-4
SAFETY FEATURES .................................................................................................................................. 1-5
ELECTRICAL PROTECTION ..................................................................................................................... 1-5
REFRIGERATION SYSTEM PROTECTION............................................................................................... 1-5
OVER-TEMPERATURE PROTECTION ..................................................................................................... 1-5
PRODUCT HIGH LIMIT (OPTIONAL EQUIPMENT)................................................................................. 1-5
FIGURES AND TABLES
FIGURE 1. COMMUNICATION PLATES ..................................................................................................................... 1-6
SYSTEM DESCRIPTION ........................................................................................................................... 2-1
CONTROLLER............................................................................................................................................ 2-1
CHAMBER .................................................................................................................................................. 2-1
REFRIGERATION/HEATING COMPONENTS ........................................................................................... 2-2
HUMIDITY ................................................................................................................................................... 2-5
PEN RECORDERS (OPTIONAL EQUIPMENT)....................................................................................... 2-11
REDUNDANT HIGH/LOW LIMIT CONTROL (OPTIONAL EQUIPMENT)............................................... 2-11
IEEE-488 SYSTEM (OPTIONAL EQUIPMENT)....................................................................................... 2-11
LN2/CO2 BOOST COOLING SYSTEM (OPTIONAL EQUIPMENT)........................................................ 2-11
PROGRAMMABLE DOOR LOCK (OPTIONAL EQUIPMENT)................................................................ 2-12
GN2 PURGE SYSTEM (OPTIONAL EQUIPMENT) ................................................................................. 2-12
DRY AIR PURGE (OPTIONAL EQUIPMENT).......................................................................................... 2-12
LIMITED TEMPERATURE SHEATH HEATERS (OPTIONAL EQUIPMENT) .......................................... 2-12
GAS MONITOR (OPTIONAL EQUIPMENT) ............................................................................................ 2-12
CHAMBER PERFORMANCE................................................................................................................... 2-13
SEQUENCE OF OPERATION .................................................................................................................. 2-18
FIGURES AND TABLES
FIGURE 1. CHAMBER COMPONENTS LOCATION ................................................................................................... 2-3
FIGURE 2. ZPRC CHAMBER - SIDE VIEW ................................................................................................................ 2-4
FIGURE 3. ZPRC CHAMBER - TOP VIEW.................................................................................................................. 2-4
FIGURE 4. ACHIEVABLE HUMIDITY POINTS ............................................................................................................ 2-6
FIGURE 5. OPTIONAL RECIRCULATING WATER/DEMINERALIZER FILTER.......................................................... 2-7
FIGURE 6. HUMIDITY PANEL LOCATION & COMPONENTS.................................................................................... 2-8
FIGURE 7. CHAMBER INTERIOR............................................................................................................................. 2-10
FIGURE 8. SHELF AND BRACKET........................................................................................................................... 2-13
FIGURE 9. SHELF IN PULLED OUT POSITION....................................................................................................... 2-13
TABLE 1. ZP(H) SPECIFICATIONS ........................................................................................................................... 2-14
TABLE 2-4. ZP LOAD CAPACITY AND ELECTRICAL REQUIREMENTS................................................................. 2-14
TABLE 5. ZP SINGLE STAGE SPECIFICATIONS ..................................................................................................... 2-16
TABLE 6. ZP CASCADE SPECIFICATIONS.............................................................................................................. 2-16
TABLE 7. ZP TUNDRA SPECIFICATIONS ................................................................................................................ 2-17

TABLE OF CONTENTS
CHAPTER 3
INSTALLATION
PREPARATION FOR USE.......................................................................................................................... 3-1
MAIN POWER CONNECTION.................................................................................................................... 3-3
VOLTAGE CHANGE ON ZP CHAMBERS ................................................................................................. 3-4
REFRIGERATION SYSTEM PRESSURES ................................................................................................ 3-4
WATER COOLED UNITS (OPTIONAL EQUIPMENT) .............................................................................. 3-4
SCROLL COMPRESSORS ONLY.............................................................................................................. 3-6
HUMIDITY SYSTEM (OPTIONAL EQUIPMENT) ...................................................................................... 3-6
FIGURES AND TABLES
FIGURE 1. TRANSPORTING A CHAMBER ................................................................................................................ 3-2
FIGURE 2. INSTALLATION LOCATIONS .................................................................................................................... 3-7
TABLE 1. WATER USAGE TABLE (ENGLISH UNITS) ................................................................................................ 3-5
TABLE 1. WATER USAGE TABLE (SI UNITS)............................................................................................................. 3-6
CHAPTER 4
OPERATING INSTRUCTIONS
START-UP INSTRUCTIONS SUMMARY (EZT-570S CONTROLLER)...................................................... 4-1
PUMPDOWN............................................................................................................................................... 4-2
SINGLE SET POINT OPERATION ............................................................................................................. 4-3
MANUAL EVENT CONTROL ..................................................................................................................... 4-4
PROFILE OPERATION............................................................................................................................... 4-4
START-UP INSTRUCTION SUMMARY (WATLOW F4 CONTROLLER) (OPTIONAL EQUIPMENT)....... 4-5
SUMMARY FOR STEP-BY-STEP SET-POINT OPERATION .................................................................... 4-5
WATLOW F4 CONTROLLER OUTPUTS ................................................................................................... 4-6
DRY AIR PURGE (OPTIONAL EQUIPMENT)............................................................................................ 4-8
IEEE 488 - F4 CONTROLLER (OPTIONAL EQUIPMENT)........................................................................ 4-9
HIGH/LOW LIMIT CONTROL (OPTIONAL EQUIPMENT)....................................................................... 4-10
PROGRAMMABLE DOOR LOCK (OPTIONAL EQUIPMENT)................................................................ 4-10
VAISALA HMT337 HUMIDITY AND TEMPERATURE TRANSMITTER (OPTIONAL EQUIPMENT) ...... 4-10
START-UP INSTRUCTIONS SUMMARY - REMOTE SENSOR (OPTIONAL EQUIPMENT) .................. 4-11
AIR SUPPLY DAMPER............................................................................................................................. 4-12
ATTACHING GLOVES.............................................................................................................................. 4-13
FIGURES AND TABLES
FIGURE 1. CSZ EZT-570S CONTROLLER ................................................................................................................. 4-1
FIGURE 2. WATLOW F4 CONTROLLER OUTPUTS .................................................................................................. 4-7
FIGURE 3. DRY AIR PURGE COMPONENTS LOCATION ......................................................................................... 4-8
FIGURE 4. CONTROLLER PANEL............................................................................................................................ 4-11
FIGURE 5. AIR SUPPLY DAMPER............................................................................................................................ 4-12

TABLE OF CONTENTS
CHAPTER 5
MAINTENANCE WITH Q & A
GENERAL MAINTENANCE ....................................................................................................................... 5-1
TEST EQUIPMENT REQUIRED................................................................................................................. 5-1
INSPECTION SCHEDULE.......................................................................................................................... 5-2
VISUAL INSPECTION ................................................................................................................................ 5-5
TROUBLESHOOTING PROCEDURES...................................................................................................... 5-5
SYSTEM TROUBLESHOOTING ................................................................................................................ 5-5
SATURATED TEMPERATURE/PRESSURE CHARTS ............................................................................ 5-12
PFC REFRIGERANTS.............................................................................................................................. 5-14
RESETTING A CIRCUIT BREAKER ........................................................................................................ 5-14
HUMIDITY SYSTEM MAINTENANCE...................................................................................................... 5-15
WATER QUALITY ..................................................................................................................................... 5-17
QUESTIONS & ANSWERS ...................................................................................................................... 5-18
FIGURES AND TABLES
FIGURE 1. ATOMIZING NOZZLE COMPONENTS ................................................................................................... 5-15
TABLE 1. TEST EQUIPMENT REQUIRED .................................................................................................................. 5-1
TABLE 2. INSPECTION SCHEDULE........................................................................................................................... 5-2
TABLE 3. INSPECTION PROCEDURES ..................................................................................................................... 5-5
TABLE 4. GENERAL TROUBLESHOOTING PROCEDURES..................................................................................... 5-6
TABLE 5. HUMIDITY TROUBLESHOOTING PROCEDURES (OPTIONAL ATOMIZER)............................................ 5-7
TABLE 6. DRY AIR PURGE TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT) .............................. 5-8
TABLE 7. LN2 SYSTEM TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT).................................. 5-10
TABLE 8. GN2 SYSTEM TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT)................................. 5-10
TABLE 9. FROZEN COIL TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT)................................ 5-11
TABLE 10. HIGH/LOW LIMIT CONTROL TROUBLESHOOTING PROCEDURES ................................................... 5-11
CHAPTER 6
WARRANTY & SHIPPING INFORMATION
HOW TO CONTACT CSZ ........................................................................................................................... 7-1
HOW TO OBTAIN REPLACEMENT PARTS/PARTS ORDERING PROCEDURE..................................... 7-1
STANDARD LIMITED EQUIPMENT WARRANTY

TABLE OF CONTENTS
CHAPTER 9
DRAWINGS
ELECTRICAL SCHEMATIC SYMBOLS
REFRIGERATION SCHEMATIC SYMBOLS
CABINETRY LAYOUT DRAWING (IF REQUIRED)
ELECTRICAL SCHEMATIC (IF REQUIRED)
REFRIGERATION FLOW DIAGRAM (IF REQUIRED)
HUMIDITY FLOW DIAGRAM -WITH OPTIONS (IF REQUIRED)
DRY AIR PURGE FLOW DIAGRAM (IF REQUIRED)
LN2 BOOST FLOW DIAGRAM (IF REQUIRED)
GN2 PURGE DIAGRAM (IF REQUIRED)
CHAPTER 7
SPECIFIC INFORMATION
CHAPTER 8
PARTS LISTS
CALIBRATION REPORTS
ELECTRICAL BILL OF MATERIALS (IF REQUIRED)
REFRIGERATION BILL OF MATERIALS (IF REQUIRED)
HUMIDITY BILL OF MATERIALS (IF REQUIRED)
DRY AIR PURGE BILL OF MATERIALS (IF REQUIRED)
LN2 BOOST BILL OF MATERIALS (IF REQUIRED)
GN2 PURGE BILL OF MATERIALS (IF REQUIRED)
THESE CHAPTERS INCLUDED FOR PRINT MANUALS

SAFETY - PRECAUTIONS AND FEATURES Page 1-1
NOTE
INTRODUCTION
Warnings contained in this manual are identified by this symbol. Warnings identify any
conditions or practices that, if not strictly observed, could result in personal injury or
possible loss of life.
Cautions in this manual are identified by this symbol. Cautions identify any condition
or practice that, if not strictly observed, could result in damage to, or destruction of, the
system equipment. Please read all precautions before operating your unit.
Notes contained in this manual are identified by this symbol. Notes identify items of
importance to proper operation and maintenance.
This instrument has been designed and tested in accordance with IEC Publication
61010-1:2010. Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use and has been supplied in a safe condition. The instruction
documentation contains information and warnings which must be followed by the user
to ensure safe operation and to maintain the instrument in a safe condition.
GENERAL SAFETY PRECAUTIONS
The following are general safety precautions that are not related to any specific
procedures and therefore do not appear elsewhere in this manual. These are
recommended precautions that must be understood and applied during many phases
of operation and maintenance of the equipment.
IMPORTANT: All OSHA and other applicable local and national codes, regulations,
and guidelines regarding lockout/tagout procedures must be followed. This includes a
lockable disconnect switch.
KEEP AWAY FROM LIVE CIRCUITS
Operating personnel should at all times observe all safety precautions. Do not replace
components or make adjustments inside the equipment with the high voltage supply
turned on. Under certain conditions, dangerous potentials may still exist when the
power switch is in the off position due to charges retained by capacitors. To avoid
injury, always remove power and discharge and ground a circuit before touching it.
NOTE: Keep unit away from flammable substances.
DO NOT SERVICE OR ADJUST ALONE
No one should reach into an enclosure to service or adjust equipment except in the
presence of someone who is capable of rendering aid.
RESUSCITATION
Personnel working with or near high voltages should be familiar with modern methods
of resuscitation. Such information may be obtained from the Local Red Cross Agency
or other qualified national safety organizations.
CAUTION
!
WARNING
!

SAFETY - PRECAUTIONS AND FEATURES
Page 1-2
DO NOT replace components or make adjustments inside the equipment with the main
power supply turned on. Under certain conditions, dangerous potentials may still exist
when the power switch is in the off position due to charges retained by capacitors. To
avoid injury, always remove power and ground a circuit before touching it.
WARNING
!
Paint thinners, cleaning solutions and other chemicals or solvents should never be stored
in the vicinity of the unit. High operating temperatures and live electrical circuits could
ignite fumes and cause an explosion.
WARNING
!
Do NOT climb or place top heavy objects on the top of the chamber.
WARNING
!
DO NOT reach into an enclosure to service or adjust equipment except in the presence of
someone who is capable of rendering aid.
WARNING
!
All OSHA and other applicable local and national codes, regulations, and guidelines
regarding lockout/tagout procedures must be followed while servicing this unit. This may
include a lockable disconnect switch to remove power from the equipment while servicing.
WARNING
!
PRODUCT PROTECTION. Chambers are equipped with high heat limits or safety
devices. These safety devices are installed to protect the chamber 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 on
test and the chamber in the event of an over-temperature protection.
WARNING
!
DO NOT place items in the chamber that could burn or explode at high temperatures. This
chamber uses open wire heating elements which generate surface temperatures over
1000ºF (537°C). This is NOT an explosion-proof chamber.
WARNING
!
Gaseous nitrogen/CO2 vent connection must be ducted to the outdoors to prevent
displacement of oxygen around the unit.
WARNING
!
The refrigeration unit is a pressurized system and hazards exist which could result in
personal injury. It is therefore recommended that removal and installation of the hermetic
compressor be performed by experienced personnel only. Failure to follow these
instructions may result in serious personal injury.
WARNING
!
This chamber operates at extreme temperatures. Avoid any personal contact with objects
and surfaces that may be hot or cold to prevent severe burns or frostbite.
WARNING
!
The chamber door must remain closed during operation. If the door is required to be open,
wear safety goggles to prevent the high velocity airflow from blowing particles or objects
into your eyes.
WARNING
!
Lock-out main power prior to securing. High voltage remains present on main electrical
panel with covers removed.
WARNING
!
DO NOT touch refrigeration piping during chamber operation. The refrigeration piping can
become very hot or extremely cold, and cause severe burns.
WARNING
!
GENERAL SAFETY PRECAUTIONS (CONTINUED)

SAFETY - PRECAUTIONS AND FEATURES Page 1-3
GENERAL SAFETY PRECAUTIONS (CONTINUED)
All loads must be removed from the chamber prior to transport and/or maintenance and
securing. The chamber door must be shut prior to transport or moving.
WARNING
!
The installation manual and all notes on the electrical schematic must be followed to
ensure safe installation, operation and maintenance.
WARNING
!
Window frame may become hot during operation.
WARNING
!
Prior to servicing the equipment, the supply power should be disconnected by moving
the main disconnect switch to the OFF (O) position. Failure to do so can result in service
personnel being exposed to accessible hazardous voltages. Follow all local, national,
lockout and tagout procedures.
WARNING
!
For continued protection against fire hazard, qualified service personnel must replace
fuses and circuit breakers with the same type and rating only. The use of other fuses and
circuit breakers is prohibited. Disconnect chamber from electrical supply before changing
fuses or resetting circuit breakers.
WARNING
!
If this instrument is not used as specified, the protection provided by the equipment could
be impaired. This instrument must only be used in a normal condition (in which all means
of protection are intact).
WARNING
!
Do not position the instrument such that access to the disconnect device is impaired or
that any of the chamber vents are blocked.
WARNING
!
This product requires a protective earth conductor connection. Any interruption of the
protective conductor inside or outside of the instrument is likely to make the instrument
dangerous. Intentional interruption is prohibited.
WARNING
!
No operator serviceable parts inside equipment. Refer all servicing to qualified service
personnel. To prevent electric shock, do not open lower enclosure panels.
WARNING
!
There are NO provisions for venting fumes.
WARNING
!
CAUTION
!DO NOT put corrosive substances into the chamber. Examples of corrosive substances
include, but are not limited to, Chlorine, Chlorides, and Acids.
CAUTION
!Before switching on this equipment, ensure the supply voltage is correct.
CAUTION
!Running Temperature/Humidity points outside of the standard range can cause damage to
the refrigeration compressor(s).
CAUTION
!To prevent damage to your test samples and the chamber's compressors, DO NOT
exceed the live load rating of the chamber. (See the General Description Section of this
manual for the Live Load rating for your unit.)
CAUTION
!DO NOT place items in the chamber which can emit corrosive vapors or substances.

SAFETY - PRECAUTIONS AND FEATURES
Page 1-4
ELECTROSTATIC DISCHARGE
SENSITIVE DEVICES
This manual contains maintenance procedures for parts and assemblies sensitive to
damage by electrostatic discharge (ESD). Parts or assemblies are identified as ESD
sensitive by the symbol to the left.
The following are general precautions that should be observed when handling ESD
sensitive devices or assemblies:
1. Handling ESD sensitive devices at approved field force protective work stations.
2. Keep work area free of static generators, such as plastic cups, foam cushions, and
rayon or polyester apparel.
3. Avoid static-producing activities, such as wiping feet and removing or putting on
smocks while in the work area.
4. Use ESD protective equipment, such as grounded work benches, grounded tools
and test equipment, conductive flooring, air ionizers, personnel ground straps with 1
megohm minimum resistance, and protective apparel whenever possible.
5. Store and transport ESD sensitive devices in protective bags, tote boxes, or trays.
Use original packaging whenever possible.
6. Remove power and signals before removing or installing ESD sensitive devices or
assemblies.
7. Handle ESD sensitive circuit card assemblies by their shunt bars or edges. Do not
touch parts, terminals, or circuitry. Do not use canned coolant for fault isolation.

SAFETY - PRECAUTIONS AND FEATURES Page 1-5
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 pass 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.
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
personel.
WARNING
!
Cincinnati Sub-Zero
chambers are equipped
with high heat limits, or
safety devices. These
safety devices are installed
to protect the chamber
from exceeding design
limits. These safety devices
remove power ONLY from
the chamber heaters and
DO NOT remove power from
your product. Provisions
mustbemadetode-energize
the product under test and
the chamber in the event
of an over-temperature
condition.
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.
WARNING
!

SAFETY - PRECAUTIONS AND FEATURES
Page 1-6
CONNECTION
FOR EVENT RELAY
Figure 1. Communication Plates
COMMUNICATION
CONNECTIONS
Connection for event relay(s). Do not connect 115
volt power to these connections. Customer events
should only be connected to a 24VDC/AC source.
See EZT-570S User Manual for exact specifications.
NOTE
Note: CSZ is continuously upgrading the components used
in its equipment. Consequently, the physical appearance of
certain components may vary from that shown.

GENERAL DESCRIPTION Page 2-1
SYSTEM DESCRIPTION
The ZP-Series Temperature chambers are pre-engineered chambers designed to provide
an environment with specific temperature (humidity) conditions. The standard ZP model is
composed of the following: 1. Controller, 2. Chamber, 3. Refrigeration/ Heating components.
Optional equipment includes, but is not limited to: 4. Humidity, 5. Pen Recorders, 6. High/
Low Limit, 7. IEEE-488 Serial Interface, 8. Boost Cooling System, 9. GN2 Purge, 10. Dry
Air Purge, 11. Limited Temperature Sheath Heaters.
The chambers have a standard range of -94ºF to +375ºF (-70ºC to +190ºC) cascade,
-50°F to +375°F(-45°C to +190°C) Tundra, and -30ºF to +375ºF (-34ºC to +190ºC) single
stage which provide both heating and cooling as required. Chambers with optional humidity
are designed to provide a minimum of 10% and a maximum of 98% relative humidity, as
limited by a 45ºF (7ºC) dewpoint and a 185ºF (85ºC) maximum dry bulb temperature. Refer
to Figure 2 for Achievable Humidity Points. The chambers are designed to operate in a
commercial environment, i.e. temperature of +75°F +/- 10°F (+23°C +/- 6°C), maximum dew
point of 55°F (12.8°C), and an altitude of 7,000 ft. (2133.6M). Refer to the specifications at
the end of this section for additional information.
CONTROLLER
The standard controller is composed of a CSZ EZT-570S Controller, a High/Low limit, and
communications electronics. Detailed operating instructions for the controller are found in
the controller user’s manuals on the digital media that accompanied the chamber. Other
optional controllers available include the Watlow F4. See Operating Instructions in Chapter
4 for more information regarding chamber controllers.
CHAMBER
A. Chamber Interior
The chamber interior consists of the front workspace and the rear component
area, separated by a stainless steel plenum cover. A probe bracket is behind the
grille in the upper left corner of the plenum. The bracket contains the probes for
the controller, recorder (if required), and RH sensor (if humidity option is installed).
The area behind the plenum cover contains the refrigeration evaporator coil,
heater limit thermocouple, evaporator fan(s), humidification inlet (if humidity option
is installed), auxiliary cooling nozzle (if auxiliary cooling option is installed), and
the dehumidification coil (if humidity option is installed). These items may only be
accessed by removal of the plenum cover by properly trained service personnel.
B. Chamber Exterior
Fiberglass insulation is used with a high temperature binder for temperatures up to
500ºF (260ºC). The cabinet is constructed with a minimum of mechanical contact
between the liner and the exterior to reduce conductive heat losses and minimize
condensation on the exterior cabinet.
A multiple-pane window assembly in the door of the chamber allows viewing of the
chamber interior during operation. The window is constructed of tempered glass
panes with a heater harness to assure frost-free viewing during low temperature
chamber operation. Under certain ambient conditions, it may be normal to see
some condensation around the outer window frame are a during low temperature
operation.
Condensation on
exterior surfaces is
normal when operating
at cold temperatures
for an extended period
of time.
NOTE
!

GENERAL DESCRIPTION
Page 2-2
REFRIGERATION/HEATING COMPONENTS
A. Refrigeration
ZP-Series chambers use one of three types of mechanical refrigeration systems. Single stage,
Tundra®, and cascade. A single stage system is used when the chamber’s ultimate low temperature
is -30ºF (-34ºC) or higher. The Tundra system is used when the chambers ultimate low temperature
is -50°F (-45°C) or higher. A cascade system is used when the chamber’s ultimate low temperature
is -94ºF (-70ºC). The single stage system uses refrigerant R-404A. The cascade system uses
refrigerant R-404A in System #1 and R-508B/R-23 in System #2. The Tundra System uses refrigerant
R-410A.
The refrigeration system can either be air cooled or water cooled depending on the model of chamber.
Standard ZP-Series chambers are air cooled except up to 3.5HP.
Chambers with compressors which are 10 HP (having nominally approx. 12kW of capacity with
R-404A refrigerant at 60 Hz operation) and larger are water cooled.
All refrigeration components are selected to ensure safe, reliable, and balanced operation. The
components may be purchased from the CSZ Service Department or a local refrigeration wholesaler.
B. Heating
Open-coil nichrome heating elements are standard on all systems. The heaters are mounted in
porcelain insulators attached to stainless steel frames. The heaters are located behind the rear
plenum and do not radiate directly into the test space.
Limited temperature sheath heaters are an option for chambers that may contain flammable vapors.
See the last section of this chapter for more information.

GENERAL DESCRIPTION Page 2-3
Upper
Refrigeration
Components
(Located behind
access panel)
Water Cooled
Condenser Connections
(If Applicable)
Water Inlet
Location
Electrical Connection
(1 1/4” EMT Conduit - 35mm
Metric Conduit Trade Size)
LN2 Boost Valves
(Optional)
LN2 Vent
(Must be vented to outdoors)
Dry Air Purge
(Optional)
Steam
Generator
System
Lower Refrigeration Components
Figure 1. Chamber Components Location
Note: CSZ is continuously upgrading the components used
in its equipment. Consequently, the physical appearance of
certain components may vary from that shown.

GENERAL DESCRIPTION
Page 2-4
Blower Motor
Adjustable
Supply Air
Damper
Supply Air
Return Air
Note: CSZ is continuously upgrading
the components used in its equipment.
Consequently, physical appearance of
certain components may vary from that
shown. Figure 3. ZPRC Chamber - Top View
Figure 2. ZPRC Chamber - Side View