Julabo SC 2500w User manual

Operating Manual
SemiChill Recirculating Coolers
Professional Series
SC2500a
air cooled
SC2500w
water cooled
1.950.4571.us.V10 01/22
JULABO USA, Inc.
884 Marcon Boulevard
Allentown, PA 18109
Phone: [phone]
Fax: [phone]
[e-mail]
www.julabo.us
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SC 2500
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Congratulations!
You have made an excellent choice.
JULABO thanks you for the trust you have placed in us.
This operating manual has been designed to help you gain an understanding of the operation and
possible applications of our circulators. For optimal utilization of all functions, we recommend that you
thoroughly study this manual prior to beginning operation.
Unpacking and inspecting
Unpack the circulator and accessories and inspect them for possible transport damage. Damage
should be reported to the responsible carrier, railway, or postal authority, and a damage report should
be requested. These instructions must be followed fully for us to guarantee our full support of your
claim for protecting against loss from concealed damage. The form required for filing such a claim will
be provided by the carrier.
Important: keep original operating manual for future use

Recirculating Cooler
3
TABLE OF CONTENTS
1. Intended use................................................................................................................. 5
1.1. Description ............................................................................................................... 5
2. Operator responsibility – Safety instructions ................................................................. 6
2.1. Disposal ................................................................................................................... 8
2.2. Technical specifications ........................................................................................... 9
2.3. Cooling water connection ....................................................................................... 12
3. Operating controls and functional elements ................................................................ 13
4. Safety notes for the user............................................................................................. 16
4.1. Explanation of safety notes .................................................................................... 16
4.2. Explanation of other notes...................................................................................... 16
4.3. Safety instructions.................................................................................................. 16
5. Preparations ............................................................................................................... 18
5.1. Installation.............................................................................................................. 18
5.2. Connecting the external system ............................................................................. 19
5.2.1.Tubing ............................................................................................................... 20
5.2.2.Bath fluids.......................................................................................................... 20
5.3. Filling ..................................................................................................................... 21
5.4. Draining ................................................................................................................. 22
6. Operating procedures ................................................................................................. 23
6.1. Power connection................................................................................................... 23
6.2. Switching on / Start - Stop...................................................................................... 23
7. Setting the temperatures ............................................................................................ 24
8. Safety installations, warning functions ........................................................................ 25
8.1. Excess temperature protection............................................................................... 25
8.1.1.Early warning system, low level protection......................................................... 26
8.2. Over and Sub temperature warning functions ........................................................ 27
8.2.1.Change-over of the warning function to shutdown function ................................ 28
9. Menu functions ........................................................................................................... 29
9.1. MENU PUMP - Setting the pump pressure............................................................. 30
9.2. MENU CONTROL – Control parameters................................................................ 31
9.2.1.CONTROL – internal / external control .............................................................. 31
9.2.2.SELFTUNING.................................................................................................... 33
9.2.3.DYN INT - Dynamic internal............................................................................... 34
9.2.4.Control parameters – XP, TN, TV internal.......................................................... 34
9.2.5.COSPEED - external ......................................................................................... 36

4
9.2.6.Control parameters – XPU, XP, TN, TV external ................................................37
9.3. MENU CONFIG - configuration ...............................................................................37
9.3.1.SETPOINT – Keypad control or remote control ..................................................38
9.3.2.A-START – Autostart..........................................................................................39
9.3.3.OFF-MODE – Pump motor on / off .....................................................................40
9.3.4.RESET – Factory settings ..................................................................................40
9.3.5.ACTVAR - actuating variable ..............................................................................41
9.3.6.TIME / DATE – setting time and date..................................................................42
9.4. MENU SERIAL - BAUDRATE, HANDSHAKE, PARITY...........................................43
9.5. MENU LIMITS.........................................................................................................44
9.6. MENU PROGRAM – Integrated programmer ..........................................................46
9.7. MENU ADJUST – ATC Absolute Temperature Calibration......................................50
9.8. MENU ANALOG – Analog inputs/outputs................................................................54
10. Troubleshooting guide / Error messages .....................................................................61
11. Electrical connections ..................................................................................................63
12. Remote control ............................................................................................................65
12.1. Setup for remote control..........................................................................................65
12.2. Communication with a PC or a superordinated data system ...................................65
12.3. List of commands....................................................................................................66
12.4. Status messages ....................................................................................................70
12.5. Error messages.......................................................................................................70
13. JULABO Service – Online remote diagnosis................................................................71
14. Cleaning / repairing the unit.........................................................................................72
15. WARRANTY PROVISIONS .........................................................................................73

Recirculating Cooler
5
1. Intended use
JULABO recirculating coolers have been designed to control the temperature of specific fluids in a
bath tank. The units feature pump connections for temperature control of external systems (loop
circuit).
JULABO recirculating coolers are not suitable for direct temperature control of foods,
semi-luxury foods and tobacco, or pharmaceutical and medical products. Direct
temperature control means unprotected contact of the object with the bath medium
(bath fluid).
1.1. Description
TCF
ATC
3
RS232
Pt100
The recirculating coolers are operated via the splash-proof keypad. The
implemented microprocessor technology allows to set and to store different values
that can be indicated on the VFD COMFORT-DISPLAY. Three menu keys facilitate
adjusting setpoints, warning and safety functions and menu functions.
The integrated programmer allows storing and running temperature and time-
dependent processes.
“ICC - Intelligent Cascade Control“ represents the supreme solution temperature
control. ICC overs perfect temperature control with self-optimizing PID control
parameters.
The TCF -Temperature Control Features allow the user to have access to all
important temperature control parameters. This means: Full control on the control
mode and the chance to manually adjust or adapt control to the specific application.
Absolute Temperature Calibration (ATC3) provides a high temperature stability in
the bath. With the 3-point calibration an offset is adjusted at three temperatures to
ensure an accurate temperature pattern at the selected spot in the bath over the
full temperature range.
Electrical connections:
The serial interface, switchable from RS232 to RS485, allows modern process
technology without additional interface.
Connection for Pt100 external sensor for external temperature measurement and
control.
The electronic module (option) provides 3 further analog connections (alarm input,
standby input, recorder output, programmer input).
The excess temperature protection conforming to IEC 61010-2-010 is a safety
installation independent from the control circuit. This protection can be indicated
and set on the VFD COMFORT-DISPLAY.
The early warning system for low level signals that bath fluid needs to be refilled
before the low level protection conforming to IEC 61010-2-010 causes a complete
shutdown of the main functional elements.
Intelligent pump system: The pump capacity (electronically adjustable via the motor
speed) enables to adapt to varying conditions for internal and external temperature
applications.
1x10
ICC
PUMP
SMART

Operator responsibility – Safety instructions
6
2. Operator responsibility – Safety instructions
The products of JULABO ensure safe operation when installed, operated, and maintained according to
common safety regulations. This section explains the potential dangers that may arise when operating
the circulator and also specifies the most important safety precautions to preclude these dangers as far
as possible.
The operator is responsible for the qualification of the personnel operating the units.
The personnel operating the units should be regularly instructed about the dangers involved with
their job activities as well as measures to avert these dangers.
Make sure all persons tasked with operating, installing, and maintaining the unit have read and
understand the safety information and operating instructions.
When using hazardous materials or materials that could become hazardous, the circulator may be
operated only by persons who are absolutely familiar with these materials and the circulator. These
persons must be fully aware of possible risks.
If you have any questions concerning the operation of your unit or the information in this manual,
please contact us!
Contact JULABO USA, Inc.
884 Marcon Boulevard
Allentown, PA 18109
Phone: [phone]
Fax: [phone]
[e-mail]
www.julabo.us
Safety instructions for the operator:
Avoid strikes to the housing, vibrations, damage to the operating-element panel (keypad, display),
and contamination.
Make sure the product is checked for proper condition regularly (depending on the conditions of
use). Regularly check (at least every 2 years) the proper condition of the mandatory, warning,
prohibition and safety labels.
Make sure that the mains power supply has low impedance to avoid any negative effects on the
instruments being operated on the same mains.
This unit is designed for operation in a controlled electromagnetic environment. This means that
transmitting devices (e.g., cellular phones) should not be used in the immediate vicinity.
Magnetic radiation may affect other devices with components sensitive to magnetic fields (e.g.,
monitors). We recommend maintaining a minimum distance of 1 m.
Permissible ambient temperature: max. 40 °C, min. 5 °C.
Permissible relative humidity: 50% (40 °C).
Do not store the unit in an aggressive atmosphere. Protect the unit from contamination.
Do not expose the unit to sunlight.

Recirculating Cooler
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Appropriate operation
Only qualified personnel is authorized to configure, install, maintain, or repair the circulator.
Persons who operate the circulator must be trained in the particular tasks by qualified personnel. The
summarized user guidance (short manual) and the specification table with information on individual
parameters are sufficient for this.
Use
The bath can be filled with flammable materials. Fire hazard!
There might be chemical dangers depending on the bath medium used.
Observe all warnings for the used materials (bath fluids) and the respective instructions (safety data
sheets).
Insufficient ventilation may result in the formation of explosive mixtures. Only use the unit in well
ventilated areas.
Only use recommended materials (bath fluids). Only use non-acid and non corroding materials.
When using hazardous materials or materials that could become hazardous, the operator must affix
the enclosed safety labels to the front of the unit so they are highly visible:
If this unit is intended for use within the United States of America, all 3 warning labels must be affixed
to the housing of the unit prior to use. Directions for the positioning of the individual warning labels are
enclosed with the warning labels included in the delivery.Warning labels must be easily visible to
users.
1
Danger area. Attention! Observe instructions.
(operating manual, safety data sheet)
2
or
Carefully read the user information prior to beginning operation.
Scope: EU
2 Carefully read the user information prior to beginning operation.
Scope: USA, NAFTA
Particular care and attention is necessary because of the wide operating range.
There are thermal dangers: Burn, scald, hot steam, hot parts and surfaces that can be touched.
Hot surface warning.
(The label is put on by JULABO)
Observe the instructions in the manuals for instruments of a different make that you connect to the
circulator, particularly the corresponding safety instructions. Also observe the pin assignment of plugs
and technical specifications of the products.

Operator responsibility – Safety instructions
8
2.1. Disposal
The recirculating cooler contains a back-up battery that supplies voltage to the memory chips when
the unit is switched off. Do not dispose of the battery with household waste!
Depending on battery regulations in your country, you may be obligated to return used or defective
batteries to collection sites.
The product may be used with oil as bath fluid. These oils fully or partially consist of mineral oil or
synthetic oil. For disposal, follow the instructions in the material safety data sheets.
This unit contains the refrigerant R452A, which at this time is not considered harmful to the ozone
layer. However, over the long operating period of the unit, disposal rules may change. Therefore, only
qualified personnel should handle the disposal.

Recirculating Cooler
9
2.2. Technical specifications
Performance specifications measured in accordance with DIN12876. Cooling capacities up to 20°C
measured with ethanol; over 20°C with thermal oil unless specified otherwise. Performance
specifications apply at an ambient temperature of 20°C. Performance values may differ with other bath
fluids.
Professional Series SC 2500a SC 2500w
Working temperature ranges:
Standard unit °C +5 ... +35 +5 ... +35
Option Low Temp °C -20 ... +35 -20 ... +35
Option Low /HighTemp I °C -20 ... +80 -20 ... +80
Temperature stability °C 0.1 0.1
Absolute Temperature Calibration INT/EXT ±3 / ±9 ±3 / ±9
Heater wattage (at 230 V) Option H1 kW 1.0 1.0
Cooling capacity °C +20 0 -10 +20 0 -10
kW 2.5 1.5 0.9
2.5 1.5 0.9
Refrigerant R452A R452A
Pump capacity P3
see table 1 page 10
Flow rate P3 l/min at 0 bar 33 33
Pressure max. P3 bar at 0 liters 3.5 3.5
Overall dimensions (WxDxH) cm 49x62/105 49x62/105
Filling volume liters 21 ... 33 21 ... 33
Weight kg 123 123
Mains power connection V/Hz 230 / 50 230 / 50
Current consumption without heater A 11 (at 230 V) 11 (at 230 V)
Current consumption 1 kW heater A 15 (at 230 V) 15 (at 230 V)
Mains power connection V/Hz 208-230 / 60 208-230 / 60
Current consumption without heater A 11 (at 230 V) 11 (at 230 V)
Current consumption 1 kW heater A 15 (at 230 V) 15 (at 230 V)
* Pump P3- reduces cooling capacity by 0.3 kW

Operator responsibility – Safety instructions
10
Professional series
Temperature selection digital
via keypad indication on VFD COMFORT-DISPLAY
remote control via personal computer indication on monitor
Temperature indication °C VFD COMFORT-DISPLAY
Resolution °C 0.1
Temperature control ICC - Intelligent Cascade Control
Electrical connections:
Computer interface RS232
External Pt100 sensor
Optional
Programmer input -100 °C to 400 °C = 0 - 10 V or 0 - 20 mA or 4 - 20 mA
Input for the signal of a flow meter or external manipulated variable
Temperature recorder outputs 0 - 10 V (0 V = -100 °C, 10 V = 400 °C)
0 - 20 mA (0 mA = -100 °C, 20 mA = 400 °C)
4 - 20 mA (4 mA = -100 °C, 20 mA = 400 °C)
Standby input for external emergency switch-off
Alarm output for external alarm signal
Table 1
Pump capacity
Bath fluid: Water, Silicone -oil
XX.XX
PUMP
1
XX.XX
PUMP
2
Circulating pump:
P3 P3
Flow rate max. Lpm at 0 bar
30 33
Pressure max. bar at 0 liter
1.8 3.5
Bath fluid: Galden®
eg. Fluorinert
®
3283
Pressure max. bar at 0 liter 3.5
Notice:
If Galden®or Fluorinert®is used the the charge of the motor increases. Wrong
adjustment causes overheating and eventually destruction of the motor.
•With the circulation pump P3 a maximum pump pressure stage >PUMP 1< may
be adjusted..
The pump type can be recognized in the order no. on the name plate.
95 xx xxx _ xx PX xx

Recirculating Cooler
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Safety installations according to IEC 61010-2-010:
Excess temperature protection adjustable from 0 °C ... 220 °C
Low liquid level protection float switch
Classification according to DIN 12876-1 class III
Supplementary safety installations
Early warning system for low level float switch
High temperature warning function optical + audible (in intervals)
Low temperature warning function optical + audible (in intervals)
Supervision of working sensor plausibility control
Reciprocal sensor monitoring between
working and safety sensors difference >35 K
Alarm message optical + audible (permanent)
Warning message optical + audible (in intervals)
Environmental conditions according to IEC 61 010-1:
Use indoors only.
Altitude up to 2000 m - normal zero.
Ambient temperature: see Technical specifications
Humidity:
Max. relative humidity 80% for temperatures up to +31 °C,
linear decrease down to 50% relative humidity at a temperature of +40 °C
Max. mains voltage fluctuations of ±10% are permissible.
Protection class according to IEC 60 529 IP21
The unit corresponds to Class I
Overvoltage category II
Pollution degree 2
Caution:
The unit is not for use in explosive environment.
EMC requirements
The device is an ISM device of group 1 per CISPR 11 (uses HF for internal purposes) and is classified
in class A (industrial and commercial sector).
Notice:
• Devices of class A are intended for the use in an industrial electromagnetic
environment.
• When operating in other electromagnetic environments, their electromagnetic
compatibility may be impacted.

Operator responsibility – Safety instructions
12
2.3. Cooling water connection
Cooling water pressure (IN/OUT) max. 6 bar
Pressure difference (IN - OUT) 3.5 to 6 bar
Cooling water consumption (IN with 15 °C) 5 l/min
Cooling water temperature < 20 °C
Notice: Cooling water circuit
Risk of oil leaking from the refrigeration system (compressor) of the recirculating
cooler into the cooling water in case of a fault in the cooling water circuit!
Observe the laws and regulations of the water distribution company valid in the location
where the unit is operated.
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of cooling
water.
•Due to its high content of lime, hard water is not suitable for cooling and causes
scale in the heat exchanger.
•Ferrous water or water containing ferrous particles will cause formation of rust
even in heat exchangers made of stainless steel.
•Chlorinated water will cause pitting corrosion in heat exchangers made of
stainless steel.
•Due to their corrosive characteristics, distilled water and deionized water are
unsuitable and will cause corrosion of the bath.
•Due to its corrosive characteristics, sea water is not suitable.
•Due to its microbiological (bacterial) components, which settle in the heat
exchanger, untreated and unpurified river water and water from cooling towers
is unsuitable.
•Avoid particulate matter in cooling water.
•Avoid putrid water.
Recommended quality of cooling water:
pH
7.5 to 9.0
Sulfate [SO4 2- ]
< 100 ppm
Hydrocarbonate [HCO 3-]/sulfate [SO4 2-]
> 1 ppm
Hardness [Ca 2+, Mg 2+]/[HCO 3-]
> 0.5 °dH
Alkalinity
60 ppm < [HCO 3-] < 300 ppm
Conductivity
< 500 μS/cm
Chloride (Cl -)
< 50 ppm
Phosphate (PO4 3-)
< 2 ppm
Ammonia (NH3)
< 0.5 ppm
Free chlorine
< 0.5 ppm
Trivalent iron ions (Fe 3+)
< 0.5 ppm
Manganese ions (Mn 2+)
< 0.05 ppm
Carbon dioxide (CO2)
< 10 ppm
Hydrogen sulfide (H2S)
< 50 ppm
Content of oxygen
< 0.1 ppm
Algae growth
impermissible
Suspended solids
impermissible

Recirculating Cooler
13
3. Operating controls and functional elements
Front view Rear view
1
Mains power switch
2
Emergency stop switch
3
Adjustable excess temperature protection according to IEC 61010-2-010
4
Keypad
Start / stop key
Key for selecting the working temperature - Setpoint 1, 2, 3
Key for selecting the warning and safety values
MENU button - for selecting the menu functions
Cursor keys (left or right)
Edit keys (increase or decrease)
Enter key 1) Store value / parameter
2) Next lower menu level
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SC 2500
°C
10
30
60
130
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3
4
5
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7
8
9
10
12 16
21
22
23
24
25
26
20
19
°C
10
30
60
130
180
220

Operating controls and functional elements
14
Escape key 1. Cancel entries
2. Return to a higher menu level
5
XXXXX
S xxxxx
FL GOOD
XXXXX
S xxxxx
R 005
VFD COMFORT-DISPLAY
Header: Control indicators see sections 2.1 and 2.2
Line 1: Actual value internal or external
The display is depending on the selected control mode in the
menu > Control < (internal or external).
Line 2: Working temp. setpoint, constantly S xxx.xx
Line 3: Actual value (E = external or I = internal)
Alternating with the display in line 1
Use the keys to indicate further values in line 3. However, the
functions of these keys are different with the programmer started.
PI Capacity in % - with manipulated variable set to >control<*
or
PS Capacity in % - with manipulated variable set to >SERIAL<* or
>EPROG<*
F Flow rate in liters/minute
(providing EPROG input set to >FLOWRATE<)
*see 9.3.5. ACTVAR - page 41
FL Status indication for flow >GOOD< = Pump switched on
R Resistifity measurement and actual value display in the range from
0.5 ... 5 MOhm/cm
Press to return to actual value (E = external or I = internal)
5.1
Control indicators in the header:
Heating / Cooling / Alarm /
R
emote control
5.2
Control indicators in the header:
Temperature indication Internal or External actual value
Temperature indication in °C (°F not possible on this unit)
5.3
6
Filling level indication
7
Manometer (feed pressure)
8
Handle
9
Filling opening
10
Venting grid, removable
(only air cooled recirculating cooler)

Recirculating Cooler
15
Rear view
12
RS232
Interface RS232: remote control via personal computer
Option: Electronic module
13
ALARM
Alarm output (for external alarm signal)
14
STAND-BY
Standby input (for external emergency switch-off)
15
REG+E-PROG
Programmer input and temperature recorder output
16
ext Pt100
Socket for external measurement and control sensor
or external setpoint programming
19
2 Connectors for solenoid valve. 230 V / max. 0.1 A
No control voltage in the -OFF- condition
20 2 Safety cutouts: Mains fuses 16 A
0
1
Motor protection circuit breaker for compressor motor
21
Mains power cable with plug
22
23
Pump connectors: 3/4” NPT male
OUT / Feed IN / Return
24
Overflow connector, M10x1 female
Order-No. 8 970 460 Barbed fitting for tubing 8 mm inner dia.
 Closable when using e.g. 3M Fluorinert ®as temperature liquid.
25
Discharge nozzle with cap nut, Connection: ½ " male
Recommendation:
Before filling please install a drain cock at the discharge nozzle.
(not included in delivery)
Order-No. 8 920 100 Drain cock, stainless steel
26 Only for water cooled models: Cooling water OUTLET and INLET
OUT
IN

Safety notes for the user
16
4. Safety notes for the user
4.1. Explanation of safety notes
In addition to the safety warnings listed above, warnings are posted throughout the
manual. These warnings are designated by an exclamation mark inside an equilateral
triangle. “Warning of a dangerous situation (Attention! Please follow the
documentation).”
The danger is classified using a signal word.
Read and follow these important instructions.
Warning:
Describes a possibly highly dangerous situation. If these instructions are not followed,
serious injury and danger to life could result.
Caution:
Describes a possibly dangerous situation. If this is not avoided, slight or minor injuries
could result. A warning of possible property damage may also be contained in the text.
Notice:
Describes a possibly harmful situation. If this is not avoided, the product or anything in
its surroundings can be damaged.
4.2. Explanation of other notes
Note!
Draws attention to something special.
Important!
Indicates usage tips and other useful information.
4.3. Safety instructions
Follow the safety instructions to avoid personal injury and property damage. Also, the
valid safety instructions for workplaces must be followed.
•Only connect the unit to a power socket with an earthing contact (PE – protective
earth)!
•The power supply plug serves as a safe disconnecting device from the line and
must always be easily accessible.
•Place the unit on an even surface on a base made of nonflammable material.
•Do not stay in the area below the unit.
•Make sure you read and understand all instructions and safety precautions listed
in this manual before installing or operating your unit.
•Set the excess temperature safety installation at least below the flash point of the
bath fluid.
•Never operate the unit without bath fluid in the bath.
•Pay attention to the thermal expansion of bath oil during heating to avoid
overflowing of the fluid.
•Prevent water from entering the hot bath oil.

Recirculating Cooler
17
•Do not drain the bath fluid while it is hot!
Check the temperature of the bath fluid prior to draining (e.g., by switching the unit
on for a short moment).
•Use suitable connecting tubing.
•Avoid sharp bends in the tubing, and maintain a sufficient distance from
surrounding walls.
•Make sure that the tubing is securely attached.
•Regularly check the tubing for material defects (e.g., for cracks).
•Never operate damaged or leaking units.
•Always turn off the unit and disconnect the mains cable from the power source
before performing any service or maintenance procedures, or before moving the
unit.
•Always turn off the unit and disconnect the mains cable from the power source
before cleaning the unit.
•Always empty the bath before moving the unit.
•Transport the unit with care.
•Sudden jolts or drops may cause damage in the interior of the unit.
•Observe all warning labels.
•Never remove warning labels.
•Never operate units with damaged mains power cables.
•Repairs are to be carried out only by qualified service personnel.
•Some parts of the bath tank and the pump connections may become extremely
hot during continuous operation. Therefore, exercise particular caution when
touching these parts.
Caution:
The unit may be used, for example, to control the temperature of fluids in a reactor.
We do not know what substances are contained in these vessels.
Many substances are:
•inflammable, easily ignited, or explosive
•hazardous to health
•environmentally hazardous
i.e.: dangerous
The user alone is responsible for the handling of these substances!
The following questions should help to recognize possible dangers and to reduce the
risks to a minimum.
•Are all tubes and electrical cables connected and layed?
Note:
sharp edges, hot surfaces in operation, moving machine parts, etc.
•Do dangerous vapors or gases develop during heating?
Must the work be done in a fume hood?
•What to do when a dangerous substance was spilled on or in the unit?
Before starting to work, obtain information concerning the substance and
determine the method of decontamination.

Preparations
18
Notice:
Check the safety installations at least twice a year!
•Excess temperature protection according to IEC 61010-2-010
With a screwdriver, turn back the adjustable excess temperature protection until
the shutdown point (actual temperature).
•Low level protection according to IEC 61010-2-010
To check the function of the float, it can be manually lowered with a screwdriver,
for example.
WARNING
This product contains chemicals known to the state of California to cause cancer,
birth defects or other reproductive harm.
5. Preparations
5.1. Installation
•Place the unit in an upright position.
For better stability, apply the holding brakes on the front casters.
•The place of installation should be large enough and provide
sufficient air ventilation to ensure the room does not warm up
excessively because of the heat the instrument rejects to the
environment. (Max. permissible ambient temperature: 35 °C).
For a fault (leakage) in the refrigeration system, the standard EN
378 prescribes a certain room space to be available for each kg of
refrigerant.
The refrigerant quantity is specified on the type plate.
> For 0.423 kg of refrigerant R452A, 1 m3 of space is required.
•Keep at least 20 cm of open space on the front and rear venting
grids.
•Do not set up the unit in the immediate vicinity of heat sources
and do not expose to sun light
•Before operating the unit after transport, wait about one hour after
installation. This will allow any oil that has accumulated laterally
during transport to flow back down, thus ensuring that the
compressor can develop its maximum capacity.
Recommendation:
Before filling please install a drain cock at the discharge nozzle. (25)
Connection: ½ " male (not included in delivery)
Order-No. 8 920 100 Drain cock, stainless steel
Cooling water connection (26)
Only for water cooled models:
Ensure circulation of cooling water by connecting the tubing to cooling
water inlet and outlet on the rear of the recirculating cooler.
Cooling water connectors G3/4 male
Cooling water temperature < 20 °C
Cooling water see page 12

Recirculating Cooler
19
5.2. Connecting the external system
3/4" NPT male
24
19
•Connect the tubing for cooling the external
system to the pump connectors (22, 23) for
feed and return on the rear of the recirculating
cooler.
•In case the system to be cooled is located at
a higher level than the recirculating cooler,
take note of bath liquid flowing back when the
unit is switched off. Should the filling volume
of the bath tank not be sufficient, prevent the
liquid from flowing back by using shut-off
valves.
Flood hazard!
For this reason, solenoid valves for loop
circuit or shut-off valves can be integrated in
the loop circuit.
•
•Connect the valve to the connector (19).
Order No. Description
8 980 705 Solenoid valve set 230 V/ 50-60 Hz
•Unscrew the collar nut from the overflow connector (24).
Connect a piece of tubing to the overflow connector and drain into
a suitable vessel.
Order-No. 8 970 460 Barbed fitting for tubing 8 mm inner dia.
•If easily volatile temperature liquids are used, as e.g. 3M
Fluorinert ®, the overflow should remain closed.
Attention Flood hazard!
Then the level indication (6) should get more attention.
Caution:
Securely attach all tubing to prevent slipping.

Preparations
20
5.2.1. Tubing
Recommended tubing:
Maximum pressure
Textile-reinforced tubing
> 4.5 bar
Warning: Tubing:
At high working temperatures, the tubing used for temperature control and for the
cooling water supply represents a danger source.
A damaged tubing line may allow a large amount of hot bath fluid to be pumped out
within a short time.
This may result in:
•Burning of skin
•Breathing difficulties due to hot atmosphere
Safety instructions
•Use suitable connecting tubing.
•Make sure that the tubing is securely attached.
•Avoid sharp bends in the tubing and maintain a sufficient distance from
surrounding walls.
•Regularly check the tubing for material defects (e.g., for cracks), at least once a
year.
•Preventive maintenance: replace the tubing from time to time.
5.2.2. Bath fluids
Caution:
Carefully read the material safety data sheet of the bath fluid used, particularly with
regard to the fire point!
If a bath fluid with a fire point of ≤65 °C is used, only supervised operation is
possible.
Water:
The quality of water depends on local conditions.
•Due to the high concentration of lime, hard water is not suitable for temperature
control because it leads to scale in the bath
•Ferrous water can cause corrosion, even on stainless steel.
•Chlorinated water can cause pitting corrosion.
•Distilled water and deionized water are unsuitable. Their special properties
cause corrosion in the bath, even on stainless steel.
Recommended bath fluids: