Julabo FC1200S User manual

19514811-V2.doc 26.07.13
English
Operating
manual
Recirculating coolers
FC1200S FCW1200S
FC1600S FCW1600S
FC1200T FCW1200T
FC1600T FCW1600T
FCW2500T
FC600-T FC1200-T FC1600-T
JULABO GmbH
77960 Seelbach / Germany
Tel. [phone] / 51-0
Fax [phone] / 24 91
[email protected]
www.julabo.de
1.951.4811-V2 06/13

2
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.
The JULABO Quality Management System
Temperature control devices for research and industry are developed,
produced, and distributed according to the requirements of ISO 9001
and ISO 14001. Certificate Registration No. 01 100044846
Unpacking and inspecting
Unpack the recirculating cooler and accessories and check for
damages incurred during transit. These should be reported to the
responsible carrier, railway, or postal authority, and a request for a
damage report should be made. 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.
Printed in Germany Changes without prior notification reserved
Important: keep operating manual for future use

Recirculating coolers
3
Table of Contents
1. Intended use...............................................................................................4
1.1. Description .................................................................................................4
2. Operator responsibility – Safety instructions..............................................4
2.1. Disposal......................................................................................................6
2.2. EC Conformity............................................................................................7
2.3. Warranty conditions....................................................................................7
2.4. Technical specifications..............................................................................8
2.5. Cooling water connection .........................................................................13
3. Safety notes for the user..........................................................................14
3.1. Explanation of safety notes ......................................................................14
3.2. Explanation of other notes........................................................................14
3.3. Safety instructions....................................................................................14
4. Operating controls and functional elements.............................................16
5. Operation..................................................................................................19
5.1. Preparations.............................................................................................19
5.2. Return flow safety device .........................................................................20
5.3. Bath fluids.................................................................................................21
5.4. Tubing ......................................................................................................21
5.5. Power connection.....................................................................................22
5.6. Filling........................................................................................................22
5.7. Draining....................................................................................................23
5.8. Connecting an external sensor.................................................................24
6. Manual operation .....................................................................................25
6.1. Switching on.............................................................................................25
6.2. Start..........................................................................................................25
6.2.1. Automatic / non-automatic start mode..........................................26
6.3. Setting the setpoint temperatures.............................................................27
6.3.1. Setting the temperature................................................................27
6.3.2. Setting the control ratio for feed/return flow temperature.............28
6.3.3. Setting the safety temperatures ...................................................29
6.3.4. Low liquid level protection............................................................29
6.4. PID control parameters.............................................................................30
7. Trouble shooting guide.............................................................................33
7.1. Other error messages...............................................................................34
8. Electrical connections ..............................................................................34
9. Remote control.........................................................................................37
9.1. Communication with a PC or data system................................................37
9.2. List of commands .....................................................................................37
9.3. Status messages......................................................................................39
9.4. Error messages........................................................................................39
10. Menu functions.........................................................................................40
10.1. Selecting/exiting the configuration level....................................................40
10.2. Setting the parameters.............................................................................40
10.3. Adjustable parameters..............................................................................41
10.4. Selecting/exiting the calibration level........................................................42
10.5. Calibration ................................................................................................42
11. Cleaning / repairing the unit.....................................................................45

Intended use
4
1. Intended use
JULABO recirculating coolers have been designed for temperature application to specific
fluids. The pump connections can be used for cooling applications in an external circuit at a
constant temperature.
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
The recirculating cooler consists of
control unit with splash-proof keypad (microprocessor technology)
cooling compressor
heater
heating/cooling bath and recirculating pump
The electronics comprises two microprocessors that provide reciprocal monitoring via
sensors for the working and safety circuit.
The actual and setpoint temperatures are permanently visible on the MULTI-DISPLAY (LED
1 + LED 2) and thus may be easily compared.
The bath tank is located in the lower part of the unit. The cooling machine draws heat from
the bath liquid via the cooling coil (evaporator). If the setpoint lies above the ambient
temperature, the integrated heater produces more heat.
The integrated circulating pump ensures constant conditions for the external cooling loop and
provides a good circulation of the liquid in the bath tank.
The unit provides analog electrical connections and a serial interface.
Safety installations: High temperature and low temperature limits, both adjustable via the
MULTI-DISPLAY, as well as low liquid level protection.
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 recirculating coolers and also specifies the most important safety
precautions to preclude these dangers as far as possible.

Recirculating coolers
5
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 unit may
be operated only by persons who are absolutely familiar with these materials and the unit.
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 GmbH
Eisenbahnstraße 45
77960 Seelbach / Germany
Tel. [phone] / 51-0 [email protected]
Fax [phone] / 24 91 www.julabo.de
Safety recommendations for the operator
You received a product conceived for industrial use. Nevertheless, avoid strikes to the
housing, vibrations, damages to the keypad foil (keys, display) or contamination.
Make sure the product is regularly checked for proper condition. Regularly check (at least
every 2 years) the proper condition of the mandatory, warning, prohibition and safety
labels.
Take care that the mains supply features a low impedance to avoid any negative affects
on the instrument being operated in 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 influence other units with components
susceptible to magnetic fields (e.g. a monitor). We recommend to keep a minimum
distance of 1 m.
Permissible ambient temperature: max. 40 °C, min. 5 °C.
Permissible relative air humidity: 50 % (40 °C).
Do not store in an aggressive atmosphere. Protect from contaminations.
Do not expose to sunlight.
Appropriate Operation
Only qualified personnel is authorized to perform configuration, installation, maintenance and
repairs of the water bath.
Routine operation can also be carried out by untrained personnel who should however be
instructed by trained personnel.
Use
For the use according to the intended purpose, special material requirements have to be
respected (bath fluids). Only use non-acid and non corroding materials.

Operator responsibility – Safety instructions
6
Observe all warnings for the used materials (bath fluids) and the respective instructions
(safety data sheets).
Only use the unit in well ventilated areas. The recirculating coolers are not for use in
explosive atmosphere
When using hazardous materials or materials that could become hazardous, the operator
must affix the enclosed safety labels (1 + 2) to the front of the unit so they are highly visible:
1
Warning label W00: Colors: yellow, black
Danger area. Attention! Observe instructions.
(operating manual, safety data sheet)
2
or
Mandatory label M018: Colors: blue, white
Carefully read the user information prior to beginning operation.
Scope: EU
2
Semi S1-0701 Table A1-2 #9
Carefully read the user information prior to beginning operation.
Scope: USA, NAFTA
Observe the instructions in the manuals for instruments of a different make that you connect
to the recirculating cooler, particularly the corresponding safety instructions. Also observe the
pin assignment of plugs and technical specifications of the products.
2.1. Disposal
This unit contains the refrigerants R134a or R404A – at this time considered not to have any
negative effects on the ozone layer. However, during the long operating period of the unit,
disposal prescriptions may change. So only qualified personnel should take care of disposal.
Valid in EU countries
See the current official journal of the European Union – WEEE directive.
Directive of the European Parliament and of the Council on waste electrical
and electronic equipment (WEEE).
This directive requires electrical and electronic equipment marked with a
crossed-out trash can to be disposed of separately in an environmentally
friendly manner.
Contact an authorized waste management company in your country.
Disposal with household waste (unsorted waste) or similar collections of
municipal waste is not permitted!

Recirculating coolers
7
2.2. EC Conformity
The products described in the operating instructions conform to the
requirements of the following European guidelines:
Directive of the European Parliament and of the Council on the approximation of the laws of
the Member States relating to machinery.
Low voltage regulations with respect to legal harmonization of the member countries
concerning electric devices for use within certain voltage limits.
EMC guideline with respect to legal harmonization of the member countries concerning
electromagnetic compatibility.
JULABO GmbH
Eisenbahnstr. 45
77960 Seelbach / Germany
2.3. Warranty conditions
JULABO GmbH warrants its products against defects in material or in workmanship, when
used under appropriate conditions and in accordance with appropriate operating instructions
for a period of ONE YEAR.
Extension of the warranty period – free of charge
With the ‘1PLUS warranty’ the user receives a free of charge extension to the warranty of up
to 24 months, limited to a maximum of 10 000 working hours.
To apply for this extended warranty the user must register the unit on the JULABO web site
www.julabo.de, indicating the serial no. The extended warranty will apply from the date of
JULABO GmbH’s original invoice.
JULABO GmbH reserves the right to decide the validity of any warranty claim. In case of
faults arising either due to faulty materials or workmanship, parts will be repaired or replaced
free of charge, or a new replacement unit will be supplied.
Any other compensation claims are excluded from this guarantee.

Operator responsibility – Safety instructions
8
2.4. Technical specifications
(with T-pump) FC1200T FCW1200T
Working temperature range °C -10 ... 80 -10 ... 80
Cooling capacity °C 20 10 -10
(water-glycol) kW 0.11 0.75 0.15
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 3.5
Flow rate max. Lpm 28
Pump connections M16x1
Noise level, 1 m distance dBA 58 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 67 69
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2600
(with T-pump) FC1600T FCW1600T
Working temperature range °C -15 ... 80 -15 ... 80
Cooling capacity °C 20 10 -10
(water-glycol) kW 1.45 1.05 0.25
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 3.5
Flow rate max. Lpm 28
with tubing connections mm dia. 13.5 / 9.5
Pump connections M16x1
Noise level, 1 m distance dBA 58 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 67 69
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2700
All data have been determined at rated voltage and frequency
ambient temperature: 20 °C bath liquid: water-glycol

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(with T-pump) FCW2500T
Working temperature range °C -25 ... 80
Cooling capacity °C +20 +10 +5 0 -10 -20
(water-glycol) kW 2.5 2.0 1.8 1.5 0.8 0.25
Refrigerant R404A
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 3.5
Flow rate max. Lpm 28
Pump connections M16x1
Noise level, 1 m distance dBA 70
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Shipping weight kg 74
Mains power connection V/Hz 230/60
Total power consumption W 2800
(with S-pump) FC1200S FCW1200S
Working temperature range °C -15 ... 80-15 ... 80
Cooling capacity °C 20 10 5 -10
(water-glycol) kW 0.12 0.85 0.65 0.26
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 1.2
Flow rate max. l/min 22 / 15
with tubing connections mm dia. 13.5 / 9.5
Pump connections M16x1
Noise level, 1 m distance dBA 57 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 66 68
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2800
All data have been determined at mains voltage: 230 V / 50 Hz
ambient temperature: 20 °C bath liquid: water-glycol

Operator responsibility – Safety instructions
10
(with S-pump) FC1600S FCW1600S
Working temperature range °C -15 ... 80-15 ... 80
Cooling capacity °C 20 10 5 -10
(water-glycol) kW 1.55 1.15 0.9 0.36
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 1.2
Flow rate max. l/min 22 / 15
with tubing connections mm dia. 13.5 / 9.5
Pump connections M16x1
Noise level, 1 m distance dBA 57 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 66 68
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2900
(with Ju-pump) FC600 -T
Working temperature range °C -20 ... 80
Cooling capacity °C 20 10 5 -10
(water-glycol) kW 0.6 0.47 0.4 0.21
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 0.5
Flow rate max. Lpm 20 / 14
with tubing connections mm dia 13,5/9,5
Pump connections M16x1
Noise level, 1 m distance dBA 51
Filling volume l 6 ... 8
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 48
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2000
All data have been determined at rated voltage and frequency
ambient temperature: 20 °C bath liquid: water-glycol

Recirculating coolers
11
(with Ju-pump) FC1200 -T
Working temperature range °C -20 ... 80
Cooling capacity °C 20 10 5 -10
(water-glycol) kW 1.3 0.95 0.75 0.37
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 0.5
Flow rate max. Lpm 20 / 14
with tubing connections mm dia. 13,5/9,5
Pump connections M16x1
Noise level, 1 m distance dBA 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 65
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2300
(with Ju-pump) FC1600 -T
Working temperature range °C -20 ... 80
Cooling capacity °C 20 10 5 -10
(water-glycol) kW 1.65 1.25 1.0 0.47
Refrigerant R134a
Heater capacity kW 1.2
Pump capacity:
Pressure max. bar 0.5
Flow rate max. Lpm 20 / 14
with tubing connections mm dia. 13,5/9,5
Pump connections M16x1
Noise level, 1 m distance dBA 53
Filling volume l 8 ... 11
Dimensions (WxLxH) cm 46 x 61 x 49
Ambient temperature °C 5 ... 40
Shipping weight kg 65
Mains power connection V/Hz 208-230/60 or 230/50
Total power consumption W 2400
All data have been determined at rated voltage and frequency
ambient temperature: 20 °C bath liquid: water-glycol

Operator responsibility – Safety instructions
12
Temperature selection digital (keypad)
Resolution °C 0.1
MULTI-DISPLAY indications LED + LED
Resolution °C 0.1
Display accuracy % 0.5
Temperature stability °C ±0.2
Temperature control on/off
Control ratio for feed/return flow temperature, adjustable % 0 ... 100
Temperature sensor (number) PTC (3)
Level indication spy-glass
Error message indication LED
Electrical connections:
Computer interface RS 232
Stand-by input conforming to Namur recommendations
Alarm output potential-free
Return flow safety device V 230
External sensor (4-lead technique) Pt100
Programmer V/mA 0 to 10 / 0 to 24
Temperature recorder (0 V = 0 °C) mV/K 10 (RI = 100 Ohms)
Safety installations
(adjustable via LED):
High temperature protection °C -25 ... 85
Low temperature protection °C -25 ... 85
Low liquid level protection float switch
Classification according to DIN 12876-1 III
Overload protection for pump motor contactor
Overload protection for cooling compressorcontactor
Alarm signal optical + audible
Environmental conditions according to IEC 61 010-1:
Use only indoor.
Altitude up to 2000 m - normal zero.
Ambient temperature: +5 ... +40 °C
Air humidity:
Max. rel. humidity 80 % for temperatures up to +31 °C,
linear decrease down to 50 % relative humidity at a temperature of +40 °C
Max. mains fluctuations of ±10 % are permissible.
IP 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.
Standards for interference resistance according to EN 61326-1
This unit is an ISM device classified in Group 1 (using high frequency for internal purposes)
Class A (industrial and commercial range).

Recirculating coolers
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2.5. Cooling water connection
Only for water cooled models - FCW:
Cooling water pressure (IN / OUT ) max. 6 bar
Difference pressure (IN - OUT ) 3.5 to 6 bar
Cooling water temperature <20 °C
Recommended quality of cooling water:
pH – value 7,5 to 9,0
Sulfate [SO4 2- ] < 100 ppm
Hydrocarbonate [HCO3- ] / Sulphate [SO4 2-] > 1 ppm
Hardness [Ca2+, Mg2+] / [HCO3-] > 0,5 dH
Alkalinity 60 ppm < [HCO3-] < 300 ppm
Conductivity < 500 μs / cm
Chloride (CL-) < 50 ppm
Phosphate (PO43-) < 2 ppm
Ammonia (NH3) < 0,5 ppm
Free Chlorine < 0,5 ppm
Ferri Ions (Fe3+ ) < 0,5 ppm
Mangano Ions (Mn2+) < 0,05 ppm
Carbon dioxide (CO2) < 10 ppm
Hydrosulfide (H2S) < 50 ppm
Content of oxygen < 0,1 ppm
Algae growth impermissible
Suspended solids impermissible
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of
cooling water.
Due to its high content of lime hart water is not suitable for cooling and
causes calcination of the heat exchanger.
Ferrous water or water containing ferrous particles will cause formation of
rust even in heat exchangers made of stainless steel.
Chlorous water will cause pitting corrosion in heat exchangers made of
stainless steel.
Due to its corrosive characteristics distilled and deionized water is
unsuitable and will cause corrosion of the bath. .
Due to its corrosive characteristics sea water is not suitable.
Due to its microbiological (bacteria) 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.

Safety notes for the user
14
3. Safety notes for the user
3.1. 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.
3.2. Explanation of other notes
Note!
Draws attention to something special.
Important!
Indicates usage tips and other useful information.
3.3. Safety instructions
Follow the safety recommendations to prevent damage to persons or
property. Further, the valid safety instructions for working places must be
followed.
Only connect the unit to a power socket with 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 instrument on an even surface on a pad made of non-
inflammable material.
Never operate the unit without bath fluid in the bath.
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.

Recirculating coolers
15
Do not drain the bath fluid while it is hot or cold!
Check the temperature of the bath fluid prior to draining (by switching the
unit on for a short moment for example).
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 equipment.
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 equipment with damaged mains power cables.
Repairs are to be carried out only by qualified service personnel.

Operating controls and functional elements
16
4. Operating controls and functional elements
1. Mains power switch, illuminated
7. Filling funnel
8. Drain tubing
9. Drain tap
10. Filling level indication
11. Pump pressure gauge
10.
7. 11.
8.
9.
1.
2. MULTI-Display temperature indication (LED 1 + LED 2)
3. Indicator lights
Alarm
Heating
Cooling
Temp.
Control = Keypad control mode
= Remote control mode

Recirculating coolers
17
4. Keys for actual values (LED 1)
A Key - Indication of feed temperature
B Key - Indication of return temperature
C Key - Indication of safety temperature
4.1 Key - Indication of actual temperature of external sensor
4.2 The "MENUE" key is not required for normal operating
4.3
The key "SPEC" is not required for this model version.
5. Keys for setpoint values (LED 2)
E Key - Indication or setting of working temperature
F Key - Indication or setting of high temperature
G Key - Indication or setting of low temperature
H Key - Indication or setting of control ratio for feed/return
flow temperature
J Key - Circulating pump On/Off
5.1 Key - "SPEC" - PID control parameters
5.2 Cursors left/right
5.3 Edit keys (increase/decrease setting)
5.4 Enter key (start, store)
6. Electrical connectors
ON K ML
O Programmer input and temperature recorder output
N Connector for external Pt100 sensor
K Interface RS 232
M Alarm output (for external alarm signal)
L Stand-by input conforming to NAMUR recommendations
(external emergency switch-off)

Operating controls and functional elements
18
Rear
12.1 Pump connector: Feed
12.2 Pump connector: Return
13. Overflow port for bath tank
14. Connectors for solenoid valves
15. Mains power cable with plug
!
16.2
12.1 16.1
12.2
13.
14.
Only for water cooled models:
16.1 Cooling water OUTLET
16.2 Cooling water INLET

Recirculating coolers
19
5. Operation
5.1. Preparations
12.1 12.2
M16x1
!
13.
14.
16.2
12.1
16.1
12.2
16.1 16.2
¾"
Place the unit in an upright position.
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: 40 °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.
> For 0.25 kg of refrigerant R134a, 1 m3 of space is
required.
> For 0.52 kg of refrigerant R404A, 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 setting it up. This will allow any oil that has
accumulated laterally during transport to flow back down
thus ensuring maximum cooling performance of the
compressor.
Connect the tubings for cooling the external system to the
pump connectors for feed and return (12.1. and 12.2.) on
the rear of the recirculating cooler.
Return flow safety device see page 20
If necessary, connect a tube to the overflow port (13.) for
controlled draining of the liquid.
Do not close the overflow port.
Only for water cooled models:
Ensure circulation of cooling water by connecting the
tubing to cooling water inlet (16.2.) and outlet (16.1) on the
rear of the recirculating cooler.
Cooling water temperature: <20 °C
Quality of cooling water see page 13.
Caution:
Securely attach all tubing to prevent slipping.

Operation
20
Notice: Cooling water circuit
Risk of oil leaking from the cooling circuit (compressor) of the recirculating
cooler into the cooling water in case of a fault in the circuit!
Observe the laws and regulations of the water distribution company valid in
the location where the unit is operated.
5.2. Return flow safety device
Notice: Flood hazard!.
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.
Return flow safety device
Should the filling volume of the bath tank not be sufficient, prevent the liquid
from flowing back by using shut-off valves..
In case the system to be cooled is located at a higher level
than the recirculating cooler, prevent the bath liquid from
flowing back when the unit is turned off.
For this purpose, connect electrical solenoid valves or
mechanical shut-off valves to the connectors for feed and
return (12.1. and 12.2.).
The solenoid valve is electrically connected to the
connectors (14.). As soon as the recirculating cooler is
switched off, the valves close automatically. (Filling - see
page 22)
Order No. 8 980 701 Set of solenoid valve (230 V)
13
.
12.
112. 2
14
.