Julabo FL1201 User manual

19534822_a.doc Druck: 02.05.2011
English
Operating manual
Recirculating Coolers
FL1201
FL1203
FL1701 FLW1701
FL1703 FLW1703
RS2 32 AL ARM
FL1203
JULABO USA, Inc.
884 Marcon Boulevard
Allentown, PA 18109
Phone: [phone]
Fax: [phone]
info @ julabo.com
www.julabo.com

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 9001:2008. 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.
Lifting device for transportation by crane see page 16
1.953.4822 04/11 Printed in Germany Changes without prior notification reserved
Important: keep operating manual for future use

3
TABLE OF CONTENTS
1. Intended use................................................................................................................................. 4
1.1. Description........................................................................................................................ 4
2. Operator responsibility – Safety instructions ................................................................................ 4
2.1. Disposal ............................................................................................................................ 6
3. Technical specifications................................................................................................................ 7
3.1. Cooling water connection................................................................................................ 11
4. Safety notes for the user ............................................................................................................ 12
4.1. Explanation of safety notes............................................................................................. 12
4.2. Explanation of other notes .............................................................................................. 12
4.3. Safety instructions........................................................................................................... 12
5. Installation .................................................................................................................................. 14
5.1. Tubing............................................................................................................................. 15
6. Operating controls and functional elements ............................................................................... 16
7. Operating procedures................................................................................................................. 18
7.1. Bath fluids ....................................................................................................................... 18
7.2. Power connection ........................................................................................................... 19
7.3. Filling............................................................................................................................... 19
7.4. Switching on / Start - Stop .............................................................................................. 20
7.5. Setting the feed pressure................................................................................................ 20
7.6. Setting the temperatures................................................................................................. 20
7.7. AUTOSTART ON / OFF.................................................................................................. 21
7.8. Remote control: activate – deactivate............................................................................. 21
8. Safety installations...................................................................................................................... 22
8.1. Excess temperature protection ....................................................................................... 22
8.2. Low level protection ........................................................................................................ 22
9. Troubleshooting guide / Error messages.................................................................................... 22
10. Electrical connections ....................................................................................................... 24
11. Remote control..................................................................................................................24
11.1. Setup for remote control ................................................................................................. 24
11.2. Communication with a PC or a superordinated data system .......................................... 25
11.3. List of commands............................................................................................................ 26
11.4. Status messages ............................................................................................................ 26
11.5. Error messages............................................................................................................... 26
12. Cleaning / repairing the unit .............................................................................................. 27
12.1. Draining........................................................................................................................... 29
13. Adequate storing of operating manual .............................................................................. 29
14. WARRANTY PROVISIONS .............................................................................................. 30

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 water baths 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
PID1
RS232
The recirculating coolers are operated via the splash-proof keypad. The
implemented microprocessor technology allows to set and to store the setpoint that
can be indicated on the LED temperature display.
The PID temperature regulation is used to withdraw heat from the bath fluid by
means of the cooling machine and to automatically regulate the required need.
Electrical connections:
1. The serial interface RS232 allows modern process technology without
additional interface.
2. Alarm output for external alarm message.
Manually adjustable by-pass (handwheel) to reduce the pump capacity
(e. g. for glass equipment).
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 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.

5
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]
info @ julabo.com
www.julabo.com
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.
Observe all warnings for the used materials (bath fluids) and the respective instructions (safety data
sheets).
Only use the unit in well ventilated areas. (see page 14).
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 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.

6
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
3
Warning label Proposition 65
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.
2.1. Disposal
This unit contains the refrigerants R134a or R404A, which at this time are 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.

7
3. Technical specifications
Recirculating Cooler
Cooling
FL1201 FL1203
air cooled air cooled
Working temperature range °C -20 ... +40 -20 ... +40
Temperature stability °C ±0.5
Temperature selection: digital
via key pad indication on LED-DISPLAY
remote control via personal computer indication on monitor
Temperature indication: LED-DISPLAY
Resolution °C 0.1
Temperature control PID 1
Temperature sensor Pt 100
Excess temperature protection 85 °C - fixed value
Low liquid level protection float switch
Cooling capacity
Medium: Mixture water-glycol
°C
kW
+20 0 -10 +20 0 -10
1.2 0.9 0.6 1.2 0.8 0.5
Cooling compressor 1-stage
Refrigerant R404A
Electrical connections:
Computer interface RS232
Alarm output for external alarm signal
Circulating pump:
discharge, max. at 0 bar l/min 23 40
pressure, max. at 0 liter bar 1.0
pressure, adjustable at 0 Liter bar ---- 0.5 ... 3.0
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 12 ... 17
Dimensions (WxLxH) cm 50x76x64
Weight kg 76 91
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
IP class according to IEC 60 529 IP 21
Mains power connection 230 V/50 Hz V/ Hz 207-253 / 50 207-253 / 50
Current input at 230 V A 7 12
Mains power connection 208 - 220 V/60 Hz V/ Hz 197 - 242 / 60 197 - 242 / 60
Current input at 208V / 220 V A 6 ----
Mains power connection 115 V/60 Hz V/ Hz 103 -127 / 60 ----
Current input at 115 V A 14 ----
All measurements have been carried out at: rated voltage and frequency,
ambient temperature: 20 °C

8
Recirculating Cooler
Cooling
FL1701 FLW1701
air cooled water cooled
Working temperature range °C -20 ... +40 -20 ... +40
Temperature stability °C ±0.5
Temperature selection: digital
via key pad indication on LED-DISPLAY
remote control via personal computer indication on monitor
Temperature indication: LED-DISPLAY
Resolution °C 0.1
Temperature control PID 1
Temperature sensor Pt 100
Excess temperature protection 85 °C - fixed value
Low liquid level protection float switch
Cooling capacity
Medium: Mixture water-glycol
°C
kW
+20 0 -10 +20 0 -10
1.7 1.1 0.85 1.7 1.1 0.85
Cooling compressor 1- stage
Refrigerant R404A
Electrical connections:
Computer interface RS232
Alarm output for external alarm signal
Circulating pump:
discharge, max. at 0 bar l/min 23 23
pressure, max. at 0 liter bar 1.0 1.0
pressure, adjustable at 0 Liter
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 12 ... 17
Dimensions (WxLxH) cm 50x76x64
Weight kg 85 82
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
Cooling water
Flow rate at 20 °C inlet temperature l/min ----- 2.8
Mains power connection 230 V/50 Hz V/ Hz 207-253 / 50 207-253 / 50
Current input at 230 V A 10 10
Mains power connection 208 - 220 V/60 Hz V/ Hz 197 - 242 / 60 197 - 242 / 60
Current input at 208V / 220 V A 8 ----
Mains power connection 115 V/60 Hz V/ Hz 103 -127 / 60 103 -127 / 60
Current input at 115 V A ---- ----
All measurements have been carried out at: rated voltage and frequency,
ambient temperature: 20 °C

9
Recirculating Cooler
Cooling
FL1703 FLW1703
air cooled water cooled
Working temperature range °C -20 ... +40 -20 ... +40
Temperature stability °C ±0.5
Temperature selection: digital
via key pad indication on LED-DISPLAY
remote control via personal computer indication on monitor
Temperature indication: LED-DISPLAY
Resolution °C 0.1
Temperature control PID 1
Temperature sensor Pt 100
Excess temperature protection 85 °C - fixed value
Low liquid level protection float switch
Cooling capacity
Medium: Mixture water-glycol
°C
kW
+20 0 -10 +20 0 -10
1.7 1.0 0.75 1.7 1.0 0.75
Cooling compressor 1- stage
Refrigerant R404A
Electrical connections:
Computer interface RS232
Alarm output for external alarm signal
Circulating pump:
discharge, max. at 0 bar l/min 40 40
pressure, max. at 0 liter bar 0.5 ... 3.0 0.5 ... 3.0
pressure, adjustable at 0 Liter
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 12 ... 17
Dimensions (WxLxH) cm 50x76x64
Weight kg 91 88
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
Cooling water
Flow rate at 20 °C inlet temperature l/min ----- 2.8
Mains power connection 230 V/50 Hz V/ Hz 207-253 / 50 207-253 / 50
Current draw at 230 V A 12 11
Mains power connection 208 - 220 V/60 Hz V/ Hz 197 - 242 / 60 197 - 242 / 60
Current draw at 208V / 220 V A 11 ----
All measurements have been carried out at: rated voltage and frequency,
ambient temperature: 20 °C

10
Warning functions and safety installations
Excess temperature protection 85 °C - fixed value
Low liquid level protection float switch
Alarm message optical + audible (permanent)
Excess temperature - Warning function 75 °C
Overload protection for compressor and pump motor
Classification according to DIN 12876-1 class I
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.
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).

11
3.1. Cooling water connection
Only for water cooled models - FLW:
Cooling water pressure (IN / OUT ) max. 6 bar
Difference pressure (IN - OUT ) 2 bar bis 6 bar
Flow rate typical 2,8 l/min
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.
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.

12
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 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.
•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.
•Never operate the unit without bath fluid in the bath.
•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.
•Make sure that the tubing is securely attached.
•Avoid sharp bends in the tubing, and maintain a sufficient distance from

13
surrounding walls.
•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.
•Risk of injury for hands. Close cover carefully.
WARNING
This product contains chemicals known to the state of California to cause cancer, birth
defects or other reproductive harm.

14
5. Installation
Rear view:
•Place the unit on an even surface on a base made of nonflammable
material.
•Cooling machine, pump motor and electronics produce intrinsic heat
that is dissipated via the venting openings.! Never cover these
openings!
•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.
16
A
M
P
16
A
M
P
IN
OU
Example: FL1201 (air cooled)
IN
OUT
1
6
A
M
P
1
6
A
M
P
I
N
OU
T
min
Example: FL1703 (watter cooled,
pressure, adjustable 0,5 ... 3, 0 bar)
IN
OUT
12 mm inner dia.
Example:
PVC-tubing
•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.
> For 0.48 kg of refrigerant R-404A, 1 m3 of space is
required.
•Example: model FL1703with 0.7 kg filling quantity of
refrigerant R404A = 1.46 m3volume
•Connect the tubings for cooling the external system to
the pump connectors M16x1 for feed and return (14)
on the rear of the recirculating cooler.
- Feed – Return
•Connect a piece of tubing to the overflow connector
(15) and drain into a suitable vessel, which always has
to be placed lower thant the exit „Overflow“.
•Turn the adjusting valve (14) counter-clockwise to set
the lowest manometric pressure.
•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.
•Only water cooled models - FLW:
Ensure circulation of cooling water by connecting the
tubing to cooling water inlet (IN)and outlet (OUT) on
the rear (16) of the recirculating cooler.
Cooling water see page 11.
Cooling water connectors G3/4" external thread
Tubing 12 mm inner dia. tubing
IN Cooling water inlet
OUT Cooling water outlet

15
Caution: Pump pressure
•Determine and check the max. admissible pressure for the external circuit before
putting the unit into operation. The max. pressure is determined by the weakest
element in the circuit (e. g. glass equipment).
•Securely attach all tubing to prevent slipping.
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..
Order No. Description Suitable for
8 970 456 Shut-off valve for loop circuit, M16x1 FL1201 / FL(W)1701
8 970 454 Shut-off valve G ¾“ FL1203 / FL(W)1703
The following questions shall help to recognize possible dangers and to reduce the
risks to a minimum.
•Are all tubes and electrical cables connected and installed?
Note:
sharp edges, hot surfaces in operation, moving machine parts, etc.
•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.
5.1. Tubing
Caution:
•Employ 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).
•Preventive maintenance: Replace the tubing from time to time.
Recommended tubing:
Order No. Description Suitable for
8930308 1 m CR®-tubing 8 mm inner dia. (-20 ... +120°C) FL1201
8930312 1 m Reinforced tubing 8 mm inner dia. (-40 ... +120°C) FL1201
8930319 1 m Reinforced tubing ¾“ inner dia. (-40 ... +120°C) FL(W)1203/1703
Tubing insulation
8930412 1 m Insulation, 18 mm inner dia. Reinforced tubing 8 mm inner dia.
8930413 1 m Insulation, 23 mm inner dia. Reinforced tubing 12 mm inner dia.
8930419 1 m Insulation, 29 mm inner dia. Reinforced tubing ¾“ inner dia.
Tube clamps
8970481 2 Tube clamps, size 2 Reinforced tubing 8 mm inner dia.
8970482 2 Tube clamps, size 3 Reinforced tubing 12 mm inner dia.
8970483 2 Tube clamps, size 4 Reinforced tubing ¾“ inner dia.

16
6. Operating controls and functional elements
Front view Rear view
RS232
A
LARM
1234
5
6
7
8
9
10
IN
OUT
11
12
13
15
17
Air cooled model
feed pressure not adjustable
RS232
A
LARM
1234
5
6
7
8
9
10
IN
OUT
IN
OUT
11
12
13
13
14
1
5
16
17
Water cooled model (16)
with feed pressure adjusting valve (14)
or
Lifting device for transportation by crane
and handle at the front

17
1
Mains power switch, spash-water protected
on
off
2.0 Keypad, spash-water protected
2.1 Edit keys (set point increase or decrease)
2.2 Enter key Store set point value / parameter
3.0 Indication
3.1
°C
LED temperature display
3.2 Control indicator – Cooling
3.3
Control indicator – Alarm
4 Protection lid for fill in opening
5
RS232
Interface RS232: remote control via personal computer
6
Alarm output (for external alarm signal)
7 Feed pressure indication: Manometer
8 Filling level indication
9 Drain tap with drain port
10 Venting grid, removable
11
Mains fuses: 16 A (230 V unit)
20 A (115 V unit)
12 Mains power cable with plug
13
Pump connector OUT – pressure pump
Pump connector IN– Return
FL/FLW1201 M16x1
FL/FLW1203 G ¾“ external thread
FL/FLW1703 G ¾“ external thread
14 Feed pressure adjusting valve
15
Overflow connector
16
IN
OUT
Only water cooled models
IN Cooling water inlet
OUT Cooling water outlet
G3/4" external thread
12 mm inner dia. tubing
17 Castor (at the back)
18 Protection lid for storing place of operating manual

18
Top view
Push
Push
4
1
8
4Protection lid for fill in opening
18 Protection lid for storing place of
operating manual
7. Operating procedures
7.1. Bath fluids
Caution:
No liability for use of other bath liquids!
Please contact JULABO before using other than recommended bath fluids. JULABO
takes no responsibility for damages caused by the selection of an unsuitable bath fluid
Do not use alcohols.
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 calcification in the bath.
•Ferrous water can cause corrosion - even on stainless steel.
•Chloric water can cause pitting corrosion.
•Distilled and deionized water is unsuitable. Their special properties cause corrosion
in the bath, even in stainless steel.
Water: - No liablity for use with water.
Danger of freezing at working temperatures <5 °C.
Recommended bath fluids:
Bath fluids Temperature range
soft/decalcified water 5 °C to 80 °C
See website for list of recommended bath fluids.
Contact: see page 5

19
7.2. Power connection
Caution:
•Only connect the unit to a power socket with earthing contact (PE – protective earth)!
This power socket must be protected by fuses. The release current of the fuses may
not be higher than the value specified for the instrument fuses.
We disclaim all liability for damage caused by incorrect line voltages!
•The power supply plug serves as safe disconnecting device from the line and must
be always easily accessible.
•Never operate equipment with damaged mains power cables.
•Regularly check the mains power cables for material defects (e.g. for cracks).
Make sure that the line voltage and frequency match the supply voltage specified on the
type plate.
7.3. Filling
Notice:
Risk of injury for hands. Close cover carefully.
Top view
Push
Push
Take care that no liquid enters the interior of the circulating cooler.
LConnect the tubing from the external system to the pump
connectors and check for leaks
Respect instructions from page 14 to page 15!
LCheck to make sure that the drain tap (9) is closed.
•Unlock and open lid of fill in opening (4) by slightly pushing.
•Fill in tempering fluid up to marking „H“ of the filling level indicator.
H
L
•Turn the mains switch (1) on
(Switching on - see page 20)
•Switch on unit. To do so press button for approx. 4 seconds.
•Tempering fluid is pumped into the externally connected system.
Refill fluid up to marking „H“.
•The recirculating cooler is ready for operation.

20
7.4. Switching on / Start - Stop



Switching on:
The recirculating cooler is turned on and off with the mains switch.
The unit performs a self-test. All segments of the 4-digit LED
temperature DISPLAY and all indicator lights will illuminate
(as illustrated on the left).
Then the software version and the type of unit is indicated.
Examples: (v 1.02) (FL1703)
The display "OFF" indicates the unit is ready to operate (standby
mode).
Start: Press enter for about 4 seconds.
The LED temperature DISPLAY indicates the actual bath
temperature.
Stop: Press enter for about 4 seconds.
Turn the unit off with the mains power switch.
7.5. Setting the feed pressure
max.
Set the max. permissible feed pressure (example: 2 bar) by slowly
closing the adjusting valve (14) on the rear and looking at the
manometer (7).
LThe max. pressure is determined by the weakest element in the
circuit (e. g. glass equipment).
7.6. Setting the temperatures
Factory setting: 25 °C
LSetting can be carried out in the start/stop condition.
1. Press one of the keys for a short moment.
The setpoint value instead of the actual value is indicated on the
display for about 8 seconds.
The value can now be changed.
2. Change value:
Press to set a higher value.
Press to set a lower value.
Keep the keys depressed for the value to change fast.
3. Press enter to store the value.