Operating manual

Recirculating Coolers

FL300

FL601

English

19514818-V5.docx 04.07.19
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 principles of
operating and possibilities of our circulators. For optimum 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.

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.

RoHS directive on the restriction of the use of certain hazardous substances in electrical and
electronic equipment.

JULABO GmbH
Gerhard-Juchheim-Strasse 1
77960 Seelbach / Germany

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4
5
TABLE OF CONTENTS
1. Intended use ................................................................................................................... 8
1.1. Description ........................................................................................................... 8
2. Operator responsibility – Safety instructions ................................................................... 8
2.1. Disposal...............................................................................................................12
3. Technical specifications .................................................................................................13
4. Safety notes for the user ................................................................................................20
4.1. Explanation of safety notes .................................................................................20
4.2. Explanation of other notes ...................................................................................20
4.3. Safety instructions ...............................................................................................21
5. Installation ......................................................................................................................23
5.1. Tubing .................................................................................................................26
6. Operating controls and functional elements ...................................................................27
7. Operating procedures ....................................................................................................29
7.1. Bath fluids............................................................................................................29
7.2. Power connection ................................................................................................30
7.3. Filling ...................................................................................................................31
7.4. Switching on / Start - Stop ...................................................................................32
7.5. Setting the temperatures .....................................................................................33
7.6. AUTOSTART ON / OFF ......................................................................................34
7.7. Remote control: activate – deactivate .................................................................35
8. Safety installations .........................................................................................................36
6
 8.1. Excess temperature protection ........................................................................... 36
8.2. Low level protection ............................................................................................ 36
9. Troubleshooting guide / Error messages ....................................................................... 37
10. Electrical connections............................................................................................ 39
11. Remote control ...................................................................................................... 40
11.1. Setup for remote control...................................................................................... 40
11.2. Communication with a PC or a superordinated data system............................... 41
11.3. List of commands ................................................................................................ 43
11.4. Status messages................................................................................................. 44
11.5. Error messages ................................................................................................... 44
12. Cleaning / repairing the unit .................................................................................. 45
13. Adequate storing of operating manual .................................................................. 47
14. Draining ................................................................................................................. 48
15. Warranty conditions .............................................................................................. 49

7
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
 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:
PID1 1. The serial interface RS232 allows modern process technology without
additional interface.
2. Alarm output for external alarm message.
RS232

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.

8
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 Tel. +49 7823 51-0 info.de@julabo.com
Gerhard-Juchheim-Strasse 1 Fax +49 7823 2491 www.julabo.com
77960 Seelbach / Germany

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.
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 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 23).
The recirculating coolers are not for use in explosive atmosphere

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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 Danger area. Attention! Observe instructions.
(operating manual, safety data sheet)

2 Carefully read the user information prior to beginning operation.

Scope: EU
or
2 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
circulator, particularly the corresponding safety instructions. Also observe the pin assignment of
plugs and technical specifications of the products.

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2.1. Disposal
This unit contains the refrigerants R134a, R404A or R452A, 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.

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!

12
3. Technical specifications
Recirculating Cooler FL300
Working temperature range °C -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

Electrical connections:
Computer interface RS232
Alarm output for external alarm signal

Circulating pump:
discharge, max.at 0 bar l/min 15
pressure, max. at 0 Liters bar 0.35

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Recirculating Cooler FL300
bar
Filling level indicator sight glass
Filling volume from ... to Liters 3 ... 4.5
Dimensions (WxLxH) cm 25x50x60
Weight kg 35
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
IP class according to IEC 60 529 IP 21

Cooling compressor 1- stage / air cooled

Refrigerant R134a

Cooling capacity (at A, B, C) °C +20 +10 0 -10 -20

Medium: Mixture water-glycol kW 0.3 0.25 0.2 0.15 0.1
A Mains power connection V / Hz 230 ± 10 % / 50
Current input at 230 V A 3.0
B Mains power connection V / Hz 230 +5 % - 15 % / 60
Current input at 230 V A 3.0
C Mains power connection V / Hz 115 ± 10 % / 60
Current input at 115 V A 6.0

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Recirculating Cooler FL300

Cooling capacity (D at 200 V/50 Hz) °C +20 +10 0 -10 -20

Medium: Mixture water-glycol kW 0.3 0.25 0.2 0.15 0.06
Cooling capacity (D at 200 V/60 Hz) °C +20 +10 0 -10 -20
Medium: Mixture water-glycol kW 0.3 0.25 0.2 0.15 0.09

D Mains power connection V / Hz 200 ± 10 % / 50

200 ± 10 % / 60
Current input at 200 V A 3.0

All measurements have been carried out at: rated voltage and frequency,
ambient temperature: 20 °C

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Recirculating Cooler FL601
Working temperature range °C -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 °C +20 +10 0 -10 -20
Medium: Mixture water-glycol kW 0.6 0.5 0.4 0.33 0.2
Cooling compressor 1- stage / air cooled
Refrigerant R404A, R452A*

Electrical connections:
Computer interface RS232
Alarm output for external alarm signal

* at 230 V / 50 Hz

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Circulating pump:
discharge, max.at 0 bar l/min 23
pressure, max. at 0 Liters bar 1.0
bar -----
Filling level indicator sight glass
Filling volume from ... to Liters 5.5 ... 8
Dimensions (WxLxH) cm 32x50x60
Weight kg 48
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
IP class according to IEC 60 529 IP 21

Mains power connection V / Hz 230 ± 10 % / 50

Current input at 230 V A 5.0
Mains power connection V / Hz 230 ± 10 % / 60
Current input at 230 V A 5.0
Mains power connection V / Hz 115 ± 10 % / 60
Current input at 115 V A 10.0
All measurements have been carried out at: rated voltage and frequency,
ambient temperature: 20 °C

17
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
Permissible max. mains fluctuations are shown in the Technical specifications.
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).

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Information about the used refrigerants
The Regulation (EU) No. 517/2014 on fluorinated greenhouse gases applies to all systems which
contain fluorinated refrigerants and replaces (EC) 842/2006.
The aim of the Regulation is to protect the environment by reducing emissions of fluorinated
greenhouse gases.
Among other things it regulates the emission limits, use and recovery of these substances. It also
contains requirements for operators of systems which require / contain these substances to function.

Under Regulation 517/2014, the operator of a system of this nature has the following duties:

• The operator must ensure that the equipment is checked at regular intervals for leaks.
• These intervals depend on the CO2 equivalent of the system. This is calculated from the
refrigerant fill volume and type of refrigerant. The CO2 equivalent of your system is shown on
the model plate.
• The operator undertakes to have maintenance, repair, service, recovery and recycling work
carried out by certified personnel who have been authorized by JULABO.
• All such work must be documented. The operator must keep records and archive them for at
least five years. The records must be submitted to the relevant authority on request.

Refer to the text of the Regulation for further information.

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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.

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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
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.

21
 • 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.

• Some parts of the bath tank and the pump connections may become extremely
cold during continuous operation. Therefore, exercise particular caution when
touching these parts.

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5. Installation
• 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.
• 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.
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 necessary amount of refrigerant is specified on the type
plate.
> 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.
> For 0.423 kg of refrigerant R452A, 1 m3 of space is required.
•

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Example: FL300  • Connect the tubings for cooling the external system to
the pump connectors M16x1 for feed and return (12) on
the rear of the recirculating cooler.

15
A
M
P
15
A
M
P
- Feed – Return

• Connect a piece of tubing to the overflow connector (13)

and drain into a suitable vessel, which always has to be
placed lower thant the exit „Overflow“.
• 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.

Caution:
Securely attach all tubing to prevent slipping.

24
 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 FL300 / FL601

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.

25
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. Suitable for
8930008 1 m CR -tubing 8 mm inner dia. (-20 ... +120 °C)
® FL300
8930308 1 m Reinforced tubing 8 mm inner dia. (-40 ... +120 °C) FL601
8930312 1 m Reinforced tubing 12 mm inner dia. (-40 ... +120 °C) FL601
Tubing insulation
8930410 1 m Insulation, 14 mm inner dia.. CR®-tubing 8 mm inner dia
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.
Tube clamps
8970480 2 Tube clamps, size 1 CR®-tubing 8 mm inner dia
8970481 2 Tube clamps, size 2 Reinforced tubing 8 mm inner dia.
8970482 2 Tube clamps, size 3 Reinforced tubing 12 mm inner dia.

26
6. Operating controls and functional elements
Example: FL300 Front view Top view Rear view

Push
10

14b
15 15
A A

11
M M
P P

15
Push 12
13

4 Protection lid for

fill in opening
15 Protection lid for
storing place of
operating manual

27
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
°C
3.1 LED temperature display

3.2 Control indicator – Cooling

3.3 Control indicator – Alarm
4.0 Filling opening
5 Alarm output (for external alarm signal)

6 Interface RS232: remote control via personal computer

RS232
7 Filling level indication
8 Drain port
9 Venting grid, removable
10 Mains power cable with plug
11 10 Mains circuit breakers (resettable)
A
M
P

12
Pump connector M16x1: - Feed
Pump connector M16x1: – Return

28
13 Overflow connector

14a Handle: front

14b Handle: rear
15 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.

29
Recommended bath fluids:
Bath fluids Temperature range
soft/decalcified water 5 °C to 80 °C

See website for list of recommended bath fluids.

Contact: www.julabo.com

7.2. Power connection

Caution:
• Only connect the unit to a power socket with earthing contact (PE – protective
earth)!
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.

30
7.3. Filling
Take care that no liquid enters the interior of the circulating
Top view cooler.
 Connect the tubing from the external system to the pump
connectors and check for leaks

Push Respect instructions from page 23 to page 26!

Push  Check to make sure that the drain tap (8) 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.
• Turn the mains switch (1) on
(Switching on - see page 32).
• Switch on unit. To do so press button for approx. 4
Filling level indicator (13) seconds.
H • Tempering fluid is pumped into the externally connected
system.
Refill fluid up to marking „H“.
L • The recirculating cooler is ready for operation.

31
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) (FL300)

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.

32
7.5. Setting the temperatures
Factory setting:  Setting can be carried out in the start/stop condition.
25 °C
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.

33
7.6. AUTOSTART ON / OFF
The recirculating cooler has been configured and supplied by JULABO
according to N.A.M.U.R. recommendations. This means for the start mode,
that the unit must enter a safe operating state after a power failure (non-
automatic start mode). This safe operating state is indicated by „OFF“ on the
LED temperature display. A complete shutdown of the main functional
elements such as compressor and circulating pump is effected
simultaneously.
Should such a safety standard not be required, the AUTOSTART function
(automatic start mode) may be activated, thus allowing the start of the
circulator directly by pressing the mains power switch or using a timer.
Keep depressed enter and
turn on the unit with the mains power switch.
For a short while the LED DISPLAY indicates the effective start mode:

 AUTOSTART on.  AUTOSTART off.

Warning:
For supervised or unsupervised operation with the AUTOSTART function, avoid any
hazardous situation to persons or property.
The circulator does no longer conform to N.A.M.U.R. recommendations.

34
7.7. Remote control: activate – deactivate
The recirculating cooler is to be prepared for remote control by a
personal computer via the serial interface RS232.
Set the interface item from >IOFF< to >ION<.

Remote control: activate – deactivate:

• Switch off recirculating cooler by pressing the mains switch and
wait approx. 5 seconds.
(Interface OFF) • Keep depressed the keys and enter simultaneously and
turn on the unit with the mains power switch.
(Interface On) >I OFF< No remote control via RS232 (Factory setting)
>I On< Remote control via RS232


  The software version and the type of unit is indicated

(see example on the left).
 The display "rOFF" indicates the unit is ready to be operated via
remote control.


35
8. Safety installations
8.1. Excess temperature protection
This safety installation is independent of the control circuit.
When the temperature of the bath fluid has reached the safety temperature

+  (85 °C), a complete shutdown of the compressor and pump is effected.

The alarm is indicated by optical and audible signals (continuous tone) and on
the LED-DISPLAY appears the error message
"Error 14".

8.2. Low level protection

This safety installation is independent of the control circuit.
If the low liquid level protection device is triggered, a complete shutdown of
the compressor and circulating pump is effected.

+  The alarm is indicated by optical and audible signals (continuous tone) and on
the LED-DISPLAY appears the error message
"Error 01".
 Turn off the unit with the mains switch, refill bath fluid and turn the unit on
again!

Caution:
For refill always use the same bath fluid type that is already in the bath.

36
 Notice:
Check the low liquid level protection device at least twice a year!
• To execute a functional test, drain the liquid until the alarm for low liquid level is
triggered. Refill liquid afterwards.
9. Troubleshooting guide / Error messages
Whenever the microprocessor electronics registers a failure, a complete
shutdown of the compressor and circulating pump is performed. The alarm

+  light " " illuminates and a continuous signal tone sounds.

The LED temperature display indicates the cause for the alarm in form of a
code.

Press enter to quit the audible signal.

• The recirculating cooler is operated without bath fluid, or the liquid level is
insufficient.
Replenish the bath tank with the bath fluid.
• Tube breakage has occured (insufficient filling level due to excessive bath
fluid pumped out). Replace the tubing and replenish the bath tank with the
bath fluid.
Cable of the working temperature sensor interrupted or short-circuited.

Error in A/D converter

37
 The return temperature is above the switch-off value of the high temperature
protection (85°C). Check dimensioning of application.
Use a stronger recirculating cooler if necessary.

After eliminating the malfunction, press the mains power switch off and on
again to cancel the alarm state.
If the unit cannot be returned to operation, contact an authorized service
station.

Warning without a complete shutdown of the unit

Excess temperature warning starting at 75 °C
The return temperature soon reaches the swith-off value of the high
temperature protection (85 °C).

If the unit cannot be returned to operation, contact an authorized JULABO

service station.

Disturbances that are not indicated.

Overload protection: a) for cooling machine
b) for pump motor
After a short cooling interval, the unit will automatically start running.
10
A
M
P
Mains circuit breakers (resettable) –10A.

38
10. Electrical connections
Notice: Use shielded cables only.
The shield of the connecting cable is electrically connected to the plug housing.
Use a null modem cable.
The unit ensures safe operation if connecting cables with a maximum length of 3 m are
used. The use of longer cables does not affect proper performance of the unit, however
external interferences may have a negative impact on safe operation.

RS232 serial interface

This port can be used to connect a computer with an RS232 cable for remote
control of the recirculating cooler.

Pin assignments:
5 1 Pin 2 RxD Receive Data
Pin 3 TxD Transmit Data
9 6 Pin 5 0V Signal GND
RS232C
Pin 7 RTS Request to send
Pin 8 CTS Clear to send

Pin 1; 4; 6, 9 Reserved - do not use!

Accessories:
Order No. Description
8 980 073 RS232 interface cable 9-pol./9-pol. , 2,5 m
8 900 110 USB interface adapter cable

39
 Alarm output
Potential-free change-over contact for external alarm signal.

Pin 2 and 3 are connected in case of an alarm.

Pin 2 and 1 are connected in normal condition or mains switch "Off".
or

Switching capacity max. 30 W / 30 VA

Switching voltage max. 30 V∼/−
Switching current max. 1 A

11. Remote control

11.1. Setup for remote control
5 1 Check the interface parameters for both interfaces (on recirculating cooler and
PC) and make sure they match.
9 6
RS232 Interface parameters are pre-determined.

Type RS232
Baudrate 4800 bauds
Parity even
Handshake hardware handshake
Data bits 7
Stop bit 1

40
11.2. Communication with a PC or a superordinated data system
If the recirculating cooler is put into remote control mode the MULTI-DISPLAY
(LED) will read „R -OFF-„ = REMOTE STOP. The recirculating cooler is now
operated via the computer.
In general, the computer (master) sends commands to the recirculating cooler
(slave). The recirculating cooler sends data (including error messages) only
when the computer sends a query.

In remote control mode:

 After a power interruption the order to start and all values which have to be
adjusted must be resent from the personal computer via the interface.
AUTOSTART is not possible.

A transfer sequence consists of:

• command out/in command
• space (⇔; Hex: 20) out/in command
• parameter (the character separating decimals in a group is the
period) out command
• end of file (↵; Hex: 0D) out/in command

• The response (data string) after an in command is always followed by a

line feed (LF, Hex: 0A).

41
 Important times for a command transmission:
To ensure a safe data transfer, the time gap between two commands should
 be at least 250 ms.
The recirculating cooler automatically responds to an in command with a data
string followed by a LF (Line Feed). The next command should only be sent
after 10 ms.

The commands are divided into in or out commands.

in commands: asking for parameters to be displayed
out commands: setting parameters

The out commands are valid only in remote control mode.


Examples:
Command to set the working temperature to15,5 °C:
out_sp_00 ⇔ 15.5↵
Command to ask for the working temperature
in_sp_00↵
Response from the recirculating cooler:
15.5↵ LF

42
11.3. List of commands

out commands: Setting parameters or temperature values.

Command Parameter Response of recirculating cooler

out_mode_05 0 Stop the unit = R –OFF-.
out_mode_05 1 Start the unit.
out_sp_00 xxx.xx Set working temperature

in commands: Asking for parameters or temperature values to be displayed.

Command Parameter Response of recirculating cooler

version none Number of software version (V X.xx)
status none Status message, error message (see page 44 )
in_pv_00 none Actual bath temperature.
in_sp_00 none Working temperature
in_mode_05 none Recirculating cooler in Stop/Start condition:
0 = Stop
1 = Start

43
11.4. Status messages
Status messages Description

00 MANUAL STOP Recirculating cooler in „OFF“ state.

01 MANUAL START Recirculating cooler in keypad control mode.
02 REMOTE STOP Recirculating cooler in „r OFF“ state.
03 REMOTE START Recirculating cooler in remote control mode.

11.5. Error messages

Error messages Description
-01 LOW LEVEL ALARM Low liquid level alarm.
-05 WORKING SENSOR ALARM Working temperature sensor short-circuited or
interrupted.
-03 EXCESS TEMPERATURE High temperature warning. Starting at 75 °C
WARNING (no deactivation)
The return temperature soon reaches the switch-off
value of the high temperature warning function (85 °C)
-07 I2C-BUS ERROR Internal error when reading or writing the I2C bus.
-08 INVALID COMMAND Invalid command.
-09 COMMAND NOT ALLOWED IN Invalid command in current operating mode.
CURRENT OPERATING MODE
-10 VALUE TOO SMALL Entered value too small.

44
Error messages Description
-11 VALUE TOO LARGE Entered value too large.
-12 TEMPERATURE MEASUREMENT Error in A/D converter.
ALARM
-14 EXCESS TEMPERATURE The return temperature is above the switch-off value of
PROTECTOR ALARM the high temperature warning function of 85 °C.
Check dimensioning of application.
Use a stronger recirculating cooler if necessary.

12. Cleaning / repairing the unit

Caution:
Always turn off the unit and disconnect the mains cable from the power source before
cleaning the unit.
Prevent humidity from entering into the circulator.
Electrical connections and any other work must be performed by qualified personnel
only.

Notice:
Risk of injury for hands when mounting the venting grid.

45
 To maintain the full cooling performance, clean the condenser from time to time.

• Switch off the unit, disconnect mains power cable.

• Hold the venting grid, pull out and remove.
• Clean the ribbed condenser with a vacuum cleaner.
• Replace the venting grid.
• Switch on the unit.

Cleaning:
Clean the outside of the unit using a wet cloth and low surface tension water.
The recirculating cooler is designed for continuous operation under normal
conditions. Periodic maintenance is not required.
The tank should be filled only with a bath fluid recommended by JULABO. To
avoid contamination, it is essential to change the bath fluid from time to time.

Repairs:
Before asking for a service technician or returning a JULABO instrument for
repair, please contact an authorized JULABO service station.

46
 When returning the unit:
• Clean the unit in order to avoid any harm to the service personnel
• Attach a short fault description.
• When returning a unit, take care of careful and adequate packing.
• JULABO is not responsible for damages that might occur from insufficient
packing.

JULABO reserves the right to carry out technical modifications with repairs for
providing improved performance of a unit.

13. Adequate storing of operating manual

Store the operating manual at the foreseen place at the unit and lock it by
means of the protection lid (15).

47
14. Draining
Notice:
Store and dispose the used bath fluid according to the laws for environmental
protection.

Risk of injury for hands when mounting the venting grid.

• Turn off the unit and disconnect the mains

cable from the power source.

• Hold the venting grid, pull out and remove.

• Slide a short piece of tube onto the drain
connection (8) and hold it into a container.
• Loosen the drain screw a few turns and drain
the unit completely.
• Close the drain tap and replace the venting
grid.

48
15. 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.com, 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.

49
JULABO GmbH Tel. +49 (0) 7823 / 51-0 info.de@julabo.com
77960 Seelbach / Germany Fax +49 (0) 7823 / 24 91 www.julabo.com

Changes without prior notification reserved Printed in Germany 1.951.4818-V5 08/17

Important: keep original operating manual for future use