Julabo FL1201 User manual

English
Operating manual
Recirculating Coolers
FL1201
FL1203
FL1701 FLW1701
FL1703 FLW1703
RS232 ALARM
FL1203
Changes without prior notification reserved
Printed in Germany
1.951.4822 BE5 06/08 Druck: 25.06.2008
Innovative Temperature Technology
JULABO Labortechnik GmbH
77960 Seelbach / Germany
+49 (0) 7823 / 51-0
+49 (0) 7823 / 24 91
|[email protected]
Þwww.JULABO.de
19514822_FL12xx_FL17xx.doc

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 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.
EC Conformity
The products described in the operating instructions conform to the requirements of
the following European guidelines:
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 Labortechnik GmbH
Eisenbahnstr. 45
77960 Seelbach / Germany
Quality Management System
ISO 9001
2000
W
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a
r
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i
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The JULABO Quality Management System:
Development, production and distribution of temperature application instruments for
research and industries conform to the requirements according to
DIN EN ISO 9001:2000.
Certificate Registration No. 01 100044846

3
TABLE OF CONTENTS
1. Use according to intended purpose.............................................................................................. 4
2. Operator responsibility – Safety recommendations...................................................................... 4
2.1. Handling............................................................................................................................ 4
2.2. Use.................................................................................................................................... 5
2.3. Disposal............................................................................................................................ 5
3. Technical specifications................................................................................................................ 6
3.1. Warning functions and safety installations........................................................................ 9
3.2. Cooling water.................................................................................................................... 9
4. Safety notes for the user ............................................................................................................ 10
4.1. Safety recommendations................................................................................................ 10
5. Unpacking and checking ............................................................................................................ 10
6. Installation .................................................................................................................................. 11
6.1. Tubing............................................................................................................................. 12
7. Operating controls and functional elements............................................................................... 13
8. Operating procedures................................................................................................................. 15
8.1. Bath fluids....................................................................................................................... 15
8.2. Power connection ........................................................................................................... 16
8.3. Filling............................................................................................................................... 16
8.4. Switching on / Start - Stop .............................................................................................. 17
8.5. Setting the feed pressure................................................................................................ 17
8.6. Setting the temperatures................................................................................................. 17
8.7. AUTOSTART ON / OFF.................................................................................................. 18
8.8. Remote control: activate – deactivate............................................................................. 18
9. Safety installations...................................................................................................................... 19
9.1. Excess temperature protection....................................................................................... 19
9.2. Low level protection........................................................................................................ 19
10. Troubleshooting guide / Error messages.......................................................................... 19
11. Electrical connections ....................................................................................................... 21
12. Remote control.................................................................................................................. 21
12.1. Setup for remote control.................................................................................................... 21
12.2. Communication with a PC or a superordinated data system............................................. 22
12.3. List of commands .............................................................................................................. 23
12.4. Status messages............................................................................................................... 23
12.5. Error messages................................................................................................................. 23
13. Maintaining the cooling performance................................................................................ 24
14. Adequate storing of operating manual.............................................................................. 24
15. Cleaning / repairing the unit.............................................................................................. 25
15.1. Draining............................................................................................................................. 26
16. Warranty conditions .......................................................................................................... 27

4
1. Use according to intended purpose
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.
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).
JULABO recirculating coolers are not conceived for direct temperature application to
food and luxury articles or pharmaceutical and medico-technical products. Direct
temperature application means: Unprotected contact of the object with the bath
medium (bath fluid).
2. Operator responsibility – Safety recommendations
The products of JULABO Labortechnik GmbH warrant a safe operation if installation, operation and
maintenance is carried out according to common safety regulations. This section informs you about
potential dangers that may arise from operating the recirculating cooler and also mentions the most
important safety precautions.
The operator is responsible for the qualification of the personnel operating the units.
The operator should be constantly informed about the dangers involved with their job activities as well
as preventive actions.
Make sure all persons expected to carry out operation, installation and maintenance of the unit read
and understand the safety information and operating instructions.
When using hazardous materials, the circulator may only be operated by persons that are absolutely
familiar with these materials and the circulator. These persons must be fully aware of possible risks.
If you have any questions concerning the operation of your unit or the information in this manual,
please contact us!
Contact JULABO Labortechnik GmbH
Eisenbahnstraße 45
77960 Seelbach / Germany
[phone] |[email protected]
[phone] Þwww.JULABO.de
2.1. Handling
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.

5
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 recirculating cooler. Untrained personnel should be instructed by trained personnel.
2.2. 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 10).
The recirculating coolers are not for use in explosive atmosphere
When using hazardous materials, the user must attach the enclosed safety labels to the front of the
unit so they are well visible.
Warning label W00:
Colors:
yellow, black
Danger area.
Attention! Observe instructions.
(operating manual, safety data sheet)
Mandatory label M018
Colors: blue, white
Carefully read the user information prior to beginning
operation
Scope: EU
Semi S1-0701
Table A1-2 #9
Carefully read the user information prior to beginning
operation
Scope: NAFTA
Observe the instructions in the manuals for instruments of a different make that you connect to the
circulator, particularly the respective safety recommendations. Also observe the pin assignment of
plugs and technical specifications of the products.
2.3. 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:
Directive 2002/96/EC of the European Parliament and of the Council of 27 January
2003 on waste electrical and electronic equipment (WEEE).
This directive requires electrical and electronic equipment marked with a
crossedout 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!

6
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 °C +20 0 -10 +20 0 -10
Medium: Mixture water-glycol kW 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

7
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 °C +20 0 -10 +20 0 -10
Medium: Mixture water-glycol kW 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 76 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
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 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 ---- ----
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

8
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 °C +20 0 -10 +20 0 -10
Medium: Mixture water-glycol kW 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
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 12 11
Mains power connection 208 - 220 V/60 Hz V/ Hz 197 - 242 / 60 197 - 242 / 60
Current input at 208V / 220 V A 11 ----
All measurements have been carried out at: rated voltage and frequency,
ambient temperature: 20 °C

9
3.1. 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 (for storage and transportation)
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
Power supply: corresponds to Class I; according to VDE 0106 T1
Not for use in explosive atmosphere
Overvoltage category II
Pollution degree 2
3.2. Cooling water
Only for water cooled models - FLW:
Cooling water pressure (IN / OUT ) max. 4,5 bar
Difference pressure (IN - OUT ) 2 bar bis 4,5 bar
Flow rate typical 2,8 l/min
Cooling water temperature 20 °C
Quality of cooling water:
pH at 25 °C 7 to 8.5
Suspended matter <30 mg/l
Size of suspended matter max. 0.1 mm
Growth of algae not permissible

10
4. Safety notes for the user
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 described according to an alarm keyword.
Read and follow these important instructions.
Warning:
Describes a possibly highly dangerous situation. If this is not avoided, 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 damage can 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.
4.1. Safety recommendations
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)!
•Place the instrument on an even surface on a pad made of non-inflammable
material.
•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).
•Employ suitable connecting tubing.
Make sure that the tubes are securely attached.
•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 empty the bath before moving the unit.
•Never operate equipment with damaged mains power cables.
•Risk of injury for hands. Close cover carefully.
5. Unpacking and checking
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 13

11
6. Installation
Rear view:
•Place the unit on an even surface on a pad made of non-flammable
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 radiates to the environment. (Max.
permissible ambient temperature: 40 °C).
With regard to a disturbance in the cooling loop
(leakage), the guideline EN 378 prescribes a certain
room space to be available for each kg of refrigerant.
> For 0.48 kg of refrigerant R404A, a room space of 1
m3 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 9.
Cooling water connectors G3/4" external thread
Tubing 12 mm inner dia. tubing
IN Cooling water inlet
OUT Cooling water outlet

12
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.
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.
6.1. 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 12 mm 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.

13
7. 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

14
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

15
Top view
Push
Push
4
1
8
4Protection lid for fill in opening
18 Protection lid for storing place of
operating manual
8. Operating procedures
8.1. Bath fluids
Caution:
No liability for use of other bath liquids!
Do not use alcohols.
Water:
The quality of water depends on local conditions. Ferrous water can cause corrosion -
even on stainless steel. Chloric water can cause pitting corrosion.
Water: - No liablity for use with water.
Danger of freezing at working temperatures <5 °C.
Mixture water -glycol:
Strictly observe the safety data and handling instructions from the manufacturer.
The proportion of water might evaporate by and by. Check the mixing ratio regularly and
refill water if necessary.
Recommended bath fluids:
Bath fluids Temperature range
Julabo Thermal G -30 °C ... 80 °C
mixture water/glycol (50:50) -30 °C ... 50 °C
water +5 °C ... 80 °C

16
Order No. Desription Quantity
8 940 124
8 940 125 JULABO Thermal G JULABO Thermal G 10 liters 5 liters
Notice:
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
8.2. 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!
Check to make sure that the line voltage matches the supply voltage specified on the
identification plate.
8.3. 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 10 to page 12!
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 17)
•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.

17
8.4. 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.
8.5. 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).
8.6. 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.

18
8.7. 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.
8.8. Remote control: activate – deactivate
(Interface OFF)
(Interface On)




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.
•Keep depressed the keys and enter simultaneously and
turn on the unit with the mains power switch.
>I OFF< No remote control via RS232 (Factory setting)
>I On< Remote control via RS232
LThe 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.

19
9. Safety installations
9.1. Excess temperature protection
+8
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".
9.2. Low level protection
+8
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".
LTurn 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.
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.
10. Troubleshooting guide / Error messages
+8Whenever 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.

20
Error in A/D converter
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).
Cooling of the condenser is affected. (see page 24)
•Clean air-cooled condenser.
•Check the flow rate and cooling water temperature on water-cooled
condenser.
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.
Fuses:
The mains fuses on the rear of the unit may easily be exchanged as shown on
the left.
Fine fuses –16 A (230 V unit)
Fine fuses –20 A (115 V unit)
Warning:
Before exchanging the fuses, turn off the mains power switch and disconnect the
power plug from the mains socket!
Only use fine fuses with a nominal value as specified.
Example:
Manufacturer Supplier Type Order No.
Schurter Schurter G-fuse insert SPT T16 A
5x20mm No. 0001.2516
Schurter Schurter G-fuse insert
T20,0 A 5x20 mm No. 0034.3130