English

Operating manual

Recirculating Coolers °C

RS232 ALARM

FL2503 FLW2503 FL2506

FL2506 FLW2506

FL4003 FLW4003
FL4006 FLW4006

JULABO USA, Inc.

884 Marcon Boulevard
Allentown, PA 18109
Phone: +1(610) 231-0250
Fax: +1(610) 231-0260
info @ julabo.com
www.julabo.com

19534829-V1.doc Print date: 02.01.2013

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 18

1.953.4829-V1 01/13 Printed in Germany Changes without prior notification reserved

Important: keep operating manual for future use

2
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................................................................................................ 12
4. Safety notes for the user ............................................................................................................ 13
4.1. Explanation of safety notes ............................................................................................. 13
4.2. Explanation of other notes .............................................................................................. 13
4.3. Safety instructions........................................................................................................... 13
5. Installation .................................................................................................................................. 15
5.1. Tubing ............................................................................................................................. 17
6. Operating controls and functional elements ............................................................................... 18
7. Operating procedures ................................................................................................................. 20
7.1. Bath fluids ....................................................................................................................... 20
7.2. Power connection ........................................................................................................... 20
7.3. Filling............................................................................................................................... 21
7.4. Switching on / Start - Stop .............................................................................................. 21
7.5. Setting the feed pressure ................................................................................................ 22
7.6. Setting the temperatures................................................................................................. 22
7.7. AUTOSTART ON / OFF.................................................................................................. 22
7.8. Remote control: activate – deactivate ............................................................................. 23
8. Safety installations...................................................................................................................... 23
8.1. Excess temperature protection ....................................................................................... 23
8.2. Low level protection ........................................................................................................ 23
9. Troubleshooting guide / Error messages.................................................................................... 24
10. Electrical connections ....................................................................................................... 26
11. Remote control .................................................................................................................. 27
11.1. Setup for remote control ................................................................................................. 27
11.2. Communication with a PC or a superordinated data system .......................................... 27
11.3. List of commands ............................................................................................................ 28
11.4. Status messages ............................................................................................................ 28
11.5. Error messages............................................................................................................... 29
12. Cleaning / repairing the unit .............................................................................................. 30
12.1. JULABO Service – Online remote diagnosis .................................................................. 32
12.2. Draining........................................................................................................................... 33
13. Adequate storing of operating manual .............................................................................. 33
14. WARRANTY PROVISIONS .............................................................................................. 34

3
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  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.

4
If you have any questions concerning the operation of your unit or the information in this manual,
please contact us!

Contact JULABO USA, Inc. Phone: +1(610) 231-0250

884 Marcon Boulevard Fax: +1(610) 231-0260
Allentown, PA 18109 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.

5
1 Warning label W00: Colors: yellow, black
Danger area. Attention! Observe instructions.
(operating manual, safety data sheet)

2 Mandatory label M018: Colors: blue, white

Carefully read the user information prior to beginning operation.
Scope: EU
or
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 refrigerant R404A, which at this time is not considered harmful to the ozone
layer. However, over the long operating period of the unit, disposal rules may change. Therefore, only
qualified personnel should handle the disposal.

6
3. Technical specifications
Recirculating Cooler FL2503 FLW2503
Cooling 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 2.5 1.5 1.2 2.7 1.7 1.0
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, adjustable at 0 Liter bar 0.5 ... 3.0 0.5 ... 3.0
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 24 … 30
Dimensions (WxLxH) cm 60x76x115
Weight kg 146 143
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
Cooling water
Flow rate at 20 °C inlet temperature l/min ----- 4.1
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 11 12
Mains power connection 208 - 220 V/60 Hz V/ Hz 197 - 242 / 60 197 - 242 / 60
Current input at 208V / 220 V A 13 ----

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

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Recirculating Cooler FL2506 FLW2506
Cooling 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 2.5 1.0 0.3 2.5 1.0 0.3
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 60 60
pressure, adjustable at 0 Liter bar 0.5 ... 6.0 0.5 ... 6.0
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 24 … 30
Dimensions (WxLxH) cm 60x76x115
Weight kg 158 160
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
Cooling water
Flow rate at 20 °C inlet temperature l/min ----- 4.1
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 14 15
Mains power connection 208 - 220 V/60 Hz V/ Hz 197 - 242 / 60 197 - 242 / 60
Current input at 208V / 220 V A 16 ------

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

8
Recirculating Cooler FL4003 FLW4003
Cooling 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 4.0 2.4 1.5 4.3 2.2 1.3
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, adjustable at 0 Liter bar 0.5 ... 3.0 0.5 ... 3.0
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 24 ... 30
Dimensions (WxLxH) cm 60x76x115
Weight kg 148 143
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
Cooling water
Flow rate at 20 °C inlet temperature l/min ----- 6.6
IP class according to IEC 60 529 IP 21

Mains power connection 400 V/3PNPE/50 Hz V/ Hz 360-440/3PNPE/50 360-440/3PNPE/50

Current input at 230 V A 8 8
Mains power connection 230 V/3PPE/60 Hz V/ Hz 197-242/3PPE/60 207-253/3PPE/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
Recirculating Cooler FL4006 FLW4006
Cooling 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 4.0 1.9 0.9 4.0 1.7 0.7
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 60 60
pressure, max. at 0 liter bar 0.5 ... 6.0 0.5 ... 6.0
pressure, adjustable at 0 Liter
Feed pressure indication bar Manometer Manometer
Filling level indicator sight glass
Filling volume from ... to liters 24 ... 30
Dimensions (WxLxH) cm 60x76x115
Weight kg 157 160
Ambient temperature range °C 5 ... 40
Return flow temperature °C 80 max.
Cooling water
Flow rate at 20 °C inlet temperature l/min ----- 6.6
IP class according to IEC 60 529 IP 21

Mains power connection 400 V/3PNPE/50 Hz V/ Hz 360-440/3PNPE/50 360-440/3PNPE/50

Current input at 230 V A 12 13
Mains power connection 230 V/3PPE/60 Hz V/ Hz 197-242/3PPE/60 207-253/3PPE/60
Current input at 208V / 220 V A 16 ------

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 atmosphere

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 to 6 bar
Flow rate on FLW250x typical 4,1 l/min
Flow rate on FLW400x typical 6,6 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.

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.
 Avoid sharp bends in the tubing, and maintain a sufficient distance from

13
 surrounding walls.
 Make sure that the tubing is securely attached.
 Regularly check the tubing for material defects (e.g., for cracks).
 Never operate damaged or leaking equipment.
 Always turn off the unit and disconnect the mains cable from the power source
before performing any service or maintenance procedures, or before moving the
unit.
 Always turn off the unit and disconnect the mains cable from the power source
before cleaning the unit.
 Always empty the bath before moving the unit.
 Transport the unit with care.
 Sudden jolts or drops may cause damage in the interior of the unit.
 Observe all warning labels.
 Never remove warning labels.
 Never operate equipment with damaged mains power cables.
 Repairs are to be carried out only by qualified service personnel.

 Risk of injury for hands. Close cover carefully.

Notice:
Recommendation in case of single-phase current supply (e.g. FL250x):
The safety cutouts of the house wiring should have the trait „C“ (C16A).

WARNING
This product contains chemicals known to the state of California to cause cancer, birth
defects or other reproductive harm.

14
5. Installation
 Place the unit on an even surface on a base made of nonflammable
material. Using the castors (10a, 10b) move the unit to the intended
location.
For better stability, apply the holding breaks on the front casters (10a).
 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. (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 0.52 kg of refrigerant R-404A, 1 m3 of space is required.

Rear view Example: FL2503  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.
min
– Return - Feed

 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“.
IN OUT

 Turn the adjusting valve (13) counter-clockwise to set

the lowest manometric pressure.

 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.

 Only water cooled models - FLW:

Example: Ensure circulation of cooling water by connecting the
OUT PVC-tubing
tubing to cooling water inlet (IN)and outlet (OUT) on
the rear (18) of the recirculating cooler.
IN

Cooling water see page 12.

12 mm inner dia. Cooling water connectors G3/4" external thread
Tubing 12 mm inner dia. tubing
IN Cooling water inlet
OUT Cooling water outlet

15
 Even high quality heat exchangers as they are installed in our equipment can be
damaged by unsuitable cooling water.
The quality of the cooling water depends on the local conditions.
The heat exchanger may become leaky due to corrosion or it may become clogged due
to particulate matter

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

8 970 454 Shut-off valve G ¾“ FL(W) 2503/4003
8 970 458 Shut-off valve G 1¼“ FL(W) 2506/4006

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.

16
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
8930319 1 m Reinforced tubing ¾“ inner dia. (-40 ... +120°C) FL(W) 2503/4003
8930325 1 m Reinforced tubing 1“ inner dia. (-40 ... +120°C) FL(W) 2506/4006

Tubing insulation
8930419 1 m Insulation, 29 mm inner dia. Reinforced tubing ¾“ inner dia.
8930425 1 m Insulation, 35 mm inner dia. Reinforced tubing 1“ inner dia.

Tube clamps
8970483 2 Tube clamps, size 4 Reinforced tubing ¾“ inner dia.
8970484 2 Tube clamps, size 5 Reinforced tubing 1“ inner dia.

17
6. Operating controls and functional elements
Example: FL25xx Front view Rear view
4 3 2 1
°C

RS232 ALARM

6 FL2506 13
7 14
8 IN OU T

15
9 16
17

18
OUT

IN

10a 10b
11

Top view

Push

12 4 Protection lid for fill in opening

12 Protection lid for storing place of

operating manual
Push

°C

Lifting device for transportation by crane

1 ON Mains power switch

18
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 Feed pressure indication: Manometer
6 Interface RS232: remote control via personal computer
RS232
7 Alarm output (for external alarm signal)

8 Filling level indication

9 Drain tap with drain port
10a Castor with brake (at the front)
10b Castor without brake (at the back)
11 Venting grid, removable
12 Protection lid for storing place of operating manual
13 Feed pressure adjusting valve
14 Pump connector OUT – pressure pump
Pump connector IN– Return
FL/FLW2503 G ¾“ außen
FL/FLW4003 G ¾“ außen
FL/FLW2506 G 1¼“
FL/FLW4006 G 1¼“
15 Overflow connector

16 Mains circuit breakers (resettable) FL250x

2 Mains circuit breakers (resettable) 4 A (for Electronics)
2 Mains circuit breakers (resettable) 10 A (for Pump motor)
F1, F2, F3, F4
16 Mains circuit breakers (resettable) FL400x
1 1 Motor protection switch for compressor motor
0 2 Mains circuit breakers (resettable) 4 A (for Electronics)
F1, F2, F3, F4 2 Mains circuit breakers (resettable) 10 A (for Pump motor)
17 Mains power cable with plug
18 OUT Only water cooled models
IN Cooling water inlet
OUT Cooling water outlet
IN
G3/4" external thread
12 mm inner dia. tubing

19
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.
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

7.2. Power connection

Caution:
 Only connect the unit to a power socket with earthing contact (PE – protective earth)!
 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).
We disclaim all liability for damage caused by incorrect line voltages!

Recommendation in case of single-phase current supply (e.g. FL250x):

The safety cutouts of the house wiring should have the trait „C“ (C16A).

Make sure that the line voltage and frequency match the supply voltage specified on the
type plate.

20
7.3. Filling
Notice:

Risk of injury for hands. Close cover carefully.

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 14 to page 17!

 Check to make sure that the drain tap (9) is closed.
Push

 Unlock and open lid of fill in opening (4) by slightly

pushing.


°C

Fill in tempering fluid up to marking „H“ of the filling level

indicator.

H  Turn the mains switch (1) on (Switching on - see page 21)

 Switch on unit. To do so press button for approx. 4 seconds.
L  Tempering fluid is pumped into the externally connected system.
Refill fluid up to marking „H“.
 The recirculating cooler is ready for operation.

7.4. Switching on / Start - Stop

ON 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) (FL2506)

 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: 1. Press enter for about 4 seconds.
2. Wait until the LED display stops blinking!
3. Turn the unit off with the mains power switch.

21
7.5. Setting the feed pressure
Set the max. permissible feed pressure (example: 2 bar) by slowly
closing the adjusting valve (13) on the rear and looking at the
manometer (5).
max.
 The max. pressure is determined by the weakest element in the
circuit (e. g. glass equipment).

7.6. Setting the temperatures

Factory setting: 25 °C  Setting 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.

7.7. 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.
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.

22
7.8. 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
(Interface OFF) wait approx. 5 seconds.
 Keep depressed the keys and enter simultaneously and
(Interface On) turn on the unit with the mains power switch.
>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.

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.

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.

23
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

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.

 The motor protection switch for the compressor motor is off. Set motor
protection switch to >1< . Check the fuses.
 The pressure sensor of low pressure side (evaporation pressure) is faulty,
short-circuited or has a line interruption.
Have the repair done by a specialist.

 The motor protection switch for the compressor motor is off. Set motor
protection switch to >1< . Check the fuses.
 The pressure sensor of high pressure side is faulty, short-circuited or has a
line interruption.
Have the repair done by a specialist.

The suction gas temperature sensor is faulty, short-circuited or has a line

interruption.
Have the repair done by a specialist.

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.

24
 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 30)

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.

Mains circuit breakers (resettable) FL250x

2 Mains circuit breakers (resettable) 4 A (for Electronics)
2 Mains circuit breakers (resettable) 10 A (for Pump motor)
F1, F2, F3, F4
Mains circuit breakers (resettable) FL400x
1 1 Motor protection switch for compressor motor
0 2 Mains circuit breakers (resettable) 4 A (for Electronics)
F1, F2, F3, F4 2 Mains circuit breakers (resettable) 10 A (for Pump motor)

25
10. Electrical connections
Notice: Use shielded cables only.
The shield of the connecting cable is electrically connected to the plug housing.
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 RS232:

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

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. 1A

26
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

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).

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

27

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

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 28 )
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

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.

28
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 WARNING High temperature warning. Starting at 75 °C
(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.

-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.
-20 WARNING: CLEAN CONDENSOR OR Cooling of the condenser is affected. Clean air-cooled
CHECK COOLING WATER CIRCUIT condenser.
OF REFRIGERATOR Check the flow rate and cooling water temperature on
water-cooled condenser.
-51 PRESSURE SENSOR ALARM LOW  The motor protection switch for the compressor
PRESSURE SIDE motor is off. Set motor protection switch to >1< .
Check the fuses.
 The pressure sensor of low pressure side
(evaporation pressure) is faulty, short-circuited or
has a line interruption.
Have the repair done by a specialist.
-52 PRESSURE SENSOR ALARM HIGH  The motor protection switch for the compressor
PRESSURE SIDE motor is off. Set motor protection switch to >1< .
Check the fuses.
 The pressure sensor of high pressure side is
faulty, short-circuited or has a line interruption.
Have the repair done by a specialist.
-53 SUCTION GAS TEMPERATURE The suction gas temperature sensor is faulty, short-
SENSOR ALARM circuited or has a line interruption.
Have the repair done by a specialist.

29
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.
Service and repair work may be performed only by authorized electricians.

Notice:

Risk of injury for hands when mounting the venting grid.

Maintaining the cooling performance

Air cooled models = FL

°C

RS232 ALARM

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.

Water cooled models = FLW

In order to maintain a good condition of the cooling compressor,
the sieve in the cooling water input should be cleaned in regular
OUT intervals.

IN  Switch the unit off, disconnect the power plug.

 Interrupt the cooling water input.
 Disconnect the tubing from the nozzle „IN“ and take out the
dirty sieve.
 Clean the sieve.
 Put in the sieve and reconnect the tubing.
 Open the cooling water input.
 Take care the tubing connection is not leaking.
 The unit is ready to operate again.

30
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.

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.
 During transport the unit has to stand upright. Mark the
packing correspondingly.
 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.

31
12.1. JULABO Service – Online remote diagnosis
JULABO circulators of the HighTech series are equipped with a
black box. This box is implemented in the controller and records
all significant data for the last 30 minutes.
In case of a failure, this data can be read out from the unit by
using special software. This software is available as a free
download from www.julabo.com \ EasyBlackBox.
 Installation is easy and is performed step by step.
Please observe the instructions.

 Data read-out is possible in the conditions

“OFF”, “R OFF” or “ALARM”.
 Connect the circulator to the computer using an interface
cable.
 Start the EasyBlackBox program.
The program asks for the port used (COM1, ......) and the baud
rate of the unit.
You do not have this information on hand? Simply try it out!
The program continues to send the request until the correct
settings are made.

 Data is read out and shown on the monitor

divided in the sections
>Einstellungen/Settings<,
>Alarmspeicher/Alarms stored<,
>Blackbox<

 see example

 After pressing >Speichern/Save< a text file is

compiled. The program proposes a filename -
>C:\model description and barcode no.<.
Modifications are possible.
 E-mail this file to ServiceUSA@Julabo.com,
JULABO's service department. JULABO is thus
able to provide rapid support.

32
12.2. 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.

°C °C

 Turn off the unit and disconnect the

RS232 ALARM RS232 ALARM

mains cable from the power source.

 Hold the venting grid, pull out and

remove.

 Slide a short piece of tube onto the

drain port and hold it into a pail.

 Open the drain tap and empty the

unit completely.

 Close the drain tap and replace the

venting grid.

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 (18).

33
14. WARRANTY PROVISIONS

The following Warranty Provisions shall apply to products sold in North America by Julabo (“Seller”) to the entity
shown as buyer (“Buyer”) on Seller’s invoice.

1. Initial Warranty. Upon Seller’s receipt of payment in full for the products and subject to Buyer’s
compliance with the terms of sale and any other agreement with Seller relating to the products, Seller warrants to
the Buyer that the products manufactured by the Seller are free from defects in material and workmanship for a
period not to exceed two (2) years or ten thousand (10,000) hours of operation, whichever comes first, from the
date the product is shipped by Seller to Buyer (the “Initial Warranty”).

2. EXCLUSION OF ALL OTHER EXPRESS WARRANTIES; EXCLUSION OF ALL IMPLIED

WARRANTIES. OTHER THAN THE INITIAL WARRANTY, NO OTHER EXPRESS WARRANTIES ARE MADE.
ALL IMPLIED WARRANTIES OF EVERY TYPE AND KIND, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE, ARE
EXCLUDED IN ALL RESPECTS AND FOR ALL PURPOSES. SELLER DISCLAIMS AND MAKES NO IMPLIED
WARRANTIES WHATSOEVER.

3. Exclusions. The Initial Warranty does not include damage to the product resulting from
accident, misuse, improper installation or operation, unauthorized or improper repair, replacement or alteration
(including but not limited to repairs, replacements, or alterations made or performed by persons other than Seller’s
employees or authorized representatives), failure to provide or use of improper maintenance, unreasonable use or
abuse of the product, or failure to follow written installation or operating instructions. Buyer must return the
product’s record of purchase to the Seller or one of Seller’s authorized representatives within thirty (30) days of the
date the product is shipped by Seller to Buyer in order to make a claim under the Initial Warranty. Notwithstanding
anything contained herein to the contrary, all glassware, including but not limited to reference thermometers, are
expressly excluded from the Initial Warranty.

4. Buyer’s sole remedies; Limitations on Seller’s Liability. Buyer’s sole and exclusive remedy
under the Initial Warranty is strictly limited, in Seller’s sole discretion, to either: (i) repairing defective parts; or (ii)
replacing defective parts. In either case, the warranty period for the product receiving a repaired or replaced part
pursuant to the terms of the Initial Warranty shall not be extended. All repairs or replacements performed by Seller
pursuant to these Warranty Provisions shall be performed at Seller’s facility in Allentown, Pennsylvania, U.S.A. or
Vista, California, U.S.A or at the facility of an authorized representative of Seller, which location shall be
determined by Seller in its sole discretion; provided, however, that Seller may, in its sole discretion perform such
repairs or replacements at Buyer’s facility in which case Buyer shall pay Seller’s travel, living and related expenses
incurred by Seller in performing the repairs or replacements at Buyer’s facility. As a condition precedent to Seller’s
obligation to repair or replace a product part under the Initial Warranty, Buyer shall (i) promptly notify Seller in
writing of any such defect; (ii) shall have returned the product’s record of purchase to Seller or to one of Seller’s
authorized representatives within thirty (30) days of the date the product is delivered to Buyer; and (iii) assist Seller
in all respects in its attempts to determine the legitimacy and basis of any claims made by or on behalf of Buyer
including but not limited to providing Seller with access to the product to check operating conditions. If Buyer does
not provide such written notice to Seller within the Initial Warranty period or fails to return the product’s record of
purchase as set forth above, Seller shall have no further liability or obligation to Buyer therefore. In no event shall
Seller’s liability under the Initial Warranty exceed the original purchase price of the product which is the subject of
the alleged defect.

5. THE REMEDIES PROVIDED IN THE INITIAL WARRANTY ARE THE SOLE AND EXCLUSIVE
REMEDIES AVAILABLE TO THE BUYER. NOTWITHSTANDING ANYTHING TO THE CONTRARY
CONTAINED HEREIN, AND EVEN IF THE SOLE AND EXCLUSIVE REMEDIES FAIL OF THEIR ESSENTIAL
PURPOSE FOR ANY REASON WHATSOEVER, IN NO EVENT SHALL SELLER BE LIABLE FOR BUYER’S
MANUFACTURING COSTS, LOST PROFITS, GOODWILL, OR ANY OTHER SPECIAL, INDIRECT, PUNITIVE,

34
INCIDENTAL OR CONSEQUENTIAL DAMAGES TO BUYER OR ANY THIRD PARTY AND ALL SUCH
DAMAGES ARE HEREBY DISCLAIMED.

6. Assignment. Buyer shall not assign any of its rights or obligations hereunder without the prior
written approval of Seller; provided, however, that if Buyer is a distributor of Seller, the rights and obligations of Buyer
under these Warranty Provisions shall inure to the benefit of and be binding upon Buyer’s customers who provide the
product’s proof of purchase to Seller pursuant to the terms set forth herein. Seller may assign any or all of its rights or
obligations hereunder without Buyer’s prior consent.

7. Governing Law. The Warranty Provisions and all questions relating to their validity, interpretation,
performance, and enforcement shall be construed in accordance with, and shall be governed by, the substantive laws
of the Commonwealth of Pennsylvania without regard to its principles of conflicts of law.

8. Waiver. Any failure of the part of Seller to insist on strict compliance with the Warranty Provisions
shall no way constitute a waiver of such right. No claim or rights arising out of a breach of the Warranty Provisions by
Buyer may be discharged in whole or in part by a waiver of the claim or right, unless the waiver is in writing signed by
an authorized representative of Seller. Seller’s waiver or acceptance of any breach by Buyer of any provisions of the
Warranty Provisions shall not constitute a waiver of or an excuse for nonperformance as to any other provision of the
Warranty Provisions nor as to any prior or subsequent breach of the same provision.

9. Freight. Buyer will arrange and pay for shipping and handling charges for the unit to be returned to
the Seller.Seller will arrange and pay for shipping and handling for the return of the unit to the Buyer.

35