Operating Instructions
Read and observe these Operating Instructions!
Recirculating Cooler
C 900
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Tel. +49 (0)7664 / 5909-0
Fax +49 (0)7664 / 5909-99
E-mail: info@knf.de
www.knf.de
KNF 301425-301429 03/14
Translation of original Operating Instructions, English Keep for future reference!
Contents Page
1. About this document .................................................................. 3
2. Intended use .............................................................................. 4
3. Operator responsibility – Safety precautions ............................ 5
4. Handling .................................................................................... 6
5. Technical data ........................................................................... 8
6. Safety precautions ................................................................... 11
7. Transportation, setup, and connection .................................... 14
8. Operating and functional elements ......................................... 17
9. Initial start-up ........................................................................... 19
10. Protective features .................................................................. 25
11. Troubleshooting guide / Alarm messages ............................... 26
12. Cleaning / repairing the unit .................................................... 28
13. Accessories ............................................................................. 30
14. Returns .................................................................................... 31
15. Health and safety clearance and decontamination form ......... 32
Recirculating Cooler C 900 About this document
is essential for safe
1. About this document
The Operating Instructions are an integral part of the recirculating
cooler.
Carefully read the Operating Instructions before bringing the
recirculating cooler into operation.
Keep the Operating Instructions readily accessible at all times.
Pass on the Operating Instructions to the next owner.
Compliance with the Operating Instructions
and reliable operation of the recirculating cooler. Failure to
observe the Operating Instructions may result in damage or
injury.
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 3
Intended use Recirculating Cooler C 900
2. Intended use
The KNF Recirculating Cooler is designed to control the temperature of certain liquid media.
External pump connections enable constant-temperature cooling of
applications in an external loop.
This recirculating cooler is operated via the splash-proof mem-
brane keypad. Microprocessor technology enables adjustment,
display, and storage of the setpoint through the LED temperature
display.
The PID temperature regulation is used to withdraw heat from the
PID1
heat transfer liquid by means of the cooling apparatus and to
automatically regulate the required need.
Health hazards associated with the heat transfer
liquid
KNF recirculating coolers are not intended for
NOTE
Direct temperature control means:
Unprotected contact of the object with the bath medium (heat
transfer liquid).
direct temperature control of food and luxury articles, pharmaceutical products, or medical devices.
4 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Operator responsibility – Safety precautions
3. Operator responsibility – Safety precautions
The products of KNF Neuberger GmbH ensure safe operation
when installed, operated, and maintained according to common
safety regulations. This section explains the potential dangers that
may arise when operating the recirculating cooler 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 person-
nel operating the units.
Make sure that the persons who operate the recirculating
cooler are trained in this work.
The personnel operating the units should be regularly instruct-
ed 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 understood the safety information and Operating Instructions.
When using hazardous materials or materials that could be-
come hazardous, the recirculating cooler may be operated only
by persons who have complete familiarity with these materials
and the recirculating cooler. 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 (see final page for
telephone number)!
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Handling Recirculating Cooler C 900
4. Handling
Avoid strikes to the housing, vibrations, damage to the keypad
(keys, display), and heavy contamination.
Make sure the product is regularly checked for proper condition
(depending on the conditions of use).
Regularly check (at least every 2 years) the condition of the
mandatory, warning, prohibition and safety labels.
Make sure that the mains power supply has low impedance to
avoid any negative effects on instruments being operated on
the same mains.
This unit is designed for operation in a controlled electromag-
netic environment. Accordingly, transmitting devices such as
mobile telephones shall not be used in the immediate vicinity.
Other devices with magnetically sensitive components, such as
a monitor, may be influenced by magnetic radiation. We recommend maintaining a minimum distance of 1 m.
Permissible ambient temperature: max. 40 °C, min. 5 °C.
Permissible relative humidity: 50% (40 °C).
Do not store the unit in an aggressive atmosphere. Protect the
unit from contamination.
Do not expose the unit to sunlight.
4.1. Appropriate operation
Only qualified personnel are authorized to perform configuration,
installation, maintenance and repairs of the recirculating cooler.
The operator of the cooler must be trained by technical personnel.
4.2. Use
Ignition of potentially explosive mixtures
The unit is not for use in a potentially explosive
atmosphere.
DANGER
Special materials specifications (heat transfer liquids) must be
observed in order to comply with the intended use. Neither corrosive nor corrosive-acting heat transfer liquids may be used. Observe all warnings for the used materials (heat transfer liquids) and
the respective instructions (safety data sheets).
Provide for adequate ventilation at the place of installation (see
Page 14).
When using hazardous materials or materials that could become
hazardous, the operator must affix the enclosed safety labels (1 +
2) to the front of the unit so they are highly visible:
6 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Handling
with a crossed
1
2a
or
2b
Tab. 1
Warning of a danger area.
Attention!
Please observe the documentation. (Operating
Instructions, safety data sheet)
Carefully read the user information prior to
switching on the unit.
Area of applicability: EU
Carefully read the user information prior to
switching on the unit.
Area of applicability: United States, NAFTA
4.3. Disposal
This unit contains the refrigerant R134a – at this time considered
not to have any negative effects on the ozone layer. However,
during the long operating period of the unit, disposal regulations
may change. Therefore, only qualified personnel shall perform
disposal.
Area of applicability: EU nations
See the current official journal of the European Union – WEEE
directive.
Directive of the European Parliament and of the Council on Waste
Electrical and Electronic Equipment (WEEE).
This directive requires electrical and electronic equipment marked
-out trash can to be disposed of separately in an
environmentally friendly manner.
Please contact an authorized disposal company in your country.
Disposal with household waste (unsorted waste) or through similar
facilities for collecting community waste is not permitted!
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Technical data Recirculating Cooler C 900
60
90
180
210
220
240
250
−−+++
+
5. Technical data
5.1. C 900
Recirculating Cooler
Working temperature range -10 °C to +40 °C
Temperature stability ±0.5 °C
Temperature selection: digital
locally via keypad LED DISPLAY
Temperature indication: LED DISPLAY
Adjustment and display
resolution
Temperature control PID 1
Working temperature sensor
High temperature cut-off 85 °C - fixed value
Low-liquid-level protection Float switch
Circulating pump
0.1 °C
Pt 100
Flow rate [l/min]
max. at 0 bar
Pressure [bar]
max. at 0 liter
15
0.35
Fill level indicator Sight glass
Fill volume [liter]
from ... to
1.7 ... 2.6
Dimensions [mm] (WxDxH) 240 x 400 x 520
Weight [kg] 27.0
Permissible ambient tempera-
5 ... 40
ture range [°C]
Permissible return tempera-
max. 80
ture [°C]
single-stage / air-cooled refrigeration compressor
Refrigerant R134a
Cooling capacity [°C/W]
at 115 V / 60 Hz
at 230 V / 50 Hz
Medium: Water-glycol mixture
20
;
;
10
15
Electrical data
5
;
;
;
;
10
5
0
Power supply 230 V / 50 Hz 207-253 V / 50 Hz
Operating current [A] (at 230 V) 3.0
Power supply 115 V / 60 Hz 115 V / 60 Hz
Operating current [A] (at 115 V) 4.4
Tab. 2
All measurements taken at rated voltage and frequency
Ambient temperature 20 °C
8 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Technical data
5.2. Warning and safety precautions
Warning and safety precautions
Standards
High temperature cutoff, fixed value
Low-liquid-level protection
Alarms optical + audible (permanent)
Overload protection for cooling machine and pump motor
Classification according
to DIN 12876-1
Tab. 3
Ambient conditions according to EN 61 010-1:
For indoor use only.
Up to 2000 m elevation – Standard zero
Ambient temperature: +5 ... +40 °C
Humidity:
Max. relative humidity 80% for temperatures up to +31 °C,
linear decrease down to 50% relative humidity at a temperature of +40 °C
Voltage fluctuations of ±10% are permissible.
85 °C
Float switch
Class I
The recirculating cooler meets the safety stipulations of Directive
2004/108/EC for electromagnetic compatibility, Directive
2006/42/EC for machines, and Directive 2011/65/EU (RoHS2). The
following harmonized standards are fulfilled:
EN 61010-1
EN 61010-2-010
EN 61326-1
EN 378-1/2/3/4
The recirculating cooler complies with the following according to
IEC 664:
Protection class I
Overvoltage category II
Contamination level 2
Ignition of potentially explosive mixtures
The unit is not for use in potentially explosive
atmospheres.
DANGER
EMC requirements:
This unit is an ISM device of Group 1 (using high frequency for
internal purposes) and is categorized in Class A (industrial and
commercial field).
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 9
Technical data Recirculating Cooler C 900
5.3. Materials used on liquid-contacting parts
Description Material
PVC tube
(liquid level indicator)
Plug PA
Reservoir, all components 1.4404, 1.4301, 1.4435
Screw plug 1.4571
Profile gasket Silicone, white
Upper filler neck PVC
Stopper POM
O-ring CR11-70 (Chloroprene rubber)
Motor mounting plate
Motor plate 1.4301
Pump 1.4301, 1.4401, PPS (Rytone)
Sensors 2xPt100 metal
Installation
Float switch 1.4301, PP
Hose fitting CuZn39Pb3 (nickel plated)
Tab. 4
PVC
1.4571
10 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Safety precautions
It also indicates the possible consequences of failure
Here you will see actions for avoiding the danger
6. Safety precautions
6.1. Explanation of safety precautions
Warning
This symbol indicates a potential danger.
to observe the warning. The signal word (e.g. "Warn-
WARNING
Danger levels
Signal word Meaning Consequences if not observed
DANGER
WARNING
CAUTION
NOTE
Tab. 5
6.2. Explanation of other notes
ing") indicates the level of danger.
and potential consequences.
warns of immediate danger
warns of potential
danger
warns of a potentially dangerous
situation
warns of a potentially harmful
situation
Consequences are death or
serious injury and/or serious
property damage
Death or serious injury and/or
serious damage to property are
possible
Minor injury or damage to property are possible
Damage to the system or something in your surroundings
This indicates a required activity (step).
1. This indicates the first step of a required activity. Additional
consecutively numbered steps follow.
This symbol indicates important information.
6.3. Safety instructions
To avoid personal injury and property damage, it is important to
follow the safety instructions. These instructions supplement workplace safety regulations.
Connect the unit only to a mains power socket with
ground contact (PE – protective earth)!
These tasks may be performed only by expert personnel.
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 11
Safety precautions Recirculating Cooler C 900
Make sure that the tubing is secured against
The mains plug serves as a safe disconnect-
ing device from the power supply and must
be always easily accessible.
Install the unit on an even surface on a pad
made of non-inflammable material.
Read and understand the Operating Instruc-
tions before initial operation.
Never operate the unit without bath fluid!
Do not drain the heat transfer liquid while
hot!
Check the temperature of the heat transfer
liquid prior to draining, e.g. by briefly switching the unit on.
Use suitable temperature-control tubing.
slipping.
Avoid kinks in the tubing.
Regularly check the tubing for material fa-
tigue, such as cracks.
Never operate damaged or leaking equip-
ment.
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 completely drain the heat transfer
liquid before moving the unit.
Transport the unit with care.
Shaking or dropping may also cause dam-
age inside the unit.
Observe all safety labels!
Do not remove safety labels!
12 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Never bring a unit into operation with a
damaged mains power cable.
Service and repairs may be performed by
authorized expert personnel only.
Recirculating Cooler C 900 Safety precautions
overfilled because the liquid will run into the inside of
Danger of electric shock! Short circuit with fire hazard!
WARNING
If the overflow is sealed, the unit may be damaged if
the unit.
Fire hazard when using water/glycol mixture.
Do not seal the overflow at the rear of the unit.
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Transportation, setup, and connection Recirculating Cooler C 900
7. Transportation, setup, and connection
Heavy loads – danger of crushing
Carry the unit with 2 persons.
CAUTION
7.1. Conditions during transportation and during
installation
Lifting and Transport:
Lift the unit with two persons grasping the bottom of the unit at
the front and rear. For transport set the unit on a suitable caster dolly (accessory).
Wear safety shoes.
Caster dolly
Place the unit on an even surface made of non-flammable
material.
Cooling machine, pump motor and electronics produce heat
inside the housing that must be dissipated through ventilation
openings.
Never block the unit's ventilation openings.
Maintain at least 20 cm of unobstructed space in front of and
behind the unit.
Do not install the unit in the immediate vicinity of heat sources
and do not expose it to direct sunlight.
Ensure good air flow and ventilation of the place of installation.
The place of installation should be large enough to ensure that
the heat dissipated from the unit will not excessively warm the
space (max. permissible ambient temperature: +40 °C).
In addition, the standard EN 378 prescribes a certain room
space for each kg of refrigerant in the event of refrigerant leakage.
Refer to the type label for the refrigerant volume.
For 0.25 kg of refrigerant R134a, 1 m3 of space is required.
14 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Transportation, setup, and connection
7.2. Tubing connection
Damage from escaping heat transfer liquid!
Use suitable temperature-control tubing.
CAUTION
Secure all tubing connections with hose clamps
to prevent slipping.
Avoid kinks in the tubing.
Check the tubing for material fatigue (such as
cracks) at regular intervals, but at least once per
year.
Preventive maintenance: When subject to mod-
erate wear, the tubing shall be replaced at regular intervals.
Do not seal the overflow!
If the external system is located at a higher level
than the recirculating cooler, it may be necessary to prevent the heat transfer liquid from flowing back into the cooler when switched off.
The following questions will help you recognize potential
hazards and minimize risks:
Are all tubes and electrical cables securely connected and
installed?
Take note especially of sharp edges, hot surfaces during
operation, moving machine parts, etc.
What must be done if a hazardous substance is spilled on-
to or into the unit?
Obtain information about the substance before starting
work and define decontamination methods.
Tubing connections
M10x1 outer or
Supply line ( )
hose fitting ∅ 8/10 mm ID
M10x1 outer or
Return line ( )
hose fitting ∅ 8/10 mm ID
Tab. 6
Refer to Chapter 13 for accessories like tubing, hose fittings, etc.
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Transportation, setup, and connection Recirculating Cooler C 900
1. Wait approximately one hour after transporting the unit to the
place of installation. This will allow any oil that was displaced
during transport (e.g. due to vertical position) to flow back
down, thus ensuring that the compressor can develop its maximum capacity.
2. Remove screw plugs from the connections.
3. Connect the external system to the pump connectors at the
rear of the recirculating cooler using appropriate tubing and
hose clamps.
16 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Operating and functional elements
8. Operating and functional elements
AMP
AMP
AMP
AMP
AMP
AMP
AMP
AMP
AMP
AMP
1
2
2(1)
2(2)
2(3)
Power switch, splash-proof, with
integrated safety cutout.
I = On
O = Off
Display elements
LED temperature display
Control display – Cooling
Control display – Alarm
3
Membrane keypad, splash-proof
Editing keys
3(1)
Setpoint higher / lower
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 17
Operating and functional elements Recirculating Cooler C 900
Enter key
3(2)
Store setpoint / parameter
4
5
6
7
8
9
Fill level indicator
Filling port, upper
Power cable with plug
Pump connection – pressure
pump, M10x1 outer or
hose fitting ∅ 8/10 mm ID
Pump connection – return line,
M10x1 outer or
hose fitting ∅ 8/10 mm ID
Overflow for bath tank, OD 10 mm,
ID 8 mm
10
Drain port, M10x1 outer
18 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Initial start-up
9. Initial start-up
9.1. Heat transfer liquids
No liability for use of other heat transfer liquids!
Do not use alcohols.
CAUTION
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 results in calcification in the bath.
Water containing iron can cause corrosion –
even on stainless steel.
Water containing chlorine can cause pitting
corrosion.
Distilled and deionized water is unsuitable.
Their special properties cause corrosion in
the bath, even in stainless steel.
When water is used, there will be a danger
of freezing at temperatures below +5 °C.
Water-glycol mixture:
Always observe the manufacturer's hazard and
safety precautions.
The water portion may evaporate over time.
Regularly check the mixture ratio and add water
when necessary.
The recirculating cooler may be used with the following heat transfer liquids:
Heat transfer liquid Temperature range
KNF heat transfer liquid -30 °C ... 80 °C
Water/glycol mixture (50:50) -30 °C ... 50 °C
Soft / decalcified water +5 °C ... 80 °C
Tab. 7
Use of unsuitable heat transfer liquid will result in
damage
Before using a non-recommended heat transfer
NOTE
liquid, always consult with KNF. KNF will assume no liability for damages resulting from use
of an unsuitable heat transfer liquid.
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Initial start-up Recirculating Cooler C 900
unit into operation with a damaged
9.2. Power connection
Danger of electric shock
Do not use the unit in a potentially explosive
atmosphere. The unit may be connected only to
DANGER
Compare the provided mains voltage and the network frequency to
the specifications on the type label. Refer to Chapter 5, Page 8f for
permissible voltage deviations.
power outlets with a protective ground contact!
The mains plug serves as a safe disconnecting
device from the power supply and must be always easily accessible.
Never bring a
mains power cable.
Regularly check the mains power cable for
damage.
No liability for improper power connection!
20 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Initial start-up
will illuminate. The software version and unit model are
9.3. Filling
When filling, make sure that no heat transfer liquid penetrates the
interior of the recirculating cooler.
(For position see Ch. 8 Operating and functional elements, Pg. 17)
Connect the tubing to the external system and check for leaks.
Make sure the drain port (Pos. 10) is closed.
1. Remove cover from filling opening (Pos. 5).
2. Fill heat transfer liquid to the upper mark on the fill level indicator
(Pos. 4).
3. Switch on the recirculating cooler at the power switch (Pos. 1)
4. Start the unit. To do this, press the Enter key for about 4
seconds.
The unit will start pumping heat transfer liquid into the external
system.
5. Add more heat transfer liquid until the upper mark is reached.
The recirculating cooler is now ready for operation.
9.4. Switching the unit On and Off
Switching the unit On:
Use the power switch (1) to bring the unit into operation.
The unit then performs a self-test, during which the segments
of the four-digit LED temperature display and all control lamps
displayed.
The OFF notification then indicates that the unit is ready for operation.
Start:
Press the Enter key for approximately 4 seconds.
The LED will indicate the current bath temperature.
then
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 21
Switching the unit Off:
Press the Enter key for approximately 4 seconds.
Switch off the unit at the power switch.
Initial start-up Recirculating Cooler C 900
9.5. Adjusting temperature
Factory setting: 25 °C
The desired temperature can be selected either in the On or
Off state.
1. Briefly press one of the editing keys in order
to switch the display from the actual value to the setpoint value.
The value will be displayed for approximately 8 seconds. To
change the value, you must begin within this time.
2. Changing the value:
Press the editing key to increase the value.
Press the editing key to decrease the value.
Press the key briefly for individual steps; press and hold the
key to move quickly through the values.
3. Press Enter key to store the selected value.
9.6. Timer function
The max. selectable time
is preset at the factory:
33 h 19 min.
The timer function allows the user to preset the desired operating
time.
9.6.1. Setting the time
The unit must be in the OFF state to change this setting.
1. Retrieving the timer function:
Press and hold the Enter key and briefly press the edit-
ing key . The most recently selected time is displayed.
2. Setting the time:
Press the editing key to select a higher value.
Press the editing key to select a lower value.
Press the key briefly for individual steps; press and hold the
key to move quickly through the values.
3. Press the Enter key to store the selected value.
Example: 120 minutes
This time will remain in memory until changed.
22 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900
If this safety standard is not required, the NAMUR recommendation
with the aid of a tim
9.6.2. Timer operation
Timer operation
Start timer:
Press and hold the Enter key and briefly press the editing
key .
The bath temperature is shown. The comma in the display will
blink while the timer is running. The selected time is counted
down to zero. When the time has elapsed, the recirculating
cooler will stop.
Interrupting the timer / Power supply failure:
If there is a power failure, or if the unit is switched off at the power
switch, the recirculating cooler will store the time position in its
memory. When the power supply is switched on again, the recirculating cooler will operate for the remaining time.
Canceling timer operation:
Press and hold the Enter key for approximately 4 seconds.
The timer can be restarted.
9.7. Switching AUTOSTART on/off
KNF configures and delivers the recirculating cooler according to
the NAMUR recommendations. For starting, this means that the
unit must go into a safe operating state after a power failure. 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 pump motor is effected simultaneously.
The recirculating cooler's selected values remain in memory. The
operator can restore operation by pressing and holding the Enter
key (approx. 4 seconds) in manual operation.
can be circumvented with the AUTOSTART function. This enables
starting of the recirculating cooler with the power switch directly or
er switch.
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 23
Recirculating Cooler C 900
Press and hold the Enter key
and switch on the recirculat-
ing cooler with the power switch.
The LED display briefly displays the start mode.
= AUTOSTART on.
= AUTOSTART off.
Danger from unattended starting of unit!
When starting a recirculating cooler with
WARNING
"AUTOSTART", make sure that unattended
starting, e.g. following power failure, will not present a danger to persons or systems. Do not
seal the overflow at the rear of the unit.
24 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Protective features
off is fixed at 85 °C and is independent of
pressor and circulating pump are completely shut down and remain
at least
10. Protective features
10.1. High temperature cut-off
The high temperature cut-
the control circuit. When triggered, the compressor and circulating
+
pump are completely shut down and remain off. The alarm is
indicated by optical and audible signals (continuous tone) and the
"Error 14" message appears on the LED display.
Check the dimensions of the application.
You may have to use a more powerful recirculating cooler.
10.2. Low-liquid-level protection
This safety feature functions independently of the control circuit.
When the low-liquid-level protection device is triggered, the com-
+
off.
The alarm is indicated optically and acoustically with a continuous
audible signal. The "Error 01" message appears on the LED display.
Turn off the unit at the power switch, add heat transfer liquid,
and turn the unit on again!
Do not mix heat transfer liquids.
When refilling, always use the same type of heat
CAUTION
NOTE
transfer liquid that is already in the bath.
Inspect the low-liquid-level protection feature
twice per year.
To execute a functional test, drain the heat
transfer liquid until the low-liquid-level alarm is
triggered. Then refill liquid.
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 25
Troubleshooting guide / Alarm messages Recirculating Cooler C 900
is emitted. The LED temperature display indicates the cause for the
11. Troubleshooting guide / Alarm messages
When the following disturbances occur, the compressor and circu-
lation pump of the recirculating cooler are completely shut down
+
and remain off.
The alarm display " “ illuminates and a continuous signal tone
alarm in form of a code.
Press the Enter key
The recirculating cooler is operated with no or too little heat trans-
fer liquid or the minimum fill level is not met.
Add heat transfer liquid.
Tube breakage has occurred (insufficient filling level due to excessive heat transfer liquid pumped out).
Replace tubing and refill heat transfer liquid.
Cable of the working temperature sensor interrupted or short-
circuited.
Working or high-temperature sensor is defective.
Working-temperature and high-temperature sensors report a
temperature difference of more than 25 K.
to mute the signal tone.
Error in A/D converter.
The return temperature is higher than the high temperature cut-off
1. Switch off the recirculating cooler at the power switch.
device's cut-off value of 85 °C.
Check the dimensions of the application.
You may have to use a more powerful recirculating cooler.
The leads to the high-temperature sensor are broken or short-
circuited.
2. Wait approx. 2 seconds.
3. Switch on the recirculating cooler at the power switch.
If the error occurs again, a remote diagnosis must be performed.
26 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Troubleshooting guide / Alarm messages
Disturbances that are not displayed:
Overload protection:
a) for compressor motor
b) for pump motor
After a short cooling interval, the unit will automatically restart.
Main fuse:
The unit's power switch (1) also serves as a safety cutout.
After a short cooling interval, the unit can be restarted.
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Cleaning / repairing the unit Recirculating Cooler C 900
n-
The recirculating cooler is designed for continuous operation under
12. Cleaning / repairing the unit
Danger of electric shock
Always turn off the unit and disconnect the
mains cable from the power source before clea
Front venting grid
DANGER
Maintain cooling capacity!
To maintain the full cooling performance, clean the condenser at
the front of the unit from time to time.
1. Switch off the recirculating cooler at the power switch.
2. Pull the mains power plug.
3. Vacuum (through the front venting grid) any dirt that has collected on the condenser.
ing the unit.
Never allow humidity to enter the unit.
Service and repair tasks may be performed by
authorized and qualified personnel only.
Cleaning:
Clean the unit using a cloth and low surface tension water.
normal conditions. Periodic maintenance is not required.
The bath tank should be filled only with a suitable heat transfer
liquid. In the event of contamination, it is essential to replace the
heat transfer liquid from time to time.
If returning the unit to KNF:
Observe Chapters 14 and 15!
Package the unit carefully and properly.
The unit must be standing upright during shipment.
Label the packaging accordingly.
KNF is not responsible for damages that occur as a result
of improper packing.
KNF reserves the right, in the interest of product improvement,
to perform during the repair process any necessary technical
changes that contribute to flawless functionality.
28 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Cleaning / repairing the unit
specific regulations for
Place under the unit a suitable container for capturing the used
ew at the
12.1. Draining
Danger of electric shock
Turn off the unit and disconnect it from the
power source.
DANGER
Improper storage and disposal of the heat transfer
liquid will result in environmental damages.
Always store and dispose of used heat transfer
NOTE
liquid in an environmentally responsible way. Always comply with countrydisposal.
1. Turn off the unit and disconnect it from the power source.
2.
heat transfer liquid.
3. To drain the heat transfer liquid, unscrew the drain scr
rear of the unit.
4. Tilt the unit slightly to the rear to enable complete draining.
5. Close the drain screw after the complete emptying of the unit.
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 29
Accessories Recirculating Cooler C 900
13. Accessories
Accessories Order No.
Heat transfer liquid, 5 liters 301143
Heat transfer liquid, 10 liters 301439
Norprene® hose ID10
(sold by the meter*)
Hose fitting ID10 with cap GL14 301198
Caster dolly 301434
Tab. 8 * Indicate desired length in whole meters.
028187
30 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
Recirculating Cooler C 900 Returns
14. Returns
Pumps and systems used in laboratories and process-based
industries are exposed to a wide variety of conditions. This means
that the components contacting pumped media could become
contaminated by toxic, radioactive, or otherwise hazardous substances.
For this reason, customers who send any pumps or systems back
to KNF must submit a Health and safety clearance and decontamination form in order to avoid a hazardous situation for KNF employees. This Health and safety clearance and decontamination
form provides the following information, among other things:
physiological safety
whether medium-contacting parts have been cleaned
whether the equipment has been decontaminated
media that have been pumped or used
and must declare physiological safety. To ensure worker safety,
work may not be started on pumps or systems without a signed
Health and safety clearance and decontamination form.
For optimal processing of a return, a copy of this declaration
should be sent in advance via e-mail, regular mail, or fax to KNF
Customer Service (refer to final page for address). In order to avoid
endangering employees who open the shipment's packaging,
despite any residual hazards, the original version of the Health and
safety clearance and decontamination form must accompany the
delivery receipt on the outside of the packing.
The template for the Health and safety clearance and decontamination form is included with these Operating Instructions and may
also be downloaded from the KNF website.
The customer must specify the device type(s) and serial number(s)
in the Health and safety clearance and decontamination form in
order to provide for the unambiguous assignment of the Declaration to the device that is sent to KNF.
In addition to the customer's declaration of physiological safety,
information about operating conditions and the customer's application are also of importance to ensure that the return shipment is
handled appropriately. Therefore, the Health and safety clearance
and decontamination form requests this information as well.
Translation of original Operating Instructions, English, KNF 301425-301429 03/14 31
Health and safety clearance and decontamination form Recirculating Cooler C 900
15. Health and safety clearance and decontamination form
32 Translation of original Operating Instructions, English, KNF 301425-301429 03/14
KNF worldwide
Benelux
Netherlands
KNF Verder B.V.
Utrechtseweg 4a
NL-3451 GG Vleuten
Tel. 0031 (0)30 677 92 40
Fax 0031 (0)30 677 92 47
E-mail: info@knf-verder.nl
www.knf-verder.nl
Benelux
Belgium, Luxembourg
KNF Verder N.V.
Kontichsesteenweg 17
B-2630 Aartselaar
Tel. 0032 (0)3 8719624
Fax 0032 (0)3 8719628
E-mail: info@knf.be
www.knf.be
China
KNF Neuberger Trading
(Shanghai) Co., Ltd
No. 36 Lane 1000
Zhang Heng Road
Shanghai 201203, P.R. China
Tel. 0086 (0)21 685 965 66
Fax 0086 (0)21 339 006 26
E-mail: info@knf.com.cn
www.knf.com.cn
Germany
KNF Neuberger GmbH
Alter Weg 3
D-79112 Freiburg
Tel. 0049 (0)7664 5909-0
Fax 0049 (0)7664 5909-99
E-mail: info@knf.de
www.knf.de
France, Morocco,
Algeria
KNF Neuberger
4, Bld. d’Alsace Z.I.
F-68128 Village-Neuf
Tel. 0033 (0)389 70 35 00
Fax 0033 (0)389 69 92 52
E-mail: info@knf.fr
www.knf.fr
United Kingdom
KNF Neuberger U.K. Ltd.
Avenue 2
Station Lane
Industrial Estate
Witney Oxon OX28 4FA
Tel. 0044 (0)1993 77 83 73
Fax 0044 (0)1993 77 51 48
E-mail: info@knf.co.uk
www.knf.co.uk
India
KNF Pumps + Systems
(India) Pvt. Ltd.
RAJIV GANDHI INFOTECH
PARK
Phase 1
Ganga Estate, Survey No. 152/2/2
Above AXIS BANK
Hinjewadi
Pune 411 057
Tel. 0091 (0)20 640 13 923
0091 (0)20 640 08 923
Fax 0091 (0)20 229 33 923
E-mail: info@knfpumps.in
www.knfpumps.in
Italy
KNF ITALIA S.r.l.
Via Flumendosa, 10
I-20132 Milano
Tel. 0039 02 27 20 38 60
Fax 0039 02 27 20 38 48
E-mail: info@knf.it
www.knf.it
Japan
KNF Japan Co.Ltd.
Across Shinkawa Bldg. Annex 3F
1-16-14 Shinkawa, Chuo-ku,
Tokyo, Japan 104-0033
Tel. 0081 (0)3 3551-7931
Fax 0081 (0)3 3551-7932
E-mail: info@knf.co.jp
www.knf.co.jp
Korea
KNF Neuberger Ltd.
Woosan Bldg.RM#202,
336-4, Hwikyung-Dong
Dongdaemun-Ku.,
130-090, Seoul
Tel. 0082 (0)2 959-0255/6
Fax 0082 (0)2 959-0254
E-mail: knf@knfkorea.com
www.knfkorea.com
Sweden, Denmark, Finland,
Norway
KNF Neuberger AB
Mejerivägen 4,
P.O. Box 44060
SE-10073 Stockholm
Tel. 0046 (0) 87445113
Fax 0046 (0) 87445117
E-mail: info@knf.se
www.knf.se
Switzerland
Sales
KNF Neuberger AG
Stockenstrasse 6
CH-8362 Balterswil
Tel. 0041 (0)71 973 993 0
Fax 0041 (0)71 973 993 1
E-mail: knf@knf.ch
www.knf.ch
Taiwan
KNF Neuberger Ltd.
9-2 FL., No., 24, Lane 123,
Section 6,
Ming Chuan East Road
Taipei City, Taiwan
Tel. 00886-2-2794-1011
Fax 00886-2-8792-1648
E-mail: knftwn@knftwn.com.tw
www.knftwn.com.tw
United States, Canada, South
America
KNF Neuberger, Inc.
Two Black Forest Road
Trenton, NJ
08691-1810
Tel. 001 (609) 890-8600
Fax 001 (609) 890-8323
E-mail: knfusa@knf.com
www.knfusa.com
South America
Direct phone: 001 609-649-1010
E-mail: gb@knf.com
KNF product centers
Product center for gas
pumps:
Germany
KNF Neuberger GmbH
Alter Weg 3
D-79112 Freiburg
Tel. 0049(0)7664 5909-0
Fax 0049(0)7664 5909-99
E-mail: info@knf.de
www.knf.de
Product center for liquid
pumps:
Switzerland
KNF FLODOS AG
Wassermatte 2
CH-6210 Sursee
Tel. 0041(0)41 925 00 25
Fax 0041(0)41 925 00 35
E-mail: info@knf-flodos.ch
www.knf-flodos.ch
Product center for micro
pumps:
Switzerland
KNF Micro AG
Zelglimatte 1b
CH-6260 Reiden
Tel. 0041(0)62 787 88 88
Fax 0041(0)62 787 88 99
E-mail: info@knf-micro.ch
www.knf-micro.ch
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