KNF C 900 User manual

KNF 301425-301429 03/14
Translation of original Operating Instructions, nglish Keep for future reference!
Operating Instructions
Read and observe these Operating Instructions!
Recirculating Cooler
C 900
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Tel. [phone] / 5909-0
Fax [phone] / 5909-99
-mail: [email protected]
www.knf.de
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
Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14 3
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
is essential for safe
and reliable operation of the recirculating cooler. Failure to
observe the Operating Instructions may result in damage or
injury.

Intended use Recirculating Cooler C 900
4 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
2. Intended use
The KNF Recirculating Cooler is designed to control the tempera-
ture of certain liquid media.
xternal 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 L D temperature
display.
PID1
The PID temperature regulation is used to withdraw heat from the
heat transfer liquid by means of the cooling apparatus and to
automatically regulate the required need.
NOTE
Health hazards associated with the heat transfer
liquid
 KNF recirculating coolers are not intended for
direct temperature control of food and luxury ar-
ticles, pharmaceutical products, or medical de-
vices.
Direct temperature control means:
Unprotected contact of the object with the bath medium (heat
transfer liquid).

Recirculating Cooler C 900 Operator responsibility – Safety precautions
Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14 5
. Operator responsibility – Safety precau-
tions
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 speci-
fies the most important safety precautions to preclude these dan-
gers 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 in-
formation 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)!

Handling Recirculating Cooler C 900
6 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
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 rec-
ommend 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
DANGER
Ignition of potentially explosive mixtures
 The unit is not for use in a potentially explosive
atmosphere.
Special materials specifications (heat transfer liquids) must be
observed in order to comply with the intended use. Neither corro-
sive nor corrosive-acting heat transfer liquids may be used. Ob-
serve 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:

Recirculating Cooler C 900 Handling
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1
Warning of a danger area.
Attention!
Please observe the documentation. (Operating
Instructions, safety data sheet)
2a
or
Carefully read the user information prior to
switching on the unit.
Area of applicability: U
2b Carefully read the user information prior to
switching on the unit.
Area of applicability: United States, NAFTA
Tab. 1
4. . 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 uropean Union – W
directive.
Directive of the uropean Parliament and of the Council on Waste
lectrical and lectronic quipment (W ).
This directive requires electrical and electronic equipment marked
with a crossed
-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!

Technical data Recirculating Cooler C 900
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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 L D DISPLAY
Temperature indication: L D DISPLAY
Adjustment and display
resolution
0.1 °C
Temperature control PID 1
Working temperature sensor Pt 100
High temperature cut-off 85 °C - fixed value
Low-liquid-level protection Float switch
Circulating pump
Flow rate [l/min]
max. at 0 bar 15
Pressure [bar]
max. at 0 liter 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-
ture range [°C]
5 ... 40
Permissible return tempera-
ture [°C]
max. 80
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
60
10
;
90
5
;
180
0
;
210
5
;
220
10
;
240
15
;
250
20
−
−
+
+
+
+
Electrical data
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 frequenc
Ambient temperature 20 °C

Recirculating Cooler C 900 Technical data
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5.2. Warning and safety precautions
Warning and safet precautions
High temperature cut-
off, fixed value
85 °C
Low-liquid-level protec-
tion
Float switch
Alarms optical + audible (permanent)
Overload protection for cooling machine and pump motor
Classification according
to DIN 12876-1
Class I
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 tem-
perature of +40 °C
 Voltage fluctuations of ±10% are permissible.
The recirculating cooler meets the safety stipulations of Directive
2004/108/ C for electromagnetic compatibility, Directive
2006/42/ C for machines, and Directive 2011/65/ U (RoHS2). The
following harmonized standards are fulfilled:
 N 61010-1
 N 61010-2-010
 N 61326-1
 N 378-1/2/3/4
The recirculating cooler complies with the following according to
I C 664:
 Protection class I
 Overvoltage category II
 Contamination level 2
DANGER
Ignition of potentially explosive mixtures
 The unit is not for use in potentially explosive
atmospheres.
MC 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).
Standards

Technical data Recirculating Cooler C 900
10 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
5. . Materials used on liquid-contacting parts
Description Material
PVC tube
(liquid level indicator)
PVC
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
1.4571
Float switch 1.4301, PP
Hose fitting CuZn39Pb3 (nickel plated)
Tab. 4

Recirculating Cooler C 900 Safety precautions
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6. Safety precautions
6.1. Explanation of safety precautions
Warning
WARNING
This symbol indicates a potential danger.
It also indicates the possible consequences of failure
to observe the warning. The signal word (e.g. "Warn-
ing") indicates the level of danger.

Here you will see actions for avoiding the danger
and potential consequences.
Danger levels
Signal word Meaning Consequences if not observed
DANGER warns of immedi-
ate danger
Consequences are death or
serious injury and/or serious
property damage
WARNING warns of potential
danger
Death or serious injury and/or
serious damage to property are
possible
CAUTION warns of a poten-
tially dangerous
situation
Minor injury or damage to prop-
erty are possible
NOTE warns of a poten-
tially harmful
situation
Damage to the system or some-
thing in your surroundings
Tab. 5
6.2. Explanation of other notes
 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. . Safety instructions
To avoid personal injury and property damage, it is important to
follow the safety instructions. These instructions supplement work-
place safety regulations.
Connect the unit only to a mains power socket with
ground contact (P – protective earth)!
These tasks may be performed only by expert per-
sonnel.

Safety precautions Recirculating Cooler C 900
12 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
 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 switch-
ing the unit on.
 Use suitable temperature-control tubing.

Make sure that the tubing is secured against
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 pro-
cedures, 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!
 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
Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14 13
WARNING
Danger of electric shock! Short circuit with fire haz-
ard!
If the overflow is sealed, the unit may be damaged if
overfilled because the liquid will run into the inside of
the unit.
Fire hazard when using water/glycol mixture.
 Do not seal the overflow at the rear of the unit.

Transportation, setup, and connection Recirculating Cooler C 900
14 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
7. Transportation, setup, and connection
CAUTION
Heavy loads – danger of crushing
 Carry the unit with 2 persons.
 Wear safety shoes.
7.1. Conditions during transportation and during
installation
Caster dolly
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 cast-
er dolly (accessory).
 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.
 nsure 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 N 378 prescribes a certain room
space for each kg of refrigerant in the event of refrigerant leak-
age.
Refer to the type label for the refrigerant volume.
 For 0.25 kg of refrigerant R134a, 1 m3 of space is required.

Recirculating Cooler C 900 Transportation, setup, and connection
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7.2. Tubing connection
CAUTION
Damage from escaping heat transfer liquid!
 Use suitable temperature-control tubing.
 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 regu-
lar intervals.
 Do not seal the overflow!
 If the external system is located at a higher level
than the recirculating cooler, it may be neces-
sary to prevent the heat transfer liquid from flow-
ing 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
Supply line ( )
M10x1 outer or
hose fitting ∅ 8/10 mm ID
Return line ( )
M10x1 outer or
hose fitting ∅ 8/10 mm ID
Tab. 6
Refer to Chapter 13 for accessories like tubing, hose fittings, etc.

Transportation, setup, and connection Recirculating Cooler C 900
16 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
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 max-
imum 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.

Recirculating Cooler C 900 Operating and functional elements
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8. Operating and functional elements
15
AMP
15
AMP
15
AMP
15
AMP
15
AMP
15
AMP
15
AMP
15
AMP
15
AMP
15
AMP
1
Power switch, splash-proof, with
integrated safety cutout.
I = On
O = Off
2
Display elements
2(1)
L D temperature display
2(2)
Control display – Cooling
2(3)
Control display – Alarm
Membrane keypad, splash-proof
3(1)
diting keys
Setpoint higher / lower

Operating and functional elements Recirculating Cooler C 900
18 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
3(2)
nter key
Store setpoint / parameter
4 Fill level indicator
5 Filling port, upper
6 Power cable with plug
7
Pump connection – pressure
pump, M10x1 outer or
hose fitting ∅ 8/10 mm ID
8
Pump connection – return line,
M10x1 outer or
hose fitting ∅ 8/10 mm ID
9
Overflow for bath tank, OD 10 mm,
ID 8 mm
10
Drain port, M10x1 outer

Recirculating Cooler C 900 Initial start-up
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9. Initial start-up
9.1. Heat transfer liquids
CAUTION
No liability for use of other heat transfer liquids!
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 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 trans-
fer 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
NOTE
Use of unsuitable heat transfer liquid will result in
damage
 Before using a non-recommended heat transfer
liquid, always consult with KNF. KNF will as-
sume no liability for damages resulting from use
of an unsuitable heat transfer liquid.

Initial start-up Recirculating Cooler C 900
20 Translation of original Operating Instructions, nglish, KNF 301425-301429 03/14
9.2. Power connection
DANGER
Danger of electric shock
 Do not use the unit in a potentially explosive
atmosphere. The unit may be connected only to
power outlets with a protective ground contact!
 The mains plug serves as a safe disconnecting
device from the power supply and must be al-
ways easily accessible.
 Never bring a
unit into operation with a damaged
mains power cable.
 Regularly check the mains power cable for
damage.
 No liability for improper power connection!
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.