KNF N143.12 User manual

N143.12, N186.12
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
KNF 310176-310179 05/19 EN-US
OEM
Note!
Before operating the pump and the accessories, please read the operating and installation instructions and
pay attention to the safety precautions!
DIAPHRAGM PUMP

Contents
1 About this document ......................................................... 3
2 Use ................................................................................... 4
3 Safety................................................................................ 6
4 Technical data .................................................................. 8
5 Design and function ........................................................ 13
6 Transport ........................................................................ 17
7 Installation and connection ............................................. 20
8 Operation ........................................................................ 28
9 Servicing ......................................................................... 31
10 Troubleshooting .............................................................. 38
11 Spare parts and accessories .......................................... 40
12 Returns ........................................................................... 41
13 Appendix......................................................................... 42
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax. [phone]
www.knf.com

Diaphragm Pump N143.12, N186.12 About this document
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 3
1 About this document
1.1 Using the operating and installation instructions
The operating and installation instructions are part of the pump.
àThe individual chapters of these operating and installation instructions
make reference to the operating instructions of the motor manufacturer
for capacitor and three-phase motors. They are appended to these op-
erating and installation instructions.
àGive the operating and installation instructions to the next owner.
àKeep the operating and installation instructions within reach at all
times.
Project pumps For customer-specific project pumps (pump models that begin with "PJ" or
"PM"), there may be deviations from the operating and installation instruc-
tions.
àFor project pumps, also observe the agreed specifications.
1.2 Symbols and markings
Warning notice
WARNING
A notice that warns you of danger is located here.
Possible consequences of a failure to observe the
warning notice are specified here. The signal
word, e.g., warning, indicates the danger level.
àMeasures for avoiding the danger and its
consequences are specified here.
Danger levels
Signal word Meaning Consequences if not
observed
DANGER warns of immediate
danger
Death or serious injury
or serious damage will
result.
WARNING warns of possible dan-
ger
Death or serious injury
or serious damage are
possible.
CAUTION warns of a possibly
dangerous situation
Minor injuries or dam-
age are possible.
Tab.1
Other notices and symbols
àAn activity to be carried out is specified here (a step).
1. The first step of an activity to be carried out is specified here.
This symbol indicates important information.

Use Diaphragm Pump N143.12, N186.12
4 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
2 Use
2.1 Proper use
The pumps are intended exclusively for transferring gases and vapors.
Responsibility of the owner
Operating parameters and
conditions
Only install and operate the pumps in accordance with the operating pa-
rameters and conditions described in Chapter 4 Technical data.
Protect compressors with a pressure relief device between the pressure
side of the compressor and the first shut-off valve.
Only fully assembled pumps may be operated.
Make sure that the installation location is dry and that the pump is pro-
tected against rain, splash, gushing and drip water as well as from other
contaminants.
The tightness of the connections between the pipes of the application and
the pump (or the connection of the pump) is to be checked at regular inter-
vals. Leaky connections carry the risk of releasing dangerous gases and
vapors from the pump system.
Requirements for the transferred
medium
Before transferring a medium, check whether the medium can be trans-
ferred danger-free in the specific application.
Before using a medium, check the compatibility of the media-contacting
components (see 4 Technical data) with the medium.
Risk of dangerous gas mixtures during pump operation if the working di-
aphragm breaks: Depending on the medium being transferred, breakage
of the working diaphragm can result in a dangerous mixture if the medium
mixes with the air in the innerspace between the working diaphragm and
the safety diaphragm:
§KNF recommends monitoring the innerspace between the working di-
aphragm and the safety diaphragm (see item 5 in Fig. 4) through the
hole(s) in the intermediate ring for a change in pressure. If the pres-
sure changes in the innerspace, the pump is to be stopped immedi-
ately.
§After breakage of the working diaphragm, the pump must be stopped
immediately. Replace the working diaphragm and safety diaphragm
prior to further operation (see Chapter 9 Servicing).
§If pressure or output changes without apparent reason, the pump is to
be switched off immediately and checked for damage.
Only transfer gases that remain stable under the pressures and tempera-
tures that arise in the pump.
Frequency converter Pumps with three-phase motor are designed for operation with frequency
converter in the speed range 500 – 1500 rpm (50 Hz) or 600 – 1600 rpm
(60 Hz) (see also Chapter 7.2 Electrical connection).

Diaphragm Pump N143.12, N186.12 Use
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 5
2.2 Improper use
The pumps may not be operated in explosive atmospheres.
The pumps are not suitable for transferring:
§Dusts
§Liquids
§Aerosols
§Biological and microbiological substances
§Fuel
§Explosives and flammable material
§Fibers
§Oxidants
§Food
Pumps that can produce both vacuum as well as overpressure may not be
used to simultaneously produce vacuum and operating pressure.
No operating pressure may be applied to the suction side of the pump.
Pumps with capacitor motor are not intended for operation with a fre-
quency converter.

Safety Diaphragm Pump N143.12, N186.12
6 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
3 Safety
Observe the safety notices in chapters 7 Installation and connection
and 8.1 Operation.
The pumps are built in accordance with the generally recognized rules of
technology and the occupational safety and accident prevention regula-
tions. Nevertheless, dangers can arise during their use that lead to injuries
to the user or third parties or to damage to the pump or other property.
Only use the pumps in perfect technical condition, for their intended use,
safely and aware of the dangers and in observation of the operating and
installation instructions.
The components that are to be connected to the pumps must be designed
according to the pneumatic data of the pumps.
When connecting the pumps to the electrical mains, observe the corre-
sponding safety rules.
Personnel Make sure that only trained and instructed personnel or specially trained
personnel work on the pumps. This applies, in particular, to assembly, con-
nection and servicing work.
Make sure that the personnel have read and understood the operating and
installation instructions, particularly the chapter on safety.
Working in a safety conscious
manner
Observe the regulations on accident prevention and safety during all work
on the pumps and during operation.
The pump heads heat up during operation; therefore avoid contact with
them.
Make certain that the pump is disconnected from mains and without
power.
Make sure that no dangers arise from flow when gas connections are
open, from noises or from hot, corrosive, dangerous and environmentally
hazardous gases.
Make sure that an EMC-compliant installation of the pump is ensured at all
times and that no dangerous situation can thereby arise.
Working with hazardous media Upon breakage of the working diaphragm and/or leaks, the transferred
medium mixes with the air in the innerspace between the working di-
aphragm and the safety diaphragm and/or with the air in the surroundings.
Make sure that a dangerous situation cannot arise as a result.
When transferring hazardous media, observe the safety regulations for the
handling of these media.
Working with combustible media Note that the pumps are not designed to be explosion-proof.
Make sure that the temperature of the medium is always sufficiently below
the ignition temperature of the medium so as to prevent ignition or explo-
sion. This also applies for abnormal operating situations.
Note here that the temperature of the medium increases when the pump
compresses the medium.
Therefore, make sure that the temperature of the medium also remains
sufficiently below the ignition temperature of the medium even when it is
compressed to the maximum permissible operating pressure of the pump.
The maximum permissible operating pressure of the pump is stated in the
technical specifications (4 Technical data).
If applicable, also take into consideration external energy sources (e.g., ra-
diation sources) that could add heat to the medium.
In case of doubt, contact KNF Customer Service.

Diaphragm Pump N143.12, N186.12 Safety
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 7
Environmental protection Store and dispose of all replacement parts in accordance with environmen-
tal regulations. Observe the respective national and international regula-
tions. This applies in particular to parts that are contaminated with toxic
substances.
EU/EC directives/standards With respect to the Machinery Directive 2006/42/EC, the pumps are partly
completed machinery and are, therefore, to be regarded as not ready for
use. Partly completed machinery may not be commissioned until it has
been determined that the machine into which the partly completed machin-
ery is to be installed complies with the provisions of the Machinery Direc-
tive 2006/42/EC. The following fundamental requirements of Annex I of Di-
rective 2006/42/EC (general principles) are applied and observed:
§General principles no. 1
§No. 1.1.2. / 1.1.3. / 1.3.1. / 1.3.3. / 1.3.4. / 1.4.1. / 1.5.1. / 1.5.2. /
1.5.8. / 1.5.9. / 1.7.4. / 1.7.4.1. / 1.7.4.3.
As these partly completed machines are built-in devices, the mains con-
nections and equipment for disconnecting and switching off the partly com-
pleted machinery as well as overcurrent and overload protection gear must
be considered when mounting.
Furthermore, protection against contact with moving and hot parts, if
present, must be provided during installation.
The pumps comply with Directive 2011/65/EC.
The following harmonized standards are satisfied:
§DIN EN 60034-1/5/6/9
§DIN EN 60204-1
§DIN EN 61000-6-1/2/3/4
§DIN EN 50581
§EN 60034-30-1 (only pumps with three-phase motor)
Customer service and repairs The pumps are maintenance-free. KNF does, however, recommend peri-
odically inspecting the pumps for noticeable changes to noises and vibra-
tions.
Only have repairs to the pumps performed by the responsible KNF Cus-
tomer Service.
Housings with live components may only be opened by specialist person-
nel.
Use only original parts from KNF during servicing work.

Technical data Diaphragm Pump N143.12, N186.12
8 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
4 Technical data
Technical data
Pump materials
N143SP.12E
N186.1.2SP.12E
N186.3SP.12E
Assembly Material SP
Head plate, intermediate plate, inter-
mediate ring
Stainless steel
Working diaphragm EPDM
Safety diaphragm EPDM
Reed valves Stainless steel
Retainer plate Stainless steel
O-ring EPDM
Conrod plates (top/bottom) Aluminum
Connection (only N186) Stainless steel
Tab.2
Pneumatic values
Parameter Value
N143SP.12E
Value
N186.1.2SP.1
2E
Value
N186.3SP.12
E
Max. permissible operating
pressure [bar rel*]
-Continuous operation
3.0 3.0 0.5
Ultimate vacuum [mbar
abs.]
120 120 15
Flow rate at atm. pressure
[l/min]**
23 42 23
Tab.3 *Bar rel related to 1013 hPa
**Liters in standard state (1013 hPa, 20°C)
Pneumatic connections
Pump type Value
N143.12
N186.3.12
Thread size G 1/4*
N186.1.2.12 For hose Ø 10
Hole for pressure monitoring of the
innerspace between working di-
aphragm and safety diaphragm (see
Chapter 7.4 Installing monitoring de-
vice and monitoring diaphragm in-
nerspace)
Thread size G 1/8*
Tab.4 *Acc. to ISO 228

Diaphragm Pump N143.12, N186.12 Technical data
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 9
Connection for water cooling
Pump type Value
N143.12 Thread size G 1/4*
N186.1.2.12 Thread size G 1/4*
N186.3.12 Thread size G 1/4*
Tab.5 *Acc. to ISO 228
Electrical data for pumps with capacitor motor
N143.12
Parameter Value Value Value Value
Voltage [V]* 100 115 220 230
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** 450 ** 450
Current consumption
[A]
** 5.6 ** 4.4
Motor protection class See motor type plate
Max. permissible
mains voltage fluctua-
tions
See operating instructions for motor
Tab.6 *For further voltage and frequency variants, see type plate
**See type plate
N186.1.2.12
Parameter Value Value Value Value
Voltage [V]* 100 115 220 230
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** ** ** 610
Current consumption
[A]
** ** ** 5.3
Motor protection class See motor type plate
Max. permissible
mains voltage fluctua-
tions
See operating instructions for motor
Tab.7 *For further voltage and frequency variants, see type plate
**See type plate
N186.3.12
Parameter Value Value Value Value
Voltage [V]* 100 115 220 230
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** ** ** 470
Current consumption
[A]
** ** ** 5
Motor protection class See motor type plate
Max. permissible
mains voltage fluctua-
tions
See operating instructions for motor
Tab.8 *For further voltage and frequency variants, see type plate
**See type plate

Technical data Diaphragm Pump N143.12, N186.12
10 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
Electrical data for pumps with three-phase motor
N143.12
Parameter Value Value Value Value
Voltage [V]* 200/346 277/480 220/380 230/400
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** ** ** 350
Current consumption
[A]
** ** ** 3.2/1.85
Motor protection class See motor type plate
Max. permissible
mains voltage fluctua-
tions
See operating instructions for motor
Tab.9 *For further voltage and frequency variants, see type plate
**See type plate
N186.1.2.12
Parameter Value Value Value Value
Voltage [V]* 200/346 277/480 220/380 230/400
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** ** ** 310
Current consumption
[A]
** ** ** 3.3/1.9
Motor protection class See motor type plate
Max. permissible
mains voltage fluctua-
tions
See operating instructions for motor
Tab.10 *For further voltage and frequency variants, see type plate
**See type plate

Diaphragm Pump N143.12, N186.12 Technical data
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 11
N186.3.12
Parameter Value Value Value Value
Voltage [V]* 200/346 277/480 220/380 230/400
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** ** ** 310
Current consumption
[A]
** ** ** 3.3/1.9
Motor protection class See motor type plate
Max. permissible
mains voltage fluctua-
tions
See operating instructions for motor
Tab.11 *For further voltage and frequency variants, see type plate
**See type plate
Thermal switch/PTC thermistor
sensor The motors are equipped as standard with a thermal switch (capaci-
tor motor) or with PTC thermistor sensor (three-phase motor) to
monitor against overheating (see operating instructions for the mo-
tor).
Weight
Pump type Weight [kg]
N143.12 approx. 24
N186.1.2.12 approx. 29.5
N186.3.12 approx. 29.5
Tab.12
Other parameters
Parameter Value
Permissible ambient temperature
[°C]
+ 5 to + 40
Permissible media temperature [°C] + 5 to + 40
Max. surface temperature* [°C] + 85
Dimensions
N143.12
N186.1.2.12
N186.3.12
See Chapter 7.1 Installing the pump
Fig. 11,
Fig. 12
and Fig. 13
Gas tightness** of the pump head
(leak rate)
< 6 x 10-6 mbar l/s***
Highest permissible relative air hu-
midity of the environment
80% for temperatures to 31°C, de-
creasing linearly to 50% at 40°C
Maximum installation altitude [m
above sea level]
See operating instructions for motor
Protection class of pump:
N143.12
N186.1.2/.3.12
IP00
IP20
Tab.13 *To reduce the surface temperature of the pump heads and to extend the
service life of the diaphragm, you can optionally attach a water cooling system (see
Chapter 7.5 Connecting water cooling (optional)).
**The gas tightness of the pump head is no longer ensured after the pump head is
opened or after changing diaphragm and reed valves. A leak test can be used to
determine whether the original gas tightness is again achieved.
***Values apply for helium leak test

Technical data Diaphragm Pump N143.12, N186.12
12 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
Additional equipment
The pump is equipped with a safety diaphragm.
àFor explanation on the task and principle, see Chapter 5 Design and
function.
àFor information on installation and connection, see Chapter 7 Installa-
tion and connection.
àFor information operation, see Chapter 8 Operation.

Diaphragm Pump N143.12, N186.12 Design and function
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 13
5 Design and function
Design
1Pneumatic pump outlet
2Pneumatic pump inlet
3Electrical terminal box
4Motor
5Motor fan cover
6Screw plug of the hole
for pressure monitoring
of the diaphragm in-
nerspace (2x)
7Connection for water
cooling
21
7
6
3 4
5
Fig.1 Design N143.12

Design and function Diaphragm Pump N143.12, N186.12
14 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
1Union nut
2Connection for water
cooling
3Pneumatic head con-
nection
4Pneumatic pump inlet
5Motor
6Motor fan cover
7Electrical terminal box
8Screw plug of the hole
for pressure monitoring
of the diaphragm in-
nerspace (2x per head)
9Pneumatic pump outlet
12
13 4 56
17
2
8
1
9
3
Fig.2 Design N186.1.2.12

Diaphragm Pump N143.12, N186.12 Design and function
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 15
1Pneumatic pump outlet
2Connection for water
cooling
3Union nut
4Pneumatic head con-
nection
5Motor
6Motor fan cover
7Electrical terminal box
8Screw plug of the hole
for pressure monitoring
of the diaphragm in-
nerspace (2x per head)
9Pneumatic pump inlet
6
54
3
2
1
9
8237
Fig.3 Design N186.3.12

Design and function Diaphragm Pump N143.12, N186.12
16 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
Function of double diaphragm pump
1Outlet valve
2Inlet valve
3Transfer chamber
4Working diaphragm
5Innerspace
6Hole for pressure moni-
toring of the innerspace
(5)
7Safety diaphragm
8Eccentric
9Connecting rod
10 Pump drive
1
3
5
8
10
2
4
6
7
9
Fig.4 Function principle of double diaphragm pump
Double diaphragm pumps transfer, compress (depending on the version) and
evacuate gases and vapors.
The elastic working diaphragm (4) is moved up and down by the eccentric (8)
and the connecting rod (9). In the downwards stroke, it aspirates the gas to be
transferred via the inlet valve (2). In the upwards stroke, the working di-
aphragm presses the medium out of the pump head via the outlet valve (1).
The transfer chamber (3) is hermetically separated from the pump drive (10)
by the working diaphragm.
Located below the working diaphragm is a second diaphragm (safety di-
aphragm (7)), which is under less mechanical stress during pump operation.
Should the working diaphragm be damaged, no gas can escape from the
pump.
The closed innerspace (5) between the two diaphragms can be monitored for
pressure change with the help of the hole(s) (6) provided for this purpose.
Damage to the working diaphragm can thereby be detected immediately.

Diaphragm Pump N143.12, N186.12 Transport
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 17
6 Transport
General
CAUTION
Personal injury and/or property damage due to in-
correct or improper transport of the pump
In the event of incorrect or improper transport, the
pump can fall down, be damaged or injure per-
sons.
àUse suitable auxiliary means if necessary
(carrying strap, lifting gear, etc.).
àWhere appropriate, wear suitable personal
protective equipment (e.g., safety shoes,
safety gloves).
CAUTION
Risk of injury from sharp edges on the packaging
There is a risk of injury from cutting on the sharp
edges when grabbing corners or when opening
the packaging.
àWhere appropriate, wear suitable personal
protective equipment (e.g., safety shoes,
safety gloves).
Only for two-headed pumps:
CAUTION
Personal injury and/or property damage due to in-
correct or improper transport of the pump
If the pump is raised and/or carried on the connec-
tion during transport, leaks and/or damages to the
pump may result.
àDo not carry the pump on the pneumatic con-
nection.
àTransport the pump in the original packaging to the installation loca-
tion.
àStore the original packaging of the pump (e.g., for later storage).
àInspect the pump for transport damage after receiving it.
àDocument any transport damage in writing.
àRemove any transport safeguards on the pump prior to commissioning.

Transport Diaphragm Pump N143.12, N186.12
18 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
Parameter
Parameter Value
Storage temperature [°C] + 5 to + 40
Transport temperature [°C] - 10 to + 60
Permissible humidity (non-condens-
ing) [%]
30 to 85
Tab.14 Transport parameters
Prior to commissioning, make sure that the pump has reached the
ambient temperature (4 Technical data).
Transport with carrying strap
Fig.5 Position of carrying strap (example)
1. Pull the carrying strap under the pump (see Fig. 5).

Diaphragm Pump N143.12, N186.12 Transport
Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19 19
Fig.6
2. Fasten the carrying strap between compressor housing and motor
(Fig. 1, see Fig. 6).
3. Make certain that the lifting load cannot be transferred from the belt to
the pump connection.
4. Lift the pump from the packaging with the help of lifting gear.
5. Lower the pump carefully at the installation location.

Installation and connection Diaphragm Pump N143.12, N186.12
20 Translation of Original Operating and Installation Instructions, English, KNF 310176-310179 05/19
7 Installation and connection
The pumps are only to be installed in accordance with the operating pa-
rameters and conditions described in Chapter 4 Technical data.
àObserve safety notices (see Chapter 3 Safety).
7.1 Installing the pump
àBefore installing, store the pump at the installation location to allow it to
reach the ambient temperature.
Mounting dimensions àFor mounting dimensions, see the following figures:
Fig.7 Mounting dimensions pump series N143.12