KNF N143 User manual

N143, N186
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
KNF 310172-310175 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................................................................................ 5
4 Technical data .................................................................. 7
5 Design and function ........................................................ 11
6 Transport ........................................................................ 15
7 Installation and connection ............................................. 18
8 Operation ........................................................................ 25
9 Servicing ......................................................................... 28
10 Troubleshooting .............................................................. 33
11 Spare parts and accessories .......................................... 35
12 Returns ........................................................................... 36
13 Appendix......................................................................... 37
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax. [phone]
www.knf.com

Diaphragm Pump N143, N186 About this document
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 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, N186
4 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 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 diaphragm
breaks: Depending on the medium being transferred, breakage of the di-
aphragm can result in a dangerous mixture if the medium mixes with the
air in the compressor housing.
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).
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.

Diaphragm Pump N143, N186 Safety
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 5
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 diaphragm and/or leaks, the transferred medium
mixes with the air in the surroundings and/or in the pump housing. 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.
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.

Safety Diaphragm Pump N143, N186
6 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19
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.

Diaphragm Pump N143, N186 Technical data
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 7
4 Technical data
Technical data
Pump materials
N143AP/SP/STE
N186.1.2AP/SP/STE
N186.3AP/SP/STE
Assembly Material AP Material SP Material ST
Head plate, intermediate
plate
Aluminum Stainless steel Stainless steel
Diaphragm EPDM EPDM PTFE
Reed valves Stainless steel Stainless steel Stainless steel
O-ring EPDM EPDM FPM
Conrod plate Aluminum Aluminum Aluminum
Retainer plate Stainless steel Stainless steel Stainless steel
Connection (only N 186) Steel Stainless steel Stainless steel
Tab.2
Pneumatic values
Parameter Value
N143AP
N143SP
Value
N186.1.2AP
N186.1.2SP
Value
N186.3AP
N186.3SP
Max. permissible operating
pressure [bar rel*]
-Continuous operation
7.0 7.0 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)
Parameter Value
N143ST
Value
N186.1.2ST
Value
N186.3ST
Max. permissible operating
pressure [bar rel*]
-Continuous operation
7.0 7.0 0.5
Ultimate vacuum [mbar
abs.]
130 130 25
Flow rate at atm. pressure [l/
min]**
21 35 21
Tab.4 *Bar rel related to 1013 hPa
**Liters in standard state (1013 hPa, 20°C)

Technical data Diaphragm Pump N143, N186
8 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19
Pneumatic connections
Pump type Value
N143, N186.3 Thread size G 1/4*
N186.1.2 For hose Ø 10
Tab.5 *Acc. to ISO 228
Connection for water cooling
Pump type Value
N143 Thread size G 1/4*
N186.1.2 Thread size G 1/4*
N186.3 Thread size G 1/4*
Tab.6 *Acc. to ISO 228
Electrical data for pumps with capacitor motor
N143
Parameter Value Value Value Value
Voltage [V]* 100 115 220 230
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] 500 ** 480 480
Current consumption [A] 10 ** 3.4 4.6
Motor protection class See motor type plate
Max. permissible mains
voltage fluctuations
See operating instructions for motor
Tab.7 *For further voltage and frequency variants, see type plate
**See type plate
N186.1.2
Parameter Value Value Value Value
Voltage [V]* 100 115 220 230
Frequency [Hz]* 50/60 60 60 50
Power P1 [W] ** ** ** 550
Current consumption [A] ** ** ** 4.5
Motor protection class See motor type plate
Max. permissible mains
voltage fluctuations
See operating instructions for motor
Tab.8 *For further voltage and frequency variants, see type plate
**See type plate
N186.3
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 fluctuations
See operating instructions for motor
Tab.9 *For further voltage and frequency variants, see type plate
**See type plate

Diaphragm Pump N143, N186 Technical data
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 9
Electrical data for pumps with three-phase motor
N143
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] ** ** ** 500
Current consumption [A] ** ** ** 3.3/1.9
Motor protection class See motor type plate
Max. permissible mains
voltage fluctuations
See operating instructions for motor
Tab.10 *For further voltage and frequency variants, see type plate
**See type plate
N186.1.2
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 fluctuations
See operating instructions for motor
Tab.11 *For further voltage and frequency variants, see type plate
**See type plate
N186.3
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 fluctuations
See operating instructions for motor
Tab.12 *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]
SP/ST
Weight [kg]
AP
N143 approx. 23 approx. 20.5
N186.1.2 approx. 28.5 approx. 24
N186.3 approx. 28.5 approx. 24
Tab.13 Weight

Technical data Diaphragm Pump N143, N186
10 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19
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
N186.1.2
N186.3
See Chapter 7.1 Installing the pump
Fig. 10,
Fig. 11
and Fig. 12
Gas tightness** of the pump head
(Leak rate):
N143.9, N186.1.2.9,
N186.3.9
N143AP.13, N186.1._P.13,
N186.3_P.13
N143ST.13, N186.1.2ST.13,
N186.3ST.13
< 6 x 10-3 mbar l/s***
< 6 x 10-6 mbar l/s***
< 6 x 10-5 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
N186.1.2/.3
IP00
IP20
Tab.14 *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 7.4 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

Diaphragm Pump N143, N186 Design and function
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 11
5 Design and function
Design
1Pneumatic pump outlet
2Pneumatic pump inlet
3Electrical terminal box
4Motor
5Motor fan cover
6Connection for water
cooling
6
5
4
3
2
1
Fig.1 Design N143

Design and function Diaphragm Pump N143, N186
12 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19
1Union nut
2Connection for water
cooling
3Pneumatic head con-
nection
4Pneumatic pump inlet
5Motor
6Motor fan cover
7Electrical terminal box
8Pneumatic pump outlet
12
1 3 4 5 6
3
8
2
117
Fig.2 Design N186.1.2

Diaphragm Pump N143, N186 Design and function
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 13
1Pneumatic pump outlet
2Connection for water
cooling
3Union nut
4Pneumatic head con-
nection
5Motor
6Motor fan cover
7Electrical terminal box
8Pneumatic pump inlet
3
27
6
5
432
1
8
Fig.3 Design N186.3

Design and function Diaphragm Pump N143, N186
14 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19
Function of a diaphragm pump
1Outlet valve
2Inlet valve
3Transfer chamber
4Diaphragm
5Eccentric
6Connecting rod
7Pump drive
Fig.4 Function of a diaphragm pump
Diaphragm pumps transfer, compress (depending on the version) and evacu-
ate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric (5) and the
connecting rod (6). In the downwards stroke, it aspirates the gas to be trans-
ferred via the inlet valve (2). In the upwards stroke, the diaphragm presses the
medium out of the pump head via the outlet valve (1). The transfer chamber
(3) is hermetically separated from the pump drive (7) by the diaphragm.

Diaphragm Pump N143, N186 Transport
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 15
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, N186
16 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 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.15 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, N186 Transport
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 17
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, N186
18 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 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

Diaphragm Pump N143, N186 Installation and connection
Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19 19
Fig.8 Mounting dimensions pump series N186.1.2
Fig.9 Mounting dimensions pump series N186.3

Installation and connection Diaphragm Pump N143, N186
20 Translation of Original Operating and Installation Instructions, English, KNF 310172-310175 05/19
Cooling air supply
WARNING
Danger of getting burned by hot surfaces
Hot surfaces could occur if the pump overheats.
àWhen installing the pump, make sure that
sufficient cooling air infeed and discharge is
ensured.
Immediate environment of the
hot pump parts
àDuring installation, make sure that no combustible or thermally de-
formable objects are positioned in the immediate environment of the
hot pump parts (head, motor).
Installation location àMake 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.
àMake sure that the installation location is accessible for maintenance
and service.
àMake sure that the pump is securely attached to the intended fastening
holes. If necessary, secure pump to base plate with rubber-bonded
metal (see accessories, Chapter 11.2 Accessories; observe details on
pump weight, Chapter 4 Technical data).
àMake sure that access to moving parts (such as via the pump housing
from below) is avoided.
The IP protection class of the pump motor is specified on the type
plate.
àMount the pump at the highest point in the system to prevent conden-
sate from collecting in the pump head.
àProtect pump from dust.
àProtect pump from vibration and impact.
Installation position àThe pump can be mounted in any installation position. Use metal
screws to fasten the pump at the indicated attachment points.
WARNING
Personal injury and/or property damage from vi-
brations
Pump vibrations, in combination with adjacent
components, can result in crushing and/or dam-
age to these components.
àMake sure that pump vibrations cannot lead
to dangers in combination with adjacent com-
ponents.
Protection against foreign
objects
àTake protective measures against touching and foreign objects which
could enter the pump.