KNF N963 User manual

N936
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTION
ENGLISH
KNF 320276-320275 09/19 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

Index
1 About this document ......................................................... 3
2 Use ................................................................................... 4
3 Safety................................................................................ 5
4 Technical data .................................................................. 8
5 Design and function ........................................................ 10
6 Transport ........................................................................ 12
7 Installation and connection ............................................. 13
8 Operation ........................................................................ 18
9 Servicing ......................................................................... 21
10 Troubleshooting .............................................................. 25
11 Spare parts and accessories .......................................... 27
12 Returns ........................................................................... 28
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax. [phone]
www.knf.com

Diaphragm Pump N936 About this document
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 3
1 About this document
1.1 Using the operating and installation instructions
The operating and installation instructions are part of the pump.
àIn the event of uncertainties with regard to the content of the operating
and installation instructions, please contact the manufacturer (contact
data: see www.knf.com). Please have the type designation and serial
number of the pump ready.
àRead the operating and installation instructions before you commission
the pump.
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.
Follow other sequentially numbered steps.
This symbol indicates important information.

Use Diaphragm Pump N936
4 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
Operating parameters and
conditions
Requirements for the transferred
medium
2 Use
2.1 Proper use
The pumps are intended exclusively for transferring gases and vapors.
Responsibility of the owner
Only install and operate the pumps in accordance with the operating pa-
rameters and conditions described in Chapter 4 Technical data.
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.
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.
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
The pumps are not suitable for aggressive media. For aggressive media,
pumps from the KNF product line are available – please contact us.
Pumps that can produce both vacuum as well as overpressure may not be
used to simultaneously produce vacuum and overpressure.
No overpressure 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 N936 Safety
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 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.
When working on the pump, 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
Chapter 4 Technical data.
Make certain that the permissible ambient temperature (4 Technical data)
is not exceeded.
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.

Safety Diaphragm Pump N936
6 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
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/EU.
The following harmonized standards are satisfied:
§DIN EN 55014-1/2
§DIN EN 61326-1 – Class A
§DIN EN 60204-1
§DIN EN 50581
§DIN EN 61000-6-2/3
The pumps comply with:
§EN 61010-1
§IEC 61010-1
§UL 61010-1
§CAN/CSA-C22.2 No. 61010-1
including the following comments:
§The pumps are intended for use up to degree of contamination 2 or
comparable environment.
§The requirements on the housing with respect to fire protection, me-
chanical protection and electrical connection must be satisfied in the fi-
nal application.
§Maximum ambient temperature for continuous operation: +50°C.
Briefly >+50°C; Temperatures must be determined in the final applica-
tion.
§The warming (temperature measurements) must be tested in the final
application.
§The terminal strip is suitable exclusively for wiring at the factory.
§The pumps must be connected to protective earth.
§The motor has insulation class F (+155°C) and is equipped with a self-
resetting overtemperature switch.

Diaphragm Pump N936 Safety
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 7
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 N936
8 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
4 Technical data
Technical data
Pump materials
Assembly Material
Pump head Anodized Al
Diaphragm HNBR
Valves HNBR
O-rings FPM
Tab.2
Pneumatic values
Parameter Value
Max. permissible operating pressure
[bar rel*]
0.5
Ultimate vacuum [mbar abs.] 200
Flow rate at atm. pressure [l/min]**
(50 Hz)
34 ± 10%
Flow rate at atm. pressure [l/min]**
(60 Hz)
36 ± 10%
Tab.3
*Bar rel related to 1013 hPa
**Liters in standard state (1013 hPa, 20°C)
Pneumatic connections
Pump type Value
N936 EU Thread size G 1/4
N936 US Thread size NPT 1/4
Tab.4

Diaphragm Pump N936 Technical data
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 9
Electrical data
Parameter Value
Voltage [V] 100 – 120
and
200 - 240
Frequency [Hz] 50/60 Hz
Power [kW] 0.19
Max. permissible mains voltage fluc-
tuations
± 10%
Motor protection class IP00
Protection class I
Voltage 100 – 120 V
Max. current consumption [A] 2.1 @ 50 Hz
1.8 @ 60 Hz
Voltage 200 – 240 V
Max. current consumption [A] 1.2 @ 50 Hz
0.8 @ 60 Hz
Tab.5
Thermal switch The motors are equipped standard with a thermal switch for moni-
toring against overheating.
Weight
Pump type Value [kg]
N936 Approx. 4
Tab.6
Other parameters
Parameter Value
Permissible ambient temperature
(long-term) [°C]*
+15 to +50
Permissible media temperature
(long-term) [°C]
+5 to +70
Permissible media temperature
(max. 30s) [°C]
+5 to +100
Dimensions See Fig. 3, Chapter 7.1 Installing
the pump
Highest permissible relative air hu-
midity of the environment
80% for temperatures to 31°C, de-
creasing linearly to 50% at 50°C.
Maximum installation altitude [m
above sea level]
2000
Tab.7
*for ambient temperature >+50°C in intermittent or short-period operation, the max.
surface temperature on the capacitor is to be checked in the final device. This must
not exceed +85°C.

Design and function Diaphragm Pump N936
10 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
5 Design and function
Design
1Fan
2Pneumatic pump inlet
3Pneumatic pump outlet
4Electrical connection
1
2
3
4
Fig.1 Diaphragm pump N936

Diaphragm Pump N936 Design and function
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 11
Function of a diaphragm pump
1Outlet valve
2Inlet valve
3Transfer chamber
4Diaphragm
5Eccentric
6Connecting rod
7Pump drive
Fig.2 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.

Transport Diaphragm Pump N936
12 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
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).
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.
Parameter
Parameter Value
Storage temperature [°C] + 5 to + 40
Transport temperature [°C] - 10 to + 60
Permissible humidity (non-condens-
ing) [%]
30 to 85
Tab.8 Transport parameters
Prior to commissioning, make sure that the pump has reached the
ambient temperature (4 Technical data).

Diaphragm Pump N936 Installation and connection
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 13
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).
Take protective measures against penetration by foreign bodies into
the pump, as these can damage the pump.
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.3 Mounting dimensions pump series N936
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 and connection Diaphragm Pump N936
14 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
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 service.
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 coating with greases and oils.
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.
Fig.4 Pump N936
To dissipate any condensate that may form, KNF recommends in-
stalling the pump at an incline (sloping from the suction side to the
pressure side, see Fig. 4).
Also observe the markings on the pump head here).
WARNING
Risk of injury during operation
àTake protective measures against touching
the electrically live parts (electrical connection,
motor windings if applicable).
àTake protective measures against touching
moving and hot parts.
àAutomatic restart after tripping of the self-re-
setting protection temperature limiter.
CAUTION
Risk of pump damage during operation
àTake protective measures against the pene-
tration of foreign bodies into the pump.

Diaphragm Pump N936 Installation and connection
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 15
7.2 Electrical connection
DANGER
Danger to life from electric shock
àOnly have the pump connected by an autho-
rized specialist.
àOnly have the pump connected if the power
supply is disconnected.
àWhen connecting to a power source, observe the applicable standards,
directives, regulations and technical standards.
àInstall a device for separating the pump motor from the electrical mains
in the electrical installation (in accordance with EN 60335-1).
àProtect the pump motors in accordance with EN 60204-1 (overcurrent
protection, overload protection).
To comply with standards EN 61010-1, IEC 61010-1, UL 61010-1 and
CAN/CSA-C22.2 No. 61010-1, the power supply circuit must be equipped
with a fuse (slow-blow).
Voltage [V] Frequency [Hz] Fuse rating [A]
100-120 50/60 3.2 T
200-240 50/60 2.0 T
Tab.9
Refer to the type plate of the pump for the max. current consump-
tion.
àIt is recommended that an additional emergency-off system be in-
stalled.
àMount the pumps in such a way that it is not possible to touch the elec-
trically live parts (electrical connection).

Installation and connection Diaphragm Pump N936
16 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
Fastening the connection cables àFasten the connection cables so that
– the cables do not come into contact with movable or hot parts.
– the cables cannot be worn or damaged on sharp corners or edges
– no tensile and pressure forces are exerted on the connection point
of the cables (strain relief)
The three-phase motors are suitable for operation with frequency
converters.
Connecting the pump
1. Compare the data of the supply voltage with the details on the motor
type plate. See the pump type plate for the maximum current con-
sumption of the pump.
For the permissible deviation of the supply voltage, see operating
instructions for motor.
Set the direction of rotation according to the arrow on the fan hood
(see 7.1 Installing the pump and operating instructions for the mo-
tor).
2. Connecting the motor cable:
The electrical connection is established via three flat plugs
(each 6.3 x 0.8 for L1, N and PE).
7.3 Pneumatic connection
CAUTION
Personal injury or property damage through
ejected plugs
If not removed, the plugs on the pressure side of
the pump can be ejected during operation by the
resulting overpressure.
àRemove plugs during installation.
àWear appropriate personal protective equip-
ment.
Connected components àOnly connect components to the pump that are designed for the pneu-
matic data and thermal requirements of the pump. (see Chapter 4
Technical data).
Pump discharge àIf the pump is used as a vacuum pump, safely (with respect to medium
and noise) drain the hot pump discharge that may, under certain cir-
cumstances, occur at the pneumatic outlet of the pump.

Diaphragm Pump N936 Installation and connection
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 17
Connecting the pump
CAUTION
Risk of injury from mixing up suction and pressure
side
Mixing up the suction and pressure side can result
in breakage of connected components on the suc-
tion and pressure side.
àObserve the marking of inlet and outlet on
the pump head.
1. Remove protective plugs from the hose connection threads.
2. Connect suction and pressure line (for mounting dimensions, see
Chapter 4 Technical data).
The pressure line serves to dissipate any condensate that may
form. A container that collects the condensate must therefore be in-
stalled in the pressure line.
3. Lay the suction and pressure line at a downward angle to prevent con-
densate from running into the pump.

Operation Diaphragm Pump N936
18 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
8 Operation
8.1 General
WARNING
Risk of burns from hot pump parts and/or hot
medium
Some pump parts may be hot during or after oper-
ation of the pump.
àAllow pump to cool after operation.
àTake protective measures to protect against
touching hot parts.
WARNING
Injury to eyes
Coming too close to the inlet/outlet of the pump
may result in injury to the eyes due to the present
vacuum/operating pressure.
àDo not look into the pump inlet/outlet during
operation.
àOnly operate the pumps in accordance with the operating parameters
and conditions described in Chapter 4 Technical data.
àEnsure the proper use of the pumps (See Chapter 2.1 Proper use).
àEliminate the possibility of improper use of the pumps (see Chapter 2.2
Improper use).
àObserve safety notices (Chapter 3 Safety).
àThe pumps are built-in devices. Before they are commissioned, it must
be ensured that the machines or systems into which the pumps are in-
stalled comply with the relevant provisions.

Diaphragm Pump N936 Operation
Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19 19
WARNING
Risk of bursting of pump head due to excessive
pressure increase
àDo not exceed the maximum permissible op-
erating pressure (see 4 Technical data).
àMonitor the pressure during operation.
àIf the pressure exceeds the maximum permis-
sible operating pressure of the pump: immedi-
ately switch off the pump and remedy the fault
(see Chapter 10 Troubleshooting).
àOnly throttle or regulate the air or gas quantity
on the suction line to prevent the maximum
permissible operating pressure from being ex-
ceeded.
àIf the air or gas quantity on the pressure line is
throttled or regulated, make sure that the max-
imum permissible operating pressure at the
pump is not exceeded.
àEnsure that the pump outlet is not closed or
restricted.
Excessive pressure, with all of the associated hazards, can be pre-
vented by means of a bypass line with a pressure relief valve be-
tween the pressure and suction sides of the pump. Further informa-
tion is available from the KNF technical adviser (contact data: see
www.knf.com).
WARNING
Risk of dangerous gas mixtures during pump op-
eration if diaphragm breaks
If the diaphragm should break, the medium will
mix with the air in the compressor housing or in
the surroundings.
àStop pump immediately.
àThe diaphragm must be replaced prior to fur-
ther operation (see Chapter 9 Servicing).
WARNING
Personal injury and damage to the pump through
automatic start
If pump operation is interrupted by the thermal
switch due to overheating, the pumps start auto-
matically after they have cooled.
àEnsure that no dangerous situations can
arise as a result.
Operation with open suction-side gas connection can result in con-
taminants and objects being drawn in.
Pump standstill àWhen the pump is at a pump standstill, establish normal atmospheric
pressure in the lines.

Operation Diaphragm Pump N936
20 Translation of Original operating and installation instruction, English, KNF 320276-320275 09/19
Switching on the pump The pump must not be started up against pressure or vacuum dur-
ing switch-on. This also applies during operation after a brief power
failure. If a pump starts up against pressure or vacuum, the pump
may block, causing the thermal switch to respond and the pump to
switch off.
àEnsure that normal atmospheric pressure is present in the lines when
switching on.
Vapors as medium The service life of the diaphragm can be extended by preventing the for-
mation of condensate in the pump. Therefore:
àOnly perform work with saturated or nearly saturated vapors with a
warm pump.
àKNF recommends: When transferring aggressive media, flush the
pump before switching off (see Chapter 9.2.1 Flushing the pump) to ex-
tend the service life of the diaphragm.
Switching off/decommissioning
pump
àAt the end of an evacuation or a process, KNF recommends letting the
pump run for several minutes with air as the medium to remove con-
densate from the pump head (drying of the pump).
àEstablish normal atmospheric pressure in the lines (relieve pump
pneumatically).
Recommissioning àBefore recommissioning, observe the applicable standards, guidelines,
regulations and technical standards at the electrical connection.
Inspecting the pump àInspect the pump periodically for external damage or leakage.