KNF N922STE User manual

N922S_E IP54
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTION
ENGLISH
KNF 318667-318664 05/21 EN-US
OEM
Notice!
Before operating the pump and accessories, read and observe the operating and installation instructions as
well as the safety information!
DIAPHRAGM PUMP

Table of contents
1 About this document ......................................................... 3
2 Use ................................................................................... 6
3 Safety................................................................................ 7
4 Technical data .................................................................. 9
5 Design and function ........................................................ 11
6 Transport ........................................................................ 13
7 Installation and connection ............................................. 14
8 Operation ........................................................................ 22
9 Servicing ......................................................................... 25
10 Troubleshooting .............................................................. 31
11 Spare parts and accessories .......................................... 33
12 Returns ........................................................................... 34
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Tel. [phone]
Fax. [phone]
www.knf.com

Diaphragm pump N922S_E IP54 About this document
Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21 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 and serial number of
the pump ready.
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.
àRead the operating and installation instructions before you commission
the pump.
àGive the operating and installation instructions only completely and un-
changed 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 Exclusion of liability
The manufacturer assumes no liability for damages and malfunctions re-
sulting from failure to observe the operating and installation instructions.
The manufacturer assumes no liability for damages and malfunctions re-
sulting from changes or modifications to the device and improper handling.
The manufacturer assumes no liability for damages and malfunctions re-
sulting from impermissible spare parts and accessories.

About this document Diaphragm pump N922S_E IP54
4 Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21
1.3 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, serious injury or
serious damage is pos-
sible.
CAUTION warns of a possibly
dangerous situation
Minor injury or damage
is possible.
NOTICE Warns of possible dam-
age
Damage is possible.
Tab.1 Danger levels
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.

Diaphragm pump N922S_E IP54 About this document
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Explanations of pictograms
Pictogram Meaning
General warning symbol
Warning of hot surface
Warning of electrical voltage
Warning of poisonous substances
Warning of hand injuries through crushing
Observe the operating instructions
General mandatory sign
Environmentally conscious disposal
Tab.2 Explanations of pictograms

Use Diaphragm pump N922S_E IP54
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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.
Only pumps that are fully assembled and in the condition as delivered 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.
Check the tightness of the connections between the pipes of the applica-
tion and the pump (or the connection of the pump) at regular intervals.
Leaky connections carry the risk of releasing dangerous gases and vapors
from the pump system.
Requirements on 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 or the surroundings.
Only transfer gases that remain stable under the pressures and tempera-
tures that arise in the pump.
2.2 Improper use
The pumps are not allowed to be operated in explosive atmospheres.
The pumps are not suitable for transferring:
§Dusts
§Liquids
§Aerosols
§Biological and microbiological substances
§Fuel
§Explosives and flammable materials
§Fibers
§Oxidants
§Food
Pumps that can produce both vacuum as well as overpressure may not be
used to simultaneously produce vacuum and overpressure.
This function can be made possible on a project basis following consulta-
tion with KNF Customer Service.
No overpressure may be applied to the suction side of the pump.
This function can be made possible on a project basis following consulta-
tion with KNF Customer Service.
Pumps with capacitor motor are not intended for operation with a fre-
quency converter.

Diaphragm pump N922S_E IP54 Safety
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3 Safety
Observe the safety notices in Chapters 7 Installation and connec-
tion and 8.1 Operation.
The pumps are produced in accordance with the generally recognized
rules of engineering, as well as the occupational health, safety and acci-
dent prevention regulations. 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 power, observe the corre-
sponding safety rules.
Personnel Make sure that only specially trained and instructed personnel work on the
pumps. This applies, in particular, to assembly, connection and service
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.
Avoid contact with the heads and housing parts, as the pump heats up
during operation and may remain hot for some time after operating.
When working on the pump, make certain that the pump is disconnected
from mains and without power.
Ensure that no hazards arise from gas flowing when gas connections are
open, from the effects of noise or from hot, corrosive, dangerous and envi-
ronmentally hazardous gases.
Make sure that an EMC-compliant installation of the pump is ensured at all
times to prevent the occurrence of dangerous situations.
Handling of 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 pumping hazardous media, observe the safety regulations for the
handling of said media.
Handling of combustible media Note that the pumps are not designed to be explosion-proof.
Make certain that the temperature of the medium is always sufficiently be-
low the ignition temperature of the medium so as to prevent ignition or ex-
plosion. This also applies for abnormal operating situations.
Note that the temperature of the medium increases when the pump com-
presses the medium.
Therefore, make certain 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.
Where applicable, also take into account external energy sources (such as
radiation sources) that could additionally heat the medium.
In case of doubt, contact KNF Customer Service.

Safety Diaphragm pump N922S_E IP54
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Environmental protection Store and dispose of all replacement parts in accordance with the environ-
mental regulations. Observe the respective national and international regu-
lations. 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
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:
§EN IEC 63000
§EN 60034-30-1 (only pumps with three-phase motor)
§EN 60034-1
Customer service and repairs The pumps are maintenance-free. However, KNF recommends periodic in-
spection of the pump for obvious changes in noise or vibration.
Only have repairs to the pumps performed by qualified KNF personnel.
Housings with electrically live components may only be opened by special-
ist personnel.
Use only genuine spare parts from KNF when performing servicing work.

Diaphragm pump N922S_E IP54 Technical data
Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21 9
4 Technical data
4.1 Technical data
Pump materials
Assembly Material
N922STE
Material
N922SPE
Pump head Stainless steel Stainless steel
Diaphragm PTFE-coated EPDM
Reed valve Stainless steel Stainless steel
Valve limiter Stainless steel Stainless steel
O-ring FPM EPDM
Tab.3
Pneumatic values
Parameter Value
N922STE
Value
N922SPE
Max. permissible oper-
ating pressure [bar rel]
-Continuous operation
-Intermittent operation
4.0
6.0
4.0
6.0
Ultimate vacuum [mbar
abs.]
≤ 110 ≤ 110
Flow rate at atm. pres-
sure [l/min]*:
50 Hz 60 Hz 50 Hz 60 Hz
21 ± 10% 24 ± 10% 22 ± 10% 25 ± 10%
Flow rate at max. per-
missible operating pres-
sure [l/min]*
-4.0 bar rel
-6.0 bar rel
9.5 ± 10%
5 ± 10%
12 ± 10%
7 ± 10%
11.5 ± 10%
7± 10%
13.5 ± 10%
8.5 ± 10%
Tab.4 *Liters in standard state (1013 mbar)
Electrical parameters
Parameter Value Value Value Value Value
Voltage [V]* 100 115 220 230 230/400
Frequency [Hz]* 50/60 60 60 50 50/60
Power P1 [W] ** ** ** ** **
Current consumption
[A]
** ** ** ** **
Motor protection
class
See motor type plate
Voltage tolerance See operating instructions for the motor
Tab.5 Electrical parameters N922S_E IP54
*For further voltage and frequency variants, see pump nameplate
**See pump nameplate

Technical data Diaphragm pump N922S_E IP54
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Pneumatic connections
Pump type Value
N922S_E EU: Thread size G1/4*
US: Thread size NPT1/4*
Tab.6 *Acc. to ISO 228
Other parameters
Parameter Value
Permissible ambient temperature
[°C]
+ 5 to + 60
Permissible media temperature [°C] + 5 to + 60
Gas tightness* of the pump head < 6 x 10-3 mbar l/s
Relative air humidity 80% for temperatures to 31°C, de-
creasing linearly to 50% at 40°C
(non-condensing).
Maximum installation altitude [m
above sea level]
2000
Dimensions
N922S_E (three-phase AC motor)
N922S_E (capacitor motor)
See Fig. 3, Kapitel 7.1 Installing the
pump
See Fig. 4, Chapter 7.1 Installing
the pump
Tab.7 *The gas tightness of the pump head is no longer ensured after the pump
head is opened or after replacing diaphragm and valve plates/seals. A leak test
can be used to determine whether the original gas tightness has been re-achieved.
Weight
Parameter Value
N922STE
Value
N922SPE
Weight [kg] 8.3 8.3

Diaphragm pump N922S_E IP54 Design and function
Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21 11
5 Design and function
Design
1Pump inlet
2Pump outlet
3Pump head
4Motor
5Capacitor (only capaci-
tor motor)
6Electrical terminal box
Fig.1 Diaphragm pump N922S_E

Design and function Diaphragm pump N922S_E IP54
12 Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21
Function of a diaphragm pump
1Outlet valve
2Inlet valve
3Transfer chamber
4Diaphragm
5Eccentric
6Connecting rod
21
4
3
6
5
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 pumping chamber
(3) is separated from the pump drive by the diaphragm.

Diaphragm pump N922S_E IP54 Transport
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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
NOTICE
Prior to commissioning, make sure that the pump
has reached the ambient temperature (4 Techni-
cal data).

Installation and connection Diaphragm pump N922S_E IP54
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7 Installation and connection
Install the pumps only in accordance with the operating parameters and
conditions described in Chapter 4 Technical data.
àObserve the safety instructions (see Chapter 3 Safety).
DANGER
Risk of dangerous gas mixtures during pump op-
eration
Depending on the medium being transferred,
breakage of the media-contacting components
can result in a dangerous mixture if the medium
mixes with the air in the compressor housing or
the surroundings.
àBefore using a medium, check the compati-
bility of the media-contacting components
(see 4 Technical data) with the medium.
7.1 Installing the pump
àStore the pump at the same ambient temperature as the installation to
mitigate condensation.
Mounting dimensions àFor mounting dimensions, see the following figures:
Fig.3 Mounting dimensions N922S_E (three-phase AC motor)

Diaphragm pump N922S_E IP54 Installation and connection
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Fig.4 Mounting dimensions N922S_E (capacitor motor)
Cooling air supply
WARNING
Danger of burning on 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 area of the hot pump
parts (head, drive).
Installation location àMake sure that the installation location is dry and that the pump is pro-
tected from rain, splash water, gushing water, dripping water and other
contamination.
àMake sure the pump location in the instrument allows access for peri-
odic maintenance and inspection.
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 the pump from dust.
àProtect the pump from vibration and impact.

Installation and connection Diaphragm pump N922S_E IP54
16 Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21
7.2 Aligning the compressor housing
Tool Quantity Tool/material
1 Allen key, 2 mm
1 Allen key, 4 mm
Tab.9
If damp gases are transferred with the pump, condensate may form
in the pump head during operation. This results in, among other
things, a reduction of the performance.
To ensure optimum suction capacity, it is possible to orient the
pump head downwards so that the condensate that forms can sim-
ply drain out of the pump head. For this purpose, the compressor
housing including pump head (depending on installation position)
can be rotated in increments of 90° and mounted.
1Housing cover
2Allen screws
3Eccentric
4Motor fastening screws
Fig.5 Removing the housing cover
1. Loosen the four Allen screws (2) of the housing cover (1) and remove
them.
WARNING
Risk of explosion from damage.
If the housing cover is bent or if the paint is dam-
aged, there is no risk of explosion.
àPerform the work steps carefully and without
the use of force.
2. Remove the housing cover (2).
The eccentric crank drive (3) and the four motor fastening screws (4)
become visible.
3. Loosen and remove the four motor fastening screws (4).

Diaphragm pump N922S_E IP54 Installation and connection
Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21 17
4. Turn the housing to the desired position.
The compressor housing can be rotated completely around its own
axis relative to the motor in 90° increments.
Fig.6 Installation positions of the compressor housing
5. Screw the four motor fastening screws (4) back in and tighten them (tight-
ening torque: 6 Nm).
6. Position the housing cover (1) and screw down with the four Allen screws
(2) (tightening torque: 15 Ncm).

Installation and connection Diaphragm pump N922S_E IP54
18 Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21
7.3 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 regula-
tions, directives, and technical standards.
àInstall a device for separating the pump motor from the electrical mains
in the electrical installation (e.g., in accordance with EN 60335-1).
àProtect the pump motors, e.g., in accordance with EN 60204-1 (over-
current protection, overload protection).
Refer to the type plate for the maximum current consumption of the
pump.
àIt is recommended that an additional EMERGENCY STOP device be
installed.
àMount the pumps in such a way that it is not possible to touch electri-
cally live parts (electrical connection).
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)
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).
The three-phase motors are suitable for operation with frequency
converters (see operating instructions for the motor).
Connecting the pump
1. Confirm that the supply voltage meets the parameters listed on the
pump nameplate. Refer to the pump nameplate for the rated current
consumption.
2. Electrically connect the pump.
3. Open the terminal box cover.
4. Connect the ground conductor to the pump motor.
Set the direction of rotation according to the arrow on the fan cowl
(see 7.1 Installing the pump and the motor operating instructions).
5. Connect the electrical power cables in accordance with Fig. 7 and
Fig. 8 (three-phase motor) or Fig. 9 (capacitor motor) (cf. motor oper-
ating instructions).

Diaphragm pump N922S_E IP54 Installation and connection
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Fig.7 Star connection (three-phase motor; high voltage)
Fig.8 Δ-connection (three-phase motor; low voltage)

Installation and connection Diaphragm pump N922S_E IP54
20 Translation of Original Operating and Installation Instruction, english, KNF 318667-318664 05/21
Fig.9 Electrical connection (capacitor motor)
6. Close the terminal box cover again.