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