KNF N 89 User manual

KNF 121242-121509 04/20
OEM
N89 /N811 /N814 /N815
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
MINI DIAPHRAGM
VACUUM PUMP AND
COMPRESSORS
Note!
Before operating the pump and the accessories, please read the operating instructions on the web site
(www.knf.com/downloads) and pay attention to the safety precautions!

Contents Page
1. About this document..................................................................3
2. Use ............................................................................................4
3. Safety ........................................................................................6
4. Technical Data ..........................................................................9
5. Design and function.................................................................12
6. Installation and connection......................................................13
7. Operation.................................................................................21
8. Servicing..................................................................................23
9. Troubleshooting.......................................................................29
10. Spare parts and accessories...................................................31
11. Returns ....................................................................................33
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax [phone]
E-mail: [e-mail]
www.knf.de

Diaphragm vacuum pump N 89/N 811/N 814/N 815
Original-Operating and Installation Instructions, english, KNF 121242-121509 04/20 3
1. About this document
1.1. Using the Operating and Installation
Instructions
The Operating and Installation Instructions are part of the pump.
Pass on the Operating and Installation Instructions to the next
owner.
Customer-specific project pumps (pump models which begin with
“PJ” or “PM”) may differ from the Operating and Installation Instruc-
tions.
For project pumps, also observe the agreed upon specifica-
tions.
1.2. Symbols and markings
Warning
WARNING
A danger is located here.
Possible consequences of a failure to observe the
warning are specified
here. The signal word, e.g.
Warning, indicates the danger level.

Measures for avoiding the danger and its conse-
quences are specified here.
Danger levels
Signal word
Meaning
Consequences if not observed
DANGER
warns of immedi-
ate danger
Death or serious injuries and/or
serious damage are the conse-
quence.
WARNING
warns of possible
danger
Death or serious injuries and/or
serious damage are possible.
CAUTION
warns of a possi-
bly dangerous
situation
Minor injuries or damage are
possible.
Tab. 1
Other information and symbols
An activity to be carried out (a step) is specified here.
1. The first step of an activity to be carried out is specified here.
Additional, consecutively numbered steps follow.
This symbol refers to important information.
Project pump

Use Diaphragm vacuum pump N 89/N 811/N 814/N 815
4 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases and
vapors.
Owner’s responsibility
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4. Technical Data.
Only complete pumps may be taken into service.
Make sure that the installation location is dry and the pump is pro-
tected against rain, splash, hose and drip water as well as other
pollutions.
Before using a medium, check whether the medium can be trans-
ferred danger-free in the specific application case.
Before using a medium, check the compatibility of the materials of
the pump head, diaphragm and valves with the medium.
Only transfer gases which remain stable under the pressures and
temperatures occurring in the pump.
Operating parameter and
conditions
Requirements for
transferred medium

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Use
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 5
2.2. Improper use
The pumps may not be operated in an explosive atmosphere.
The pumps are not suitable for transferring dusts.
The pumps are not suitable for transferring liquids.
The pumps are not suitable for transferring Aerosol.
The pumps are not suitable for transferring biological and microbio-
logical substances.
The pumps are not suitable for transferring fuel.
The pumps are not suitable for transferring explosive and combus-
tible materials.
The pumps are not suitable for transferring fibers.
The pumps are not suitable for transferring oxidizing agent.
The pumps are not suitable for transferring foodstuffs.
The pumps are not suitable for use with aggressive media. Other
pumps in the KNF product line are designed for use with aggres-
sive media. Please contact us for more information.
The pumps must not be used to create vacuum and overpressure
simultaneously.
An overpressure must not be applied to the suction side of the
pump.

Safety Diaphragm vacuum pump N 89/N 811/N 814/N 815
6 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
3. Safety
Note the safety precautions in Chapter 6. Installation and con-
nection
and 7. Operation.
The pumps are built according to the generally recognized rules of
the technology and in accordance with the occupational safety and
accident prevention regulations. Nevertheless, dangers can result
during their use which lead to injuries to the user or others, or to
damage to the pump or other property.
Only use the pumps when they are in a good technical and proper
working order, in accordance with their intended use, observing the
safety advice within the Operating and Installation Instructions, at
all times.
Components connected to the pump must be designed to with-
stand the pneumatic performance of the pump.
Take care that safety regulations are observed when connecting
the pump to the electricity supply.
Make sure that only trained and instructed personnel or specially
trained personnel work on the pumps. This especially applies to
assembly, connection and servicing work.
Make sure that the personnel has read and understood the Operat-
ing and Installation Instructions, and in particular the “Safety” chap-
ter.
Observe the accident prevention and safety regulations when per-
forming any work on the pump and during operation.
Ensure that the pump s separated from the mains and is de-
energized.
The pump heads heat up during operation – avoid contact with
them.
Make sure that there are no hazards due to flow with open gas
connections, noises or hot gases.
Ensure that an EMC-compatible installation of the pump is ensured
at all times and that this cannot lead to a hazardous situation.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
If the diaphragm ruptures, the transferred medium will mix with the
air in the environment.
Take all necessary care to prevent this leading to a dangerous
situation.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium (compressor operation).
Personnel
Working in a safety
conscious manner
Handling dangerous media
Handling combustible media

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Safety
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 7
Hence, make sure the temperature of the medium is 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 (Chapter 4).
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
For pumps with a thermal switch: When the operation of the pump
is interrupted by the thermal switch, the pump will re-start automat-
ically after cooling down. Take all care necessary to prevent this
leading to a dangerous situation.
Project-specific pumps that are not fitted with a thermal switch
must be protected by the user against the risk of overheating.
In case of doubt, consult the KNF customer service.
Store all replacement parts in a protected manner and dispose of
them properly in accordance with the applicable environmental
protection regulations. Observe the respective national and inter-
national regulations. This especially applies to parts contaminated
with toxic substances.
For the purposes of the Machinery Directive 2006/42/EC, pumps
are “partly completed machinery”, and are therefore to be regarded
as not ready for use. Partly completed machinery may not be
commissioned until such time as it has been determined that the
machine in which the partly completed machinery is to be assem-
bled is in conformity with the provisions of the Machinery Directive
2006/42/EC. The following essential requirements of Annex I of
Directive 2006/42/EC (general principles) are applied and ob-
served:
−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.
(*only for pumps with AC motor)
As these partly completed machinery are OEM-models the power
supplies and the equipment for disconnecting and switching-off the
partly completed machinery respectively have to be considered
when mounting as well as over-current and overload protective
gear.
In addition a protection against mechanical parts in motion and hot
parts, if existing, has to be provided when mounting.
The pumps conform to the Directive 2011/65/EU.
The following harmonized standards have been used:
Environmental protection
EU/EC Directives / Standards

Safety Diaphragm vacuum pump N 89/N 811/N 814/N 815
8 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
N 89 K_E
N 811 K_E
N 814 K_E
N 815 K_E
N 89 K_DC
N 811 K_DC
N 814 K_DC
N 815 K_DC
DIN EN 55014-1/2
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 60034-1
DIN EN 60335-1
DIN EN 61000-6-1/2
DIN EN 50581
DIN EN 50581
Tab. 2
The pump is maintenance-free. But KNF recommends, checking
the pump regularly with regard to conspicuous changes in noise
and vibrations.
Only have repairs to the pumps carried out by the KNF Customer
Service responsible.
Housing with voltage-caring parts may be opened by technical
personnel only.
Use only genuine parts from KNF for servicing work.
Customer service and
repairs

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 9
4. Technical Data
Pump materials
N 89 KN_
N 811 KN_
Assembly
Material
Pump head
PPS
Wave diaphragm
EPDM
Valve
CR
Tab. 3
N 89 KT_ N 814 KT_
N 811 KT_ N 815 KT_
Assembly
Material
Pump head
PPS
Wave diaphragm
PTFE-coated
Valve
FFPM
Tab. 4
N 814 KN_
Assembly
Material
Pump head
PPS
Wave diaphragm
EPDM
Valve
FPM
Tab. 5
N 815 KN_
Assembly
Material
Pump head
PPS
Wave diaphragm
CR
Valve
EPDM
Tab. 6

Technical Data Diaphragm vacuum pump N 89/N 811/N 814/N 815
10 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
Pneumatic values
Pumpentyp
Max. permissible
operating pres-
sure [bar g]
Ultimate vac-
uum [mbar
abs.]
Delivery rate
[l/min]*
N 89 KNE
0,5
100
9,5
N 89 KNDC
0,5
100
9
N 89 KTE
0,5
170
9,5
N 89 KTDC
0,5
170
9
N 811 KNE
0,5
100
11,5
N 811 KNDC
0,5
100
11
N 811 KTE
0,5
170
11,5
N 811 KTDC
0,5
170
11
N 814 KNE
2,0
240
11,5
N 814 KNDC
2,0
240
12
N 814 KTE
2,0
290
11,5
N 814 KTDC
2,0
290
12
N 815 KNE
-
100
15
N 815 KNDC
-
100
16
N 815 KTE
-
160
14
N 815 KTDC
-
160
15
Tab. 7 *Liters in standard state (1013 mbar)
Pneumatic Connections
Pump type
Value
All pumps
G 1/8
Tab. 8
Electrical data
Parameter
Value
Electrical data
See type plate
Protection class Motor
IP 00
Protection class Pump
IP 00
Tab. 9
For pumps with a thermal switch:
The pumps are fitted as
standard with a thermal-switch to pro-
tect against over
loading.
Project-specific pumps that are not fitted with a thermal switch
must be protected by the user against the risk of overheating.
Thermal switch

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 11
Weight
Pump type
Value
N 89 K_E; N 811 K_E
Approx. 1.3 kg
N 89 K_DC; N 811 K_DC
Approx. 0.9 kg
N 814 K_E
Approx. 2.1 kg
N 815 K_E
Approx. 1.5 kg
N 814 K_DC; N 815 K_DC
Approx. 1.0 kg
Tab. 10
Other parameters
Parameter
Value
Permissible ambient tempera-
ture
+ 5°C to + 40°C
Permissible media temperature
+ 5°C to + 40°C
Dimensions
N 89/811 K_E
N 89/811 K_DC
N 814 K_E
N 814 K_DC
N 815 K_E
N 815 K_DC
See Fig. 3, Chap. 6.1
See Fig. 4, Chap. 6.1
See Fig. 5, Chap. 6.1
See Fig. 6, Chap. 6.1
See Fig. 7, Chap. 6.1
See Fig. 8, Chap. 6.1
Maximum permissible ambient
relative humidity
80% for temperatures up to
31°C, decreasing linearly to
50% at 40°C.
Max. altitude of site:
[m above sea level]
2000
Tab. 11

Design and function Diaphragm vacuum pump N 89/N 811/N 814/N 815
12 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
5. Design and function
Fig. 1: Diaphragm vacuum pump N 89 K_DC
Function Diaphragm Pump
Fig. 2: Pump head
Diaphragm pumps transfer, compress (depending on pump ver-
sion) and evacuate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric
(5) and the connection rod (6). In the downward stroke it aspirates
the gas to be transferred via the inlet valve (2). In the upward
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.
1 Pneumatic outlet
2 Pneumatic inlet
3 Motor
1 Outlet valve
2 Inlet valve
3 Transfer chamber
4 Diaphragm
5 Eccentric
6 Connection rod
7 Pump drive

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 13
6. Installation and connection
Only install and operate the pumps under the pneumatic operating
parameters and conditions described in Chapter 4, Technical Data.
Observe the safety precautions (see Chapter 3).
6.1. Installation of the pump
Before installation, store the pump at the installation location to
bring it up to ambient temperature.
Install the pump so that accidental finger contact with the fan is
impossible.
See Fig. 3 and Fig. 4 (pump series N 89/ N 811), Fig. 5 and Fig. 6
(pump series N 814) and Fig. 7 and Fig. 8 (pump series N 815) for
mounting dimensions.
Fig. 3: Mounting dimensions pump series N 89/811 K_E (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Mounting dimensions

Installation and connection Diaphragm vacuum pump N 89/N 811/N 814/N 815
14 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
Fig. 4: Mounting dimensions pump series N 89/811 K_DC (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Fig. 5: Mounting dimensions pump series N 814 K_E (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 15
Fig. 6: Mounting dimensions pump series N 814 K_DC (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Fig. 7: Mounting dimensions pump series N 815 K_E (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)

Installation and connection Diaphragm vacuum pump N 89/N 811/N 814/N 815
16 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
Fig. 8: Mounting dimensions pump series N 815 K_DC (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
WARNING
Danger of burns from hot surfaces
Hot surfaces may be
caused by overheating of the
pump.

Install the pump so that the motor fan can intake
sufficient cooling air.
When installing, make sure that there are no combustible or
thermally malleable objects placed in the immediate ambient of
the hot pump parts (head, motor).
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water as well as
other pollutions.
Make sure, that the installation location is accessible for
maintenance and service.
Install the pump at the highest point in the system to prevent
condensate from collecting in the pump head.
Protect the pump from dust.
Protect the pump from vibrations and jolts.
For pumps with fan: Install the pump so that accidental finger
contact with the fan is impossible.
Cooling air supply
Immediate ambient of the hot
pump parts
Installation location

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 17
WARNING
Personal injury and/or damage to property because
of vibration
In conjunction with adjacent components, vibration of
the pump may result in crushing and/or damage to
these components.

Make sure that vibrations of the pump do not
result in hazards associated with adjacent com-
ponents.
Protect the pump against contact and intrusion of foreign mat-
ter.
Foreign matter protection

Installation and connection Diaphragm vacuum pump N 89/N 811/N 814/N 815
18 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
6.2. Electrical connection
DANGER
Extreme danger from electrical shock

Only have the pump connected by an authorized
specialist.

Only have the pump connected when the power
supply is disconnected.
When connecting the device to a power source, the relevant
standards, directives, regulations, and technical standards
must be observed.
In the electrical installation, arrangements (complying with
EN 60335-1) must be made for disconnecting the pump motor
from the electrical supply.
The motors of the pump must be protected according to
EN 60204-1 (protection against excess current, or overload-
ing).
For max. operating current of the pump see pump’s type plate.
It is recommended that an additional “Emergency Stop” switch
is installed.
The pump must be installed so that contact with live parts is
impossible.
Fasten the connection cables so that:
the cables do not contact moving or hot parts.
the cables will not chafe or be damaged on sharp edges or
corners.
no pulling or pushing forces are exerted on the cable’s
connection points (strain relief).
For pumps with a thermal switch:
The pumps are fitted as standard with a thermal switch
(1~
motor)
to protect against overloading.
Project-specific pumps that are not fitted with a thermal switch
must be protected by the user against the risk of overheating.
Connecting pump
1. Compare the supply data with the data on the motor plate. For
maximum operating current of the pump see pump’s type
plate.
The voltage must not vary by more than + 10% and – 10%
from that shown on the type plate.
2. Open terminal box cover.
3. Connect the earth (ground) wire to the motor.
With dc motors the wires must be connected to the correct
polarity.
Attach connection cables

Diaphragm vacuum pump N 89/N 811/N 814/N 815 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20 19
4. Connect the mains cables according to the operating instruc-
tion of the motor.
5. Close the terminal cover box.
Only pumps with dc motors:
The Tests:
- Magnetic field with energy-technical frequency
- Electromagnetic HF field, amplitude-modulated
- Electromagnetic HF-field, pulse-modulated
- Discharging of static electricity
- High frequency, asymmetric
- Fast transients
were not carried out, cause the products do not contain electronic
modules, which can be affected by these tests.
The Surge-test can only be passed with additional means, or is not
mandatory, if: Form EN 61000-6-1 technical norm for EMC protec-
tion, part 1,10 test demands for EMC protection, table 3, EMC pro-
tection, D.C.-power in- and outputs. Remark 3: (quotation) Not to
be used with input connections which are foreseen for a connec-
tion with a battery or a rechargeable battery which has to be re-
moved or disconnected from the device for the recharge.
Devices with a D.C. power input which are foreseen to be operated
with an A.C. /D.C. converter have to be tested at an A.C. power
input of an A.C. /D.C. converter fixed by the manufacturer. In case
the converter was not fixed they have to be tested at an A.C. pow-
er input of typical (usual) A.C. /D.C. converter.
The test is applicable for D.C. power inputs which are foreseen for
a permanent connection to cables which are longer than 10m.
EMC-compatible Installation

Installation and connection Diaphragm vacuum pump N 89/N 811/N 814/N 815
20 Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
6.3. Pneumatic connection
CAUTION
Personal injury or damages to property by ejected
plugs
If the plug at the pressure side of the pump hasn’t
been removed, it
could be ejected because of the
overpressure during operation.

Remove the plug during the installation.
Only connect components to the pump which are designed for
the pneumatic data of the pump (see Chapter 4, Technical Da-
ta).
If the pump s used as a vacuum pump, safely discharge the
pump exhaust at the pump’s pneumatic outlet.
KNF recommends mechanically disengaging the pump from
the piping system. This can be achieved with flexible tubing or
pipes, for example. This will avoid transferring to the system
any pump oscillations that may arise.
Connecting pump
A marking on the pump head shows the direction of flow.
Confusion between suction and pressure sides can lead to
breakage of connected components on the suction and pres-
sure sides.
1. Remove the protective plugs from the hose connection
threads.
2. The accessories silencer, filter, and hose connectors (where
applicable) are screwed into the port threads.
Mount the silencer at the pressure side if necessary.
3. Connect the suction line and pressure line (see Chapter 4,
Tab. 11 for mounting dimensions).
4. Lay the suction and pressure line at a downward angle to pre-
vent condensate from running into the pump.
Connected
components
Pump exhaust
Disengaging