KNF N860 User manual

KNF 121252-121519 09/18
OEM
N860, N880
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
DIAPHRAGM VACUUM
PUMP
Note!
Before operating the pump and the accessories, please read the operating instructions and pay attention to
the safety precautions!

Contents Page
1. About this document ................................................................. 3
2. Use............................................................................................ 4
3. Safety........................................................................................ 5
4. Technical Data.......................................................................... 8
5. Design and function ................................................................ 10
6. Installation and connection ..................................................... 11
7. Operation ................................................................................ 17
8. Servicing ................................................................................. 19
9. Troubleshooting ...................................................................... 27
10. Spare parts and accessories .................................................. 29
11. Returns ................................................................................... 30
12. Health and safety clearance and decontamination form ........ 31
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax [phone]
E-mail: [e-mail]
www.knf.de

diaphragm vacuum pump N 860, N 880 About this document
Original-Operating and Installation Instructions, english, KNF 121252-121519 09/18 3
1. About this document
1.1. Using the Operating and Installation
Instructions
The Operating and Installation Instructions are part of the pump.
Always keep the Operating and Installation Instructions handy
in the work area.
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 860, N 880
4 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases and va-
pors.
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.
The gas-tightness of the connections between the application
pipes and the pump (or the pump connection) must be checked
regularly; with leaky connections, there is a danger that hazardous
gases or vapors may escape from the pump system.
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.
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.
Operating parameter and
conditions
Requirements for
transferred medium

diaphragm vacuum pump N 860, N 880 Safety
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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 is separated from the mains and is de-ener-
gized.
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.
For pumps with dynamic mass balancing (.22-versions):
If the pump is mounted on a platform that is itself a vibrating sys-
tem, or contains one, care must be taken that the two systems do
not interfere each other.
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 situ-
ation.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently be-
low the ignition temperature of the medium, to avoid ignition or ex-
plosion. This also applies for unusual operational situations.
Personnel
Working in a safety
conscious manner
Handling dangerous media
Handling combustible media

Safety diaphragm vacuum pump N 860, N 880
6 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
Note that the temperature of the medium increases when the pump
compresses the medium.
Hence, make sure the temperature of the medium is sufficiently be-
low the ignition temperature of the medium, even when it is com-
pressed 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 ra-
diation, that may add heat to the medium.
When the operation of the pump is interrupted by the thermal
switch, the pump will re-start automatically after cooling down.
Take all care necessary to prevent this leading to a dangerous situ-
ation.
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 pro-
tection regulations. Observe the respective national and interna-
tional 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 com-
missioned until such time as it has been determined that the ma-
chine in which the partly completed machinery is to be assembled
is in conformity with the provisions of the Machinery Directive
2006/42/EC. The following essential 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 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 (RoHS2).
The following harmonized standards have been used:
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 50581
DIN EN 60204-1
Environmental protection
EU/EC Directives / Standards

diaphragm vacuum pump N 860, N 880 Safety
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 7
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 per-
sonnel only.
Use only genuine parts from KNF for servicing work.
Customer service and
repairs

Technical Data diaphragm vacuum pump N 860, N 880
8 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
4. Technical Data
Pump materials
N 860, N 860.3
Assembly
Material AN
Material AT
Material FT
Pump head
Aluminum
alloy
Aluminum
alloy
PTFE
Structured dia-
phragm
EPDM
PTFE
PTFE
Valves
EPDM
FFPM
FFPM
Tab. 2
N 880.3
Assembly
Material
Pump head
Aluminum alloy
Structured diaphragm
EPDM
Valves
FPM
Tab. 3
Pneumatic values
Parameter
Value
N 860
Value
N 860.3
Value
N 880.3
Max. permissible operating
pressure [bar g]
1.0
1.0
1.0
Ultimate vacuum [mbar abs.]
80
2.0
2.0
Delivery rate [l/min]*
60
60
80
Tab. 4 *Liters in standard state (1013 mbar)
Pneumatic Connections
Pump type
Value
Thread size
G 3/8
Tab. 5
Electrical data
Parameter
Value
Electrical data
See type plate
Protection class Motor
IP 54
Maximum permitted mains
voltage fluctuations
+/- 10%
Tab. 6
The pumps are fitted as standard with a thermal-switch to pro-
tect against overloading (see operating instructions of the mo-
tor).
Thermal switch

diaphragm vacuum pump N 860, N 880 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 9
Weight
Pump type
Value
N 860 A_E
12.7 kg
N 860 FTE
12.7 kg
N 860.3 A_E
14.7 kg
N 860.3 FTE
14.2 kg
N 880.3 AN.22E
18.0 kg
Tab. 7
Other parameters
Parameter
Value
Permissible ambient tempera-
ture
+ 10°C bis + 40°C
Permissible media tempera-
ture
+5 °C bis + 240°C
Dimensions:
N 860 A_E
N 860 FTE
N 860.3 A_E
N 860.3 FTE
N 880.3 AN.22E
see Fig. 3, Chapter 6.1
see Fig. 4, Chapter 6.1
see Fig. 5, Chapter 6.1
see Fig. 6, Chapter 6.1
see Fig. 7, Chapter 6.1
Maximum permissible ambient
relative humidity
80% for temperatures up to
31 °C, linearly decreasing to
50% at 40°C.
Max. altitude of site:
[m above sea level]
See operating instruction mo-
tor
Tab. 8
Additional equipment (only .22-versions)
Pumps with the model code .22 (e.g. N 880.3 AN.22E) are fitted
with the patented dynamic mass balancing. This system eradicates
the imbalance that results from gas forces.

Design and function diaphragm vacuum pump N 860, N 880
10 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
5. Design and function
Design
Fig. 1: Design N 880.3 AN.22E
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 pump outlet
2 Pneumatic pump inlet
3 Pump head
4 Motor
5 Fan cover
6 Electrical terminal box
7 Pneumatic head connection
1 Outlet valve
2 Inlet valve
3 Transfer chamber
4 Diaphragm
5 Eccentric
6 Connection rod
7 Pump drive

diaphragm vacuum pump N 860, N 880 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 11
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.
See Fig. 3 to Fig. 7 for mounting dimensions.
Fig. 3: Mounting dimensions pump series N 860 A_E (All dimensional tol-
erances conform to DIN ISO 2768-1, Tolerance Class V)
Mounting dimensions

Installation and connection diaphragm vacuum pump N 860, N 880
12 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
Fig. 4: Mounting dimensions pump series N 860 FTE (All dimensional tol-
erances conform to DIN ISO 2768-1, Tolerance Class V)
Fig. 5: Mounting dimensions pump series N 860.3 A_E (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)

diaphragm vacuum pump N 860, N 880 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 13
Fig. 6: Mounting dimensions pump series N 860.3 FTE (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Fig. 7: Mounting dimensions pump series N 880.3 AN.22E (All dimen-
sional 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).
Cooling air supply
Immediate ambient of the hot
pump parts

Installation and connection diaphragm vacuum pump N 860, N 880
14 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
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.
The IP protection class of the pump motor is indicated on the
type plate.
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.
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 re-
sult in hazards associated with adjacent compo-
nents.
Protect the pump against contact and intrusion of foreign mat-
ter.
For pumps with dynamic mass balancing (.22-versions):
1. If the pump is mounted on a platform that is itself a vibrating
system, or contains one, care must be taken that the two sys-
tems do not interfere each other.
2. The pump must be supported on rubber mounts, or springs so
that the natural frequency of the systems is fei > 1.7 Hz. For
lower values of fei correct operation of the dynamic mass bal-
ancing cannot be guaranteed.
Installation location
Foreign matter protection

diaphragm vacuum pump N 860, N 880 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 15
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 60204-1) 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).
The pumps are fitted as standard with a thermal switch
to protect against overloading (connection according to oper-
ating instructions of the motor).
The 3~ motors are provided for the operation with frequency
converter.
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.
4. Connect the mains cables according to the operating instruc-
tion of the motor.
Attach connection cables

Installation and connection diaphragm vacuum pump N 860, N 880
16 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
5. Close the terminal cover box.
6.3. Pneumatic connection
CAUTION
Personal injury or damages to property by ejected
protective
plugs
If the
protective plug at the pressure side of the
pump hasn’t been removed, it could be ejected be-
cause of the overpressure during operation.

Remove the protective plug during the installa-
tion.
Only connect components to the pump which are designed for
the pneumatic data of the pump (see Chapter 4, Technical
Data).
If the pump s used as a vacuum pump, safely discharge the
pump exhaust at the pump’s pneumatic outlet.
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. Connect the suction line and pressure line (see Chapter 4,
Tab. 8 for mounting dimensions).
3. Lay the suction and pressure line at a downward angle to pre-
vent condensate from running into the pump.
Connected
components
Pump exhaust

diaphragm vacuum pump N 860, N 880 Operation
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 17
7. Operation
WARNING
Danger of burns from hot pump parts or hot medium
During or after operation of the pump, some pump
parts may be hot.

Allow the pump to cool after operation.

Take safety precautions against the contact of
hot parts/media.
WARNING
Injury of the eyes
During excessive approach to the inlet or outlet of
the pump, the eyes could be injured by the upcoming
vacuum or overpressure.

Don’t look into the pump’s inlet or outlet during
the operation.
Only operate the pumps under the operating parameters and
conditions described in Chapter 4. Technical Data.
Make sure the pumps are used properly (see Chapter 2.1).
Make sure the pumps are not used improperly (see Chapter
2.2).
Observe the safety precautions (see Chapter 3).
The pumps are intended for installation. Before putting them
into service it must be established that machinery or equipment
in which they are installed meets the relevant regulations.
WARNING
Hazard of the pump head bursting due to excessive
pressure increase

Do not exceed max. permissible operating pres-
sure (see Chapter 4. Technical Data).

Monitor pressure during operation.

If the pressure exceeds the maximum permissi-
ble operating pressure, immediately switch off
pump and eliminate fault (see Chapter 9. Trou-
bleshooting).

Only throttle or regulate the air or gas quantity in
the suction line to prevent the maximum permis-
sible operating pressure from being exceeded.

If the air or gas quantity in the pressure line is
throttled or regulated, make sure that the maxi-
mum permissible operating pressure is not ex-
ceeded.

Ensure that the pump outlet is not closed or con-
stricted.

Operation diaphragm vacuum pump N 860, N 880
18 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
Excessive pressure (with all of the related hazards) can be pre-
vented by placing a bypass line with a pressure
-relief valve be-
tween the pressure and suctions sides of the pump. For further
information, contact our technical adviser (contact data: see
www.knf.com).
WARNING
Automatic starting can cause personal injury and
pump damage
When the operation of the pump is interrupted by the
thermal switch, the pump will restart automatically af-
ter cooling down.

Take all necessary care to prevent this leading
to a dangerous situation.
With the pump at a standstill, open pressure and suction lines
to normal atmospheric pressure.
The pump may not start up against pressure or vacuum during
switch
-
on. This also applies in operating following a brief power
failure. If a pump starts against pressure or vacuum, it may
block. This activates
the thermal switch, and the pump
switches off.
Make sure that normal atmospheric pressure is present in the
lines during switch-on.
The life of the diaphragm is prolonged the formation of condensate
is avoided. Therefore the following precautions should be taken:
Run the pump for a few minutes to warm it up before handling
saturated or nearly saturated vapors.
KNF recommends: When transferring aggressive media, flush
the pump prior to switch off (see Chapter 8.2.1) to increase the
service life of the diaphragm.
Restore the system to normal atmospheric pressure (release
pneumatic pressure in pump).
Pump standstill
Vapors as media
Switching off the pump /
removing from operation

diaphragm vacuum pump N 860, N 880 Servicing
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 19
8. Servicing
8.1. Servicing schedule
Component
Servicing interval
Pump
-
Regular inspection for external
damage or leaks
Diaphragm and valve
plates
-
Replace at the latest, when pump
output decreases
Tab. 9
8.2. Cleaning
When cleaning, make sure that no liquids enter the inside of
the housing.
8.2.1. Flushing pump
When transferring aggressive media, flush the pump under at-
mospheric conditions some minutes with air (or, if necessary
for safety reasons, with an inert gas) prior to switch-off to in-
crease the service life of the diaphragm.
8.2.2. Cleaning pump
Pump disconnected from mains and de-energized
WARNING
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred,
caustic
burns or poisoning are possible.

Wear protective clothing if necessary, e.g. pro-
tective gloves.
CAUTION
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.

Allow the pump to cool off after operation.
Solvent should be used for cleaning only if the head materials
are not corroded (ensure compatibility of the material).
If compressed air is available, blow out the parts.
8.3. Replacing diaphragm and reed valves
For two-headed pumps:
The process of replacing diaphragms and valve plates/sealings
should be completed separately for each individual head be-
fore starting work on the next one. This will prevent from mix-
ing up parts.
Conditions

Servicing diaphragm vacuum pump N 860, N 880
20 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
8.3.1. AN_ and AT_-versions
Pump disconnected from mains and de-energized
Pump is clean and free of hazardous materials.
Hoses removed from pump’s pneumatic inlet and outlet.
Spare part/tool
Quantity
Spare part kit*
1
Allen key 4mm
1
Screwdriver blade with 2 mm
1
Phillips screwdriver No. 2
1
Ring spanner 22 mm (alternative: open-
ended spanner 22 mm) and open-ended
spanner 24 mm
1
Felt tip pen
1
Tab. 10 *see Chapter 10
Diaphragm and valve plates/sealings are the only parts of the
pump subject to wear. They are simple to change.
Always change diaphragm and valve plates/sealings at the same
time. If the diaphragm and the valve plates/sealings are not
changed at the same time the nominal performance of the pump is
not guaranteed after the servicing.
WARNING
Health hazard due to dangerous substances
in the pump!
Depending on the
substance transferred, caustic
burns or poisoning are possible.

Wear protective clothing if necessary, e.g. pro-
tective gloves.
CAUTION
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.

Allow the pump to cool off after operation.
Change the diaphragms and valve plates/sealings in the following
sequence:
a.) Preparatory steps
b.) Removing pump head
c.) Changing diaphragm
d.) Changing valve plates/sealings
e.) Refitting pump head
f.) Final steps
The position numbers in the following text refer to Fig. 8 and
Fig.
9.
Conditions
Spare parts/tools
Information on procedure