KNF 121252-121519 09/18
OEM
N 860, N 880
TRANSLATION OF ORIGINAL OPERATING AND
ENGLISH
INSTALLATION INSTRUCTIONS
DIAPHRAGM VACUUM
PUMP
Note!
Before operating the pump and the accessories, please read the operating instructions and pay attention to
the safety precautions!
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone +49-(0)7664-5909-0
Fax +49-(0)7664-5909-99
E-mail: info@knf.de
www.knf.de
Contents Page
About this document ................................................................. 3
1.
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
diaphragm vacuum pump N 860, N 880 About this document
A danger is located here.
Possible consequences of a failure to observe the
warning are specified here. The
Warning, indicates the danger level.
Signal word
Meaning
Consequences if not observed
DANGER
warns of immedi-
Death or serious injuries and/or
WARNING
warns of possible
Death or serious injuries and/or
CAUTION
warns of a possi-
Minor injuries or damage are
This symbol refers to important information.
Project pump
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 Instructions.
For project pumps, also observe the agreed upon specifica-
tions.
1.2. Symbols and markings
Warning
WARNING
Measures for avoiding the danger and its conse-
quences are specified here.
Danger levels
ate danger
danger
bly dangerous
situation
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.
serious damage are the consequence.
serious damage are possible.
possible.
signal word, e.g.
Original-Operating and Installation Instructions, english, KNF 121252-121519 09/18 3
Use diaphragm vacuum pump N 860, N 880
Operating parameter and
Requirements for
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
conditions
transferred medium
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 protected 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 transferred 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 microbiological substances.
The pumps are not suitable for transferring fuel.
The pumps are not suitable for transferring explosive and combustible 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 aggressive 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.
4 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Safety
Note the safety precautions in Chapter 6. Installation and connection
Personnel
Working in a safety
Handling dangerous media
Handling combustible media
3. Safety
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 withstand 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 Operating and Installation Instructions, and in particular the “Safety” chapter.
and 7. Operation.
conscious manner
Observe the accident prevention and safety regulations when performing any work on the pump and during operation.
Ensure that the pump is 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.
For pumps with dynamic mass balancing (.22-versions):
If the pump is mounted on a platform that is itself a vibrating system, or contains one, care must be taken that the two systems do
not interfere each other.
When transferring dangerous media, observe the safety regulations 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.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 5
Safety diaphragm vacuum pump N 860, N 880
Environmental protection
EU/EC Directives / Standards
Note that the temperature of the medium increases when the pump
compresses the medium.
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.
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 situation.
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 international 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 assembled
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 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
6 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Safety
Customer service and
The pump is maintenance-free. But KNF recommends, checking
repairs
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.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 7
Technical Data diaphragm vacuum pump N 860, N 880
Assembly
Material AN
Material AT
Material FT
Pump head
Aluminum
Aluminum
PTFE
Structured dia-
EPDM
PTFE
PTFE
Valves
EPDM
FFPM
FFPM
Assembly
Material
Pump head
Aluminum alloy
Structured diaphragm
EPDM
Valves
FPM
Parameter
Value
Value
Value
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
Pump type
Value
Thread size
G 3/8
Parameter
Value
Electrical data
See type plate
Protection class Motor
IP 54
Maximum permitted mains
+/- 10%
The pumps are fitted as standard with a thermal-switch to protect against overloading (see operating instructions of the motor).
Thermal switch
4. Technical Data
Pump materials
N 860, N 860.3
alloy
phragm
Tab. 2
N 880.3
Tab. 3
Pneumatic values
Tab. 4 *Liters in standard state (1013 mbar)
Pneumatic Connections
N 860
alloy
N 860.3
N 880.3
Tab. 5
Electrical data
voltage fluctuations
Tab. 6
8 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Technical Data
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
Parameter
Value
Permissible ambient temperature
+ 10°C bis + 40°C
Permissible media tempera-
+5 °C bis + 240°C
Dimensions:
N 880.3 AN.22E
see Fig. 7, Chapter 6.1
Maximum permissible ambient
80% for temperatures up to
50% at 40°C.
Max. altitude of site:
See operating instruction mo-
Weight
Tab. 7
Other parameters
ture
N 860 A_E
N 860 FTE
N 860.3 A_E
N 860.3 FTE
relative humidity
[m above sea level]
see Fig. 3, Chapter 6.1
see Fig. 4, Chapter 6.1
see Fig. 5, Chapter 6.1
see Fig. 6, Chapter 6.1
31 °C, linearly decreasing to
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.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 9
Design and function diaphragm vacuum pump N 860, N 880
1 Pneumatic pump outlet
1 Outlet valve
5. Design and function
Design
2 Pneumatic pump inlet
3 Pump head
4 Motor
5 Fan cover
6 Electrical terminal box
7 Pneumatic head connection
2 Inlet valve
3 Transfer chamber
4 Diaphragm
5 Eccentric
6 Connection rod
7 Pump drive
Fig. 1: Design N 880.3 AN.22E
Function Diaphragm Pump
Fig. 2: Pump head
Diaphragm pumps transfer, compress (depending on pump version) 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.
10 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Installation and connection
Mounting dimensions
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 tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 11
Installation and connection diaphragm vacuum pump N 860, N 880
Fig. 4: Mounting dimensions pump series N 860 FTE (All dimensional tolerances 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)
12 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Installation and connection
Danger of burns from hot surfaces
Hot surfaces may be caused by overheating of
pump.
Install the pump so that the motor fan can intake
Cooling air supply
Immediate ambient of the hot
Fig. 6: Mounting dimensions pump series N 860.3 FTE (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
pump parts
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 13
Fig. 7: Mounting dimensions pump series N 880.3 AN.22E (All dimensional tolerances conform to DIN ISO 2768-1, Tolerance Class V)
the
WARNING
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).
Installation and connection diaphragm vacuum pump N 860, N 880
The IP protection class of the pump motor is indicated on the
type plate.
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.
Installation location
Foreign matter protection
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.
WARNING
Make sure that vibrations of the pump do not re-
sult in hazards associated with adjacent components.
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 systems 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 f
lower values of f
ancing cannot be guaranteed.
14 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
> 1.7 Hz. For
ei
correct operation of the dynamic mass bal-
ei
diaphragm vacuum pump N 860, N 880 Installation and connection
Extreme danger from electrical shock
have the pump connected by an authorized
For max. operating current of the pump see pump’s type plate.
The pumps are fitted as standard with a thermal switch
ating instructions of the motor).
The 3~ motors are provided for the operation with frequency
converter.
The voltage must not vary by more than + 10% and – 10%
from that shown on the type plate.
Attach connection cables
6.2. Electrical connection
Only
specialist.
DANGER
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 overloading).
Only have the pump connected when the power
supply is disconnected.
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).
to protect against overloading (connection according to oper-
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.
2. Open terminal box cover.
3. Connect the earth (ground) wire to the motor.
4. Connect the mains cables according to the operating instruc-
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 15
tion of the motor.
Installation and connection diaphragm vacuum pump N 860, N 880
Personal injury or damages to property by ejected
protective
If the
pump hasn’t been removed, it could be ejected because of the overpressure during operation.
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 pressure sides.
Connected
Pump exhaust
5. Close the terminal cover box.
6.3. Pneumatic connection
plugs
components
CAUTION
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
1. Remove the protective plugs from the hose connection
threads.
protective plug at the pressure side of the
Remove the protective plug during the installa-
tion.
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 prevent condensate from running into the pump.
16 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Operation
Danger of burns from hot pump parts or hot medium
During or after operation of the pump, some pump
parts may be hot.
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.
Hazard of the pump head bursting due to excessive
pressure increase
Only throttle or regulate the air or gas quantity in
7. Operation
WARNING
WARNING
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.
Allow the pump to cool after operation.
Take safety precautions against the contact of
hot parts/media.
Don’t look into the pump’s inlet or outlet during
the operation.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 17
WARNING
Do not exceed max. permissible operating pres-
sure (see Chapter
Monitor pressure during operation.
If the pressure exceeds the maximum permissi-
ble operating pressure, immediately switch off
pump and eliminate fault (see Chapter
bleshooting).
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.
4. Technical Data).
9. Trou-
Operation diaphragm vacuum pump N 860, N 880
Excessive pressure (with all of the related hazards) can be prevented by placing a bypass line with a pressure
tween the pressure and suctions sides of the pump. For further
information, contact our technical adviser (contact data: see
www.knf.com).
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 after cooling down.
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
switches off.
Pump standstill
Vapors as media
Switching off the pump /
WARNING
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 thermal switch, and the pump
Make sure that normal atmospheric pressure is present in the
lines during switch-on.
-relief valve be-
removing from operation
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).
18 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Servicing
Component
Servicing interval
Pump - Regular inspection for external
damage or leaks
Diaphragm and valve
Replace at the latest, when pump
When cleaning, make sure that no liquids enter the inside of
the housing.
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred,
burns or poisoning are possible.
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.
For two-headed pumps:
The process of replacing diaphragms and valve plates/sealings
should be completed separately for each individual head before starting work on the next one. This will prevent from mixing up parts.
Conditions
8. Servicing
8.1. Servicing schedule
-
plates
Tab. 9
8.2. Cleaning
output decreases
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 increase the service life of the diaphragm.
8.2.2. Cleaning pump
Pump disconnected from mains and de-energized
WARNING
Wear protective clothing if necessary, e.g. pro-
tective gloves.
caustic
CAUTION
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
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 19
Allow the pump to cool off after operation.
Servicing diaphragm vacuum pump N 860, N 880
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-
1
Felt tip pen
1
Health hazard due to dangerous substances
in the pump!
Depending on the
burns or poisoning are possible.
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.
The position numbers in the following text refer to Fig. 8 and
Fig.
Conditions
Spare parts/tools
Information on procedure
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.
ended spanner 22 mm) and open-ended
spanner 24 mm
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
substance transferred, caustic
Wear protective clothing if necessary, e.g. pro-
tective gloves.
CAUTION
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
9.
20 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Servicing
1 Housing
Fig. 8: Pump heads ANE and ATE types (symbolic)
2 Intermediate plate
3 Ribbed plate
4 Hexagon socket head cap
screw
5 Valve plates/sealings
6 Does not exist
7 Structured diaphragm
8 Diaphragm spacer(s)
9 Connecting rod
10 Pneumatic connection
11 Union
12 Fan cover
M Marking
Fig. 9:
a.) Preparatory steps
1. Turn off power, check and test that the lines are not live.
2. For two-headed pumps:
Unscrew the fittings (11) of the pneumatic head connections
(10) and pull the connection upwards.
3. Undo the screws that hold the fan cover (12) and remove the
fan cover from the motor.
b.) Removing pump head (for each head separately)
1. Mark a mark (M) on the ribbed plate (3), intermediate plate (2),
and housing (1) with a felt-tip pen. This is to ensure that the
parts will be reassembled correctly at a later stage.
2. Undo the four screws (4) in the ribbed plate and lift the ribbed
plate with the intermediate plate off the pump housing.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 21
Servicing diaphragm vacuum pump N 860, N 880
c.) Changing diaphragm
1. Position the pump so that the diaphragm surface is upwards.
2. Turn the fan to bring the structured diaphragm (7) to top dead
centre.
3. Using a small screwdriver, between the housing and the outer
edge of the structured diaphragm, carefully lift the edge of the
diaphragm lightly upwards at one point (marking sure not to
damage the housing). Now grip the edge of the diaphragm on
opposite sides, unscrew it by turning anti-clockwise.
4. Take the diaphragm spacer(s) (8) off the connecting rod (9)
and retain them.
5. Check that all parts are free from dirt and clean them if necessary (see Chapter 8.2 Cleaning).
6. Put the diaphragm spacer(s) on the thread of the new diaphragm.
7. Fit the new structured diaphragm (7): hold the connecting rod
(9) with one finger, and gently screw in (clockwise) the structured diaphragm with diaphragm spacers.
8. Turn the fan until the structured diaphragm is at the top dead
centre. Using a small screwdriver, between the housing and
the outer edge of the structured diaphragm, carefully lift the
edge of the diaphragm lightly upwards at one point. Now grip
the edge of the diaphragm on opposite sides and tighten the
structured diaphragm clock-wise (hand-tight).
d.) Changing valve plates/sealings
1. Separate the ribbed plate (3) from intermediate plate (2).
2. Remove the valve plates/sealings (5) from the intermediate
plate.
3. Check that the valve seats, the ribbed plate and intermediate
plate are clean. If scratches, distortion, or corrosion are evident
on these parts they should be replaced.
4. Lay the new valve plate/sealings (5) in the recesses in the intermediate plate. The valve plates/sealings for suction and
pressure sides are identical, as are upper and lower sides of
the valve plates/sealings.
e.) Refitting pump head
1. Turn the fan to bring the structured diaphragm (7) to medium
position.
2. Place the intermediate plate (2), with valve plates/sealings (5)
and ribbed plate (3) on the housing, in the position indicated by
the marking (M).
3. Gently tighten the screws (4), evenly and diagonally.
4. Turn the fan to check that the pump rotates freely.
22 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Servicing
Spare part/tool
Quantity
Spare part kit*
1
Screwdriver blade with 2 mm
1
Phillips screwdriver No. 2
1
Felt tip pen
1
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
burns or poisoning are possible.
Danger of burns from hot pump parts
The pump head or motor may
pump has been shut off.
Conditions
Spare parts/tools
Information on procedure
5. Now tighten screws (4) firmly (tightening-torque: 8 Nm).
For two-headed pumps:
Repeat operation b.), c.), d.) and e.) for the second pump head.
f.) Final steps
1. For two-headed pumps:
Refit the pneumatic head connection (10). When tightening the
union (11), prevent the unit from slewing by using a spanner.
2. Refit the fan cover (12).
3. Reconnect the pump to the electricity supply.
If you have any questions about servicing call out technical adviser
(contact data: see www.knf.com).
8.3.2. FTE-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.
Tab. 11 *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
Wear protective clothing if necessary, e.g. pro-
tective gloves.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 23
CAUTION
Allow the pump to cool off after operation.
be hot even after the
Servicing diaphragm vacuum pump N 860, N 880
The position numbers in the following text refer to Fig. 10.
1 Top plate
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
2 Head plate
3 Intermediate plate
4 Housing
5 Cross recessed raised
countersunk head screw
6 Structured diaphragm
7 Diaphragm spacer(s)
8 Connecting rod
9 Cross recessed raised
10 Disk spring
11 Valve plate/sealing
cheese head screw
Fig. 10: Pump heads FTE types (symbolic)
a.) Preparatory steps
1. Turn off power, check and test that the lines are not live.
2. For two-headed pumps:
On the pneumatic head connections, loosen one of the union
nuts by hand. Then slightly loosen the angle-fitting in the pump
head by turning it anti-clockwise, so that the connecting tube
can be pulled out.
3. Undo the screws that hold the fan cover (see Fig. 9/12) and remove the fan cover from the motor.
b.) Removing pump head (for each head separately)
1. Make a mark (M) on the top plate (1), head plate (2), intermediate plate (3) and housing (4) with a felt-tip pen. This is to ensure that the parts will be reassembled correctly at a later
stage.
2. Undo the eight screws (5) and lift the pump head off the housing (4).
24 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Servicing
c.) Changing diaphragm
1. Position the pump so that the diaphragm surface is upwards.
2. Turn the fan to bring the structured diaphragm (6) to top dead
centre.
3. Using a small screwdriver, between the housing and the outer
edge of the structured diaphragm, carefully lift the edge of the
diaphragm lightly upwards at one point (making sure not to
damage the housing). Now grip the edge of the diaphragm on
opposite sides, unscrew it by turning anti-clockwise.
4. Take the diaphragm spacer(s) (7) off the connecting rod (8)
and retain them.
5. Check that all parts are free from dirt and clean them if necessary (see Chapter 8.2 Cleaning).
6. Put the diaphragm spacer(s) (7) on the thread of the new diaphragm.
7. Fit the new structured diaphragm (6): hold the connecting rod
(8) with one finger, and gently screw in (clockwise) the structured diaphragm with diaphragm spacers.
8. Turn the fan until the structured diaphragm is at the top dead
centre. Using a small screwdriver, beween the housing and the
outer edge of the structured diaphragm, carefully lift the edge
of the diaphragm lightly upwards at one point. Now grip the
edge of the diaphragm on opposite sides (do not over-stretch
the diaphragm!) and tighten the structured diaphragm clockwise.
d.) Changing valve plates/sealings
1. Undo the two screws (9).
2. Separate the head plate (2) with top plate (1) from intermediate
plate (3).
3. Remove the valve plates/sealings (11) from the intermediate
plate.
4. Check that the valve seats, the head plate and intermediate
plate are clean. If scratches, distortion, or corrosion are evident
on these parts they should be replaced.
5. Lay the new valve plates/sealings (11) in the recesses in the
intermediate plate. The valve plates (sealings for suction and
pressure sides are identical, as are upper and lower sides of
the valve plates/sealings.
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 25
Servicing diaphragm vacuum pump N 860, N 880
e.) Refitting pump head
1. Turn the fan to bring the structured diaphragm (6) to medium
position.
2. Place the intermediate plate (3), with valve plates/sealings (11)
on the housing, in the position indicated by the marking (M).
3. Place the head plate (2) on the intermediate plate (3) in the position indicated by the marking (M).
4. Place top plate (1) in position and insert screws (9) with disk
springs (10), and tighten them until the screw heads are just
fully seated (do not completely tighten them!).
The concave side of the first three disk springs must point
away from the screw head, the next three towards it (see
Fig. 10, detail X).
5. Gently tighten the screws (5), evenly and diagonally.
6. Turn the fan to check that the pump rotates freely.
7. Now tighten screws (5) firmly (tightening-torque: 8 Nm).
8. Tighten each of the screws (9) a half turn more (tighteningtorque: 20 Ncm).
For two-headed pumps:
Repeat operation b.), c.), d.) and e.) for the second pump head.
f.) Final steps
1. For two-headed pumps:
Refit the pneumatic head connection:
Place tube onto the connecting part of the angle fitting, turn angle fitting to a straight position and tighten the nut.
2. Refit the fan cover.
3. Reconnect the pump to the electricity supply.
If you have any questions about servicing call our technical adviser
(contact data: see www.knf.com).
26 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Troubleshooting
Extreme danger from electrical shock!
Pump does not transfer
Cause
Fault remedy
Pump not connected to the
Connect pump to the mains.
No voltage in power source.
Check room fuse and switch on if necessary.
Thermal switch of the pump has
Disconnect pump from mains.
Trace cause of over-heating and eliminate it.
Connections or lines blocked.
Check connections and lines.
Remove blockage.
External valve is closed or filter
Check external valves and filters.
Condensate has collected in
Detach the condensate source from the pump.
Install pump at highest point in system.
Diaphragm or valve plates/seal-
Replace diaphragm and valve plates/sealings (see Chapter
Flow rate, pressure or vacuum too low
Cause
Fault remedy
Condensate has collected in
Detach the condensate source from the pump.
Install pump at highest point in system.
There is gauge pressure on
Change the pressure conditions.
Pneumatic lines or connection
Disconnect pump from system to determine output values.
necessary.
Leaks occur on connections,
Eliminate leaks.
Connections or lines completely
Check connections and lines.
Head parts are soiled.
Clean head components.
Diaphragm or valve plates/seal-
Replace diaphragm and valve plates/sealings (see Chapter
9. Troubleshooting
Disconnect the pump power supply before work-
ing on the pump.
DANGER
Check the pump (see Tab. 12 and Tab. 13).
mains.
Make sure the pump is de-energized and se-
cure.
operated.
is clogged.
pump head.
ings are worn.
The pump does not achieve the output specified in the Technical data or the data sheet.
pump head.
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
suction side.
parts have an insufficient cross
section or are throttled.
Allow pump to cool.
Flush pump (see Chapter 8.2.1).
8.3).
Tab. 12
Flush pump (see Chapter 8.2.1).
Eliminate throttling (e.g. valve) if necessary.
Use lines or connection parts with larger cross section if
lines or pump head.
or partially jammed.
ings are worn.
Remove the jamming parts and particles.
8.3).
Tab. 13
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 27
Troubleshooting diaphragm vacuum pump N 860, N 880
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (contact data: see
www.knf.com).
1. Flush the pump to free the pump head of dangerous or aggressive gases (see Chapter 8.2.1).
2. Remove the pump.
3. Clean the pump (see Chapter 8.2.2).
4. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.
28 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Spare parts and accessories
Spare parts kit
Order No.
N 860 ANE
047496
N 860 _TE
047497
N 860.3 ANE
047498
N 860.3 _TE
047499
N 880.3 AN.22E
045387
10. Spare parts and accessories
10.1. Spare parts
A spare parts kit contains all parts needed for complete overhaul of
the pump head:
1x Diaphragm
2x Valve plates/sealings
Tab. 14
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 29
Returns diaphragm vacuum pump N 860, N 880
11. Returns
Pumps and systems used in laboratories and process-based
industries are exposed to a wide variety of conditions. This means
that the components contacting pumped media could become
contaminated by toxic, radioactive, or otherwise hazardous substances.
For this reason, customers who send any pumps or systems back
to KNF must submit a Health and safety clearance and decontamination form in order to avoid a hazardous situation for KNF employees. This Health and safety clearance and decontamination
form provides the following information, among other things:
physiological safety
whether medium-contacting parts have been cleaned
whether the equipment has been decontaminated
media that have been pumped or used
To ensure worker safety, work may not be started on pumps or
systems without a signed Health and safety clearance and decontamination form.
For optimal processing of a return, a copy of this declaration
should be sent in advance via e-mail, regular mail, or fax to KNF
Customer Service (contact data: see www.knf.com). In order to
avoid endangering employees who open the shipment’s packaging, despite any residual hazards, the original version of the Health
and safety clearance and decontamination form must accompany
the delivery receipt on the outside of the packaging.
The template for Health and safety clearance and decontamination
form is included with these Operating Instructions and may also be
downloaded from the KNF website.
The customer must specify the device type(s) and serial number(s)
in the Health and safety clearance and decontamination form in order to provide for the unambiguous assignment of the Declaration
to the device that is sent to KNF.
In addition to the customer’s declaration of physiological safety, information about operating conditions and der customer’s application are also of importance to ensure that the return shipment is
handled appropriately. Therefore, the Health and safety clearance
and decontamination form requests this information as well.
.
30 Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18
diaphragm vacuum pump N 860, N 880 Health and safety clearance and decontamination form
12. Health and safety clearance and decontamination form
Translation of original Operating and Installation Instructions, english, KNF 121252-121519 09/18 31
KNF worldwide
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