KNF N86.16 Series User manual

KNF121260-121531 04/20
OEM
N86.16
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
DIAPHRAGM VACUUM
PUMPS AND
COMPRESSORS
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........................................................................................ 6
4. Technical Data.......................................................................... 9
5. Design and function ................................................................ 11
6. Transportation......................................................................... 12
7. Installation and connection ..................................................... 13
8. Operation ................................................................................ 17
9. Servicing ................................................................................. 19
10. Troubleshooting ...................................................................... 24
11. Spare parts and accessories .................................................. 26
12. Returns ................................................................................... 27
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax [phone]
E-mail: [e-mail]
www.knf.de

Diaphragm Vacuum Pumps N86.16 About this document
Translation of original Operating and Installation Instructions, english, KNF121260-121531 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.
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 Pumps N86.16
4 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
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.
Operating parameter and
conditions
Requirements for
transferred medium

Diaphragm Vacuum Pumps N86.16 Use
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2.2. Improper use
The pumps may not be operated in an explosive atmosphere.
The pumps are not suitable for transferring:
dusts
liquids
aerosol
biological and microbiological substances
fuel
explosive and combustible materials
fibers
oxidizing agent
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 Pumps N86.16
6 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
3. Safety
Note the safety precautions in Chapter 7. Installation and con-
nection
and 8. 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.
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.
Note that the temperature of the medium increases when the pump
compresses the medium.
Personnel
Working in a safety
conscious manner
Handling dangerous media
Handling combustible media

Diaphragm Vacuum Pumps N86.16 Safety
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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.
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 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.
The following harmonized standards have been used:
DIN EN 50581
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 60335-1
Environmental protection
EU/EC Directives / Standards

Safety Diaphragm Vacuum Pumps N86.16
8 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
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

Diaphragm Vacuum Pumps N86.16 Technical Data
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4. Technical Data
Pump materials
Assembly
Material
N86AT.16E
Material
N86ST.16E
Pump head
Aluminium
alloy
Stainless
Steel
Diaphragm
PTFE
PTFE
Valve plate
PTFE
PTFE
Tab. 2
Pneumatic values
Parameter
Value
Max. permissible operating
pressure [bar]
1.5
Ultimate vacuum [mbar abs.]
290
Delivery rate at atm. pressure
[l/min]*
6.0
Tab. 3 *Liters in standard state (1013 mbar)
Pneumatic Connections
Pump type
Value
N86AT.16E
Thread size G 1/8’
N86ST.16E
Thread size G 1/8’
Tab. 4
Electrical data
Parameter
Value
Electrical data
See type plate
Protection class Motor
See type plate
Protection class Pump
IP00
Maximum permitted mains
voltage fluctuations
See type plate
Tab. 5
The pumps are fitted as standard with a thermal-switch to pro-
tect against overloading
.
Project-specific pumps that are not fitted with a thermal switch
must be protected by the user against the risk of overheating.
Weight
Pump type
Value [kg]
N86AT.16E
1.3
N86ST.16E
1.5
Tab. 6
Thermal switch

Technical Data Diaphragm Vacuum Pumps N86.16
10 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
Other parameters
Parameter
Value
Permissible ambient tempera-
ture [°C]
+ 5 bis + 40
Permissible media tempera-
ture [°C]
+ 5 bis + 240
Dimensions
See Fig. 3, Chapter 7.1
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
Gas-tightness* of pump head
< 6 x 10-3 mbar l/s**
Tab. 7
*After opening the pump head or replacing the diaphragms and valve
plates the gas-tightness is no longer guaranteed. A leak test is able to ver-
ify that the original standard of gas-tightness has been achieved.
**Values valid for helium leak test

Diaphragm Vacuum Pumps N86.16 Design and function
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5. Design and function
Design
Fig. 1: Design N86.16
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 Electrical connection
4 Fan
1 Outlet valve
2 Inlet valve
3 Transfer chamber
4 Diaphragm
5 Eccentric
6 Connection rod
7 Pump drive

Transportation Diaphragm Vacuum Pumps N86.16
12 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
6. Transportation
CAUTION
Personal injury and/or damage to property because
of false or improper transportation of the pump
Due to false or improper transportation the pump can
fall down, become damaged and injure people.

If necessary, use suitable aids (eyebolt, harness,
lifting device, etc.).

If necessary, wear proper personal protective
equipment (e.g. safety gloves, safety shoes).
CAUTION
Danger of injury due to sharp edges on the package
When handling or opening the package there is the
possibility of injury by cutting at sharp edges.

If necessary, wear proper personal protective
equipment (e.g. safety gloves).
Carry the pump in the original packaging up to its place of in-
stallation.
Retain the original packaging of the pump (e.g. for later stor-
age).
Check the pump for transport damages after receipt.
Document occurred transport damages in writing and with pic-
tures.
If necessary, remove the transport safety devices before com-
missioning the pump.
Parameter
Parameter
Value
Storage temperature
+ 5°C to + 40°C
Transport temperature
- 10°C to + 60°C
Permiss. humidity (non-con-
densing)
30% to 85%
Tab. 8

Diaphragm Vacuum Pumps N86.16 Installation and connection
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7. 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).
Since the insulating material of the heating elements is hygro-
scopic, before connecting the heating element, it may be nec-
essary to check the insulation resistance with a suitable meas-
uring instrument (megaohmmeter with 500V DC test voltage,
R
min = 5 MΩ), depending on the type of heating element and
the storage conditions (e.g. high humidity). If necessary, the
heating element should be dried at an increased temperature
(at about 120°C in the oven.
Time: some hours, until accepta-
ble measured values are reached).
7.1. Installation of the pump
Before installation, store the pump at the installation location to
bring it up to ambient temperature.
See Fig. 3 (pump series N86.16) for mounting dimensions.
Fig. 3: Mounting dimensions pump series N86.16 (All dimensional toler-
ances conform to DIN ISO 2768-1, Tolerance Class V)
Heating element
Mounting dimensions

Installation and connection Diaphragm Vacuum Pumps N86.16
14 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
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.
Make sure that reaching into the fan is avoided.
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.
Cooling air supply
Immediate ambient of the hot
pump parts
Installation location
Foreign matter protection

Diaphragm Vacuum Pumps N86.16 Installation and connection
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7.2. 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).
The pumps are fitted as standard with a thermal switch
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. Connect the earth (ground) wire to the motor.
3. Connect the mains cables.
Attach connection cables
Thermal switch

Installation and connection Diaphragm Vacuum Pumps N86.16
16 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
7.3. 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).
Protect the pump with a pressure relief device between the
pressure connection of the pump and the first shut-off valve.
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. Connect the suction line and pressure line (see Chapter 4,
Tab. 7 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
Pressure relief device
Pump exhaust
Disengaging

Diaphragm Vacuum Pumps N86.16 Operation
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8. 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 10. 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 Pumps N86.16
18 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
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.
Project-specific pumps that are not fitted with a thermal switch
must be protected by the user against the risk of overheating.
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
trigging device for PTC sensors or 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 9.2.1) 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 Pumps N86.16 Servicing
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9. Servicing
9.1. Servicing schedule
Component
Servicing interval
Pump
-
Periodic inspection for external
damage or leakage.
- Periodic inspection for noticeable
changes to noises and vibrations
Diaphragm and valve
plates
-
Replace no later than if there is a
decrease in the pump flow rate.
- Replace if the pressure or flow rate
of the pump changes without ap-
parent reason.
Tab. 9
9.2. Cleaning
When cleaning, make sure that no liquids enter the inside of
the housing.
9.2.1. Flushing pump
When transferring dangerous and environmentally hazardous me-
dia, KNF recommends flushing the pump at atmospheric pressure
for a few minutes prior to switch-off (if necessary for safety rea-
sons: with an inert gas) to extend the service life of the diaphragm.
Discharge the media safely.
9.2.2. Cleaning pump
CAUTION
Risk of burns from hot pump parts
The pump head or motor may still be hot after opera-
tion of the pump.

Allow pump to cool after operation.
WARNING
Health hazard due to dangerous substances
in the pump
Depending on the medium being transferred, caustic
burns or poisoning is possible.

Wear protective equipment if necessary, e.g.
protective gloves, googles.

Clean pump with suitable measures.
Solvents should only be used during cleaning if head materials
are not affected (ensure resistance of the material).
If compressed air is available, blow out parts.

Servicing Diaphragm Vacuum Pumps N86.16
20 Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
9.3. Replacing diaphragm and valve plates
Disconnect the motor from mains and ensure that it is voltage-
free.
Allow the pump and the motor to cool
Clean the pump and free the pump of hazardous materials.
Remove the hoses/pipes from the pneumatic pump inlet and
outlet.
Spare part*
Quantity
Valve plate
1
Wave diaphragm (assembly
consisting of two equivalent
parts)
1
O-ring
1
Tab. 10 according to spare parts list, Chapter 11.1
Tools/Material
Fork wrench or socket wrench 5.5 mm
Pin-wrench for two hole nuts, pin diameter 4 mm (available as
“wrench for retainer plate”, a KNF accessory, see Chapter 11.2)
Holding tool (see accessory, Chapter 11.2).
Heat-resistant thread adhesive (e.g. DELO ML 5327)
Felt-tip pen
Tab. 11
Always replace the diaphragm and valve plate together to
maintain the pump performance.
Change the diaphragm and valve plate in the following sequence:
a) Preparatory step
b) Removing pump head
c) Changing diaphragm
d) Changing valve plate and sealing ring
e) Refitting pump head
f) Final step
Requirements
Spare parts
Tools/material
Information on procedure