KNF N85.3 User manual

KNF 121258-121528 01/20
OEM
N85.3, N86
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
DIAPHRAGM 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 ................................................................ 12
6. Transportation......................................................................... 15
7. Installation and connection ..................................................... 16
8. Operation ................................................................................ 25
9. Servicing ................................................................................. 27
10. Troubleshooting ...................................................................... 36
11. Spare parts and accessories .................................................. 38
12. Returns ................................................................................... 39
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax [phone]
E-mail: [e-mail]
www.knf.de

Diaphragm pump N85, N86 About this document
Original-Operating and Installation Instructions, english, KNF 121258-121528 01/20 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 pump N85, N86
4 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases and
vapors.
Owner’s responsibility
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4. Technical Data.
Only complete pumps may be taken into service.
Make sure that the installation location is dry and the pump is pro-
tected against rain, splash, hose and drip water as well as other
pollutions.
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
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.
Operating parameter and
conditions
Requirements for
transferred medium

Diaphragm pump N85, N86 Safety
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 5
3. Safety
Note the safety precautions in Chapter 6. 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 specially trained personnel or trained and in-
structed 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-
energized.
The pump heads heat up during operation – avoid contact with
them.
Make sure that there are no hazards due to flow with open gas
connections, noises or hot gases.
Ensure that an EMC-compatible installation of the pump is ensured
at all times and that this cannot lead to a hazardous situation.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
If the diaphragm ruptures, the transferred medium will mix with the
air in the environment.
Take all necessary care to prevent this leading to a dangerous
situation.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium.
Personnel
Working in a safety
conscious manner
Handling dangerous media
Handling combustible media

Safety Diaphragm pump N85, N86
6 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
Hence, make sure the temperature of the medium is sufficiently
below the ignition temperature of the medium, even when it is
compressed to the maximum permissible operating pressure of the
pump. The maximum permissible operating pressure of the pump
is stated in the technical specifications (Chapter 4).
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
For pumps with AC motor:
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 inter-
national regulations. This especially applies to parts contaminated
with toxic substances.
For the purposes of the Machinery Directive 2006/42/EC, pumps
are “partly completed machinery”, and are therefore to be regarded
as not ready for use. Partly completed machinery may not be
commissioned until such time as it has been determined that the
machine in which the partly completed machinery is to be assem-
bled is in conformity with the provisions of the Machinery Directive
2006/42/EC. The following essential requirements of Annex I of
Directive 2006/42/EC (general principles) are applied and ob-
served:
−General Principles No. 1
−No. 1.1.2. / 1.1.3. / 1.3.1. / 1.3.3. / 1.3.4. / 1.4.1. / 1.5.1.* /
1.5.2.* / 1.5.8. / 1.5.9. / 1.7.4. / 1.7.4.1. / 1.7.4.3.
(*only for pumps with AC motor)
As these partly completed machinery are OEM-models the power
supplies and the equipment for disconnecting and switching-off the
partly completed machinery respectively have to be considered
when mounting as well as over-current and overload protective
gear.
In addition a protection against mechanical parts in motion and hot
parts, if existing, has to be provided when mounting.
The pumps conform to the Directive 2011/65/EU.
The following harmonized standards have been used:
N 85.3 K_E
N 86 K_E
N 85.3 K_DC
N 86 K_DC
N 86 K_DC-B
DIN EN 55014-1/2
DIN EN 55014-1/2
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 60034-1
DIN EN 61000-6-2/3
DIN EN 60335-1
DIN EN 61000-6-1/2
DIN EN 50581
DIN EN 50581
DIN EN 50581
Tab. 2
Environmental protection
EU/EC Directives / Standards

Diaphragm pump N85, N86 Safety
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 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
personnel only.
Use only genuine parts from KNF for servicing work.
Customer service and
repairs

Technical Data Diaphragm pump N85, N86
8 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
4. Technical Data
Pump materials
N85.3KN_
N86KN_
Assembly
Material
Pump head
PPS
Diaphragm
EPDM
Valves
EPDM
Tab. 3
N85.3KT_
N86KT_
Assembly
Material
Pump head
PPS
Diaphragm
PTFE-coated
Valves
FFPM
Tab. 4
Pneumatic values
N85.3K_E
N85.3K_DC
Parameter
Value
Max. permissible operating
pressure [bar g]
0.3
Ultimate vacuum [mbar abs.]
-N85.3KNE, N85.3KNDC
-N85.3KTE, N85.3KTDC
25
30
Delivery rate at atm. pressure
[l/min]*
5
Tab. 5 *Liters in standard state (1013 mbar)
N86KN_
Parameter
Value
Max. permissible operating
pressure [bar g]
-N86KNE, N86KNDC-B
-N86KNDC
2.4
1.5
Ultimate vacuum [mbar abs.]
100
Delivery rate at atm. pressure
[l/min]*:
-N86KNE, N86KNDC-B
-N86KNDC
6
6,5
Tab. 6 *Liters in standard state (1013 mbar)

Diaphragm pump N85, N86 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 9
N86KT_
Parameter
Value
Max. permissible operating
pressure [bar g]
-N86KTE, N86KTDC-B
-N86KTDC
2,5
1,5
Ultimate vacuum [mbar abs.]
160
Delivery rate at atm. pressure
[l/min]*:
-N86KTE, N86KTDC-B
-N86KTDC
5,5
6
Tab. 7 *Liters in standard state (1013 mbar)
Pneumatic Connections
Pump type
Value
N85.3
Thread size G 1/8
N86
Thread size G 1/8
Tab. 8
Electrical data
N85.3K__E
N86K_E
Parameter
Value
Voltage [V] / Frequencies [Hz]
See type plate
Max. operating current [A]
Pump power consumption
Protection class Motor
IP 00
Maximum permitted mains volt-
age fluctuations
± 10%
Tab. 9
The pumps are fitted with a thermo switch to protect against over-
loading:
WARNING
Automatic starting can cause personal injury and
pump damage
W
hen the operation of t
he pump is interrupted by the
thermal switch, the pump will restart automatically
after cooling down.

Take all necessary care to prevent this leading
to a dangerous situation.
Thermo switch

Technical Data Diaphragm pump N85, N86
10 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
N85.3K__DC
N86K_DC
Parameter
Value
Motor type
DC motor
Voltage [V]
See type plate
Max. operating current [A]
Protection class Motor
IP20
Maximum permitted mains
voltage fluctuations
± 10%
Tab. 10
The pumps are not protected against overloading and they
have no overcurrent protection.
N85.3K__DC-B
N86K_DC-B
Parameter
Value
Motor type
Brushless DC motor
Voltage [V]
See type plate
Max. operating current [A]
Protection class Motor
Maximum permitted mains
voltage fluctuations
± 10%
Motor type
IP30
Tab. 11
The pumps are not protected against overloading and they
have no overcurrent
protection.
Weight
Pump type
Value [kg]
N85.3K_E
1,25
N86K_E
1,1
N85.3K_DC
0,72
N86K_DC
0,58
N86K_DC-B
0,58
Tab. 12

Diaphragm pump N85, N86 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 11
Other parameters
Parameter
Value
Permissible ambient tempera-
ture
+ 5 bis + 40
Permissible media temperature
+ 5 bis + 40
Dimensions L x W x H [mm]
N85.3K_E
N86K_E
N85.3K_DC
N86K_DC
N86K_DC-B
ca. 131 x 75 x 109
ca. 104 x 91 x 69
ca. 129 x 50 x 105
ca. 106 x 74 x 43
ca. 108 x 88 x 54
Maximum permissible ambient
relative humidity
80 % for temperatures up to 31
°C, decreasing linearly to 50 %
at 40 °C
Max. altitude of site:
[m above sea level]
2000
Tab. 13

Design and function Diaphragm pump N85, N86
12 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
5. Design and function
Design N85.3K_E
Fig. 1: Design N85.3K_E
Design N86K_E
Fig. 2: Design N86K_E
1 Inlet (suction side)
2 Pneumatic connection
3 Outlet (pressure side)
4 Motor
5 Electrical connection
1 Outlet (pressure side)
2 Inlet (suction side)
3 Motor
4 Electrical connection

Diaphragm pump N85, N86 Design and function
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 13
Design N85.3K_DC
Fig. 3: Design N85.3K_DC
Design N86K_DC
Fig. 4: Design N86K_DC
1 Inlet (suction side)
2 Pneumatic connection
3 Outlet (pressure side)
4 Electrical connection
5 Motor
1 Outlet (pressure side)
2 Inlet (suction side)
3 Electrical connection
4 Motor

Design and function Diaphragm pump N85, N86
14 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
Design N86K_DC-B
Fig. 5: Design N86K_DC-B
Function Diaphragm Pump
Fig. 6: 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 Outlet (pressure side)
2 Inlet (suction side)
3 Electrical connection
4 Motor
1 Outlet valve
2 Inlet valve
3 Transfer chamber
4 Diaphragm
5 Eccentric
6 Connection rod
7 Pump drive

Diaphragm pump N85, N86 Transportation
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 15
6. Transportation
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).
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).
Only two-headed pump:
CAUTION
Personal injury and/or damage to property because
of false or
improper transportation of the pump
If the pump is
raised and/or carried on the connec-
tion during transport, leaks and/or damages to the
pump may result.

Do not carry the pump on the pneumatic connec-
tion.
Transport the pump in the original packaging to the installation
location.
Store the original packaging of the pump (e.g., for later stor-
age).
Inspect the pump for transport damage after receiving it.
Document any transport damage in writing.
Remove any transport safeguards on the pump prior to com-
missioning.
Parameter
Parameter
Value
Storage temperature [°C]
+ 5 to + 40
Transport temperature [°C]
- 10 to + 60
Permissible humidity (non-
condensing) [%]
30 to 85
Tab. 14
Before putting into operation, make sure that the pump has
reached the ambient temperature (see Chapter
4. Technical
Data
).

Installation and connection Diaphragm pump N85, N86
16 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
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).
7.1. Installation of the pump
Before installation, store the pump at the installation location to
bring it up to ambient temperature.
See Fig. 7 to Fig. 11 for mounting dimensions.
Fig. 7: Mounting dimensions pump series N85.3K_E
Mounting dimensions

Diaphragm pump N85, N86 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 17
Fig. 8: Mounting dimensions pump series N86K_E
Fig. 9: Mounting dimensions pump series N85.3K_DC

Installation and connection Diaphragm pump N85, N86
18 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
Fig. 10: Mounting dimensions pump series N86K_DC
Fig. 11: Mounting dimensions pump series N86K_DC-B

Diaphragm pump N85, N86 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20 19
Only for pumps with AC motor:
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.
Install the pump so that accidental finger contact with the fan is
impossible.
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 ser-
vice.
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 against grease and oils.
Protect the pump from vibrations and jolts.
Rubber feet (accessories) may be used to reduce noise, and
vibration. They are not suitable for mounting the pump on its
side, or suspended.
WARNING
Personal injury and/or damage to property because
of vibration
In conjunction with
adjacent components,
vibration of
the pump may result in crushing and/or damage to
these components.

Make sure that vibrations of the pump do not
result in hazards associated with adjacent com-
ponents.
Protect the pump against contact and intrusion of foreign mat-
ter.
Cooling air supply
Immediate ambient of the hot
pump parts
Installation location
Foreign matter protection

Installation and connection Diaphragm pump N85, N86
20 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
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.
It is recommended that an additional “Emergency Stop” switch
is installed.
The pump must be installed so that contact with live parts
(electrical connection) is impossible.
For pumps with AC motor:
The motors of the pump must be protected according to DIN
EN 60204-1 (protection against excess current, or overload-
ing).
For max. operating current of the pump see type plate.
For pumps with DC motor:
The pumps may only be operated in a SELV power circuit.
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).
Pumps with AC motor:
The pumps are
fitted as standard with a thermal switch to pro-
tect against overloading
.
Pumps with AC motor
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 motor wires.
Attach connection cables