KNF N 816 User manual

KNF 312649-312652 02/23
OEM
N816
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.................................................................14
6. Transportation .........................................................................16
7. Installation and connection......................................................17
8. Operation.................................................................................31
9. Servicing..................................................................................39
10. Troubleshooting.......................................................................43
11. Spare parts and accessories...................................................46
12.Returns ....................................................................................47
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone [phone]
Fax [phone]
E-mail: [e-mail]
www.knf.de

Diaphragm pump N 816 About this document
Original-Operating and Installation Instructions, english, KNF 312649-312652 02/23 3
1. About this document
1.1. Using the Operating and Installation
Instructions
The Operating and Installation Instructions are part of the pump.
Pass on the Operating and Installation Instructions to the
next owner.
Customer-specific project pumps (pump models which begin with
“PJ” or “PM”) may differ from the Operating and Installation In-
structions.
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 imme-
diate 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 N 816
4 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
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 parame-
ters 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.
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 micro-
biological substances.
The pumps are not suitable for transferring fuel.
The pumps are not suitable for transferring explosive and com-
bustible 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 pump N 816 Safety
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 5
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 prop-
er working order, in accordance with their intended use, observ-
ing the safety advice within the Operating and Installation Instruc-
tions, 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 Op-
erating and Installation Instructions, and in particular the “Safety”
chapter.
Observe the accident prevention and safety regulations when
performing any work on the pump and during operation.
Ensure that the pump s separated from the mains and is de-
energized.
The pump heads heat up during operation – avoid contact with
them.
Make sure that there are no hazards due to flow with open gas
connections, noises or hot gases.
Ensure that an EMC-compatible installation of the pump is en-
sured at all times and that this cannot lead to a hazardous situa-
tion.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
If the diaphragm ruptures, the transferred medium will mix with
the air in the environment.
Take all necessary care to prevent this leading to a dangerous
situation.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the
pump compresses the medium (compressor operation).
Personnel
Working in a safety
conscious manner
Handling dangerous media
Handling combustible media

Safety Diaphragm pump N 816
6 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
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 inter-
national regulations. This especially applies to parts contaminat-
ed with toxic substances.
For the purposes of the Machinery Directive 2006/42/EC, pumps
are “partly completed machinery”, and are therefore to be re-
garded 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.
(*only 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 consid-
ered when mounting as well as over-current and overload protec-
tive gear.
In addition a protection against mechanical parts in motion and
hot parts, if existing, has to be provided when mounting.
The safety objectives of the following Directive(s) have been met:
−Directive 2011/65/EU on the restriction of the use of
certain hazardous substances in eletrical and electronic
equipment (Annex II amended by Commission Delegated
Directive (EU) 2015/863).
−Only pumps with AC motor:
Directive 2014/35/EU on the harmonisation of the laws of
Member States relating to electrical equipment designed
for use within certain voltage limits in accordance with
Annex I, No. 1.5.1. of the Directive 2006/42/EC.
Environmental protection
EU/EC Directives / Standards

Diaphragm pump N 816 Safety
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 7
The following harmonized standards were taken as a basis:
N 816 K_DC-B-M
N 816 K_DC-B
N 816 K_E
EN IEC 63000
EN IEC 63000
EN IEC 63000
EN IEC 61000-6-2/3
EN IEC 61000-6-2/3
EN IEC 55014-1/2
EN IEC 61000-3-2
EN 61000-3-3
EN 60335-1
Tab. 2
The pump is maintenance-free. But KNF recommends, checking
the pump regularly with regard to conspicuous changes in noise
and vibrations.
Only have repairs to the pumps carried out by the KNF Customer
Service responsible.
Housing with voltage-caring parts may be opened by technical
personnel only.
Use only genuine parts from KNF for servicing work.
Customer service and
repairs

Technical Data Diaphragm pump N 816
8 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
4. Technical Data
N 816 KNE and N 816 KTE
Pneumatic performance
Max. permissible
operating pressure [bar g]
0.5
Ultimate vacuum
[mbar abs.]
N 816 KN_
N 816 KT_
100
140
Flow rate at atm. pressure
[l/min]*
N 816 KN_
N 816 KT_
14
13
Pneumatic connections
Thread size
G 1/8
Ambient and media temperature
Permissible
ambient temperature
+ 5 °C to + 40 °C
Permissible media tempera-
ture
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
approx. 1.8
Dimensions L x H x W [mm]
See Fig. 5, Chapter 7.1
Maximum permissible am-
bient relative humidity
80 % for temperatures up to
31 °C, decreasing linearly to
50 % at 40 °C
Maximum altitude of instal-
lation [m above sea level]
2000
Electrical data
Motor type
AC-Motor
Voltage / Frequency**
100V / 50/60Hz ; 115V / 60Hz
230V / 50Hz ; 220V / 60Hz
Max. operating current [A]:
100V
50/60Hz
115V
60Hz
220V
60Hz
230V
50Hz
N 816 KN_
- for p > p
atm.
0.9/0.7
0.6
0.35
0.45
- for p < p
atm.
0.9/0.7
0.6
0.35
0.45
N 816 KT_
- for p > p
atm.
0.9/0.7
0.6
0.35
0.45
- for p < p
atm.
1.0/0.7
0.6
0.35
0.5
Max. power consumption of
the pump [W]:
100V
50/60Hz
115V
60Hz
220V
60Hz
230V
50Hz
N 816 KN_
- for p > p
atm.
75/64
64
64
79
- for p < p
atm.
75/63
62
61
76
N 816 KT_
- for p > p
atm.
78/63
61
65
76
- for p < p
atm.
78/62
58
62
75
Maximum permissible
mains voltage fluctuations
+/- 10 %
Motor protection class
IP 00
Tab. 3 (part 1) * liters in standard state (1013 mbar)
**further voltage and frequency versions on demand

Diaphragm pump N 816 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 9
Pump materials
Pump head
PPS
Diaphragm
N816 KN_
N816 KT_
EPDM
PTFE
Valve plate/sealing
N816 KN_
N816 KT_
EPDM
FFPM
Tab. 3 (part 2)
The pumps are fitted with a thermo switch to protect against over-
loading.
WARNUNG
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.

Take all necessary care to prevent this leading
to a dangerous situation.
Thermo switch

Technical Data Diaphragm pump N 816
10 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
N 816 KNDC-B and N 816 KN.29DC-B
N 816 KTDC-B and N 816 KT.29DC-B
Pneumatic performance
Max. permissible
operating pressure [bar g]
0.5
Ultimate vacuum
[mbar abs.]
N 816 KN_
N 816 KT_
100
140
Flow rate at atm. pressure
[l/min]*
N 816 KN_
N 816 KT_
16
14
Flow rate at atm. pressure
and 0.1 V control voltage
(only .29 version) [l/min]*
3.5
Pneumatic connections
Thread size
G 1/8
Ambient and media temperature
Permissible
ambient temperature
+ 5 °C to + 40 °C
Permissible media tempera-
ture
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
approx. 1.55
Dimensions L x H x W [mm]
See Fig. 6, Chapter 7.1
Maximum permissible am-
bient relative humidity
80 % for temperatures up to
31 °C, decreasing linearly to
50 % at 40 °C
Maximum altitude of instal-
lation [m above sea level]
2000
Electrical data
Motor type
Brushless DC motor
Voltage [V]**
24
Control voltage (only .29
version) [V]
0.1…5***
Max. operating current [A]:
- for p > patm.
- for p < patm.
N 816 KN_
N 816 KT_
1.4
1.2
1.3
1.1
Starting current
The starting current can be up to
50 % above the maximum operat-
ing current.
Starting ramp [ms]
800
Max. power consumption of
the pump [W]:
- for p > patm.
- for p < patm.
N 816 KN_
N 816 KT_
33
28
31
26
Maximum permissible
mains voltage fluctuations
+/- 10 %
Motor protection class
IP 20
Overcurrent limitation of the
motor electronics [A]
7.5
Tab. 4 (part 1) * liters in standard state (1013 mbar)
**further voltage versions on demand
*** further control voltage versions on demand

Diaphragm pump N 816 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 11
Pump materials
Pump head
PPS
Diaphragm
N816 KN_
N816 KT_
EPDM
PTFE
Valve plate/sealing
N816 KN_
N816 KT_
EPDM
FFPM
Tab. 4 (part 2)
The pump is protected against overheating by a temperature
sensor on the motor board and equipped with overcurrent pro-
tection.
If one of these safety functions is tri
ggered or if the maximum
blocking time of the rotor is exceeded due to a fault, the pump
will be shut down and must be manually reset, as follows:

Separate pump from the mains.

Remove the cause(s) of the fault before restarting.

Technical Data Diaphragm pump N 816
12 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
N 816 KN.29DC-B-M and N 816 KT.29DC-B-M
Pneumatic performance
Max. permissible
operating pressure [bar g]
0.5
Ultimate vacuum
[mbar abs.]
N 816 KN_
N 816 KT_
100
140
Flow rate at atm. pressure
[l/min]*
N 816 KN_
N 816 KT_
16
14
Flow rate at atm. pressure
and 0.1 V control voltage
(only .29 version) [l/min]*
3.5
Pneumatic connections
Thread size
G 1/8
Ambient and media temperature
Permissible
ambient temperature
+ 5 °C to + 40 °C
Permissible media tempera-
ture
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
approx. 1.05
Dimensions L x H x W [mm]
See Fig. 7, Chapter 7.1
Maximum permissible am-
bient relative humidity
80 % for temperatures up to
31 °C, decreasing linearly to
50 % at 40 °C
Maximum altitude of instal-
lation [m above sea level]
2000
Electrical data
Motor type
Brushless DC motor
Voltage [V]**
24
PWM signal [%]
20…100
Max. operating current [A]:
- for p > patm.
- for p < patm.
N 816 KN_
N 816 KT_
1.3
1.1
1.1
1.0
Starting current
The starting current can be up to
50 % above the maximum operat-
ing current.
Max. power consumption of
the pump [W]:
- for p > patm.
- for p < patm.
N 816 KN_
N 816 KT_
31
24
26
24
Maximum permissible
mains voltage fluctuations
+/- 10 %
Motor protection class
IP 30
Overcurrent limitation of the
motor electronics [A]
8
Tab. 5 (part 1) * liters in standard state (1013 mbar
**further voltage versions on demand

Diaphragm pump N 816 Technical Data
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 13
Pump materials
Pump head
PPS
Diaphragm
N816 KN_
N816 KT_
EPDM
PTFE
Valve plate/sealing
N816 KN_
N816 KT_
EPDM
FFPM
Tab. 5 (part 2)
The pump is equipped with overcurrent protection.
If this safety function is triggered, the pump will be shut down
and must be manually reset, as follows:

Separate pump from the mains.

Remove the cause(s) of the fault before restarting.
If the maximum blocking time of the rotor is exceeded due to a
fault, the pump will be shut down and must be manually reset,
as follows:

Separate pump from the mains or separate pump from
PWM signal.

Remove the cause(s) of the fault before restarting.

Design and function Diaphragm pump N 816
14 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
5. Design and function
Design
Fig. 1: Design N 816 K_E
Fig. 2: Design N 816 K_DC-B
1 Pneumatic pump outlet
2 Capacitor
3 Pneumatic pump inlet
4 Fan
5 Motor
1 Pneumatic pump outlet
2 Pneumatic pump inlet
3 Motor

Diaphragm pump N 816 Design and function
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 15
Fig. 3: Design N 816 K_DC-B-M
Function Diaphragm Pump
Fig. 4: 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 aspi-
rates the gas to be transferred via the inlet valve (2). In the up-
ward stroke, the diaphragm presses the medium out of the pump
head via the outlet valve (1). The transfer chamber (3) is hermeti-
cally separated from the pump drive (7) by the diaphragm.
1 Pneumatic pump outlet
2 Pneumatic pump inlet
3 Motor
1 Outlet valve
2 Inlet valve
3 Transfer chamber
4 Diaphragm
5 Eccentric
6 Connection rod
7 Pump drive

Transportation Diaphragm pump N 816
16 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
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).
Check the pump for transport damages after receipt.
Document occurred transport damages in writing and with
pictures.
Carry the pump in the original packaging up to its place of
installation.
Retain the original packaging of the pump (e.g. for later stor-
age).

Diaphragm pump N 816 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 17
7. Installation and connection
Only install and operate the pumps under the pneumatic operat-
ing 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. 5 (N 816 K_E), Fig. 6 (N 816 K_DC-B) and Fig. 7
(N 816 K_DC-B-M) for mounting dimensions.
Fig. 5: Mounting dimensions pump series N 816 K_E (All dimensional
tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Mounting dimensions

Installation and connection Diaphragm pump N 816
18 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
Fig. 6: Mounting dimensions pump series N 816 K_DC-B (All dimension-
al tolerances conform to DIN ISO 2768-1, Tolerance Class V)
Fig. 7: Mounting dimensions pump series N 816 K_DC-B-M (All dimen-
sional tolerances conform to DIN ISO 2768-1, Tolerance Class V)

Diaphragm pump N 816 Installation and connection
Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23 19
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).
The pump may be installed in any position. Use metal screws
to fasten the pump at the indicated attachment points.
In order to drain off possible condensate successfully, KNF
recommends that pumps are installed in oblique position (with
the suction line in higher position than the pressure line; for
flow direction s
ee the markings on the pump heads).
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 exposure to fats and oils.
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
result in hazards associated with adjacent com-
ponents.
Cooling air supply
Immediate ambient of the hot
pump parts
Installation position
Installation location

Installation and connection Diaphragm pump N 816
20 Translation of original Operating and Installation Instructions, english, KNF 312649-312652 02/23
WARNING
Hazard of injuries during operation

Take
protective measures against touching parts
connected to electrical power (electrical connec-
tion, possibly motor coils).

Take protective measures against touching mov-
ing parts (e.g. fans).

The pump will restart automatically after the
automatic resetting te
mperature limiter has been
triggered.
Hazard of damage to the pump during operation

Take protective measures against foreign ob-
jects which could enter the pump.
Protection against touching and
foreign objects