KNF LABOPORT N820.18 CN Wiring diagram

N820.18 CN / N840.18 CN
TRANSLATION OF ORIGINAL
OPERATING INSTRUCTION
ENGLISH
KNF 317428-338560 06/22
LAB
Notice!
Before operating the pump and accessories, read and observe the operat-
ing and installation instructions as well as the safety information!
DIAPHRAGM PUMP
LABOPORT®
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Index
1 Scope of delivery................................................................................... 3
2 About this document ............................................................................. 4
2.1 Using the operating instructions.................................................... 4
2.2 Exclusion of liability....................................................................... 4
2.3 Symbols and markings.................................................................. 5
3 Use........................................................................................................ 7
3.1 Proper use .................................................................................... 7
3.2 Improper use................................................................................. 8
4 Safety .................................................................................................... 9
5 Technical data..................................................................................... 12
Technical data............................................................................. 12
6 Product description and function......................................................... 15
6.1 Gas ballast .................................................................................. 17
7 Transport............................................................................................. 18
General ....................................................................................... 18
8 Commissioning.................................................................................... 20
8.1 Preparing for commissioning ...................................................... 21
8.2 Perform commissioning .............................................................. 22
9 Operation ............................................................................................ 26
9.1 Information on switching the pump on and off ............................ 26
10 Servicing ............................................................................................. 29
10.1 Servicing schedule...................................................................... 30
10.2 Cleaning...................................................................................... 31
10.3 Replace diaphragm, valve plates/seals and O-rings................... 32
11 Troubleshooting .................................................................................. 38
12 Spare parts and accessories............................................................... 42
12.1 Spare parts ................................................................................. 42
12.2 Accessories................................................................................. 42
13 Returns................................................................................................ 43
14 Index ................................................................................................... 44

Diaphragm pump N820.18 CN / N840.18 CN Scope of delivery
Translation of Original Operating Instruction, KNF 317428-338560 06/22 3
1 Scope of delivery
§Key for hose connector (WAF 14)
§Power cable
§Silencer
§Operating instructions
§QuickStart
Unpacking the pump
1. Inspect the pump and the included accessories for trans-
port damage after unpacking.
2. If the packaging is damaged, inform the responsible for-
warding agent so that a damage report can be prepared.
For further information, read Chapter 7 Transport [}18].
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About this document Diaphragm pump N820.18 CN / N840.18 CN
4Translation of Original Operating Instruction, KNF 317428-338560 06/22
2 About this document
2.1 Using the operating instructions
The operating instructions are part of the pump.
àIn the event of uncertainties with regard to the content of
the operating instructions, please contact the manufac-
turer (contact data: see www.knf.com). Please have the
type and serial number of the pump ready.
àRead the operating instructions before you commission
the pump.
àOnly pass on the full and unchanged operating instruc-
tions to any subsequent owner.
àKeep the operating instructions within reach at all times.
Project pumps For customer-specific project pumps (pump models that begin
with "PJ" or "PM"), there may be deviations from the operating
and installation instructions.
àFor project pumps, also observe the agreed specifica-
tions.
2.2 Exclusion of liability
The manufacturer assumes no liability for damages and mal-
functions resulting from failure to observe the operating in-
structions.
The manufacturer assumes no liability for damages and mal-
functions resulting from changes or modifications to the de-
vice and improper handling.
The manufacturer assumes no liability for damages and mal-
functions resulting from impermissible spare parts and acces-
sories.

Diaphragm pump N820.18 CN / N840.18 CN About this document
Translation of Original Operating Instruction, KNF 317428-338560 06/22 5
2.3 Symbols and markings
Warning notice
WARNING
A notice that warns you of danger is lo-
cated here.
Possible consequences of a failure to
observe the warning notice are speci-
fied here. The signal word, e.g., Warn-
ing, indicates the danger level.
àMeasures for avoiding the danger
and its consequences are speci-
fied here.
Danger levels
Signal word Meaning Consequences if
not observed
DANGER warns of immediate
danger
Death or serious in-
jury or serious
damage will result.
WARNING warns of possible
danger
Death, serious in-
jury or serious
damage is possi-
ble.
CAUTION warns of a possibly
dangerous situation
Minor injury or
damage is possi-
ble.
NOTICE Warns of possible
damage
Damage is possi-
ble.
Tab.1: Danger levels
Other notices and symbols
àAn activity to be carried out is specified here (a step).
1. The first step of an activity to be carried out is specified
here.
Other sequentially numbered steps follow.
This symbol indicates important information.
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About this document Diaphragm pump N820.18 CN / N840.18 CN
6Translation of Original Operating Instruction, KNF 317428-338560 06/22
Explanation of pictograms
Pictogram Meaning
General warning symbol
Warning of hot surface
Warning of electrical voltage
Warning of poisonous substances
Warning of hand injuries through crushing
ESD protected area
Observe the operating instructions
General mandatory sign
Unplug mains plug
Use foot protection
Use hand protection
Environmentally conscious disposal
Tab.2: Explanation of pictograms

Diaphragm pump N820.18 CN / N840.18 CN Use
Translation of Original Operating Instruction, KNF 317428-338560 06/22 7
3 Use
3.1 Proper use
The pumps are intended exclusively for transferring gases
and vapors.
Responsibility of the owner
Operating pa-
rameters and
conditions
Only install and operate the pumps in accordance with the op-
erating parameters and conditions described in Chapter 5
Technical data [}12].
Only pumps that are fully assembled and in the condition as
delivered may be operated.
Make sure that the installation location is dry and that the
pump is protected against rain, splash, gushing, and drip wa-
ter as well as from other contaminants.
Check the tightness of the connections between the pipes of
the application and the pump (or the connection of the pump)
at regular intervals. Leaky connections carry the risk of re-
leasing dangerous gases and vapors from the pump system.
Requirements on
the transferred
medium
Before transferring a medium, check whether the medium can
be transferred danger-free in the specific application.
Before using a medium, check the compatibility of the media-
contacting components (see 5 Technical data [}12]) with the
medium.
Only transfer gases that remain stable under the pressures
and temperatures that arise in the pump.
Accessories Laboratory accessories or additional components that are
connected to a pump must be designed for the pneumatic
data of the pump (see 5 Technical data [}12]).
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Use Diaphragm pump N820.18 CN / N840.18 CN
8Translation of Original Operating Instruction, KNF 317428-338560 06/22
3.2 Improper use
The pumps are not allowed to be operated in explosive at-
mospheres.
The pumps are not suitable for transferring:
§Dusts
§Liquids
§Aerosols
§Biological and microbiological substances
§Fuel
§Explosives and flammable materials
§Fibers
§Oxidants
§Food
Pumps that can produce both vacuum as well as overpres-
sure may not be used to simultaneously produce vacuum and
overpressure.
No overpressure may be applied to the suction side of the
pump.

Diaphragm pump N820.18 CN / N840.18 CN Safety
Translation of Original Operating Instruction, KNF 317428-338560 06/22 9
4 Safety
Observe the safety information provided in the chapters
entitled Installation and connection and Operation.
The pumps are produced in accordance with the generally
recognized rules of engineering, as well as the occupational
health, safety and accident prevention regulations. Neverthe-
less, dangers can arise during their use that lead to injuries to
the user or third parties or to damage to the pump or other
property.
Only use the pumps in perfect technical condition, for their in-
tended use, safely and with an awareness of the dangers and
in observation of the operating and installation instructions.
Make certain that the components that are to be connected to
the pumps are designed according to the pneumatic data of
the pumps.
When connecting the pumps to the electrical power, observe
the corresponding safety rules.
Personnel Ensure that only specially trained and instructed personnel or
specialist personnel work on the pumps. This applies in par-
ticular to assembly, connection and maintenance work.
Ensure that the personnel have read and understood the op-
erating and installation instructions, particularly the chapter
entitled Safety.
Working in a
safety conscious
manner
Observe the regulations on accident prevention and safety
during all work on the pumps and during operation.
Avoid contact with the heads and housing parts of the pump,
as it heats up during operation.
Do not expose any body parts to the vacuum.
Ensure that no hazards arise from gas flowing when gas con-
nections are open, from the effects of noise or from hot, corro-
sive, dangerous and environmentally hazardous gases.
Avoid the escape of hazardous, toxic, corrosive, harmful or
environmentally hazardous gases or vapors, e.g. by using
suitable laboratory equipment with fume cupboard and venti-
lation control.
Working with
hazardous me-
dia
When pumping hazardous media, follow the safety regula-
tions that apply for working with these media.
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Safety Diaphragm pump N820.18 CN / N840.18 CN
10 Translation of Original Operating Instruction, KNF 317428-338560 06/22
Working with
combustible me-
dia and explo-
sive atmos-
pheres
Be aware that the pumps are not designed to be explosion-
proof.
Make certain that the temperature of the medium is always
sufficiently below the ignition temperature of the medium so
as to prevent ignition or explosion. This also applies for ab-
normal operating situations.
Note here that the temperature of the medium increases as
the pump compresses the medium.
You should therefore ensure that the temperature of the
medium still remains far enough below the ignition tempera-
ture of the medium, even when it is compressed to the maxi-
mum permissible operating pressure of the pump. The maxi-
mum permissible operating pressure of the pump is stated in
the technical data (5 Technical data [}12]).
Where applicable, also take into account external energy
sources (such as radiated heat sources) that might heat the
medium further.
In case of doubt, contact KNF Customer Service.
Environmental
protection
Store and dispose of the pump, as well as all replacement
parts, in accordance with applicable environmental regula-
tions . Observe national and international regulations. This
applies in particular to parts that are contaminated with toxic
substances.
Dispose of packaging material that is no longer needed in an
environmentally responsible manner. The packaging materi-
als are recyclable.
Dispose of old devices in an environmentally responsible
manner. Dispose of old devices via suitable collection sys-
tems. Old devices contain valuable recyclable materials.
EU/EC direc-
tives/standards
The pumps comply with directives:
§2011/65/EU
§2014/30/EU (EMC)
§2006/42/EC.
The following harmonized standards are satisfied:
§EN 61326-1
§EN 61010-1
§EN 1012-2

Diaphragm pump N820.18 CN / N840.18 CN Safety
Translation of Original Operating Instruction, KNF 317428-338560 06/22 11
§EN ISO 12100
Per IEC 664, the pumps comply with:
§Overvoltage category II
§Pollution degree 2
Customer ser-
vice and repairs
The pumps are maintenance-free. However, KNF recom-
mends periodic inspections to check the pump for obvious
changes in noise and vibration.
Only have repairs to the pumps performed by the responsible
KNF Customer Service department.
Housings with electrically live components may only be
opened by specialist personnel.
Use only genuine spare parts from KNF when performing
servicing work.
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Technical data Diaphragm pump N820.18 CN / N840.18 CN
12 Translation of Original Operating Instruction, KNF 317428-338560 06/22
5 Technical data
Technical data
Pump materials
Assembly Material
Pump head Modified PTFE
Diaphragm PTFE-coated
Valve FFPM
Connection PTFE/FFPM
Hose connector PVDF/FFPM
Gas ballast PTFE/FFPM
Tab.3: Pump materials
Pneumatic data
N820G
Parameter Value
Max. permissible operating
pressure [bar rel*]
0.1
Ultimate vacuum [mbar abs.]
At min. speed:
Gas ballast closed
Gas ballast open
At max. speed:
Gas ballast closed
Gas ballast open
≤ 6
≤17
≤ 8
≤15
Flow rate at atm. pressure [l/
min]**
At min. speed:
At max. speed:
10 ± 10%
20 ± 10%
Tab.4: Pneumatic data N820G
*Bar rel related to 1013 hPa
**Liters in standard state (1013 hPa, 20°C)

Diaphragm pump N820.18 CN / N840.18 CN Technical data
Translation of Original Operating Instruction, KNF 317428-338560 06/22 13
N840G
Parameter Value
Max. permissible operating
pressure [bar rel*]
0.1
Ultimate vacuum [mbar abs.]
At min. speed:
Gas ballast closed
Gas ballast open
At max. speed:
Gas ballast closed
Gas ballast open
≤ 6
≤17
≤ 8
≤15
Flow rate at atm. pressure [l/
min]**
At min. speed:
At max. speed:
18 ± 10%
34 ± 10%
Tab.5: Pneumatic data N840G
*Bar rel related to 1013 hPa
**Liters in standard state (1013 hPa, 20°C)
Pneumatic connections
Parameter Value
Hose connection [mm]
(stepped hose nipple)
ID 8 / 9.5
Tab.6: Pneumatic connections
Electrical data
Parameter Value
N820
Value
N840
Voltage [V] 100 – 240
Frequency [Hz] 50/60
Power consumption [W] 60 100
Max. current consumption [A] 0.66 – 0.35 1.0 – 0.6
Max. permissible mains volt-
age fluctuations
± 10%
Tab.7: Electrical data
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Technical data Diaphragm pump N820.18 CN / N840.18 CN
14 Translation of Original Operating Instruction, KNF 317428-338560 06/22
Weight
Pump type Weight [kg]
N820G 8.8
N840G 11.1
Tab.8: Weight
Other parameters
Parameter Value
Permissible ambient tempera-
ture [°C]
+ 5 to + 40
Permissible media tempera-
ture [°C]
+ 5 to + 40
Highest permissible relative
air humidity of the environ-
ment
80% for temperatures to
31°C, decreasing linearly to
50% at 40°C (non-condens-
ing).
Maximum installation altitude
[m above sea level]
2000
Protection class of pump IP30
Dimensions L x H x W [mm]
N820G 259 x 220 x 163
Dimensions L x H x W [mm]
N840G 289 x 240 x 177
Equipment protection §Overcurrent protection
§Overtemperature protec-
tion (drive)
§Blocking protection (drive)
Tab.9: Other parameters

Diaphragm pump N820.18 CN / N840.18 CN Product description and function
Translation of Original Operating Instruction, KNF 317428-338560 06/22 15
6 Product description and function
Design
1Pneumatic
pump inlet
2Handle
3Rotary/push
knobfor:
§Switching
the pump
on and off
§Setting
the pump
speed
4Pneumatic
pump outlet
5Power switch
6Status display
7Interface*
Fig.1: Diaphragm pump (pump N820G shown)
*Interface:
NOTICE
Injury to property resulting from use of
non-authorized accessories
àOnly ever use accessories that
are authorized by KNF (see the
chapter entitled 12.2 Accessories
[}42]).
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Product description and function Diaphragm pump N820.18 CN / N840.18 CN
16 Translation of Original Operating Instruction, KNF 317428-338560 06/22
Function of a diaphragm pump
1Outlet valve
2Inlet valve
3Transfer
chamber
4Diaphragm
5Eccentric
6Connecting
rod
21
4
3
6
5
Fig.2: Function of a diaphragm pump
Diaphragm pumps transfer, compress (depending on the ver-
sion) and evacuate gases and vapors.
The elastic diaphragm (4) is moved up and down by the ec-
centric (5) and the connecting rod (6). In the downwards
stroke, it aspirates the gas to be transferred via the inlet valve
(2). In the upwards stroke, the diaphragm presses the medium
out of the pump head via the outlet valve (1). The transfer
chamber (3) is separated from the pump drive by the di-
aphragm.

Diaphragm pump N820.18 CN / N840.18 CN Product description and function
Translation of Original Operating Instruction, KNF 317428-338560 06/22 17
6.1 Gas ballast
Fig.3: Operating
button for gas bal-
last
DANGER
Personal injury through poisoning or
explosion and damage to the pump
àWhen the gas ballast valve is open,
make sure that no reactive or ex-
plosive mixtures can form.
àClose the gas ballast valve if nec-
essary.
àIf inert gas is necessary, contact
KNF Service.
If vaporous media are transferred, the formation of con-
densate in the pump heads can be minimized by open-
ing the gas ballast valve.
The final vacuum that can be achieved is worse when
the gas ballast valve is open (see the chapter entitled 5
Technical data [}12]).
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Transport Diaphragm pump N820.18 CN / N840.18 CN
18 Translation of Original Operating Instruction, KNF 317428-338560 06/22
7 Transport
General
CAUTION
Personal injury and/or property dam-
age due to incorrect or improper trans-
port of the pump
In the event of incorrect or improper
transport, the pump can fall down, be
damaged or injure persons.
àUse suitable auxiliary means if nec-
essary (carrying strap, lifting gear,
etc.).
àWhere appropriate, wear suitable
personal protective equipment
(e.g., safety shoes, safety gloves).
CAUTION
Risk of injury from sharp edges on the
packaging
There is a risk of injury from cutting on
the sharp edges when grabbing cor-
ners or when opening the packaging.
àWhere appropriate, wear suitable
personal protective equipment
(e.g., safety shoes, safety
gloves).
àTransport the pump in the original packaging to the instal-
lation location.
àStore the original packaging of the pump (e.g. for later
storage).
àInspect the pump for transport damage after receiving it.
àDocument any transport damage in writing.

Diaphragm pump N820.18 CN / N840.18 CN Transport
Translation of Original Operating Instruction, KNF 317428-338560 06/22 19
àRemove any transport locking devices on the pump prior
to commissioning.
Parameter
Parameter Value
Storage temperature [°C] + 5 to + 40
Permissible humidity (non-
condensing) [%]
30 to 85
Tab.10: Transport parameter and storage parameter
NOTICE
Prior to commissioning, make sure that
the pump has reached the ambient
temperature (5 Technical data [}12]).
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Commissioning Diaphragm pump N820.18 CN / N840.18 CN
20 Translation of Original Operating Instruction, KNF 317428-338560 06/22
8 Commissioning
Only connect the pump in accordance with the operating pa-
rameters and conditions described in Chapter 5 Technical
data [}12].
àObserve the safety instructions (see Chapter 4 Safety
[}9]).
àBefore connecting, store the pump at the installation loca-
tion to allow it to reach the room temperature (no conden-
sate may form).
Cooling air sup-
ply
WARNING
Danger of burning on hot surfaces
Hot surfaces could occur if the pump
overheats.
àWhen installing the pump, make
sure that sufficient cooling air in-
feed and discharge is ensured.
Installation loca-
tion
àMake sure that the installation location is dry and that the
pump is protected against rain, splash, gushing, and drip
water as well as from other contamination.
àSelect a secure location (flat surface) for the pump.
àProtect the pump from dust.
àProtect the pump from vibration, impact and external dam-
age.
àMake sure that it is easy to operate the power switch.