null  null
Operating and Installation Instructions
Diaphragm Vacuum
Pumps and Compressors
UN 022 ANP
UN 026.1.2 ANP
UN 026.1.2 SNP
UN 022 ATP
UN 026.1.2 ATP
UN 026.1.2 STP
UN 022 AVP
UN 026.1.2 AVP
UN 026.1.2 SVP
UN 022 SNP
UN 026.3 ANP
UN 026.3 SNP
UN 022 STP
UN 026.3 ATP
UN 026.3 STP
UN 022 SVP
UN 026.3 AVP
UN 026.3 SVP
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Contents
KNF Neuberger, Inc
2 Black Forest Rd
Trenton, NJ 08691-1810
Phone: 609-890-8600
Fax:
609-890-8323
www.knfusa.com
Ident#121249-210799
Revision (06/15)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Page
About this document ................................................................. 3
Use ........................................................................................... 4
Safety ....................................................................................... 5
Technical Data.......................................................................... 7
Design and Function .............................................................. 12
Installation and connection ..................................................... 14
Operation ................................................................................ 15
Servicing ................................................................................. 17
Troubleshooting ...................................................................... 24
Spare parts and accessories .................................................. 26
Product Return ....................................................................... 28
Diaphragm Pumps N 022/026.18_P
About this document
1.
About this document
1.1. Using the Operating Instructions
The Operating Instructions are part of the pump.
 Carefully study the Operating Instructions before using a
pump.
 Always keep the operating Operating Instructions handy in the
work area.
 Pass on the Operating Instructions to the next owner.
Project pumps
Customer-specific project pumps (pump models which begin with
“PU” or “MPU”) may differ from the Operating Instructions.
 For project pumps, also observe the agreed upon
specifications.
1.2. Symbols and Markings
Warning
A danger warning is located here.
Possible consequences of a failure to observe the
warning are specified here. The signal word, e.g.
WARNING Warning, indicates the danger level.
 Measures for avoiding the danger and its
consequences are specified here.
Danger levels
Signal word Meaning
DANGER
warns of immediate
danger
WARNING
warns of possible
danger
CAUTION
warns of a possibly
dangerous situation
Consequences if not observed
Death or serious injuries
and/or serious damage are
the consequence.
Death or serious injuries
and/or serious damage are
possible.
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.
3
Use
Diaphragm Pumps N 022/026.18_P
2.
Use
2.1. Proper use
The pumps are exclusively intended for transferring gases and
vapors.
Owner's responsibility
Operating parameters and
conditions
Only install and operate the pumps under the operating parameters
and conditions described in chapter 4, Technical data.
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
Requirements for
transferred medium
Before using a medium, check whether the medium can be transferred danger-free in the specific application case.
Before using a medium, check the compatibility of the materials of
the pump head, diaphragm and valves with the medium.
Only transfer gases which remain stable under the pressures and
temperatures occurring in the pump.
2.2. Improper use
The pump may not be operated in an explosive atmosphere.
The pump is not suitable for transferring dusts.
The pump is not suitable for transferring liquids.
Pumps designed to create either a vacuum or an overpressure
must not be used for these two purposes simultaneously.
An overpressure must not be applied to the suction side of the
pump.
4
Diaphragm Pumps N 022/026.18_P
Safety
3.
Safety
Note the safety precautions in chapters
6. Installation and connection, and 7. Operation.
The pumps are built according to the generally recognized rules of
technology and in accordance with the occupational safety and
accident prevention regulations. Nevertheless, dangers can result
during their use which leads 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 instructions, at all times.
Personnel
Make sure that only trained and instructed personnel or specially
trained personnel work on the pumps. This especially applies to
assembly, connection and servicing work.
Make sure that the personnel has read and understood the
operating instructions, and in particular the "Safety" chapter.
Working in a safetyconscious manner
Observe the accident prevention and safety regulations when
performing any work on the pump and during operation.
Do not expose any part of your body to the vacuum.
Open housing parts with notice sticker (see fig. 1) only after
separating mains plug from power source.
Fig. 1: Notice sticker
Handling dangerous media
When transferring dangerous media, be sure to observe the safety
regulations when handling these media.
Handling flammable media
Be aware that the pump is 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.
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 (see chapter 4).
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
In case of doubt, consult the KNF customer service.
Environmental protection
Store all replacement parts in a protected manner and dispose of
them properly in accordance with the applicable environmental
protection regulations. Observe the respective national and
international regulations. This especially applies to parts
contaminated with toxic substances.
5
Safety
Diaphragm Pumps N 022/026.18_P
Standards
The pumps conform to the safety regulations of the EC Directive
2004/108/EC concerning Electromagnetic Compatibility and the EC
Directive 2006/42/EC concerning Machinery.
The following harmonized standards have been used:
IP20
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 60335-1
IP44
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 60204-1
Tab. 2
The pumps correspond to IEC 664:
Customer service and
repairs

the overvoltage category II

the pollution degree 2.
Only have repairs to the pump carried out by the KNF Customer
Service responsible.
Only authorized personnel should open those parts of the housing
that contain live electrical parts.
Use only genuine parts from KNF for servicing work.
6
Diaphragm Pumps N 022/026.18_P
Technical Data
4.
Technical Data
Pump materials
Pump type
UN022ANP
UN026.1.2ANP
UN026.3ANP
UN022ATP
UN026.1.2ATP
UN026.3ATP
UN022AVP
UN026.1.2AVP
UN026.3AVP
UN022SNP
UN026.1.2SNP
UN026.3SNP
UN022STP
UN026.1.2STP
UN026.3STP
UN022SVP
UN026.1.2SVP
UN026.3SVP
Material*
Pump head
Diaphragm
Valve
Gasket
Aluminium
CR
Stainless steel
CR
Aluminium
PTFE-coated
Stainless steel
FPM
Aluminium
FPM
Stainless steel
FPM
Stainless steel CR
CR
-
Stainless steel PTFE-coated
PTFE
-
Stainless steel FPM
FPM
-
Tab. 3
*According to DIN ISO 1629 und 1043.1
Pneumatic Values
Pump type
UN022ANP
UN022SNP
UN022ATP
UN022STP
UN022AVP
UN022SVP
UN026.1.2ANP
UN026.1.2SNP
UN026.1.2ATP
UN026.1.2STP
UN026.1.2AVP
UN026.1.2SVP
UN026.3ANP
UN026.3SNP
UN026.3ATP
UN026.3STP
UN026.3AVP
UN026.3SVP
Delivery rate* at
Maximal operating
atm. pressure (l/min) pressure (bar g)
Ultimate vacuum
(mbar abs.)
15
4
13
15
2.5
100
39
2
31
35
2
22
-
18
-
19
-
20
25
Tab. 4
*Liters in standard state (1013 bar)
7
Technical Data
Diaphragm Pumps N 022/026.18_P
Electrical Data 100 V versions
Pump Type*
UN022ANP IP 20
UN022ATP IP 20
UN022AVP IP 20
UN022SNP IP 20
UN022STP IP 20
UN022SVP IP 20
UN022ANP IP 44
UN022ATP IP 44
UN022AVP IP 44
UN022SNP IP 44
UN022STP IP 44
UN022SVP IP 44
UN026.1.2ANP IP 20
UN026.1.2ATP IP 20
UN026.1.2AVP IP 20
UN026.1.2SNP IP 20
UN026.1.2STP IP 20
UN026.1.2SVP IP 20
UN026.3ANP IP 20
UN026.3ATP IP 20
UN026.3AVP IP 20
UN026.3SNP IP 20
UN026.3STP IP 20
UN026.3SVP IP 20
Voltage [V]
Frequency
[Hz]
Power P1
[W]
Operating
current [A]
100
50/60
140
2
100
50/60
120
2.6
100
50/60
190
2.6
Tab. 5
8
*see type plate
Diaphragm Pumps N 022/026.18_P
Technical Data
Electrical Data 115 V versions
Pump Type*
UN022ANP IP 20
UN022ATP IP 20
UN022AVP IP 20
UN022SNP IP 20
UN022STP IP 20
UN022SVP IP 20
UN022ANP IP 44
UN022ATP IP 44
UN022AVP IP 44
UN022SNP IP 44
UN022STP IP 44
UN022SVP IP 44
UN026.1.2ANP IP 20
UN026.1.2ATP IP 20
UN026.1.2AVP IP 20
UN026.1.2SNP IP 20
UN026.1.2STP IP 20
UN026.1.2SVP IP 20
UN026.3ANP IP 20
UN026.3ATP IP 20
UN026.3AVP IP 20
UN026.3SNP IP 20
UN026.3STP IP 20
UN026.3SVP IP 20
Voltage [V]
Frequency
[Hz]
Power P1
[W]
Operating
current [A]
115
60
130
1.6
115
60
120
2.1
115
60
180
2
Tab. 6
*see type plate
9
Technical Data
Diaphragm Pumps N 022/026.18_P
Electrical Data 230 V versions
Pump Type*
UN022ANP IP 20
UN022ATP IP 20
UN022AVP IP 20
UN022SNP IP 20
UN022STP IP 20
UN022SVP IP 20
UN022ANP IP 44
UN022ATP IP 44
UN022AVP IP 44
UN022SNP IP 44
UN022STP IP 44
UN022SVP IP 44
UN026.1.2ANP IP 20
UN026.1.2ATP IP 20
UN026.1.2AVP IP 20
UN026.1.2SNP IP 20
UN026.1.2STP IP 20
UN026.1.2SVP IP 20
UN026.3ANP IP 20
UN026.3ATP IP 20
UN026.3AVP IP 20
UN026.3SNP IP 20
UN026.3STP IP 20
UN026.3SVP IP 20
Voltage [V]
Frequency
[Hz]
Power P1
[W]
Operating
current [A]
230
50
100
0.7
230
50
120
1
230
50
170
0.85
Tab. 7
*see type plate
The pumps are fitted as standard with a thermal-switch to protect
against overloading.
10
Diaphragm Pumps N 022/026.18_P
Technical Data
Other parameters
Pneumatic connections
Hose connections N022__P [mm]
ID 6
Hose connections N026._ A_P [mm] ID 9
Hose connections N026._ S_P[mm] ID 10
Ambient and media temperature
Permissible
ambient temperature
+ 5 °C to + 40 °C
Permissible media temperature
+ 5 °C to + 40 °C
Other parameters
Maximum permissible ambient
relative humidity
Max. altitude of site
[m above sea level]
Maximum permitted mains voltage
fluctuations
80 % for temperatures up
to 31°C, decreasing linearly to 50 % at 40°C
2000
+/- 10 %
Weight
UN022A_P IP20 [kg]
UN022A_P IP44 [kg]
UN022S_P IP20 [kg]
UN022S_P IP44 [kg]
UN026._A_P [kg]
UN026._S_P [kg]
4
5.5
5.8
7.2
6.3
9.5
Dimensions
UN022__P IP20
L x H x W [mm]
UN022__P IP44
L x H x W [mm]
UN026.1.2A_P
L x H x W [mm]
UN026.1.2S_P
L x H x W [mm]
UN026.3A_P
L x H x W [mm]
UN026.3S_P
L x H x W [mm]
203 x 194 x 145
260 x 193 x 180
254 x 192 x 185
254 x 192 x 211
243 x 192 x 185
243 x 192 x 211
Tab. 8
11
Design and Function
Diaphragm Pumps N 022/026.18_P
5.
Design and Function
Design UN022A_P
1
2
3
4
Pneumatic pump outlet
Pneumatic pump inlet
On/Off Switch
Handle
Fig. 2: Diaphragm Pump UN022ANP
Design UN026.1.2A_P
1
2
3
4
5
6
Pneumatic pump outlet
Pneumatic pump inlet
On/Off Switch
Pneumatic head connection 1
Handle
Pneumatic head connection 2
Fig. 3: Diaphragm Pump UN026.1.2ANP
12
Diaphragm Pumps N 022/026.18_P
Design and Function
Design UN026.3A_P
1
2
3
4
5
6
Pneumatic pump outlet
Pneumatic pump inlet
On/Off Switch
Handle
Pneumatic head connection
Silencer/filter (accessory)
Fig. 4: Diaphragm pump UN026.3ANP
Function diaphragm pump
1
2
3
4
5
6
7
Outlet valve
Inlet valve
Transfer chamber
Diaphragm
Eccentric
Connecting rod
Pump housing
Fig. 5: Pump head
Diaphragm pumps transfer, compress (depending on pump version) and evacuate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric
(5) and the connecting 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.
13
Installation and connection
Diaphragm Pumps N 022/026.18_P
6.
Installation and connection
Only install the pumps under the operating parameters and
conditions described in chapter 4, Technical data.
Observe the safety precautions (see chapter 3).
6.1. Installation
 Before installation, store the pump at the installation location to
bring it up to room temperature.
Dimensions
Cooling air supply
Installation location
 See chapter 4, Technical data, for the dimensions of pump.
 Install the pump so that the motor fan can intake sufficient
cooling air.
 Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
 Choose a safe location (flat surface) for the pump.
 Protect the pump from dust.
 Protect the pump from vibrations and jolts.
6.2. Connection
Connected components
Pump exhaust
Connection
 Only connect components to the pump which are designed for
the pneumatic data of the pump (see chapter 4).
 If the pump is used as a vacuum pump, safely discharge the
pump exhaust at the pump’s pneumatic outlet.
A marking on the pump head shows the direction of flow.
1. Remove the protective plugs from the pneumatic connectors of
the pump.
2. Mount accessory silencer/filter (where applicable):
If the pump is used as a vacuum pump, mount the silencer at
the pressure side if necessary. If the pump is used as a
compressor (not permitted with series UN026.3) mount the
filter at the suction side if necessary.

Unscrew corresponding hose connector from pump head.

Screw silencer/filter into pump head.
3. Connect suction line and pressure line.
4. Lay the suction and pressure line at a downward angle to
prevent condensate from running into the pump.
5. Insert the power cable’s plug into a properly installed
shockproof socket.
14
Diaphragm Pumps N 022/026.18_P
Operation
7.
Operation
7.1. Preparing for Start-up
Before switching on the pump, observe the following points:
Pump
Operational requirements
 All hoses attached properly

Fan openings not blocked

Specifications of the power supply correspond with
the data on the pump’s type plate.

The pump outlet is not closed or constricted.
Tab. 9
7.2. Starting
 Only operate the pump under the operating parameters and
conditions described in chapter 4, Technical data.
 Make sure the pump is used properly (see chapter 2.1).
 Make sure the pump is not used improperly (see chapter 2.2).
 Observe the safety precautions (see chapter 3).
Hazard of the pump head bursting due to excessive
pressure increase
 Do not exceed max. permissible operating
pressure (see chapter 4).
WARNING
 Monitor pressure during operation.
 If the pressure exceeds the maximum
permissible operating pressure, immediately
shut down pump and eliminate fault (see chapter
9. Troubleshooting).
 Only throttle or regulate the air or gas quantity in
the suction line to prevent the maximum
permissible operating pressure from being
exceeded.
 If the air or gas quantity in the pressure line is
throttled or regulated, make sure that the
maximum permissible operating pressure of the
pump is not exceeded.
Excessive pressure (with all of the related hazards) can be
prevented by placing a bypass line with a pressure-relief valve
between the pressure and suction side of the pump. For further
information, contact your KNF technical adviser.
Pump standstill
 With the pump at a standstill, open pressure and suction lines
to normal atmospheric pressure.
15
Operation
Diaphragm Pumps N 022/026.18_P
Automatic starting can cause personal injury and
pump damage
When the thermal switch interrupts the operation of
WARNING the pump, the pump will restart automatically after
cooling down.
 After triggering of the thermal protection or in the
event of power failure, remove the pump’s mains
plug from the socket so that the pump cannot
start uncontrollably.
 Attempt work on the pump only if the pump is
separated from mains power.
7.3. Switching pump on and off
Switching pump on
The pump may not start up against pressure or vacuum during
switch-on. This also applies in operation following a brief power
failure. If a pump starts against pressure, it may block. This
activates the thermal switch, and the pump switches off.
 Make sure that no pressure is present in the lines during
switch-on.
 Switch on pump with mains switch (see fig. 2, 3 or 4, position
3).
Switching off the pump/removing from operation
 When transferring aggressive media, flush the pump prior to
switch-off to increase the service life of the diaphragm (see
chapter 8.2.1).
 Switch off pump with mains switch (see fig. 2, 3 or 4, position
3).
 Open pressure and suction lines to normal atmospheric
pressure.
16
Diaphragm Pumps N 022/026.18_P
Servicing
8.
Servicing
8.1. Servicing Schedule
Component
Pump
Servicing interval
Regular inspection for external
damage or leaks
Diaphragm, reed valves
Replace at the latest, when pump
(valve plate)
output decreases
Silencer/filter (accessory) Change if it is dirty
Tab. 10
8.2. Cleaning
When cleaning, make sure that no liquids enter the inside of
the housing.
8.2.1. Flushing Pump
 Before switching off the pump, flush it with air (if neccesary for
safety reasons: with an inert gas) for about five minutes under
atmospheric conditions (ambient pressure).
8.2.2. Cleaning Pump
 Only use solvents for cleaning if the head materials cannot be
attacked (check the resistance of the material!).
 If compressed air is available, blow out the components.
17
Servicing
Diaphragm Pumps N 022/026.18_P
8.3. Changing Diaphragm and Valves
8.3.1. Pumps with aluminium head
Conditions
Spare parts
UN022ANP
UN026.1.2ANP
UN026.3ANP
UN022ATP
UN026.1.2ATP
UN026.3ATP
UN022AVP
UN026.1.2AVP
UN026.3AVP

Pump is switched off and mains plug is removed from the
socket

Pump is clean and free of hazardous materials

Tubes removed from pump’s pneumatic inlet and outlet
Spare part*
Position**
Diaphragm
Countersunk
screw
Reed valve
Gasket
(F)
(D)
Quantity per
pump head
1
1
(M,P)
(V)
2
1
Tab. 11
Tools
Quantity
1
1
1
1
1
1
*According to Spare parts list, chapter 10
**According to Fig. 6.
Tools/Material
Allen key 3 mm
Allen key 4 mm
Screwdriver blade width 6.5
Screwdriver blade width 4.0
Socket wrench 5.5 mm
Pencil
Tab. 12
Information on procedure
With multi-head pumps, parts of the individual pump heads can be
confused.
 Replace the diaphragm, reed valves, and gasket of the
individual pump heads consecutively.
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
WARNING burns or poisoning are possible.
 Wear protective clothing if necessary, e.g.
protective gloves.
 Flush pump before replacing the diaphragm and
redd valves (see chapter 8.2.1).
18
Diaphragm Pumps N 022/026.18_P
Servicing
Fig. 6: Pump parts for versions with aluminium head
1. For pumps UN026.1.2A_P:
On the pneumatic connection between the pump heads on the
suction side, pull the hose off one pump head.
On the pneumatic connection on the pressure side, loosen the
hose clip on one pump head and pull the hose off.
2. For pumps UN026.3A_P:
At one pump head pull off the tube of pneumatic connection.
3. Mark the position of the diaphragm head C in relation of the
housing A with a pencil.
4. Loosen the four allen screws B and remove the diaphragm
head C.
5. Unscrew the countersunk screw D, remove the retainer plate E
and the diaphragm F.
6. Loosen the four screws G and remove the cover plate H.
7. Turn the counterweight I so that the connection rod K is in the
mid-position; fit the new diaphragm F.
8. Place the retainer plate E on the diaphragm F and tighten the
new countersunk screw D (torque: 5.0 Nm).
19
Servicing
Diaphragm Pumps N 022/026.18_P
The self-locking screw D can only be used once.
9. Change reed valves M and P:

Loosen the allen screws S, remove the cover plate T and
the gasket V.

Use a socket wrench to unscrew the nut U, then remove
the valve fastening screw W and the reed valves P and M.

Fasten the new reed valves P and M with screw W and fit
the washer X under the nut U.

Replace the cover plate T with a new gasket V and tighten
the allen screws S.
10. Place the diaphragm head C according to the marks made
previously and tighten the screws B uniformly and diagonally.
Tightening torque:
UN022ANP:
6.5 Nm
UN022ATP:
5.5 Nm
UN022AVP:
6.5 Nm
UN026._ANP:
6.5 Nm
UN026._ATP:
5.5 Nm
UN026._AVP:
6.5 Nm
11. Turn the counterweight I to check that the pump run freely.
12. For two-headed pumps:
Carry out steps 3 to 11 for the second pump head.
13. Replace the cover plate H and secure it with the four screws G.
14. For two-headed pumps:
Reattach the tube (pumps UN026.1.2A_P: the tubes) of
pneumatic head connection onto the hose connector.
For UN026.1.2A_P pump models: Retighten the hose clip on
the pneumatic head connection on the pressure side.
20
Diaphragm Pumps N 022/026.18_P
Servicing
8.3.2. Pumps with stainless steel head
Conditions
Spare parts
UN022SNP
UN026.1.2SNP
UN026.3SNP
UN022STP
UN026.1.2STP
UN026.3STP
UN022SVP
UN026.1.2SVP
UN026.3SVP

Motor disconnected from mains and de-energized

Pump is clean and free of hazardous materials
Spare part*
Position**
Diaphragm
Countersunk
screw
Valve plate
(F)
(D)
Quantity per
pump head
1
1
(Z)
1
Tab. 13
Tools
Quantity
1
1
1
*According to Spare parts list, chapter 10
**According to Fig. 7
Tools/Material
Allen key 4 mm
Screwdriver blade width 6.5
Pencil
Tab. 14
Information on procedure
With multi-head pumps, parts of the individual pump heads can be
confused.
 Replace the diaphragm and valve plate of the individual pump
heads consecutively.
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
WARNING burns or poisoning are possible.
 Wear protective clothing if necessary, e.g.
protective gloves.
 Flush pump before replacing the diaphragm and
the valve plate (see chapter 8.2.1).
21
Servicing
Diaphragm Pumps N 022/026.18_P
Fig. 7: Pump parts for versions with stainless steel head
1. For pumps UN026.1.2S_P:
On the pneumatic connection between the pump heads on the
suction side, pull the hose off one pump head.
On the pneumatic connection on the pressure side, loosen the
hose clip on one pump head and pull the hose off.
2. For pumps UN026.3S_P:
Pull the pneumatic head connection hose off one pump head.
3. Mark the position of the head plate W and intermediate plate X
in relation of the housing A with a pencil.
4. Loosen the four allen screws Y and remove the head plate W,
valve plate Z and intermediate plate X.
5. Unscrew the countersunk screw D, remove the retainer plate E
and the diaphragm F.
6. Loosen the four screws G and remove the cover plate H.
7. Turn the counterweight I so that the connection rod K is in the
mid-position; fit the new diaphragm F.
8. Place the retainer plate E on the diaphragm F and carefully but
firmly tighten the new countersunk screw D (torque: 5.0 Nm).
The self-locking screw D can only be used once.
22
Diaphragm Pumps N 022/026.18_P
Servicing
9. Place the intermediate plate X on the top of the diaphragm F
so that it corresponds to the marks on the housing.
10. Place the new valve plate Z on the intermediate plate X (for
orientation: see fig. 7).
11. Place the head plate head W according to the marks made
previously and tighten the screws Y uniformly and diagonally
Tightening torque:
UN022SNP:
UN022STP:
UN022SVP:
UN026._SNP:
UN026._STP:
UN026._SVP:
6.5 Nm
5.5 Nm
6.5 Nm
6.5 Nm
5.5 Nm
6.5 Nm
12. Turn the counterweight I to check that the pump run freely.
13. For two-headed pumps:
Carry out steps 3 to 12 for the second pump head.
14. Replace the cover plate H and secure it with the four screws G.
15. For two-headed pumps:
Pull the pneumatic head connection hose (or hoses in the case
of UN026.1.2S_P pump models) back onto the hose
connector.
For UN026.1.2S_P pump models: Retighten the hose clip on
the pneumatic head connection on the pressure side.
23
Troubleshooting
Diaphragm Pumps N 022/026.18_P
9.
Troubleshooting
Extreme danger from electrical shock!
 Disconnect the pump power supply before working
on the pump.
DANGER  Make sure the pump is de-energized and secure.
 Check the pump (see Tab. 15 to 18).
Pump does not transfer
Cause
No voltage in the power source
Thermal switch has operated
following to over-heating.
Connections or lines blocked.
External valve is closed or filter
is clogged.
Condensate has collected in
pump head.
Diaphragm or reed valves
(valve plate) are worn.
Fault remedy
 Check room fuse and switch on if necessary.






Disconnect pump from mains.
Allow pump to cool.
Trace cause of over-heating and eliminate it.
Check connections and lines.
Remove blockage.
Check external valves and filters.
 Detach the condensate source from the pump.
 Flush pump (see chapter 8.2.1).
 Replace diaphragm and reed valves (valve plate), (see
chapter 8.3).
Tab. 15
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
Condensate has collected in
 Detach the condensate source from the pump.
pump head.
 Flush pump (see chapter 8.2.1).
There is gauge pressure on
 Change the pressure conditions.
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
suction side.
Pneumatic lines or connection
 Disconnect pump from system to determine output values.
parts have an insufficient cross  Eliminate throttling (e.g. valve) if necessary.
section.
 Use lines or connection parts with larger cross section if
necessary.
Leaks occur on connections,
 Check that tubes sit correctly on hose nozzles.
lines or pump head.
 Replace leaky tubes.
 Eliminate leaks.
Connections or lines completely  Check connections and lines.
or partially clogged.
 Remove the clogging parts and particles.
 Clean head components.
Head parts are soiled.
Diaphragm or reed valves
(valve plate) are worn.
24
 Replace diaphragm and reed valves (valve plate),
(see chapter 8.3).
Diaphragm Pumps N 022/026.18_P
Troubleshooting
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
After diaphragm and reed
 Check head connection and hose connections for leaks.
valves (valve plate) have been
 Pumps UN22A_P and UN026.1.2A_P:
replaced
Possibly carefully tighten the screws (B) and (S) (see fig. 6)
crosswise.
 Pumps UN22S_P and UN026.1.2S_P:
Possibly carefully tighten the screws (Y) (see fig. 7)
crosswise.
Tab. 16
Pump is switched on, but does not run, the on/off-switch on the pump is not lit
Cause
Pump is not connected with the
power source.
No voltage in the power source
Fault remedy
 Connect pump to mains power.
 Check room fuse and switch on if necessary.
Tab. 17
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause
The thermal switch has opened
due to overheating
Cause
 Remove pump´s mains plug from the socket.
 Allow pump to cool.
 Trace cause of over-heating and elimate it.
Tab. 18
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see first page for the address).
1. Flush the pump to free the pump head of dangerous or aggressive gases (see chapter 8.2.1).
2. Clean the pump (see chapter 8.2.2).
3. Send the pump to KNF with a filled out decontamination
declaration (see chapter 11) and specification of the medium
transferred.
25
Spare parts and accessories
Diaphragm Pumps N 022/026.18_P
10. Spare parts and accessories
Spare parts
UN022ANP
UN026.1.2ANP
Spare part
Diaphragm
Countersunk screw
Reed valve
Gasket
Position*
(F)
(D)
(M, P)
(V)
Tab. 19
UN022ATP
UN026.1.2ATP
Position*
(F)
(D)
(M, P)
(V)
Tab. 20
UN026.1.2AVP
Position*
(F)
(D)
(M, P)
(V)
Tab. 21
Order No.
001363
200543
001288
021107
UN026.3AVP
Order No.
001391
200543
001288
008323
*According to Fig. 6
UN026.1.2SNP
Spare part
Diaphragm
Countersunk screw
Valve plate
Position*
(F)
(D)
(Z)
Tab. 22
UN022STP
UN026.3ATP
*According to Fig. 6
Spare part
Diaphragm
Countersunk screw
Reed valve
Gasket
UN022SNP
Order No.
001257
200543
001288
001273
*According to Fig. 6
Spare part
Diaphragm
Countersunk screw
Reed valve
Gasket
UN022AVP
UN026.3ANP
UN026.3SNP
Order No.
001257
200543
001272
*According to Fig. 7
UN026.1.2STP
Spare part
Diaphragm
Countersunk screw
Valve plate
Position*
(F)
(D)
(Z)
UN026.3STP
Order No.
001363
200543
001364
Tab. 23
UN022SVP
*According to Fig.7
UN026 1.2SVP
Spare part
Diaphragm
Countersunk screw
Valve plate
Tab. 24
26
Position*
(F)
(D)
(Z)
UN026.3SVP
Order No.
001391
200543
001392
*According to Fig. 7
Diaphragm Pumps N 022/026.18_P
Spare parts and accessories
Accessories
Accessory
Silencer/filter (G ⅛)
Silencer/filter (G ¼)
for pump type
type range UN022
type range UN026
Order No.
000346
000352
Tab. 25
27
Product Return
Diaphragm Pumps N 022/026.18_P
11. Product Return
 KNF provides warranty and non-warranty repair services for all
products.
 A Return Material Authorization (RMA) number is required for
all product returns.
KNF Neuberger, Inc
2 Black Forest Rd
Trenton, NJ 08691-1810
Phone 609-890-8600
Fax
609-890-8323
www.knfusa.com
28
 To receive an RMA number, submit a completed
Decontamination Declaration form to [email protected]
 The Decontamination Declaration form can obtained from our
website or by contacting KNF Technical Services.

www.knf.com/productreturns

Phone: 609-890-8600
 Product return instructions will be provided when the RMA is
issued.
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