KNF N 87 TTE User manual

KNF 121538-121541 07/16
Translation of original Operating and Installation Instructions, english
Operating and Installation Instructions
Diaphragm Vacuum Pump
and Compressor
Type range:
N 87 TTE
Fig. 1: N 87 TTE
You have selected a high-quality KNF product; the following tips will help you operate it safely, and relia-
bly over a long period of time. Carefully study the Operating and Installation Instructions before using the
pumps and observe at all times the relevant instructions to avoid dangerous situations. The manual was
produced for the serial pumps stated above. With customer-specified projects (pump types starting with
“PJ“ or “PM“) there could be differences in detail. For customer-specified projects please therefore take
into account any agreed technical specifications, as well as these instructions.
List of Contents Page
1. Description, Operating Conditions............................................ 2
2. Safety ....................................................................................... 3
3. Installation ................................................................................ 4
4. Operation.................................................................................. 5
5. Servicing................................................................................... 7
6. Cleaning ................................................................................. 10
7. Trouble Shooting.................................................................... 11
8. Spare parts............................................................................. 13
9. Accessories............................................................................ 13
10. Tables..................................................................................... 14
11. Returns................................................................................... 15
12. Health and safety clearance and decontamination form........ 16
KNF Neuberger GmbH
Alter Weg 3
D-79112 Freiburg
Germany
Phone [phone] / 5909-0
Fax [phone] / 5909-99
E-Mail: [e-mail]
www.knf.de

Description, Operating Conditions Vacuum Pumps N 87 TTE
2 Translation of original Operating Instructions, English, KNF 121538-121541 07/16
1. Description, Operating Conditions
KNF pumps in the N 87 range transfer, evacuate and compress
100% oil-free. In operation they are gas-tight, and maintenance-
free.
1.1. Electrical Equipment
See the type-plate for full electrical data of the motor.
The Protection class of standard versions is IP54.
The motors used are fitted as standard with a thermal switch to
protect against overloading.
1.2. Operating Conditions
Handling air, gases, and vapours at temperatures between
+ 5 °C … + 40 °C.
For maximum permissible operating pressure, ultimate vacuum,
and flow capacity see section 10.
The pumps must not be used in areas where there is a danger of
explosion. You will find suitable pumps for areas where there is a
danger of explosion in our Product Program.
Before pumping a medium, the compatibility of materials of pump
head, diaphragm and valves with the medium must be checked (for
pump materials: see section 10).
KNF pumps in the N 87 range must not be used for liquids. You will
find suitable liquid pumps in our Product Program.
If your potential application lies outside the above limits discuss it
with our technical adviser (see last page for contact telephone
number).
1.3. Ambient Conditions
When the pump is operating the following ambient conditions must
be maintained:
Ambient temperature during operation: between
+ 5 °C … + 40 °C.
The pump must not be used in areas where there is a
danger of explosion.
During operation an adequate supply of air for cooling
must be provided.
1.4. Pump materials
See section 10.

Vacuum Pumps N 87 TTE Safety
Translation of original Operating Instructions, English, KNF 121538-121541 07/16 3
2. Safety
Note that the pumps may only be used for their intended purpose
(see section 1).
The pumps must not be used in areas where there is a danger of
explosion.
For vacuum pumps, the exhaust gases must be disposed safely.
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.
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.
Specific safety instructions for the media being handled must be
observed.
Use only original KNF spare parts.
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
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.
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 (RoHS2).
The following harmonized standards have been used:
DIN EN 50581
DIN EN 55014-1/2
DIN EN 61000-3-2/3
DIN EN 60204-1
EC Directives / Standards

Installation Vacuum Pumps N 87 TTE
4 Translation of original Operating Instructions, English, KNF 121538-121541 07/16
3. Installation
The pumps are OEM models intended for installation in
equipment. When installing them make certain that accident
prevention regulations, and safety instructions, including
those for subsequent operation are observed. The safety
instructions in section 2 must be observed.
The dimensions of the mountings are given in Data Sheet.
Install the pump so that the fan can draw in sufficient cooling air.
Fit the pump at the highest point in the system, so that condensate
cannot collect in the head of the pump - that prolongs working life.
When making the electrical installation the safety regulations
must be observed. In particular make sure that the electricity
supply is isolated before trying to connect the pump.
Compare the supply data with the data on the motor-plate. The
voltage must not vary by more than +10% and -10% from that
shown on the type-plate.
The motor must be connected to earth (ground) wire.
In the electrical installation, arrangements (complying with EN
60335-1) must be made for disconnecting the pump motor from the
electrical supply.
The pump must be installed so that contact with live parts is im-
possible.
We recommend that a fuse is installed in the supply circuit; the
operating current is given in Data Sheet.
Remove the protection plugs from the port threads.
Connect the suction and pressure lines (thread size G 1/8). For
flow direction see marking on the pump head or data sheet.
Arrange the suction and pressure lines so that condensate cannot
run in the pump.
Mechanical
Electrical
Pneumatic
120d 07/2009

Vacuum Pumps N 87 TTE Operation
Translation of original Operating Instructions, English, KNF 121538-121541 07/16 5
4. Operation
The pumps must not be used in areas where there is a danger of
explosion.
Specific safety instructions for the media being handled must be
observed.
If combustible media are used:
Hazard of fires and explosions due to excessively high
media temperature.
Be aware that the pumps are not designed to be explo-
sion-proof.
Make sure the temperature of the medium is always suffi-
ciently 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 suffi-
ciently below the ignition temperature of the medium, even
when it is compressed to the maximum permissible operat-
ing pressure of the pump.
The maximum permissible operating pressure of the pump
is stated in the technical specifications (section 10).
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.
Before pumping a medium, the compatibility of materials of pump
head, diaphragm and valves with the medium must be checked (for
pump materials: see section 10).
The pump must not start against pressure or vacuum. When it is
switched on the pressure in the suction and pressure lines must be
atmospheric. This must be so even when the pump restarts after
the power has been cut off for a short period.
The maximum permissible operating pressure (see section 10)
must not be exceeded.
To prevent the maximum permissible operating pressure being
exceeded, restriction or control of the air or gas flow should only be
carried out in the suction line.
If restriction or control of the air or gas flow is made on the pres-
sure side ensure that the maximum permissible operating pressure
is not exceeded.
When the pump is at a standstill the inlet and exhaust must be at
normal atmospheric pressure.
When the operation of the pump is interrupted by the thermal
switch, the pump will re-start automatically after cooling down.

Operation Vacuum Pumps N 87 TTE
6 Translation of original Operating Instructions, English, KNF 121538-121541 07/16
Take all care necessary to prevent this leading to a dangerous
situation.
Pumps that may be employed as vacuum pump and compressor
must not be used to produce vacuum and pressure at the same
time.
Diaphragm and valve plates/sealings are the only parts subject to
wear. Wear is usually indicated by a drastic reduction in the pneu-
matic performance. When replacing parts proceed as described in
section 5.
Ambient conditions: see section 1.3.

Vacuum Pumps N 87 TTE Servicing
Translation of original Operating Instructions, English, KNF 121538-121541 07/16 7
5. Servicing
Before working on the pump, isolate the power supply secure-
ly, then check that the lines are not live.
Structured diaphragm and valve plates/sealings are the only parts
of the pump subject to wear. They are simple to change.
Always change structured diaphragm, valve plates/sealings at the
same time. If the structured diaphragm and the valve
plates/sealings are not changed at the same time the nominal
performance of the pump is not guaranteed after the service.
If a pump has been used for aggressive or toxic substances or
other types of substances which are hazardous, hazardous to
health, or injurious, the following points must be observed:
1. Clean the pump and its components before servicing.
2. Ensure that the service personnel is not subject to a health
hazard. Apply the safety and protection measures that are
necessary for the medium that has been handled by the pump
(example: the use of protective gloves).
3. Ensure that discarded parts and materials are safely and
correctly disposed of.
Spare part*
Quantity
Structured diaphragm
1
Valve plates/sealings
2
Tab. 1 * According to Spare parts list, section 8
Tools
Phililips screwdriver no. 2
Phililips screwdriver no. 1
Felt-tip marker
Tab. 2
Change the structured diaphragm and valve plates/sealings in the
following sequence:
a) Remove pump head
b) Change structured diaphragm
c) Change valve plates/sealings
d) Refit pump head
Proceed as follows (see figs. 2 and 3):
Parts required
Tools required

Servicing Vacuum Pumps N 87 TTE
8 Translation of original Operating Instructions, English, KNF 121538-121541 07/16
Fig. 2: Pump N 87 TTE
Specification
Pos Description
1 Intermediate plate
2 Valve plate/Sealing
3 does not exist
4 Head plate
5 Screw
6 Screw cap
7 Screw
8 Structured diaphragm
9 Diaphragm support
10 Diaphragm spacer
11 Disk spring
12 Fan
13 Fan cover
14 Housing
15 Top plate
MMark
Fig. 3: Pump head (exploded drawing)

Vacuum Pumps N 87 TTE Servicing
Translation of original Operating Instructions, English, KNF 121538-121541 07/16 9
a) Remove pump head
1. Mark the position of top plate (15), head plate (4), intermediate
plate (1) and housing (14) relative to each other by a drawing
line (M) with a felt tip marker. This helps avoid incorrect as-
sembly later.
2. Undo the 4 head screws (5) and remove top plate (15) and
head plate (4) together with intermediate plate (1) from the
pump housing.
3. Remove fan cover (13) from housing after loosening the four
screws.
b) Change structured diaphragm
1. Turn the fan (12) to bring the structured diaphragm (8) to top
dead centre.
2. Lift the edge of the structured diaphragm (8) and, gripping it on
opposite sides, unscrew it by turning anti-clockwise.
3. Take the diaphragm support (9), diaphragm spacer(s) (10),
and disk spring (11) off the threaded portion of the structured
diaphragm and retain them.
4. Check that all parts are free from dirt and clean them if neces-
sary (see section 6. Cleaning).
5. Put the diaphragm support (9), diaphragm spacer(s) (10), and
disk spring (11), in that order, on the thread of the new struc-
tured diaphragm.
The concave side of the disk spring must be towards the struc-
tured diaphragm.
6. Turn the fan (12) until the connecting rod (connecting part
between motor shaft and structured diaphragm) is at top dead
centre.
7. Screw the new structured diaphragm (8), complete with dia-
phragm support (9), diaphragm spacer(s) (10) and disk spring
(11), into the connecting rod (clockwise) and tighten it by hand.
c) Change valve plates/sealings
1. Undo the screws (7).
2. Separate the head plate (4) from intermediate plate (1).
3. Remove the valve plates/sealings (2) from the intermediate
plate (1).
4. Check that the valve seats in the head plate and intermediate
plate are clean; if scratches, distortion, or corrosion are evident
on these parts they should be replaced.
5. Lay the new valve plates/sealings (2) in the recesses in the
intermediate plate (1). The valve plates/sealings for suction
and pressure sides are identical, as are upper and lower sides
of the valve plates/sealings.

Cleaning Vacuum Pumps N 87 TTE
10 Translation of original Operating Instructions, English, KNF 121538-121541 07/16
6. Place the head plate (4) on the intermediate plate (1), in the
position indicated by the marking (M).
7. Check that the head plate (4) is centred by moving it gently
sideways.
8. Join the head plate (4) and the intermediate plate (1) by tight-
ening the two screws (7) with disk spring and washer until the
screw heads are just seated (that is to say, until the first re-
sistance is felt); than tighten each screw (7) another quarter-
turn.
d) Refit pump head
1. Place the pump head (consisting of intermediate plate (1) with
valve plates/sealings (2) and head plate (4)) on the housing
according to the marking (M).
2. Place the top plate (15) on the head plate (4) according to the
marking (M).
3. Tighten the screws (5) with disk spring gently diagonally.
4. Turn the fan (12) to check that the pump rotates freely.
5. Now tighten screws (5) diagonally, until the disk spring lies on
plainly.
6. Refix the fan cover (13).
If you have any questions about servicing call our technical adviser
(see last page for contact telephone number).
6. Cleaning
When changing valve plates/sealings and structured diaphragm,
inspect all parts for dirt before assembling the pump head, and
clean them if necessary.
If a compressed air line is available, blow the parts out with it.