Pfeiffer DuoLine DUO 20 M User manual

Betriebsanleitung • Operating Instructions
PK 0203 BE/H (0708)
DuoLine™
Rotary Vane Pumps
DUO 20 M
DUO 20 MC

2
Table of contents
Table of contents
1 About this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Proper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Transport and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . 11
5.5 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.6 Operations Monitoring (Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Before switching on the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 Switching off the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.1 Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2 Changing the operating fluid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.3 Cleaning or changing the silencer. . . . . . . . . . . . . . . . . . . . . . . . . . 23
8 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.2 Restarting the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11.1 Spare parts package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
12 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3
About this manual
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the func-
tioning of the designated product and provides the most important information for
safe use of the unit. The description follows applicable EU guidelines. All informa-
tion provided in this operating manual refer to the current state of the product's de-
velopment. The documentation remains valid as long as the customer does not
make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.net.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.net
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating manuals are the result of risk
evaluations and hazard analyses and are oriented on international certification
standards as specified by UL, CSA, ANSI Z-535, Semi-S1, ISO 3864 and DIN 4844.
In this document, the following hazard levels and information are considered:
DUO 20 M/MC Operating instructions
Safety information for vacuum pumps "Safety Guide" PT 0300 BN*
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
DANGER
Immediate danger
Death or very severe injuries occur.
WARNING
Possible danger
Death or injuries may occur.
CAUTION
Possible danger
Medium to slight injuries may occur.
NOTE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.

4
About this manual
Pictograph
definitions
Instructions in the
text
ÎWork instruction: here you have to do something.
Abbreviations used C version: Corrosive gas version
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Exhaust flange
Gas ballast valve
Power connection
Prohibition of an action or activity in connection with a
source of danger, the disregarding of which may result in
serious accidents.
Warning of a displayed source of danger in connection
with operation of the unit or equipment.
Command to perform an action or task associated with a
source of danger, the disregarding of which may result in
serious accidents.
V
G

5
Safety
2 Safety
2.1 Safety precautions
• Do not expose any body parts to the vacuum.
• Observe the safety and accident prevention regulations.
• Check regularly that all safety precautions are being complied with.
• Do not carry out any unauthorised modifications or conversions to the pumps.
• Depending on the operating and ambient conditions, the surface temperature of
the pumps may rise above 70 °C. Use suitable finger guards if necessary.
• When returning the pumps to us please note the instructions in the Service sec-
tion.
The following safety instructions are only valid for the disassembly of the drive
system for a vacuum pump with a magnetic coupling:
• When disassembling the drive system from the pump housing, the strong mag-
netic field may influence the function and operational reliability of electrical and
electronic devices.
• Persons with cardiac pacemakers must keep away from the magnetic coupling.
Danger to life!
• Disassembled magnetic couplings must be kept away from computers, data sto-
rage media and other electronic components.
• Keep the disassembled components of the magnetic coupling separate at all ti-
mes. Danger of crushing!
• Do not allow any magnetised parts into the vicinity of the magnetic coupling.
Danger of injury!
2.2 Proper use
• The vacuum pump may only be used to generate a vacuum.
• Installation, operating and maintenance regulations must be complied with.
• Other accessories than those described in this manual must not be used without
the agreement of Pfeiffer Vacuum.
NOTE
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum
pump must read and observe the safety-related parts of these operating instructions.
ÎAbsolute observe the safety information for vacuum pumps (PT 0300 BN) !
ÎThe operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
NOTE
CE conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
ÎFollowing installation into a plant and before commissioning, the operator must
check the entire system for compliance with the valid EU directives and reassess it
accordingly.

6
Safety
2.3 Improper use
Improper use will cause all claims for liability and guarantees to be forfeited. Im-
proper use is deemed to be all use for purposes deviating from those mentioned
above, especially:
• Pumping of corrosive gases (exception: pumps in C version).
• Pumping of explosive media.
• Operation of the pump in potentially explosive areas.
• Pumping of gases containing impurities such as particles, dusts and condensate;
note the vapour compatibility levels of the pump.
• Pumping of substances that tend to sublime.
• Use of the vacuum pump to generate pressure.
• Pumping of liquids.
• The use of operating fluids not specified by Pfeiffer Vacuum.
• Connection to pumps or units which are not suitable for this purpose according
to their operating instructions.
• Connection to units which have touchable and voltage carrying parts.

7
Transport and Storage
3 Transport and Storage
3.1 Transport
Transport instructions
ÎRemove the locking cap from the vacuum and exhaust flange immediately be-
fore connecting!
– Check the protective strainer, paying attention to the o-ring.
ÎUse only the handle or the crane eye on the top side of the pump to lift the pump.
– Is the pumps weight > 25 kg lift the pump by a crane.
Fig. 1: Transporting the pump
3.2 Storage
ÎCheck that all the openings on the pump are securely closed.
ÎStore the pump in a cool, dry place; preferably at room temperature (approx.
20°C).
– For a longer period of storage, seal the pump in a PE bag with drying agents
enclosed.
– For a period of storage longer than one year, it is recommended to carry out
maintenance and change the operating fluid.

8
Product description
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, al-
ways have the information from the rating plate available and use it:
• Pump model and model number
• Serial number
• Type and amount of operating fluid
• Date of manufacture
Please find the voltage range and motor-related data on the separately attached
motor rating plate.
Fig. 2: Product identification on the rating plate
Scope of delivery • Pump with motor (power cord/power switch --> dependent on the motor type)
• Operating fluid P3 (for standard pump)
• Cone strainer and centering ring with O-ring
• Locking cap for vacuum and exhaust flange
• Operating instructions
Differences between
the pump type
D-35641 Asslar
Mod.: DUO 10
Mod.-Nr.: PK D62 105 D
Ser.- Nr.: 3454440
S : max. 10 m /h
Oil : P3 1.0 l
Mass : 24 kg
n : 1800 1/min
(N )
2
3
max.
Made in Germany 2005/01
Pump type Pump versions
DUO 20 M Standard version of pump
DUO 20 MC
C version of pump; differences from the standard version:
• Operating fluid F4
• Encapsulated can of the magnetic coupling at the pump system
• Vane material changed
• Gas ballast valve with dosable flushing gas connection

9
Product description
4.2 Function
The vacuum pumps of the DuoLine®are dual stage rotary vane pumps and are
used primarily for rough and medium vacuum applications. The pumps are fitted
with a hydraulically controlled vacuum safety valve which, when the pump is at a
stillstand, closes the vacuum chamber vacuum tight and at the same time vents the
pump. The integrated magnetic coupling functions free of contact and friction.
Therefore it is not subjected to any mechanical wear and is completely mainte-
nance free compared to a conventional shaft feedthrough.
Fig. 3: Rotary Vane Pump DUO 20 M
1 Vacuum flange
2 Exhaust flange
15 Main switch
28 Casing
42 Gas ballast valve
80 Base plate
110 Sight glass
198 Operating fluid filler screw
198aOperating fluid drain screw
1198 2 1542
110 8 028198a

10
Installation
5 Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
• Note the load-bearing capacity of the mounting surface.
• Maximum installation altitude 2000 m (above mean sea level)
• Permissible ambient temperature: +12 ... +40°C
• Maximum relative humidity 85%
Fig. 4: Setting up
ÎFill up with operating fluid before operating the first time (see p. 15, chap. 5.5).
– Amount and type according to rating plate
ÎAlways place the pump on a firm, even surface.
– Where stationary installation is involved, anchor the pump on site.
ÎWhen installing the pump in a closed housing, ensure there is sufficient air cir-
culation.
– Sightglass and gas ballast valve must be visible and readily accessible.
– Voltage and frequency information given on the motor rating plate must be
visible.
5.2 Connecting the vacuum side
ÎBefore attaching the piping at the vacuum flange remove locking cap and insert
protective strainer with the respective O-ring.
ÎThe connection between the pump and the recipient should be kept as short as
possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange
connections.
– Separators, filters etc. may be installed upstream to protect the pump (see ac-
cessories). However, please observe the loss of pumping capacity due to the
conductivity of the accessories.
max. 10
°
> 35 mm

11
Installation
5.3 Connecting the exhaust side
ÎChoose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
ÎPiping to the pump must be suspended or supported.
– Forces from the piping system must not be allowed to act on vacuum pumps.
ÎLay piping from the pump, sloping downward so that no condensate can flow
back into the pump; otherwise fit a condensate separator.
– If an air trap is created in the system then a device for draining condensation
water must be provided at the lowest point.
5.4 Connecting to the mains power supply
Depending on the pump type, different motor versions are possible:
• Single phase motor for fixed voltage with a built-in thermal protection switch,
mains switch and connecting cable.
• Single phase motor with switchable broad range voltage motor with a built-in
thermal protection switch and mains connection socket.
• Three phase motor (without switch and mains cable).
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
ÎInstall the line without shut-off valves on the exhaust side.
ÎIf there is danger of a build-up of excess pressure (> 1500 mbar abs.) in the lines,
observe all official accident prevention safety regulations.
ÎIf the exhaust gases are being extracted, the exhaust pressure must be at least
250 mbar greater than the pressure at the intake side.
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to
health and/or can pollute the environment, depending on the particular application.
ÎComply with the applicable regulations when working with toxic substances.
ÎOnly officially approved filter systems may be used to separate out these
substances.
DANGER
Voltage-bearing elements
Danger to life from electric shock.
ÎThe electrical connection can be carried out only by trained and authorised electrici-
ans.
ÎEnsure the system is adequately earthed.
CAUTION
Excess voltage!
Danger of destroying the motor.
ÎPower connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and
frequency values.
ÎTo protect the motor and supply cable in case of malfunction, mains fuse protection
must be implemented.

12
Installation
Single phase broad
range voltage motor
ÎThe mains voltage must be determined on-site each time before the pump is in-
stalled or moved to a different location.
Fig. 5: Connection diagram (terminal box)
Changing the voltage range
ÎDisconnect the pump from the power supply.
ÎSet the rocker switch "S" in the motor terminal box to the desired voltage range.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
ÎSecure the motor so that it cannot be switched on while any work is being performed
on the pump.
ÎIf necessary, dismantle the pump from the installation for inspection.
NOTE
The transmission power of the pump’s magnetic coupling is so great that there
is no overload protection for the motor.
NOTE
Overvoltage!
An incorrect voltage range setting can damage the motor.
ÎDisconnect the pump from the power supply.
ÎOnly change the voltage range when the pump is disconnected from the power
mains.
R Capacitor relay
S Voltage selector switch
T Thermal protection switch
U Mains switch
V Mains connection socket
P
B
T
R
S
U
V
J
T7 T3 T3 T1
T2 T8 T4 T4
CP
CD
2
3
1
B6
A5
A1
LN
B6
B2
B4
B2
A5
A3
A1

13
Installation
Motor protection
ÎTo protect the motor in case of malfunction, carry out fuse protection in accor-
dance with the regional regulations.
– Select a fuse with slow characteristics.
Three-phase motor Inspection of the direction of rotation
With pumps with three-phase motors is it necessary to check the direction of rota-
tion!
ÎRemove the locking cap from the exhaust flange (if existing).
ÎSwitch the pump on briefly (from 2 to 3 sec.).
– The motor and motor fan must turn in a clockwise direction (see the arrow on
the support stand).
ÎIf the direction of rotation is incorrect: Swap two phase contacts at the connec-
ting cable.
ÎFill up the operating fluid.
Motor protection
Pump motors equipped with PTC temperature sensors (3PTC) in the stator wind-
ings can be connected to a PTC resistor tripping device for protection against over-
load.
Tripping devices store the shutdown event and need to be manually switched back
on again via the integrated RESET button or via the external RESET S3. Mains-ON
is detected as an automatic RESET. Other approved motor temperature monitoring
can be used also by the operator.
ÎSet up the connections so that the directional rotation indicated on the pump is
maintained, regardless of the representations in the current flow diagram.
Rocker switch in the terminal box for changing the voltage range
Switch position:
Voltage range: 200 ... 230 V/50 Hz
200 ... 240 V/60 Hz
100 ... 110 V/50 Hz
100 ... 120 V/60 Hz
CAUTION
Operating fluids may leak out!
If the direction of rotation is incorrect, there is a danger that operating fluids may leak
at the vacuum flange.
ÎAlways check the direction of rotation before filling in operating fluid.

14
Installation
Fig. 6: Connection example for a three-phase AC motor with PTC resistor tripping de-
vice
USControl voltage
S1OFF button
S2ON button
S3RESET button, external
K1 Contactor
F1 ... F4 Fuses
T1... T3 PTC resistor sensor
H1 Tripping indicator
M Motor, 3-phase
1)Only for devices with two
relay outputs
2) Only for MSR type
3)Only for order no.:
P 4768 051 FQ
N
L1
M
3
L2
L3
F1 - F3
K1
10 11
AC 220 ... 240 V
Us F4
UVW
S1
S2
k1
K1
H1
S3
2)
A1 A2 T1 T2 Y2Y1 24 21 22 14 1211
2) 2) 1) 1) 1)
T1...T3
3)

15
Installation
5.5 Filling up the operating fluid
The type and amount of operating fluid should be visible on the pump's rating
plate for every rotary vane pump.
The delivery consignment for the standard pump contains suffient operating flu-
id for one filling. Pumps for special applications (e.g. for pumping corrosive gases)
can be operated with other operating fluids. These must be defined in accordance
with Pfeiffer Vacuum specifications before initial assembly and ordered separately.
Permissible operating fluids
• P3 (Standard operating fluid)
• F4 (Operating fluid for corrosive gas versions)
• D1 (for special applications and higher operating temperature)
– Final pressure of measurement, depending on the type of gas: < 5·10-2 mbar
Filling up the
operating fluid
ÎUnscrew operating fluid filler screw 198.
ÎFill up operating fluid.
– Correct filling level during operations: Within the markings at the sightglass
frame.
Fig. 7: Filling up the operating fluid
ÎScrew in operating fluid filler screw 198.
ÎCheck operating fluid level only when the pump is warm and running; close
– vacuum flange and gas ballast valve to do so.
– Check operating fluid daily in non-stop operation, otherwise whenever the
pump is switched on. Refilling is possible when the pump is in final vacuum
operation.
NOTE
Guarantees relating to attainment of final pressures and trouble free functioning
of the pump apply only providing one of the permissible operating fluids is used.
max.
min.
198
WARNING
Toxic vapours!
Danger of poisoning when igniting and heating synthetic operating fluids (e.g. F4/F5)
above 300°C.
ÎObserve the application instructions of the operating fluid manufacturer.
ÎDo not allow operating fluid to make contact with tobacco products; observe safety
precautions when handling chemicals.

16
Installation
5.6 Operations Monitoring (Option)
A pressure switch can be installed on the side of the support to monitor the oil
pressure of the rotary vane pump during operations. By pressure drop and when
the pump is at rest, the contact of the pressure switch opens. The signal can be
used to control external valves.
Fig. 8: Installation location and circuit diagram of pressure switch
Switching voltage: 5 ... 250 Volt (potential free)
Maximum current: 2 Amp.
Protection type: IP 55
1 + 2 closers = pressureless open
1
2

17
Operation
6 Operation
6.1 Before switching on the pump
ÎCheck the operating fluid level in the sightglass.
ÎCompare the voltage and frequency information on the rating plate with the
mains voltage and frequency values.
ÎCheck that the exhaust connection allows free flow (max. permissible pressure
1.5 bar absolute).
– Activate the shut-off valves in such a way that they open before or at the same
time as the pump is started.
ÎProtect the pump sufficiently from taking in contaminants by means of suitable
precautions (e.g. dust filters); if necessary, check operating fluid regularly or re-
place at shorter intervals.
6.2 Switching on the pump
The pump can be switched on in any pressure range.
No special precautions are necessary when pumping dry gases. In order to attain
the lowest possible final pressures, the gas ballast valve should be closed.
ÎSwitch on pump at main switch 15.
6.3 Pumping condensable vapours
Should the process gases contain condensable gases present at high percentages,
the rotary vane pump must be operated with a gas ballast (i.e. with an open gas
ballast valve).
Gas ballast valve,
standard version
To avoid condensation in the pump when pumping condensable vapours, ambient
air or alternatively inertgas is periodically fed into the working chamber at the be-
ginning of the compression phase via the gas ballast valve 42.
The gas ballast valve is closed when turning to the right to position 0 and open
when turning to the left to position 1. Intermediate settings are not possible.
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient
conditions, the surface temperature of the pump may rise above 70 °C.
ÎIn this case, use suitable finger guards.
CAUTION
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibi-
lity (see Technical data) during operation without a gas ballast or in case of insufficient
supply of flushing gas.
ÎOnly pump vapours when the pump is warm and the gas ballast valve is open.
ÎWhen the process has been completed, allow the pump to continue running for
about 30 minutes with the vacuum flange closed and the gas ballast open for ope-
rating fluid regeneration purposes.

18
Operation
Fig. 9: Standard version 42 of gas ballast valve
Gas ballast valve,
corrosive gas version
If the pumping process requires the connection of flushing gas, the C version of the
gas ballast with the flushing gas connection must be used.
Fig. 10: Corrosive gas version of gas ballast valve
ÎConnect flushing gas at the flushing gas connection.
ÎSet flushing gas pressure; maximum pressure 1.5 bar (absolute).
– Select the type and amount of flushing gas depending on the process; consult
Pfeiffer Vacuum if necessary.
0
0
1
1
0
1
0
1
C-Version
CAUTION
Flushing gas pressure higher than allowed endangers the operational reliability
of the pump.
The power input of the pump, the temperature and the ejection of operating fluid will
increase.
ÎObserve the maximum permissible flushing gas pressure.
ÎSet the amount of flushing gas on site.

19
Operation
6.4 Switching off the pump
The pump can be switched off in any pressure range.
Rotary vane pumps have an integrated safety valve on the intake side. If the differ-
ential pressure between the exhaust side and the intake side is ≥250 mbar, then
the valve closes automatically and vents the pump when the pump is switched off.
ÎSwitch the pump off at the mains switch or disconnect from the mains in a secu-
re manner.
Venting the vacuum
chamber
Maintaining the va-
cuum in the chamber
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
ÎVent the vacuum chamber within 30 s, regardless of the chamber size.
ÎFor a longer venting process, use an additional shut-off valve and shut off the intake
line after switching off the pump.
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
ÎBecause the safety valve of the pump is not suitable for longer-term sealing, install
an additional shut-off valve in the intake line.
ÎShut off the intake line immediately after switching off the pump.

20
Maintenance
7 Maintenance
7. 1 P r e c a u t i o n s
ÎAllow the pump to cool to a safe temperature.
ÎOnly dismantle the pump as far as necessary in order to repair defects.
ÎDispose of used operating fluid in compliance with local regulations.
ÎWhen using synthetic operating fluids or working with toxic substances or sub-
stances contaminated with corrosive gases, the relevant instructions governing
their use must be observed.
ÎUse only alcohol or similar agents for cleaning pump parts.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
ÎSecure the motor so that it cannot be switched on while any work is being performed
on the pump.
ÎIf necessary, dismantle the pump from the installation for inspection.
WARNING
Pump parts may be contaminated from pumped media!
Danger of poisoning due to contact with harmful substances.
ÎDecontaminate the pump before carrying out any maintenance work.
ÎIn the event of contamination, take suitable safety precautions to prevent your health
from being harmed by any dangerous substances.