Becker VT 3.6 Operating instructions

1 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
TRANSLATION OF THE OPERATING INSTRUCTIONS
VT 3.6
VT 4.2/4/8
VX 3.6
ROTARY VANE-
VACUUM PUMP
dry-running
MAKE IT BECKER.

2 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
Important notes for the user of the operating instructions
We reserve the right to make technical changes and additions to the operating instructions.
No liability is accepted for the content, in particular for damage caused by existing, non-existing or incorrect
information.
Passing on this operating manual is not permitted unless expressly authorised.
Operating instructions valid for:
General designation
Rotary vane-Vakuumpumpe, hereinafter described as "pump".
Product type
dry-running
Model
VT 4.2, VT 4.4, VT 4.8, VT 3.6 and VX 3.6
Manufacturer
Gebr. Becker GmbH
Hölker Feld 29-31
42279 Wuppertal
CONTENT
1TO THE OPERATING INSTRUCTIONS 4
1.1 GENERAL 4
1.2 STRUCTURE OF THE SAFETY INSTRUCTIONS 4
1.3 SAFETY SYMBOLS 4
1.4 ADDITIONAL DOCUMENTATION 5
1.5 WARRANTY AND LIABILITY 5
1.6 MODIFICATIONS AND CONVERSIONS 5
2BASIC SAFETY INSTRUCTIONS 6
2.1 PROVISION 6
2.2 OBLIGATIONS OF THE OPERATOR 6
2.3 OBLIGATIONS OF THE STAFF 6
2.4 STAFF QUALIFICATION 7
2.5 INTENDED USE 7
2.6 INADMISSIBLE USE 7
2.7 PROTECTIVE MEASURES FOR USERS 7
2.8 INFORMATION ON RESIDUAL RISKS 8
2.9 SAFETY INSTRUCTIONS 8
2.10 BEHAVIOUR IN CASE OF DANGER AND ACCIDENTS 9
2.11 REQUIREMENT FOR STABILITY 9
2.12 OCCUPATIONAL SAFETY AND HEALTH 10
2.13 AIRBORNE SOUND EMISSIONS 10
2.14 ERGONOMICS 10
3OPERATING CONDITIONS 11
4PUMP DESCRIPTION 12
4.1 GENERAL DESCRIPTION OF THE PUMP 12
4.2 SIZES 12
4.3 VARIANTS 12
4.4 COMPONENT ILLUSTRATION 14
4.5 MOTORS 16
4.6 SAFETY AND PROTECTIVE DEVICES 16
4.7 TESTING THE SAFETY AND PROTECTIVE DEVICES 16
5TRANSPORT 17

3 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
6INSTALLATION AND COMMISSIONING 18
6.1 GENERAL REQUIREMENTS 18
6.2 PREPARATORY ACTIVITIES 19
6.2.1 CONNECTING THE MEDIA LINE 19
6.2.2 ADJUST VALVE 19
6.3 ELECTRICAL INSTALLATION 19
6.3.1 ELECTRICAL CONNECTION (VT 3.6, VX 3.6 AND VT 4.2-4.8 STANDARD) 21
6.3.2 ELECTRICAL CONNECTION (VT 4.4-4.8 DC) 21
6.4 SWITCH ON PUMP 22
6.5 NORMAL OPERATION 22
6.6 SWITCH OFF PUMP 22
6.7 RECOMMISSIONING 22
7TROUBLESHOOTING / TROUBLESHOOTING 24
7.1 FAULT TABLES 24
8MAINTENANCE, SERVICING AND DISMANTLING 27
8.1 MAINTENANCE AND SERVICING 27
8.2 PREPARATION 27
8.3 MAINTENANCE INTERVALS 28
8.4 MAINTENANCE ACTIVITIES 29
8.5 MEDIA LINES 30
8.6 CONDITIONS FOR RECONNECTION 30
8.7 SPARE AND WEAR PARTS 31
8.8 TEMPORARY DECOMMISSIONING 31
8.9 CLEANING 31
8.10 DISMANTLING AND DECOMMISSIONING 31
8.11 STORAGE 32
8.12 DISPOSAL 32
9PRODUCT DATA SHEET 33
9.1 PRODUCT OVERVIEW 33
9.2 OPERATING PARAMETERS 33
9.3 TECHNICAL DATA 34

4 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
1TO THE OPERATING INSTRUCTIONS
1.1 GENERAL
These operating instructions are an essential part of the pump and contain the necessary information and important
notes to operate the pump safely and properly. Observance of these instructions will help:
•Avoiding dangers,
•Reduce repair costs and downtime, as well as
•increase the reliability and service life of the product.
It is the responsibility of the operator to ensure the availability of this document. This applies in particular in the event
of loss of the document.
All persons who carry out activities on the pump must have read and understood the operating manual and these
operating instructions.
NOTE
Pay special attention to the chapter 2.
1.2 STRUCTURE OF THE SAFETY INSTRUCTIONS
Safety instructions are identified by a pictogram and a signal word. The following signal words are used to indicate
dangers, prohibitions and important information:
DANGER
This signal word indicates an imminent danger that will result in serious injury or even death.
WARNING
This signal word indicates a possibly imminent danger that can result in serious injuries or even death.
CAUTION
This signal word indicates a possible imminent danger that may result in minor or severe injuries.
ATTENTION
This signal word indicates a possible imminent danger that may result in damage to property.
NOTE
This symbol indicates tips, recommendations and further information.
1.3 SAFETY SYMBOLS
The following symbols are used in these operating instructions.
Warning sign:
General warning sign
Fire hazard
Risk of tripping
Warning against hand injuries
Warning against automatic start-up
Warning of electrical voltage
Warning against hot surfaces
Commandment sign:
Attention
Use foot protection
Use hearing protection

5 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
Use hand protection
Note:
General information
1.4 ADDITIONAL DOCUMENTATION
In addition to these operating instructions, the following documents and notes must be observed:
•Safety symbols according to chapter 1.3 on the pump as well as on hazardous material containers
•Regulations on accident prevention, occupational safety and environmental protection
•Operating instructions and documentation for components, assemblies and aids provided by third-party
manufacturers
•Spare parts lists
•Data sheets
1.5 WARRANTY AND LIABILITY
Warranty and liability claims in the event of personal injury or damage to property are invalid in the event of
•Failure to observe the instructions for transport and assembly;
•improper use (misuse) or improper operation;
•Failure to observe the operating instructions and the instructions contained therein;
•improper or non-executed maintenance and servicing work;
•faulty installation, commissioning, maintenance, servicing and cleaning;
•Use of incorrect operating materials, lubricants or spare parts;
•defective, incorrectly installed or dismantled protective devices;
•inadequate monitoring of components subject to wear;
•Use of externally procured equipment that has not been approved by the manufacturer;
•improper disassembly;
1.6 MODIFICATIONS AND CONVERSIONS
Modifications or conversions are prohibited without the written consent of the manufacturer and are therefore
excluded.
NOTE
Description of the safety instructions in chapter 2.9

6 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
2BASIC SAFETY INSTRUCTIONS
These operating instructions serve as a basis for the safe use and operation of the pump. The operating instructions,
in particular the safety instructions and the rules and regulations applicable to the place of use, must be observed by
all persons working on or with the pump.
Furthermore, the generally applicable legal and other rules and regulations for accident prevention (e.g. personal
protective equipment) and environmental protection for the place of work must be followed.
NOTE
Some activities on the vacuum pump require compliance with special safety regulations. These safety
instructions can be found in the respective chapters of these operating instructions.
NOTE
The operating instructions must always be kept at the place of use and be freely accessible to all persons
with tasks on the vacuum pump.
The instructions of the occupational safety specialist and the instructions for action from the briefings must
be followed without fail.
The pump is only intended for the intended use described in the chapter 2.5.
Use of the pump outside of its intended use is prohibited.
All work on the pump may only be carried out by qualified and trained personnel (see chapter 2.4).
For all activities on the pump, the safety instructions given in chapter 2.9 must be observed.
2.1 PROVISION
The pump is a machine in the sense of the Machinery Directive 2006/42/EC Art 2a. The pump conforms to the health
and safety requirements of the Machinery Directive 2006/42/EC.
The pump may only be used after the operator has determined that the use of the pump is installed according to the
state of the art.
This is fulfilled if, among other things, the operating conditions listed in these operating instructions have been fully
implemented in accordance with Directive 2006/42/EC Annex 1 Para. 1.7.4.2.i.
2.2 OBLIGATIONS OF THE OPERATOR
The operator undertakes to only allow persons to work on the pump who are
•are familiar with the basic regulations of occupational safety and accident prevention;
•were instructed for the activities at the pump;
•have read and understood these operating instructions before carrying out any work on the pump;
•have reached the legal minimum age;
•are fit for health;
•are rested and not under the influence of drugs or medication;
•reliably perform the assigned work.
In addition, the operator must train the staff at regular intervals and inform them about the dangers.
The personnel of the operating company must be permanently committed to safe working practices and informed
about the dangers and risks of the pump. This applies in particular to the safety instructions.
The operator must provide the personnel with the necessary protective equipment.
2.3 OBLIGATIONS OF THE STAFF
All persons entrusted with work on the pump undertake, before starting work, to
•observe the basic regulations on occupational safety and accident prevention and
•to read and observe these operating instructions
NOTE
Only persons who have read and understood these operating instructions may carry out activities on and
with the pump!

7 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
2.4 STAFF QUALIFICATION
Certain activities require a specific qualification to be demonstrated by the personnel carrying them out. The
following table summarises these qualifications:
Activity
People
Instructed persons with specialist
training
Instructed operating personnel
Commissioning
x
Operation
x
Maintenance & Servicing
x
Disassembly
x
Symbol "x" approved personnel
Table 2.4: Staff qualification
2.5 INTENDED USE
The operational safety of the pump is only guaranteed if it is used as intended. Intended use also includes observing
these operating instructions for this product and any components, as well as carrying out all maintenance and service
work.
The pump may only be used as intended in accordance with the machine description and the technical data.
The intended use is summarised below:
•The pump evacuates air to a vacuum according to chapter 9.2
•The transport of any other gases, in particular hazardous substances, is not permitted and prohibited.
•The permissible technical parameters must be observed.
•The pump must not be operated in potentially explosive atmospheres.
•The pump must be protected from the weather.
•For any operation outside the technical parameters specified in the product data sheet, the manufacturer must
be consulted.
ATTENTION
Only use the pump for its intended purpose and only use it if it is in perfect working order! This is the only
way to ensure the operational safety of the pump!
2.6 INADMISSIBLE USE
•evacuating hazardous materials, especially flammable, explosive or toxic gases
•use in potentially explosive atmospheres (explosive gas/vapour/mist/air mixtures or dust/air mixtures or hybrid
mixtures of air and flammable substances).
•the use of the pump in non-commercial applications
•the operation of the pump in an incompletely assembled state
2.7 PROTECTIVE MEASURES FOR USERS
When working on the pump, personal protective equipment must be worn to minimise health hazards.
The necessary protective equipment for the respective work must be worn at all times during work.
Personal protective equipment instructions posted in the work area must be followed.
WARNING
Risk of injury to hands due to crushing, cutting and high temperatures
During all work on the pump, hand protection must be worn in accordance with the glove schedule.
WARNING
Risk of injury to feet from crushing and falling objects
Foot protection must be worn during all activities at the pump.

8 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
WARNING
Hearing damage due to high volume
Hearing protection must be worn during activities that must be carried out while the pump is running.
Hand protection must be provided by the operator and must be suitable for the activities to be carried out and
comply with the applicable standards (e.g. EN 388:2019-03).
Foot protection must be provided by the operator and must be suitable for the activities to be performed and comply
with the applicable standards (e.g. DIN EN ISO 20345:2020-06).
Hearing protection must be provided by the operator and must be suitable for the noise levels generated and comply
with the applicable standards (e.g. DIN EN 3527:2003-04).
2.8 INFORMATION ON RESIDUAL RISKS
The pump is built according to the current state of the art and the recognised safety regulations. When using the
pump, health hazards for persons directly working with the pump and third parties cannot be excluded.
2.9 SAFETY INSTRUCTIONS
The hazards and risks in the respective phases of the pump's life are described below. The following hazard warnings
must be observed.
DANGER
Danger to life due to electric shock / Personnel qualification
Work and tasks on the electrical system may only be carried out by qualified electricians who can prove that
they have successfully completed a recognised training course in the relevant specialist field and have been
instructed in the technical features of the pump.
The performance of electrical work, including the simplest auxiliary activities, is prohibited without exception
for persons who do not fulfil the above conditions.
To perform tasks and activities on the pump's electrical system, work must be carried out in accordance
with the five safety rules according to DIN VDE 0105.
DANGER
Danger to life due to electric shock / Measures in case of damage to the electrical installation
Damage to the electrical installation and contact with live parts can be life-threatening.
The following measures are therefore mandatory:
•In the event of damage to the electrical installation, switch off the pump immediately and notify the
responsible office.
•A repair by a qualified electrician must be arranged.
DANGER
Danger to life due to unexpected start-up / countermeasures
The following steps are mandatory when preparing for maintenance and servicing activities:
1. Switch off the pump and all attached assemblies.
2. Disconnect the pump from the supply voltage and proceed according to the five safety rules
(VDE105).
3. Disconnect the pump from the air supply.
DANGER
Fire and danger to life due to insufficient distances to neighbouring parts
If the pump is enclosed, minimum distances from the product must be maintained to prevent potential fires.
Information on minimum distances can be found in the chapter 6.
DANGER
Danger to life due to arcing and creepage path formation when disconnecting plug connections
Always switch off the power supply before disconnecting any plug-in connections.

9 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
DANGER
Danger to life due to defective, dismantled and manipulated protective devices
The pump may only be operated if all safety and protective devices are fully present and functional!
Faulty safety and protective devices can lead to dangerous situations!
For this reason:
1. Switch off the pump immediately,
2. secure against restarting and
3. disconnect from air supply and electric current!
WARNING
Risk of injury from slipping, tripping and falling
The operator of the pump is responsible for traffic safety. If operating fluids escape from the pump, the areas
must be cordoned off accordingly, marked and suitable measures taken.
WARNING
Risk of injury due to stored residual energies
The occurrence of mechanical, pneumatic and electrical residual energies on the pump after actuating the
control element for stopping in an emergency or after switching off the pump must be observed!
WARNING
Danger from hot components and equipment
During operation, media and pump parts can reach high temperatures. Before intervening manually in the
pump, it is therefore necessary to wait until it has cooled down enough to allow safe operation with
protective gloves in order to avoid burns.
WARNING
Shutting down the pump when leaving the operating parameters
Outside the permitted operating parameters, safe operation of the pump can no longer be guaranteed. The
limits of the permissible operating parameters are shown in the chapter 9.2.
WARNING
Risk of injury! Danger of crushing in the hand and arm area due to product assembly.
If activities are carried out for assembly, the employee must be trained in the use of lifting equipment and
have provided proof of this. Use suitable protective equipment!
WARNING
Safety risk due to spare parts not approved by the manufacturer
Becker spare parts have been checked by us for their technical requirements and for their safety. Spare parts
that have not been approved can pose a danger to people and the pump.
NOTE
Wear safety shoes
Foot protection must be worn during all activities at the pump.
NOTE
Wear protective gloves
The pump must cool down until it is safe to carry out activities with protective gloves.
If this time cannot be guaranteed, protective gloves with adequate heat protection must be used. The exact
model can be found in the operator's glove schedule.
2.10 BEHAVIOUR IN CASE OF DANGER AND ACCIDENTS
The protective measures to be taken and the responsibility for drawing up an occupational safety concept lie with the
operator of the workplace.
"The operator must ensure safe use by following the ""Operating conditions"" described in chapter 3."
2.11 REQUIREMENT FOR STABILITY
It is best to install the pump horizontally on a flat surface.
Vertical installation (valve side down) is not permitted.

10 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
2.12 OCCUPATIONAL SAFETY AND HEALTH
The pump has been set up in accordance with the Machinery Directive 2006/42/EC and the relevant occupational
health and safety and accident prevention regulations. Before starting repair work, the pump must be de-energised
and depressurised to prevent accidents. Previously dismantled protective devices must be reattached before
commissioning.
2.13 AIRBORNE SOUND EMISSIONS
According to Directive 2006/42/EC, information on the airborne noise emission of the pump must be given. Exact
details can be found in the Machinery Directive under point 1.7.4.2.
Notes on the pump (see chapter 9.2)
2.14 ERGONOMICS
"With regard to maintenance and servicing, special behaviour with regard to ergonomics, in accordance with
Directive 2006/42/EC Annex i 1.1.6 ""Ergonomics"", must be taken into account:"

11 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
3OPERATING CONDITIONS
The CE conformity of the product only becomes legally valid when all product safety requirements of the "operating
conditions" formulated in this chapter in the sense of Directive 2006/42/EC Annex I 1.7.4.2.i have been fully
implemented by the operator. Only in this case is CE conformity valid and the pump may be operated.
Operating condition 1: Safety instructions for maintenance work
1. Standalone products - not implemented in a control system
In the event of maintenance, work must be carried out with the guards dismantled. This work may only be
carried out when the pump is at a standstill. In order to ensure the safe standstill of the pump, the pump must
be disconnected from the electrical supply and the five safety rules according to DIN VDE 0105 must be
obligatorily observed.
If the pump is implemented in a control system by the operator, the following conditions apply to the
"Maintenance" operating mode:
2. Or, in the case of a shutdown stored in the control system, comply with the requirements of DIN EN
61800-1:2018-11.
Operating condition 2: Ventilation of the operating room
The operator must ensure that the operating room of the pump is sufficiently ventilated.
Operating condition 3: Electrical protection of the motor
The motor must be protected according to the state of the art. It must be protected at least by a suitable protective
device in accordance with DIN EN 60204-1.
Operating condition 4: Ensuring cooling
The volume flow of the cooling must be guaranteed unhindered on the intake side as well as on the exhaust air side.
Operating condition 5: Ensuring unobstructed exhaust air
As standard, the evacuated air is discharged into the environment via the maintenance cover. Optionally, the exhaust
air can be discharged via a connected exhaust air line. In this case, it is essential to ensure that the exhaust air can
flow unhindered through the exhaust air line without any significant counterpressure (< 100 mbar).

12 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
4PUMP DESCRIPTION
This chapter explains the assemblies and components of the pump and how they work.
The following information is intended to help you understand how the pump works. This information can help to
avoid dangers and errors due to incorrect operation.
4.1 GENERAL DESCRIPTION OF THE PUMP
The pump is a classic dry-running rotary vane vacuum pump.
It consists of a housing, the eccentrically installed rotor (2), the radially
moving vanes (3) and the inlet and outlet (4+6).
When the rotor rotates, the intake air flows through the intake filter (5)
into the enlarging chamber (1) until it is shut off by the next slide valve.
The enclosed air is then compressed until the blow-off valve (6) opens
against atmospheric pressure.
4.2 SIZES
Several pumps of different sizes are listed in these operating instructions because they
•work according to the same principle of action,
•have the same intended use,
•are subject to the same legal and normative requirements,
•have a similar construction,
•have similar physical characteristics
•and are also very similar in terms of maintenance/service/commissioning.
4.3 VARIANTS
VT 3.6 (standard)
X series pumps feature extended service lives.
Becker guarantees a slide valve service life of 20,000 operating hours or a maximum of 3 years for this pump.
VT 4.4 (standard)
VT 4.4 DC
Within the VT 4.4-VT 4.8 series, a distinction is made between 2 variants.

13 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
The VT 4.X DC is a special variant with DC drive.

14 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
4.4 COMPONENT ILLUSTRATION
VT 4.2, VT 4.4, VT 4.4 DC, VT 4.8
Position
Component
Function
1
Control box
Electrical connection and control (DC variant)
2
Motor nameplate
Marking of conformity and technical data - Motor
3
Motor
Drive
4
Connection for vacuum line
Suction connection
5
Vacuum regulating valve
Setting the required vacuum
6
Relief valve
Flow optimisation, noise reduction
7
Pump unit
Generation of the vacuum, The pump unit includes pump housing,
piston and slide valve
8
Side cover
Access to intake filter and sliders
9
Unit base
Stable installation and fastening of the pump
10
Terminal box
Electrical connection (standard)
11
Device type plate
Marking of conformity and technical data - Pump
Table 4.4: Component illustration 1

15 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
VT 3.6, VX 3.6
Position
Component
Function
1
Motor
Drive
2
Connection for vacuum line
Suction connection
3
Vacuum regulating valve
Setting the required vacuum
4
Side cover
Access to intake filter and sliders
5
Relief valve
Flow optimisation, noise reduction
6
Pump unit
Generation of the vacuum, the pump unit includes pump housing,
piston and slide valve
7
Device type plate
Marking of conformity and technical data - Pump
8
Terminal box
Electrical connection (standard)
9
Motor nameplate
Marking of conformity and technical data - Motor
10
Unit base
Stable installation and fastening of the pump
Table 4.4: Component illustration 2

16 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
4.5 MOTORS
The characteristics of the motor used can be found on the motor's type plate.
4.6 SAFETY AND PROTECTIVE DEVICES
DANGER
Danger to life due to defective, dismantled and manipulated protective devices
NOTE
For a description of the safety instructions, see chapter 2.9
The protective devices of the pump must not be dismantled, modified or put out of operation. If the protective
devices are dismantled, modified or put out of operation, the pump must be shut down and secured immediately.
Defects in protective equipment must be rectified immediately. All protective equipment must be undamaged, fully
assembled and in working order. Warning and information signs must be clearly visible.
All protective devices must be checked for functionality, damage and completeness after each maintenance of the
pump.
If a maintenance activity requires the dismantling of protective devices, these may only be dismantled for the
duration of the maintenance activity. All protective devices must be completely mounted in the designated place
immediately after completion of the maintenance activities and checked for proper functioning.
The prescribed inspection intervals for protective devices must be observed and complied with. Protective devices
may only be maintained, replaced and serviced by specially trained, instructed and authorised personnel.
Unauthorised tampering and manipulation with the safety-related parts of the pump are strictly prohibited and must
be reported immediately to the responsible body.
All equipment serving safety and accident prevention, such as warning and information signs, covers, protective
coverings, etc., must be in place. The removal or alteration of these facilities is prohibited. Damaged facilities must be
repaired immediately.
Below is an overview of the pump with the designations of the protective devices.
VT 3.6, VX 3.6, VT 4.2, VT 4.4, VT 4.8
Position
Component
Location
1
Engine fan cowl
Front side of the motor
Table 4.6: Safety and protective devices 1
4.7 TESTING THE SAFETY AND PROTECTIVE DEVICES
NOTE
All safety and protective devices must be checked regularly according to chapter 8.3.
The condition and function of safety and protective devices must be checked when:
•Modifications and repairs have been made to the pump
•Damage has occurred to the pump
•maintenance and servicing intervals are to be carried out.

17 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
5TRANSPORT
WARNING
Risk of injury due to incorrect lifting conditions.
NOTE
wear suitable PPE.
NOTE
For a detailed description of the safety instructions, see chapter 2.9

18 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
6INSTALLATION AND COMMISSIONING
6.1 GENERAL REQUIREMENTS
The installation site of the pump should be dry and protected from splash water.
We recommend installing the pump in such a way that maintenance work can be carried out easily. Depending on
the type of variant or accessories fitted, additional free space may be required for this.
When assembling components and assemblies, the following points must be observed to avoid injury and damage to
the pump:
•Third-party components may only be installed if they have been
approved by the manufacturer and comply with the directives and
laws applicable in the country of use.
•Loose and non-pump parts must be removed from the pump
environment after assembly.
•Protruding parts (pipes, cables, etc.) must be properly mounted,
routed and marked.
•Contact points of components must be clean and intact.
ATTENTION
Outside the permitted operating parameters, safe operation of the pump can no longer be guaranteed (for
permitted operating parameters, see chapter 9.2).
The minimum distances between the pump and neighbouring parts must be at least 10 cm. Failure to
maintain the minimum clearances may result in a fire risk due to the high level of heat emitted.
NOTE
Fastening to the substrate
The pump can be installed on solid ground without anchoring. If the pump is to be installed on a
substructure, it is recommended that it be fastened using elastic buffer elements.

19 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
6.2 PREPARATORY ACTIVITIES
6.2.1 CONNECTING THE MEDIA LINE
Remove sealing plug
For transport, the suction connection is protected against the ingress of
dirt and foreign bodies with a sealing plug. This must be removed before
commissioning.
Dimensioning the suction line
Make the pipes at least the same diameter as the nominal connection
size.
For cable lengths > 2 m, the next larger cross-section must be
selected.
For pipe lengths > 5 m we recommend the additional installation of
non-return valves.
Keep connections free of oil, grease, water and other contamination.
The supply line must be installed by means of a flexible hose or fixed pipe
in such a way that no mechanical tension is applied to it.
Size
Connection
VT 4.2
1/4 "
VT 4.4
1/4 "
VT 4.8
3/8 "
VT 3.6
1/2 "
VX 3.6
1/2 "
Table 6.2: Connection sizes (suction side)
6.2.2 ADJUST VALVE
Adjusting the vacuum
The pump is equipped with a vacuum regulating valve, which allows the
vacuum required for the application to be set.
Depending on the size, this value is limited.
Corresponding information can be found in the chapter 9.2.
6.3 ELECTRICAL INSTALLATION
DANGER
Danger to life from electric shock - Personnel qualification
DANGER
Danger to life due to defective, dismantled and manipulated protective devices

20 | VT 4.2, VT 4.4, VT 4.8, VT 3.6, VX 3.6
DANGER
Danger to life due to unexpected start-up
NOTE
For a description of the safety instructions, see Chap. 2.9
The electrical installation of the pump shall comply with the requirements of Directive 2006/42/EC and EN
60204:2019.
If the pump is integrated into a control system, it must be ensured that the pump does not restart automatically after
an undesired voltage drop. The measures against unexpected start-up according to DIN EN ISO 14118:2018-07 must
be implemented. This also applies after a shutdown following an emergency stop.
The following points must be observed when installing the pump:
•The pump must be protected by overload protection. Operation without an appropriate fuse is prohibited.
•The pump may be operated with a maximum of 10 start/stop cycles per hour.
•The supply line of the pump must meet the minimum requirements of the state of the art