LEYBOLD VARODRY VD65 User manual

VARODRY
VD65/VD100/VD160/
VD200
Operating instructions 300766038_002_C3
Part No.
111065Vxx
111100Vxx
111160Vxx
111200Vxx

Copyright notice
©Leybold GmbH. All rights reserved.
Trademark credit
Leybold and the Leybold logo are trademarks of Leybold GmbH, Bonner
Strasse 498, D-50968 Cologne.

1 Safety and compliance. . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Denition of Warnings and Cautions. . . . . . . . . . . . . . . . . . 6
2 Important Safety Information. . . . . . . . . . . . . . . . . . 7
2.1 Mechanical hazards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Electrical hazards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Thermal hazards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Hazards caused by materials and substances. . . . . . . . . . 8
2.5 Noise hazard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6 Risk of damaging the pump. . . . . . . . . . . . . . . . . . . . . . . . 8
3 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Supplied equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Transport and storage. . . . . . . . . . . . . . . . . . . . . . 13
5 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Conforming use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.1 Non-conforming use. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Connect the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4 Removal of pump cover. . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.5 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.6 Optional VFD use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.7 Purge gas/Gas ballast connection (optional). . . . . . . . . . . 17
5.8 Manual Gas Ballast Conguration. . . . . . . . . . . . . . . . . . . 18
5.9 Connecting solenoid gas ballast/purge valves. . . . . . . . . . 19
6 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Switching off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.1 Maintenance schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 Tools required for maintenance. . . . . . . . . . . . . . . . . . . . . 22
7.3 Pump timing belt change. . . . . . . . . . . . . . . . . . . . . . . . . 22
Contents

7.4 Replace the belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.4.1 Disassemble drive enclosure. . . . . . . . . . . . . . . . . . . . . 23
7.4.2 Disassemble rotor disc, screw and fan. . . . . . . . . . . . . 24
7.4.3 Disassemble belt chamber cover. . . . . . . . . . . . . . . . . . 24
7.4.4 Disassemble fail safe gears. . . . . . . . . . . . . . . . . . . . . . 25
7.4.5 Disassemble belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.4.6 Assemble tooth belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.4.7 Assemble motor screw. . . . . . . . . . . . . . . . . . . . . . . . . 28
7.4.8 Assemble fail safe gear. . . . . . . . . . . . . . . . . . . . . . . . . 28
7.4.9 Assemble belt chamber cover. . . . . . . . . . . . . . . . . . . . 30
7.4.10 Assemble fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4.11 Assemble drive enclosure. . . . . . . . . . . . . . . . . . . . . . 31
7.4.12 Electric connection. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.4.13 Verify motor rotation. . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.5 Blow off valve cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.6 Replace electrical motor. . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.6.1 Motor disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.6.2 Motor assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.7 Table: Motor part list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9.1 Waste disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
10 Leybold Service. . . . . . . . . . . . . . . . . . . . . . . . . . . 47
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Contents

Figure 1. Dimensional drawing (mm). . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 2. Transportation of the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 3. Connections and controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 4. Remove the cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 5. Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 6. Arrow - direction of rotation. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 7. Manual gas ballast conguration. . . . . . . . . . . . . . . . . . . . . . 18
Figure 8. Connecting solenoid gas ballast/purge valves. . . . . . . . 19
Figure 9. Tools required for maintenance. . . . . . . . . . . . . . . . . . . . . . . 22
Figure 10. Blow off valve cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
List of Figures

1 Safety and compliance
1.1 Denition of Warnings and Cautions
NOTICE:
For safe operation from the start, read these instructions carefully before you install or
commission the equipment and keep them safe for future use.
Read all the safety instructions in this section and the rest of this manual carefully
and make sure that you obey these instructions. The equipment must only be
operated and maintained by trained personnel in the proper condition and as
described in this instruction manual.
Obey local and state requirements and regulations. If you have any questions about
safety, operation or maintenance of the device, please contact our nearest subsidiary.
Important safety information is highlighted as warning and caution
instructions. Obey these instructions.
WARNING:
If you do not obey a warning, there is a risk of injury or death. Different symbols are
used according to the type of hazard.
CAUTION:
If you do not obey a caution, there is a risk of minor injury, damage to equipment,
related equipment or process.
NOTICE:
Information about properties or instructions for an action which, if ignored, will cause
damage to the equipment.
We reserve the right to change the design and the stated data. The
illustrations are not binding.
Keep the instructions for future use.
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Safety and compliance

2 Important Safety Information
Pressures given in bar or mbar are absolute values. If exceptionally a gauge
pressure is meant, a “g” is added (for example, bar (g)).
2.1 Mechanical hazards
WARNING:
When rotated in the wrong direction, the pump will generate up to 4.5bar (g) pressure
at the inlet. If a vacuum system is connected, the pressure build up can lead to
explosion of the system.
1. Avoid exposing any part of the human body to the vacuum.
2. Select a secure place for the appliance (level surface).
3. Never operate the pump without a connected intake line or without
tting a blank ange.
4. The discharge port of the pump must not be blocked or constricted.
Never operate the pump with a seal-off stopper in place blanking off
the exhaust port. Operate the pump only with a connected vacuum
system to the intake ange.
5. With a closed exhaust pipe, the pump can generate up to 1.5 bar (g)
overpressure on the exhaust. The exhaust pipes should be laid out
accordingly.
6. Condensates from the pump can collect inside or at the exhaust,
escape and spill onto the oor, when operating the pump without an
exhaust line or during transport with an exhaust being not blanked off.
In this case there exists the risk of slipping.
7. Take note of the labelling of inlet and outlet. A mix-up can lead to
dangerous build-up of pressure in the vacuum system or in the
system. After each change of the electrical connection, check the
pump's rotational direction.
8. In case of power supply outage, the vacuum system is ventilated by
the pump. If this is not wanted, install a non-return valve at the inlet.
9. After a loss of power, the pump restarts independently. If this is not
wanted, install a restart inhibitor.
10. Do not operate the pump with any of the covers removed. This may
result in serious injury.
2.2 Electrical hazards
DANGER:
After a mains power failure the pump will run up automatically again. This also applies
in the case of an emergency shut-down. In order to prevent the pump from running
up automatically again, the pump must be integrated within a control arrangement
such that it can only be switched on manually again after the mains power has
returned.
1. Housing parts must not be removed.
2. The electrical connection must only be provided by a trained person.
3. Obey the national regulations in the country of use like EN 50110-1 for
Europe.
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Important Safety Information

4. Note the information on the IP type of protection.
2.3 Thermal hazards
CAUTION:
The surface of the pump may attain temperatures over 80 °C. There is the risk of burn
injury.
1. Before servicing and maintenance work, always leave the pump to
cool down.
2.4 Hazards caused by materials and substances
DANGER:
Before commissioning the pump, make sure that the media which are to be pumped
are compatible with each other so as to avoid hazardous situations. Observe the
instructions for proper and improper use of the pump in Conforming Use.
2.5 Noise hazard
CAUTION:
The noise level of the pump during ultimate pressure operation corresponds to the
values stated in the technical data. In other operating modes and depending on the
connected vacuum system, higher values can be expected. Make sure that suitable
protection measures are taken to protect your hearing.
2.6 Risk of damaging the pump
1. Before starting up for the rst time, the motor circuit must be equipped
with a suitable protective motor switch. Please take note of the
information in these Operating Instructions and on the electric motor
(wiring diagram).
2. Do not allow the ingestion of objects (screws, nuts, washers, pieces of
wire, etc.) through the inlet port. If required, use an inlet lter.
3. Do not use the pump for applications that produce abrasive or
adhesive powder vapour sales or service department for advice.
4. This pump is suited for pumping water vapour within the specied
water vapour tolerance limits.
5. Avoid vapour that can condense into liquids when being compressed
inside the pump, if these substances exceed the vapour tolerance of
the pump.
6. In the case of wet processes we recommend the installation of liquid
separators upstream and downstream of the pump as well as the use
of the gas ballast.
7. The exhaust line should be laid so that it slopes down and away from
the pump so as to prevent condensate from back streaming into the
pump.
8. Avoid the entry of particles and uids.
9. The air intakes of the pump and the motor must remain free.
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Important Safety Information

3 Description
The pump is a dry-compressing vacuum pump and can evacuate containers
in the rough vacuum range.
The pump is connected to a 3-phase network on the motor terminal board
and operated directly from the mains. It is air-cooled and requires minimum
maintenance.
3.1 Supplied equipment
The pump is delivered ready for operation. Intake and exhaust anges are
covered with caps.
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Description

3.2 Technical data
Table 1 Technical data
VARODRY 65 100 160 200
Maximum pumping speed without gas ballast 65 m3/h 105 m3/h 150 m3/h 200 m3/h
Ultimate pressure without gas ballast 0.01 mbar
Ultimate pressure with gas ballast 0.1 mbar
Maximum permissible inlet pressure 1200 mbar
Maximum permissible discharge pressure
(Relative to ambient)5) 200 mbar
Water vapour tolerance with gas ballast4) 60 mbar
Water vapour capacity with gas ballast 4) 1.9 kg/h 2.9 kg/h 5.2 kg/h 6.9 kg/h
Permissible ambient temperature 0 to +40 °C
Storage temperature -20 to +60 °C
Purge gas consumption 5 slm
Purge gas supply pressure (optional) 2-4 bar (g)
Gas consumption exhaust purge (optional) 7.5-16 slm
Gas consumption inlet purge (optional) 2.5-5 slm
Noise level without external silencer, at ultimate pres‐
sure (according to DIN EN ISO 2151)
▪50 Hz versions 67 dB(A) 70 dB(A)
▪60 Hz versions 70 dB(A) 73 dB(A)
Relative ambient atmospheric humidity 95%, non-condensing
Maximum installation height1) Up to 1000 m above sea level
Cooling Air
Mains voltage 50 Hz versions 2) 400 V ± 10% or 200 V ± 10%
Mains voltage 60 Hz versions 2)
460 V ± 10% or 230 V ± 10%
or
200/380 V ± 10% , 3 ph
Phases 3-ph
Maximum current 50 Hz versions 200/400 V3) 6.4/3.2 A 8.6/4.3 A 13.0/6.7 A 15.5/7.5 A
Maximum current 60 Hz versions 230/460 V3) 5.6/2.8 A 7.6/3.8 A 11.3/5.7 A 13.7/6.5 A
Maximum current 60 Hz versions 200/380 V3) 6.0/3.4 A 8.3/4.6 A 12.8/6.9 A 15.5/8.9 A
Maximum power consumption 1500 W 2200 W 3000 W 4000 W
Permissible motor speed 2) 50/60 Hz
Protection class IP 55
Intake connection G 2"
Discharge ange DN G 1 1/2"
Weight (approximate) 105 kg 115 kg 130 kg 140 kg
1) Please inquire for installation heights above 1000 m.
2) Depending on version 50 or 60 Hz. Please see pump nameplate.
3) Motor protective switch must be suitable for operation with IE3 motors.
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Description

4) Depending on installed conguration. Please see Purge Gas/Gas Ballast Connection
(optional) on page 17 for details.
5) Up to 200 mbar possible depending on the inlet pressure of the pump. With higher outlet
pressure, the ultimate pressure will be higher.
Figure 1. Dimensional drawing (mm)
1. Optional inlet position1. Optional inlet position
Variable dimensions VD65 VD100 VD160 VD200
A 773 865 1060 1060
B 670 762 957 957
C 402 494 647 647
D 253 294 370 370
3.3 Accessories
Table 2 Accessories
Centering ring, aluminium, FPM DN 40 ISO-KF 18208
Clamping ring, aluminium DN 40 ISO-KF 18343
Inlet adapter G 1¼" 111005A21
Inlet adapter DN40 ISO-KF 111005A20
Inlet adapter DN63 ISO-K 111005A24
Exhaust adapter DN40 ISO-KF 111005A30
Replacement timing belt 50 Hz versions EK6528531
Replacement timing belt 60 Hz versions EK6528533
Belt replacement tool kit EK6530942
Pump ushing kit 111005A00
Inlet non return valve (for operation > 10 mbar) 111005A15
Inlet adapter NPT 1¼ - 11.5 111005A22
Inlet adapter NPT 2 - 11.5 111005A23
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Description

Exhaust adapter NPT 1½ - 11.5 111005A31
Blow off valve replacement kit EK6525317
Caster kit 111005A50
Fail safe gear replacement kit EK6528264
Inlet non return valve repair kit EK1637009390
Variable speed drive 111005A60
Variable speed drive 111005A61
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Description

4 Transport and storage
Refer to Figure: Correct lifting of pump. Transport the pump on a pallet or
with a crane using both lifting eyes at the top of the pump. Never try to lift
the pump on just one lifting eye.
Storage
Store the pump in a dry place, preferably at room temperature. The pump
must be sealed with the supplied end caps.
Figure 2. Transportation of the pump
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Transport and storage

5 Installation
Figure 3. Connections and controls
1. Cooling air - out 2. Inlet ange
3. Cooling air - out 4. Exhaust ange
5. Purge gas port (optional) 6. Electrical feedthroughs
7. Lifting eye 8. Cooling air - in
1. Cooling air - out 2. Inlet ange
3. Cooling air - out 4. Exhaust ange
5. Purge gas port (optional) 6. Electrical feedthroughs
7. Lifting eye 8. Cooling air - in
5.1 Placement
The cooling air intake and outlets must not have a blockage to prevent
insufcient cooling of the pump. Refer to Figure: Connections and
controls.
5.2 Conforming use
The pump is designed for use in light and medium industrial applications.
The pumps are capable to handle small amounts of dust and liquids,
however the use of inlet lters or liquid traps is recommended in such cases.
They are not hermetically sealed and will release small amounts of pumped
gases to ambient even if the exhaust port is connected to an exhaust
pipework. They are suitable for pumping water steam or vapours
continuously at a suction pressure range of 0.01 mbar to 1050 mbar as well
as for cyclic pump operations within this pressure range.
If you use the pump to handle Oxygen, take note of the following:
▪To avoid hazardous oxygen concentrations outside the pump, you
must use the seal purge on the exhaust side of the pump. Refer to
Purge gas/Gas ballast connection (optional) on page 17.
▪The pump must be tightly connected to an exhaust pipework to
discharge the pumped gas safely. Make sure that the exhaust pipe is
tightly connected to the pump and the exhaust pipework.
▪If the amount and concentration of oxygen pumped is considered to
be safely discharged directly from the pump (room ventilation is
sufcient) the pump can be operated without being connected to an
exhaust pipework. The user is responsible to do a risk assessment and
decide on the use of exhaust pipework..
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Installation

5.2.1 Non-conforming use
The pump is not suited for pumping of:
▪Radioactive substances
▪Explosive substances
▪Ignitable gas mixtures
▪Pyrophoric gases
▪Liquids
▪Media in signicant amounts condensing in the pump (Except from
water)
▪Solids
▪Corrosive gases
▪Toxic gases
5.3 Connect the pump
Remove the caps. We recommend that you retain the caps for
decommissioning of the pump.
▪During installation work on the intake and discharge lines do not
subject anges to any excessive stresses.
Intake side
▪At the intake side, connect the pipework to the vacuum chamber.
▪The intake line must be clean. Deposits in the intake line can degas
and impair the vacuum. The connecting anges must be clean and
undamaged.
Note:
Do not allow the ingestion of any objects (screws, welding beads, nuts,
washers, pieces of wire, etc.) through the intake port of the pump.
Exhaust line
DANGER:
The operator must check, whether the pumped gases will lead to safety risks on the
environment if the pump is operated without an exhaust line (i.e. risk of suffocation,
risk of slipping due to condensing vapours, etc.).
CAUTION:
Smaller cross sections may cause an undesirable overpressure within the system. Do
not start the pump with a constricted or blocked exhaust. Ensure that any valves or
blocking devices in the exhaust line are open. Clogged exhaust lines will reduce the
available pumping speed, increase temperature and cause overloading of the pump
motor or a dangerous overpressure within the system. There is the risk of bursting.
The pump can generate pressures up to 1.5 bar (g) at the exhaust, when the
discharge line is shut.
▪Connect the exhaust line with a hose/pipework to the pump, or when
operating the pump without a connected exhaust line, operate the
pump only in a well ventilated room.
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Installation

▪The cross-section of the exhaust line must at least match the inside
diameter of the connections.
▪When pumping vapours, we recommend connecting a condensate
separator at the exhaust. The exhaust lines should be laid so that they
drop down and away, thereby preventing condensate from owing
back into the pump.
5.4 Removal of pump cover
In order to access the electrical terminals, the purge gas or gas ballast
connections the pump cover has to be removed. To do the pump
maintenance, remove only the front cover of the pump.
To remove the pump cover, do the following steps:
1. Allow the pump to cool down in order to avoid receiving burns from
hot surfaces underneath the cover.
2. Disconnect the inlet ange from the vacuum system.
3. Remove the four side screws of front pump cover. Figure: Remove
the cover.
4. Slide the front cover by hand and remove from the pump.
5. Remove the four side screws of back pump cover.
6. Slide the back cover by hand and remove from the pump.
Figure 4. Remove the cover
1. Front cover 2. Back cover1. Front cover 2. Back cover
5.5 Electrical connection
The pump is supplied with three-phase motor but without accessories for
electrical connection. They must be connected with the appropriate cable,
and a suitable motor protection switch.
The pump cover must be removed to connect the motor cable.
Set the switch in accordance with the rating on the pump nameplate.
Please observe the diagram inside the motor junction box.
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Installation

Figure 5. Electrical connection
After connecting the motor and after every time you alter the wiring, check
the direction of rotation. To do so, briey switch on the motor and make sure
that the pump fan rotates in counter-clockwise direction. If not, interchange
two phases of the connection.
An arrow (sticker) indicating the correct direction of rotation is placed on the
drive cover. To avoid damage to the pump or the vacuum system make sure
that the inlet of the pump is not connected to a closed vacuum system
when doing this test. Running the pump at full speed in the wrong direction
of rotation will generate pressures up to 4.5 bar (g) at the inlet port, if not
vented to atmosphere.
Figure 6. Arrow - direction of rotation
5.6 Optional VFD use
If desired the pumps can be operated via an external variable frequency
drive (VFD). However it is not allowed to run the pump with more than the
nominal speed. A range of suitable VFDs is available as accessories. Please
consult us if other types of VFDs shall be used. The permissible motor
speed dened in the Technical data on page 10 must be obeyed.
Please note that the pump performance and power consumption is not a
linear function of motor speed.
5.7 Purge gas/Gas ballast connection (optional)
The pump has a gas ballast system and an optional seal-purge system. It
consists of three components.
1. Gas ballast
The pump is equipped with a gas ballast which feeds ambient air into
the pump to dilute condensable vapours and keep the partial pressure
below the condensation level. The pump water vapour tolerance is 60
mbar. A high vapour tolerance will reduce the vacuum performance of
the pump. If the presence of condensable vapours in the pumped
gases can be ruled out the gas ballast can be closed. Using the gas
ballast will improve the vapour handling but reduce the vacuum
performance of the pump.
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Installation

2. Seal purge exhaust side (optional)
The pump has no hermetically sealed shaft feedthroughs at the
exhaust side. Therefore small amounts of gases inside the pump will
escape into the ambient air if no seal purge is used. In order to avoid
this the shaft seals at the exhaust side can be loaded with purge gas.
The purge gas will create a gas barrier that will prevent gas from inside
the pump to escape. Note that a fraction of the purge gas will also
escape to the ambient. Make sure that the pump is operated in a room
with good ventilation if other gases than air are used as purge gas.
3. Seal purge inlet side
Inlet seal purge can be used if there is a risk that harmful amounts of
dust or condensable vapours are present at the inlet of the pump.
Such substances could migrate to the inlet side bearings of the pump
and reduce the service interval signicantly. The inlet side purge is
typically only used whenever the inlet pressure increases and is active
until a pressure equalisation is reached.
Based on the type, the pump has either a manual gas ballast or 3
solenoid valves for inlet & outlet seal purge and gas ballast mounted
underneath the pump enclosure.
5.8 Manual Gas Ballast Conguration
The pump with manual gas ballast (standard version) is delivered with
components that can be mounted to the pump body in order to achieve
different water vapour tolerances.
When changing the setup, make sure that the gaskets are in good condition
and that the parts are tightened properly.
Figure 7. Manual gas ballast conguration
A. Vapour tolerance 60 mbar B. No gas ballastA. Vapour tolerance 60 mbar B. No gas ballast
1. Non return valve 2. Nozzle
3. Silencer/Filter 4. Plug (no gas ballast)
1. Non return valve 2. Nozzle
3. Silencer/Filter 4. Plug (no gas ballast)
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Installation

5.9 Connecting solenoid gas ballast/purge valves
The pump with solenoid valves (optional) has three separate valves as
shown in Figure: Connecting solenoid gas ballast/purge valves.
Connect 24 V DC (!) supply voltage to the solenoid valves that will be used in
the application. The valves can be activated independently depending on
the application requirements.
Figure 8. Connecting solenoid gas ballast/purge valves
A. Vapour tolerance 60 mbarA. Vapour tolerance 60 mbar
1. Exhaust seal purge 2. Not used
3. Inlet seal purge 4. Non return valve
5. Nozzle 6. Silencer/Filter
7. Purge gas port 8. Feedback for cables
1. Exhaust seal purge 2. Not used
3. Inlet seal purge 4. Non return valve
5. Nozzle 6. Silencer/Filter
7. Purge gas port 8. Feedback for cables
19
300766038_002_C3 - 09/2021 - © Leybold
Installation

6 Operation
Start the pump by applying the supply voltage. The pump can be started up
to 20 times per hour.
WARNING:
Connect the pump to an exhaust gas pipework if other gases than clean air are
pumped.The exhaust of the pump must not be blocked or constricted. Never operate
the pump with the seal-off stoppers in place blanking off the exhaust port.
6.1 Switching off
Switch off the pump by disconnecting from the mains voltage.
If condensable vapours have been conveyed, operate the pump for 30
minutes with closed process valve and open gas-ballast before switching off
in order to evaporate the residual condensate.
The pump will run down for several seconds. Due to the design, the vacuum
system is then vented through the pump, if no valve is closed between the
pump and the vacuum system. In this case, the pump runs backwards until
the pressure is equalised. In case of vacuum chambers exceeding a dened
volume a valve must be closed before switching off the pump to avoid over-
speeding of the pump and contamination of the vacuum system with dust
streaming back from the exhaust pipework.
The maximum chamber sizes to be vented through the pump are:
VARODRY VD 65: 500 l
VARODRY VD 100: 800 l
VARODRY VD 160-200: 1000 l
The ventilation process may take several minutes, depending on the size of
the container. Wait for the pressure equalisation before opening the vacuum
system or disconnecting the pump from the vacuum system.
In order to avoid back-venting of the vacuum chamber close the inlet of the
pump with a valve before switching off. A suitable inlet non return valve is
available as optional accessory.
300766038_002_C3 - 09/2021 - © Leybold
20
Operation