BUSCH WY 0500-2000 C User manual

Installation and Operating
Instructions
Vacuum pumps
WY 0500-2000 C
Ateliers Busch S.A.
Zone industrielle
2906 Chevenez
Switzerland
0870566625/ 181015/ Original instructions / Modifications reserved

Table of Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Product description . . . . . . . . . . . . . . . . . . . . . . . . . 3
Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Principle of operation . . . . . . . . . . . . . . . . . . . . . . . 3
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
On/ Off switch . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Sound Emissions . . . . . . . . . . . . . . . . . . . . . . . . . 4
Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Transport in Packaging . . . . . . . . . . . . . . . . . . . . . . 4
Transport without packaging . . . . . . . . . . . . . . . . . . . 4
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Short-term Storage . . . . . . . . . . . . . . . . . . . . . . . . 5
Removal of the pump . . . . . . . . . . . . . . . . . . . . . . 5
Conservation . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Commissioning after conservation . . . . . . . . . . . . . . . 5
Installation and Commissioning . . . . . . . . . . . . . . . . . . 5
Installation Prerequisites . . . . . . . . . . . . . . . . . . . . . 5
Local installation . . . . . . . . . . . . . . . . . . . . . . . . 5
Configuration of the pump: . . . . . . . . . . . . . . . . . 6
Suction Connection . . . . . . . . . . . . . . . . . . . . . . 6
Discharge connection . . . . . . . . . . . . . . . . . . . . . 6
Electrical connection/ Controls . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical connection . . . . . . . . . . . . . . . . . . . . . . 7
Electrical motor connection . . . . . . . . . . . . . . . . . . 7
Connecting lines/ piping . . . . . . . . . . . . . . . . . . . . 7
Filling up with Oil . . . . . . . . . . . . . . . . . . . . . . . 7
Saving the Operating Parameters . . . . . . . . . . . . . . . 8
Recommendations on operation . . . . . . . . . . . . . . . . . 8
Application. . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cooling water . . . . . . . . . . . . . . . . . . . . . . . . . 9
Limitations of use . . . . . . . . . . . . . . . . . . . . . . . 9
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . 9
Weekly . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Monthly: . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Every 6 Months:. . . . . . . . . . . . . . . . . . . . . . . 9
Yearly:. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Every 16000 Operating hours, at the latest after 4 years . . 9
Checking the oil . . . . . . . . . . . . . . . . . . . . . . . . . 9
Checking the oil level at the gears and bearing housings . . . . 9
Checking the colour of the oil . . . . . . . . . . . . . . . . 10
Life span of the oil at the gears and the bearings . . . . . . . . 10
Oil Change . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Draining used oil from the gears and the bearings . . . . . . 10
Filling in fresh oil for the gears and the bearings . . . . . . . 10
Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Removal from Service . . . . . . . . . . . . . . . . . . . . . . . 11
Temporary Removal from Service . . . . . . . . . . . . . . . . 11
Recommissioning . . . . . . . . . . . . . . . . . . . . . . . . 11
Dismantling and Disposal . . . . . . . . . . . . . . . . . . . . 11
Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Gasket kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Full service kit . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Oil type. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 15
EU-Declaration of Conformity . . . . . . . . . . . . . . . . . . . 19
Introduction
Page 2
Introduction
Congratulations on your purchase of the Busch. With careful
observation of the field’s requirements, innovation and continuous
development, Busch delivers modern vacuum and pressure solutions
worldwide.
These operating instructions contain information on
–product description,
–security,
–transport,
–storage,
–installation and commissioning
–maintenance,
–overhaul,
–troubleshooting
of the vacuum pump.
For the purpose of these instructions, “handling” the vacuum system
means the transport, storage, installation, commissioning, influence on
operating conditions, maintenance, troubleshooting and overhaul of
the vacuum system.
Prior to handling the vacuum system, these operating instructions
must be read and understood. If anything remains to be clarified
please contact your Busch representative!
Keep these operating instructions and, if applicable, other relevant
operating instructions available and accessible on site.

Use
gases.
d.
Cooling
motor.
Page 3
IN
RT
OUT
IN Inlet
RT Rotor
NP Nameplate
OSG
OFP
DA
OFP
DA
IN
OUT
MP, ODP
OSG
NP
CWI
CWO
MP, ODP
CWO
CWI
CWO
CWI
MTB

Water must be neutral and clean. It must fulfil the following
conditions:
Temperature of water: 10-30°C at inlet
Quantity of cooling water :
WY 0500-1250 C: 2-4 l/min.
WY 2000 C: > 2 l/min. per cooling coil
To ensure the flow rate regulation of the cooling water, we
recommend to fit a regulating valve at the cooling water inlet.
WY 0500-1250 C:
The water cooling connection can be made using flexible hoses or
water pipes (connection 1/4"). The water outlet must be without
pressure.
Initial filling up with cooling water:
- Remove the safety caps from the connections.
- Connect up the hose at the water inlet.
- Fill in water until water flows out at the outlet.
- Connect up the hose at the water outlet.
WY 2000 C:
The Roots WY 2000 C has cooling systems in both cylinder covers
(cooling coils). These cooling systems are separated from each other.
Cooling water connection:
The cooling water connection can be made with flexible hoses or water
pipes (Connection: 1/4"). The water outlet must be without pressure.
Initial filling-up with cooling water
- Remove the safety caps from the connections. Connect up the two
hoses at the water inlet.
- Fill in water until water flows out at the outlet.
- Connect up the two hoses at the water outlet.
On/ Off switch
The vacuum pump comes without on/ off switch. The control of the
vacuum pump must be provided in the course of the installation
Safety
Intended use
DEFINITION: For the purpose of these instructions, “handling” the
vacuum pump means the transport, storage, installation,
commissioning, influence on operating conditions, maintenance,
troubleshooting and overhaul of the vacuum pump.
The vacuum pump is intended for industrial use. It must be handled by
qualified personnel only.
The different applications for use and operational limits of the
vacuum pump as laid out in the “Product Description” and the
“Installation Prerequisites” of the vacuum pump must be observed
both by the manufacturer of the machinery into which the vacuum
pump is to be incorporated and by the end user.
The maintenance instructions must be observed.
Prior to handling the vacuum pump these operating instructions must
be read and understood. If anything remains to be clarified please
contact your Busch representative!
Safety notes
The vacuum pump has been designed and manufactured in accordance
with the latest technical and safety standards. Nevertheless, residual
risks may remain. These operating instructions and the pump itself
inform about potential hazards where appropriate. Safety instructions
can be detected through the keywords, DANGER, WARNING and
CAUTION as follows:
DANGER
Disregard of this safety instruction will always lead to accidents
with fatal or serious injuries.
WARNING
Disregard of this safety instruction may lead to accidents with fatal
or serious injuries.
CAUTION
Disregard of this safety instruction may lead to accidents with minor
injuries or property damage.
Sound Emissions
Refer to the table “Technical Properties” for the permissible sound
levels in free field conditions according to EN ISO 2151.
CAUTION
The vacuum pump emits sounds of high intensity.
Risk of hearing damage.
Users spending a longer period of time in the vicinity of a non-
insulated vacuum pump must wear suitable hearing protection.
Transport
Roots vacuum pumps undergo a rigorous operating test in the factory
and are packed carefully to avoid transport damage.
The inlet and outlet flange are sealed with plugs so that no dirt can
enter the pump during transport. These covers must be removed
before connecting up the pump.
Please check packaging for transport damage on delivery.
The packaging materials must be disposed of in accordance with
applicable environmental protection regulations, or re-used.
These operating instructions are part of the delivery packaging
consignment.
Pumps are generally shipped without oil.
Operating the vacuum pump without oil will destroy the pump!
Transport in Packaging
Packed on a pallet the vacuum pump can be transported with a forklift.
CAUTION
Horizontal gas flow: make sure that the vacuum pump is correctly
fixed on the pallet.
Transport without packaging
In case the vacuum pump is bolted to a pallet or a base plate :
uRemove the fixing bolts between the vacuum pump and the
pallet/ base plate
CAUTION
Do not walk, work or stand under suspended loads.
CAUTION
Please check out the weight of the vacuum pump before lifting it up
(see "Technical Data").
Use adequate lifting gear for this.
Safety
Page 4

NOTE: To lift the vacuum pump, it is necessary to add belts or ropes at
suitable points around the pump body.
If a vacuum pump without drive motor must be lifted, attach another
belt/rope at a suitable point. If other components are fitted to the
pump, attach another belt/rope at a suitable point (motor flange etc.).
lAttach lifting gear securely around the cylinder body
lAttach lifting gear to a crane hook equipped with a safety latch
lLift the vacuum pump with a crane hook
In case the vacuum pump was bolted to a pallet:
uRemove the stud bolts from the rubber feet
CAUTION
Tilting a vacuum pump that is already filled with oil can cause large
quantities of oil to flow into the cylinder.
Starting the vacuum pump with excessive quantities of oil in the cy-
linder will immediately break the lobes and destroy the vacuum
pump.
Once the vacuum pump is filled with oil it must not be lifted any
more.
lPrior to every transport make sure that the oil has been drained
(unless recommended otherwise)
Storage
Short-term Storage
lMake sure that the suction connection/ gas inlet and the discharge
connection/ gas outlet are closed (fit the provided plugs)
lStore the vacuum pump
–if possible in its original packaging,
–indoors,
–dry,
–dust free
–vibration free
Switching off and conservation of the pump
Removal of the pump
Before starting up a vacuum pump that has been stored outside the
building for a while, the vacuum pump must be moved to a room with
ambient temperature, where it should rest for a day.
Conservation
In case of adverse ambient conditions (e.g. aggressive atmosphere,
frequent temperature changes) the vacuum pump must be preserved
after one week using a conservation agent inside the cylinder. In case
of favourable ambient conditions, the pump must be preserved using a
conservation agent inside the cylinder if the pump is to be stored for
more than 3 months.
lMake sure that the oil level at the gears and bearings is between
the MIN and MAX markings of the oil sight glasses
lMake sure that all openings are firmly closed; seal all openings that
are not closed with PTFE-tape, gaskets or o-rings, with adhesive
tape.
lWrap the vacuum pump in VCI film
NOTE: VCI stands for “Volatile Corrosion Inhibitor”. VCI-products
(film, paper, cardboard, foam) evaporate a substance that condenses in
molecular thickness on the packed good and by its electrochemical
properties effectively suppresses corrosion on metallic surfaces.
However, VCI-products may attack the surfaces of plastics and
elastomers. Seek advice from your local packaging dealer! VCI
packaging ensures good protection against corrosion for a few years,
even in the most extreme of conditions such as see transport and
prolonged storage.
lStore the vacuum pump
–if possible in its original packaging,
–indoors,
–dry,
–dust free and
–vibration free
Repeat the conservation process after 12 months of standstill.
CAUTION
Before a new conservation process or re-installation of the vacuum
pump, make sure that the gasket, plug or adhesive tape from the
suction and discharge connections are removed.
Commissioning after conservation
lMake sure that all gaskets, plugs or adhesive tape are removed
from the openings
lMake sure that the oil level at the gears and bearings is between
the MIN and MAX markings of the oil sight glasses
lCommission the vacuum pump as described in the chapter “Instal-
lation and Commissioning”
Installation and
Commissioning
Installation Prerequisites
CAUTION
In case of non-compliance with the installation prerequisites, parti-
cularly in case of insufficient cooling:
Risk of damage or destruction of the vacuum pump and adjoining
system components!
Risk of injury!
The installation prerequisites must be complied with.
lMake sure that the integration of the vacuum pump is carried out
in such a way that the essential safety requirements of the Ma-
chine Directive 2006/42/EC are complied with (regarding the res-
ponsibility of the designer of the machinery into which the vacuum
pump is to be incorporated; see also the note in the EC-Declaration
of Conformity)
Local installation
lMake sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
lMake sure that the following ambient conditions are adhered to:
–Ambient temperature: see “Oil”
–Ambient pressure: atmospheric
Storage
Page 5

lMake sure that the environmental conditions comply with the pro-
tection class of the drive motor (according to the nameplate)
lMake sure that the vacuum pump is placed on or fastened to a
horizontal surface
lMake sure that the vacuum pump is level and even
lMake sure that the vacuum pump cannot inadvertently or intentio-
nally be used as a support for heavy objects
lMake sure that the vacuum pump cannot be hit by falling objects
lMake sure that the vacuum pump is at least 0,5 m away from any
wall to ensure sufficient cooling
lMake sure that no temperature- sensitive components (plastics,
wood, cardboard, paper, electronics) come into direct contact with
the hot surface of the vacuum pump
lMake sure that the installation site or assembly area is ventilated in
such a way that adequate cooling of the vacuum pump is
guaranteed
CAUTION
During operation the surface of the vacuum pump can exceed tem-
peratures of 70°C.
Risk of burns!
lMake sure that the vacuum pump cannot be touched inadvertently
during operation, provide a guard if necessary
lMake sure that the oil sight glasses (OSG,33/220) remain easily
accessible
If the oil change is meant to be performed on site:
uMake sure that the oil drain plugs (ODP,252/262) and the oil
filler plugs (OFP,250/260) remain easily accessible
Configuration of the pump:
Vertical gas flow
Suction Connection
CAUTION
Do not put hands into the inlet aperture.
Risk of body damage!
CAUTION
The ingress of foreign particles or liquids can destroy the vacuum
pump.
In case the inlet gas contains dust or other foreign solid particles:
uMake sure that a suitable filter is installed upstream of the va-
cuum pump
lMake sure that the suction line fits the suction flange/ gas inlet of
the vacuum pump
lMake sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
When using pipes:
uMake sure that the pipe does not exercise any pressure on the
vacuum pump’s connection, use bellows if necessary
If two or more vacuum pumps work on the same suction line, if the
volume of the vacuum system is large enough to draw back oil after
having been switched off, or if the vacuum must be maintained after
switching off the vacuum pump:
uProvide a manual or automatic operated valve (=non-return
valve) in the suction line
(the non-return valve that is installed inside the suction connection is
not meant to be used for this purpose!)
If the vacuum pump is intended to be used for the drawing of gases
that contain limited quantities of condensable vapour :
uProvide a shut-off valve, a drain line and a drain tap in the suc-
tion line, so that condensates can be drained from the suction
line
lMake sure that the suction line does not contain foreign matter,
e.g. welding slag
Discharge connection
CAUTION
Do not put hands into the outlet aperture.
Risk of body damage!
The following guidelines for the discharge line do not apply if the
drawn air is discharged into the environment directly at the vacuum
pump.
lMake sure that the discharge line fits the gas discharge of the va-
cuum pump
When using pipes:
uMake sure that the pipe does not exercise any pressure on the
discharge connection, use bellows if necessary
lMake sure that the discharge line’s diameter over its entire length
is at least as large as the diameter of the gas discharge of the va-
cuum pump
In case of very long discharge lines, it is advisable to use a larger
diameter piping in order to avoid a loss in efficiency and an overload
on the vacuum pump. For advice please contact your local Busch
representative!
lMake sure that the discharge line either slopes away downwards
from the vacuum pump or provide a liquid separator or a drain line
with a drain tap, so that no liquids can be drawn back into the va-
cuum pump
CAUTION
Using the pump with the gas discharge connection closed will da-
mage the vacuum pump.
Make sure that the gas discharge connection is open.
WARNING
Discharge lines made from non-conducting material can build up
electrostatic charge.
Electrostatic discharge can lead to explosion of potentially present
oil mist.
The discharge line must be made of conducting material or provi-
sions must be made against electrostatic discharge.
Electrical connection/ Controls
lMake sure that the regulations acc. to the EMC-Directive
2004/108/EC as well as the EN-standards, electrical and occupa-
tional safety directives and the local or national regulations, respec-
tively, are complied with (this is in the responsibility of the designer
of the machinery into which the vacuum pump is to be incorpora-
ted; see also the note in the EC-Declaration of Conformity)
lMake sure that the power supply is compatible with the specifica-
tion on the nameplate of the drive motor
lMake sure that an overload protection according to EN 60204-1 is
provided for the drive motor
lMake sure that the drive of the vacuum pump will not be affected
by electric or electromagnetic disturbance from the mains; if neces-
sary contact the Busch service for advice
Installation and Commissioning
Page 6

In case of mobile installation:
uMake sure that the vacuum pump is switched off and cannot
accidentally be switched on again
lIf the Roots blower is used in a vacuum system where a vacuum
pump is connected upstream, the vacuum pump can only be star-
ted up after the primary pump has gone into operation.
Installation
Fitting
lMake sure that the “Installation Prerequisites” are complied with
lFit or mount the vacuum pump at its final location
Electrical connection
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by qualified per-
sonnel that knows and observes the following regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or corresponding national accident prevention
regulations.
CAUTION
The wiring diagrams given below are typical. Depending on specific
purchase orders or certain markets different wiring diagrams may
apply
Risk of damage to the drive motor!
The inside of the terminal box must be checked for correct drive
motor wiring diagrams/ instructions.
lElectrically connect the drive motor
lConnect the earth line
Electrical motor connection
CAUTION
When connecting up the wires into the terminal box: please make
sure the tightening torque of 3 Nm is adhered to and check with a
calibrated torque wrench (Nuts M6).
Three phase motor connection:
Star connection (High voltage):
Delta connection (Low voltage):
CAUTION
Operation in the wrong direction of rotation can destroy the va-
cuum pump within a very short period of time.
Risk of explosion of the drive motor!
Prior to starting-up make sure that the vacuum pump is to be opera-
ted in the right direction.
lMake sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
lSwitch on the drive motor for a fraction of a second only
lDetermine the rotation sense of the motor by using a measure tool
or putting a rubber plate on the inlet.
lMake sure that the vacuum pump draws in
If not, the direction of rotation has to be changed :
uExchange two of the three feeder leads
Connecting lines/ piping
In case the suction line is equipped with a shut-off valve :
uConnect the suction line
lConnect the discharge line
lMake sure that cooling air inlets and outlets are not covered or
obstructed and that the cooling air flow can circulate without
obstruction
Filling up with Oil
The gears and the bearings are oil-lubricated.
In case the pump has been preserved with conservation oil:
uDrain any remaining conservation liquids (see “Maintenance,
Draining the Oil”)
Vacuum pumps are shipped without oil in the gear and bearing
housings.
Installation and Commissioning
Page 7
T1
T3
T2
T4
T6
T5
PTC
T6 T5 T4
T1 T2 T3
L3
L2
L1
L3
L2
L1
T6 T4 T5
T1 T2 T3

CAUTION
The vacuum pump is always shipped without oil.
Operation without oil will destroy the vacuum pump within a very
short period of time.
Prior to commissioning the vacuum pump, make sure that oil is filled
in.
The vacuum pump is delivered without oil (oil specification see “Oil”).
The application of the vacuum pump will determine the oil to be
used.
Dispose of the used oil according to applicable environmental
protection regulations.
NOTE: The quantity of oil given in these operating instructions serves
as a guideline only. Check the oil level with the help of the oil sight
glass (OSG,33/220) on the vacuum pump.
CAUTION
Before changing the oil type, compatibility must be checked and, if
necessary, the pump must be flushed.
CAUTION
In case the vacuum pump has been treated with conservation oil:
Synthetic oils (except for oils based on poly-olefin) are incompatible
with mineral oils and conservation oils.
Risk of foam building leading to the destruction of the vacuum
pump.
CAUTION
Oil may only be filled in through the oil filler holes (OFP,250/260).
Remove oil filler plugs (OFP,250/260) only if the vacuum pump and
the primary pump are at a complete standstill.
The vacuum pump must only be operated with the oil filler plugs
(OFP,250/260) firmly tightened up.
lRemove oil filler plugs (OFP,250/260)
lFill in the relevant quantity of oil as detailed in the table “Oil
Quantity”
lMake sure that the oil level at the gears and bearings is between
the MIN and MAX markings of the oil sight glasses
lMake sure that the seals of the filler plugs (OFP,250/260) are not
damaged and positioned correctly. Replace seals if damaged.
lRefit the oil filler plugs (OFP,250/260)
lSwitch on the vacuum pump
In case the suction line is equipped with a shut-off valve:
uClose the shut-off valve
In case the suction line is not equipped with a shut-off valve:
uCover the suction flange with a rubber plate
lLet the vacuum pump run for a few minutes
lSwitch off the vacuum pump and wait for a few minutes
lMake sure that the oil level at the gears and bearings is between
the MIN and MAX markings of the oil sight glasses
Make sure that the vacuum pump is switched off and cannot
accidentally be switched on again.
uTop-up with oil
In case the suction line is equipped with a shut-off valve:
uOpen the shut-off valve
In case the suction line is not equipped with a shut-off valve:
uRemove the rubber plate from suction flange and connect the
suction line
Saving the Operating Parameters
Make sure that the vacuum pump and the primary pump are switched
off and cannot accidentally be switched on again.
lMeasure the working current of the drive motor and keep it as re-
ference value for all future maintenance and repair work
Recommendations on operation
Application
CAUTION
The vacuum pump is designed for operation under the conditions
described below.
In case of disrespect of the above, risk of damage or destruction of
the vacuum pump and adjacent system components!
Risk of Injury!
The vacuum pump must only be operated under the conditions
described below.
The vacuum pump has been designed for
use in the semiconductor industry under clean room conditions. The
roots pumps can only be used in conjunction with primary pumps in
vacuum systems. They can be used to draw gases and mixtures of
gases.
The end user must make sure that the system complies with national
and international safety regulations and that all safety measures are
followed, when drawing toxic, inflammable and/or explosive gases.
These pumps are not suitable for the drawing of explosive mixture.
Before using the vacuum pump with aggressive gases, imperatively
contact your local Busch Agency.
Do not use the pump for another process without general overhaul, as
gases or products can remain inside the pump.
Make sure that the system is leak-tight and that there is no leakage of
dangerous substances.
If in doubt on drawn process-related liquids, we recommend the
installation of a separator.
Drawing substances with a higher density than air leads to an increased
thermal and mechanical load on the vacuum pump and is permissible
only after consultation with Busch.
Max. allowed temperature of the drawn gas:
See “Oil, Ambient temperature range”
Dispose of the used oil according to applicable environmental
protection regulations.
Max. permissible number of startings per hour: 6.
The vacuum pump is thermally suitable for continuous operation.
The vacuum pump is ultimate pressure-proof.
The pumping of other vapours must be previously approved by the
Busch Company.
CAUTION
During operation the surface of the vacuum pump may exceed tem-
peratures of 70°C.
Risk of burns!
The vacuum pump must be protected against contact during opera-
tion, provide a guard if necessary.
Installation and Commissioning
Page 8

CAUTION
The vacuum pump emits sound of high intensity.
Risk of hearing damage!
Users spending a longer period of time in the vicinity of a non-insu-
lated vacuum pump must wear suitable hearing protection.
lMake sure that the vacuum pump and the primary pump are swit-
ched off and cannot accidentally be switched on again.
lMake sure that protective devices will not be disconnected
lMake sure that cooling air inlets and outlets are not covered or
obstructed and that the cooling air flow can circulate without
obstruction
lMake sure that the “Installation Prerequisites” (see “Installation
Prerequisites and Commissioning”) are followed, particularly follow
those instructions that ensure sufficient cooling
Cooling water
In order to guarantee the flow regulation of the cooling water, it is
recommended to install a regulating valve at the inlet of the cooling
circuit.
To drain the cooling water, the hoses have to be removed and the
cooling water system blown through with compressed air, until all the
water has been completely removed.
Advice: When there is danger of frost, the cooling water must be fully
drained at a standstill of the pump, as described above.
Limitations of use
DP = differential pressure between the outlet and the inlet of the
vacuum pump. See table “Technical Characteristics”. Do not exceed
the values given in the table.
Maintenance
For all maintenance work, the vacuum pump or the vacuum system
must be switched off and it must be ensured that it cannot accidentally
be switched on again.
Any dismantling of the pump must be executed by qualified personnel
only. Before dismantling, the end user of the vacuum pump must fill in
a “Certificate about Absence of Danger” which will inform about
possible risks and dangers and corresponding measures.
Without this document duly filled in and signed by an authorised
person, the pump cannot be dismantled.
CAUTION
During operation, the surface of the vacuum pump may exceed
temperatures of 70°C.
Risk of burns!
lPrior to any work that requires touching the vacuum pump, let the
vacuum pump cool down
When draining the oil:
uLet the vacuum pump cool down for no more than 20 minutes
lPrior to disconnecting the inlet or discharge lines, make sure that
these pipes/ lines have been vented to atmospheric pressure
Maintenance Schedule
NOTE: The maintenance intervals depend very much on the individual
operating conditions. The intervals given below must be considered as
starting values which should be shortened or extended as appropriate.
Particularly heavy duty operation, e.g. high dust loads in the
environment or in the process gases, other contaminations or ingress of
process material, can make it necessary to shorten the maintenance
intervals significantly.
Weekly
lCheck the oil level (see “Checking the oil”)
Monthly:
lMake sure that the vacuum pump and the primary pump are swit-
ched off and cannot be accidentally be switched on again
lCheck the vacuum pump for oil leaks - in case of leaks have the
vacuum pump repaired (Busch service)
In case of operation in a dusty environment:
uMake sure that the working area is free from dust and dirt,
clean if necessary (see “Every 6 Months”)
Every 6 Months:
lDispose of the used oil according to applicable environmental pro-
tection regulations
lDrain the oil in the gears and the bearing housings (see “Draining
the Oil”)
lMake sure that the working area is free from dust and dirt, clean if
necessary
lMake sure that the oil level at the gears and bearings is between
the Min and MAX markings of the oil sight glasses
lThe electrical connection must be checked by qualified personnel
Yearly:
lMake sure that the oil level at the gears and bearings is between
the MIN and MAX markings of the oil sight glasses
Every 16000 Operating hours, at the latest after 4 years
lHave a major overhaul done on the vacuum pump (Busch service)
Checking the oil
Checking the oil level at the gears and bearing
housings
lMake sure that the vacuum pump and the primary pump are swit-
ched off and cannot accidentally be switched on again
lRead the level on the oil sight glasses (OSG,33/220)
In case the level has dropped below the MIN-marking:
uTop up with oil (see “Topping up Oil”)
In case the level is above the MAX-marking:
uChange the oil (see “Change the oil”)
Dispose of the used oil in compliance with applicable environmental
protection regulations.
NOTE: Under normal conditions, there should be no need to top up
with oil during the recommended oil change intervals. A significant
level drop indicates a malfunction (see “Troubleshooting”).
CAUTION
Make sure that the vacuum pump is switched off and cannot acci-
dentally be switched on again
Please fill in the oil after removing the oil filler plugs on the cylinder
covers.
lRemove oil filler plugs
lTop up with oil until the oil level is in the middle of the oil sight
glasses
lPlease ensure that the vacuum pump is shut down and locked
against inadvertent start up
lRefit the oil filler plugs (OFP,250/260)
lMake sure that the oil filler plugs have been correctly fitted after
filling in the oil, so that no air can enter the pump. Too high, an oil
level must be avoided as well as this could lead to overheating of
the gears.
Maintenance
Page 9

Checking the colour of the oil
NOTE: The oil must be clear and transparent. A permanent milky
colour is an indication for contamination by foreign bodies. A dark
colour is an indication for oil that has been chemically altered or
contaminated by foreign bodies.
WARNING
Dark coloured oil may indicate a hazardous pump condition which
could cause personal injury.
If dark oil similar to the example shown is observed, you have to
contact the Busch Customer Service without delay.
Life span of the oil at the gears and the
bearings
The oil life depends very much on the operating conditions. A clean
and dry air stream and operating temperatures below 100°C are ideal.
Under these conditions the oil and the oil filter must be changed every
5000 operating hours, latest after 6 months.
Under very unfavourable operating conditions the oil life can be less
than 500 operating hours. Extremely short life times indicate
malfunctions (see “Troubleshooting”) or unsuitable operating
conditions.
If there is no experience available regarding the oil life under the
prevailing operation conditions, it is recommended to have an oil
analysis carried out every 500 operating hours and establish the oil
change interval accordingly thereafter.
Oil Change
WARNING
Draining used oil from the gears and the
bearings
NOTE: After switching off the vacuum pump at normal operating
temperature, wait no more than 20 minutes before draining the oil.
lMake sure that the vacuum pump and the primary pump are swit-
ched off and cannot accidentally be switched on again
lMake sure that the vacuum pump is vented to atmospheric pres-
sure
lPut a drain tray underneath the oil drain plugs (ODP,252/262)
lRemove the oil drain plugs (ODP,252/262)
lDrain the oil
When the oil flow has stopped:
Make sure that all the used oil is drained
lRefit the magnetic plugs (MP)
lMake sure that the seal of the oil drain plug is not damaged and
fits correctly. Replace seal if damaged
lCheck that no metal swarf sticks to the magnet of the drain plug,
clean or change it if necessary
lRefit the oil drain plugs (ODP,252/262)
lDispose of the used oil in compliance with applicable regulations
CAUTION
Because the ends of the drain plugs are magnetic, metal swarf can
stick to them. Always clean away this swarf when removing the
drain plugs.
Because of wear and tear of the seals, it is recommended to replace
the drain plugs whenever the oil is changed.
lMake sure that the vacuum pump has been vented to atmospheric
pressure
lCarefully unscrew and take off the magnetic plug (MP), which is
situated on the rear lubrication circuit of the motor bearing
lMake sure there is no metallic swarf on the magnetic part of the
magnetic plug, clean off as necessary
lRefit the magnetic plug (MP)
Filling in fresh oil for the gears and the
bearings
lPrepare the necessary oil quantity (see table “Oil quantity”)
NOTE: The quantity given in these operating instructions serves as a
guideline only. Check the oil level with the help of the oil sight glasses
(OSG,33/220) on the vacuum pump.
lMake sure that oil drain plugs (ODP, 252/262) have been correctly
fitted and are tight
CAUTION
Oil may be filled through oil filler holes only (OFP,250/260).
lRemove the oil filler plugs (OFP,250/260)
lMake sure that the seals of the oil filler plugs (OFP, 250/260) are
not damaged, replace if necessary.
lRefit the oil filler plugs (OFP,250/260)
lDispose of the used oil in compliance with applicable regulations
Overhaul
CAUTION
In order to achieve the highest degree of efficiency and a long life
span, the vacuum pump has been assembled and adjusted in accor-
dance with precisely defined tolerances.
This adjustment will be lost during dismantling of the vacuum
pump.
It is therefore highly recommended that any dismantling of the va-
cuum pump going beyond the scope of description in this manual
should be carried out by specially trained Busch service personnel
only.
CAUTION
Risk for the operating safety after improper work on the vacuum
pump.
Risk of explosion!
Approval for operation of the pump will be void!
Any dismantling of the vacuum pump going beyond the scope of
what is described in this manual must be carried out by specially
trained Busch service personnel only.
Maintenance
Page 10

WARNING
In case the vacuum pump has conveyed gases that have been
contaminated with foreign materials that are dangerous to health,
the oil and condensates will also be contaminated.
These foreign materials can infiltrate the pores, recesses and other
internal spaces of the vacuum pump.
Danger to health when the vacuum pump is dismantled.
Danger to the environment.
Prior to shipping, the vacuum pump must imperatively be deconta-
minated and the degree of contamination must be documented in a
declaration of decontamination (“Declaration of Decontamina-
tion”), which can be downloaded from www.buschvacuum.com.
Busch service will only accept vacuum pumps that come with a
completely filled in and legally binding signed form.
Removal from Service
Temporary Removal from Service
lPrior to disconnecting the inlet and discharge lines, as well as the
water piping to and from the motor, make sure that all pipes have
been vented to atmospheric pressure
Recommissioning
After longer periods of standstill:
uMake sure that the vacuum pump and the primary pump are
switched off and cannot accidentally be switched on again
lFollow the instructions in chapter “Installation and Commissio-
ning”
Dismantling and Disposal
WARNING
In case the vacuum pump has conveyed gases that have been
contaminated with harmful foreign material which are harmful to
health, the oil and the condensates will also be contaminated with
harmful foreign material.
These foreign materials can infiltrate the pores, recesses and other
internal spaces of the vacuum pump.
Danger to health during dismantling of the vacuum pump.
Danger to the environment.
During dismantling of the vacuum pump protective equipment and
clothing must be worn.
The vacuum pump must be decontaminated prior to disposal.
Prior to shipping, the vacuum pump must imperatively be deconta-
minated and the degree of contamination must be documented in a
declaration of decontamination (“Declaration of Decontamina-
tion”), which can be downloaded from www.buschvacuum.com.
Used oil and condensates must be disposed of separately in com-
pliance with applicable environmental regulations.
lDrain the oil
uDispose of the used oil in compliance with applicable regula-
tions
lMake sure that all materials and components that must be treated
as special waste have been removed from the vacuum pump
lMake sure that the vacuum pump is not contaminated with any
harmful foreign material
Based on what is known at the time of print of this manual, the
materials used for the manufacturing of the vacuum pump involve no
risk.
lPlease dispose of used parts and fluids in accordance with local
applicable environmental laws and regulations
lDispose of the vacuum pump as scrap metal
Removal from Service
Page 11

Spare parts
NOTE: When ordering spare parts or accessories acc. to the table
below please always quote the type and the serial no. of the vacuum
pump (on the name plate of the pump). This will allow Busch service
technicians to check if the vacuum pump is compatible with a modified
or improved part.
The exclusive use of genuine spare parts and consumables is a
prerequisite for the proper function of the vacuum pump and for the
granting of warranty, guarantee or goodwill.
This parts list applies to a standard configuration of the vacuum pump.
Specific pump configuration parts lists can be supplied upon request.
Gasket kit
The gasket kits contain all the seals to be changed during service work
on a vacuum pump.
Part number : 0990 568 226
Pos. Part Qty WY 0500 C-
WY 1250 C
3 O-ring 4 0486 000 647
9 O-ring 2 0486 512 503
11 O-ring 2 0486 000 755
73 O-ring 4 0486 000 704
106 O-ring 1 0486 517 557
221 O-ring 1 0486 521 581
223 O-ring 1 0486 000 633
523 O-ring 1 0486 543 360
523 O-ring 1 0486 566 140
525 O-ring 1 0486 566 141
Part number : 0990 566 731
Pos. Part Qty WY 2000 C
3 O-ring 4 0486 000 647
9 O-ring 2 0486 515 882
11 O-ring 2 0486 000 751
73 O-ring 4 0486 000 601
106 O-ring 1 0486 517 557
221 O-ring 1 0486 521 581
223 O-ring 1 0486 000 633
240 Screw plug 1 0415 000 075
246 Screw plug 1 0415 000 075
250 Screw plug 1 0415 000 074
260 Screw plug 1 0415 000 074
523 O-ring 2 0486 566 140
525 O-ring 1 0486 566 141
- Screw plug 2 0415 000 075
Full service kit
These full service kits contain all relevant gasket kits as well as the wear
and tear parts that need to be changed.
Part number : 0994 568 225
Pos. Part Qty WY 0500 C-
WY 1250 C
4 Parallel pin 6 0437 565 182
13 Piston ring 16 0488 000 301
15 Grooved ball bearing 4 0473 571 131
19 Compensation washer 2 0433 508 767
22 Adjusting washer 2 0433 509 251
22 Adjusting washer 2 0433 509 250
22 Tolerance washer 2 0433 534 091
22 Adjusting washer 2 0433 541 572
101 Gear 1 0512 000 103
252 Screw plug with magnet 1 0415 569 030
262 Screw plug with magnet 1 0415 569 030
520 Grooved ball bearing 2 0473 558 817
522 Compensation washer 1 0433 508 933
- Gasket kit 1 0990 568 226
Part number : 0994 566 730
Pos. Part Qty WY 2000 C
4 Parallel pin 6 0437 562 525
13 Piston ring 16 0488 000 303
15 Grooved ball bearing 4 0473 509 262
19 Compensation washer 2 0433509261
22 Adjusting washer 2 0433 509 263
22 Tolerance washer 2 0433 511 323
22 Adjusting washer 2 0433 509 264
101 Gear 1 0512 000 103
252 Screw plug with magnet 1 0415556030
262 Screw plug with magnet 1 0415556030
522 Compensation washer 1 0433 508 933
- Gasket kit 1 0990 566 731
Spare parts
Page 12

Oil
Oil type
CAUTION
It is possible that the vacum pump was tested with a different type of oil to the type you will be using for your application. Vacuum pumps that
have been tested with a special oil, are labelled with specific stickers ("Special oil") affixed on the B-side cover (inlet side) as well as on the A-side
cover (motor-side). If the oil type is not compatible, all parts that have come into contact with the oil must be cleaned. Make sure that the bea-
rings are lubricated prior to reassembly.
lMake sure that the oil type corresponds to specifications:
–BUSCH YLC 250 B, n° art. 0831000054 (0,5l @1 kg)
WARNING
The use of chemically contaminated or polluted oil can lead to hazardous pump conditions which could cause personal injury.
Description BUSCH YLC 250 B
ISO-VG 100
Base PFPE
Density [g/cm3] 1,9
Ambient temperature range -
Kinematic viscosity at 40°C [mm2/s] 89
Kinematic viscosity at 100°C [mm2/s] 12
Flashpoint [°C] -
Solidifying point [°C] - 35
Part no. ~ 2,5 l V831514524
Note
Quantity of oil [l] Motor side Gear side
WY 0500 C -
WY 1250 C 0,6 0,8
WY 2000 C 1,2 1,5
Oil
Page 13

Technical Data
Technical Properties WY 0500 C WY 0700 C WY 1250 C WY 2000 C
Nominal displacement 50 (60) Hz m3/h 500 (600) 700 (840) 1250 (1500) 2000 (2400)
Max. differential pressure hPa (mbar) 50 50 50 50
Nominal motor rating 50 (60) Hz kW 4 (4,4) 4 (4,4) 4 (4,4) 5,5 (6,6)
Nominal motor speed 50 (60) Hz min-1 2840 (3380) 2840 (3380) 2840 (3380) 2870 (3440)
Weight approx. kg 139 140 193 273
Technical Data
Page 14

Troubleshooting
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be carried out by qualified personnel that know and observe the following regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or equivalent national accident prevention regulations.
CAUTION
During operation, the surface of the vacuum pump may exceed temperatures of 70°C.
Risk of burns!
Do not touch the hot surfaces of the vacuum pump or wear heat protection gloves.
Please contact your local Busch representative if you have any doubts or questions.
Problem Possible Cause Remedy
The vacuum pump does not reach the usual
working pressure
The vacuum system or suction line are not
leak-tight
Check piping, hoses or pipe connections for
possible leaks
The current consumption of the motor is too
high (compared with the initial value after
commissioning)
Jammed lobes
Defective bearings
Inspection of the lobes
Have the vacuum pump repaired (Busch
service)
Reaching operational pressure takes too long In case an inlet filter is installed on the suction
side: The filter on the suction flange is partial-
ly clogged
Clean or change the filter
Partial clogging or blockage in suction or
discharge lines
Remove foreign particles
Suction or discharge lines too long, or too
small (diameter)
Use larger diameter lines
Internal parts worn or damaged Have the vacuum pump repaired (Busch
service)
The vacuum pump runs in the wrong
direction
Check rotation of the driving motor. See
“Installation and Commissioning”, change if
necessary
The vacuum pump does not start The drive motor is not supplied with the
correct voltage or is overloaded
Supply the drive motor with the correct vol-
tage
The drive motor trip switch protection is too
weak or trip level is too low
Compare the technical data of drive motor
trip switch with the data on the nameplate of
the motor.
Correct if necessary
In case of high ambient temperature:
Set the trip level of the drive motor trip
switch 5% above the nominal drive motor
current
One of the fuses has blown Check the fuses
The connection cable is too long or too small
causing a voltage drop at the vacuum pump
Use adequately dimensioned cable
The vacuum pump or the drive motor is jam-
med or seized
If the unit vacuum pump/ drive motor is still
jammed:
Remove the drive motor and check the drive
motor and the vacuum pump separately
If the vacuum pump is jammed:
Have the vacuum pump repaired (Busch
service)
Troubleshooting
Page 15

The drive motor is defective Change the drive motor (Busch service)
The vacuum pump is jammed or seized Solid foreign matter has entered the vacuum
pump
Have the vacuum pump repaired (Busch
service)
Make sure the suction line is equipped with a
mesh screen
If necessary fit a mesh screen at the inlet
Corrosion in the vacuum pump from
remaining condensates
Have the vacuum pump repaired (Busch
service)
Check the process
Follow the instructions in chapter “Installation
and Commissioning, Operating Notes”
The vacuum pump starts, but labours or runs
noisily or rattles
The drive motor draws too high a current
(compare with initial value after commissio-
ning)
Connection(s) in the drive motor terminal box
are defective
The motor winding is defective
The drive motor operates on two phases only
Check the proper connection of the wires
against the wiring diagram
Tighten or change the connections
Wrong oil quantity, unsuitable oil type Use one of the recommended oils in the cor-
rect quantity
(see “Oil”, Oil change see “Maintenance”)
Foreign particles in the vacuum pump
Seized bearings
Have the vacuum pump repaired (Busch
service)
The vacuum pump is very noisy Defective bearings Have the vacuum pump repaired (Busch
service)
Worn coupling element Replace the coupling elements
Defective gears Have the vacuum pump repaired (Busch
service)
Noise at the sealings Insufficient lubrication Check oil levels and top up with oil
Worn sealing (wear parts) Change sealing
The vacuum pump is very hot
(the temperature of the drained oil must not
exceed 90°C)
Cooling water flow is too low (only WY 2000) Check the cooling water circuit and adjust the
flow if necessary
Ambient temperature too high Keep within the permitted ambient tempera-
ture range
Temperature of the gases at inlet too high Keep within the permitted temperature range
for the gases at inlet
Mains frequency or voltage outside tolerance
range
Provide a more stable power supply
The oil is black Oil change intervals are too long
The oil has overheated
Drain the oil
Fill in new oil
(see “Maintenance”)
In case the oil life is too short : use oil with
better heat resistance (see “Oil”) or fit addi-
tional cooling
The rotors do not turn, and cannot be turned
either way by hand:
Failure of the motor Repair or change motor
The rotors do not turn, and cannot be turned
by hand either way:
Rotors are jammed, stuck or seized Free the rotors
Check for signs of overheating (discoloura-
tion) and contact Busch Service for a
service/dismantling for repair
Foreign substances in the pump Dismantle pump to clean and repair
Abnormal sounds or vibrations:
STOP BLOWER IMMEDIATELY !!
Excessive wear of bearings Change bearings
Troubleshooting
Page 16

Too little gear oil in the pump, or oil in the
pump is worn
Top up with oil/Change gear oil
Resonance of piping Provide support for the piping or use flexible
connections
**Abnormal increase of discharge pressure Refer to cause marked with **
Leakage Find and stop leaks
Synchronising the rotors Have the vacuum pump repaired (Busch
service)
Foreign particles in the gear housing Have the vacuum pump repaired (Busch
service)
Failure of non-return valve Change non-return valve
Abnormal heat Abnormal increase of discharge pressure Refer to causes marked with **
Rotational speed of blower and/ or motor too
low (when using a frequency converter)
Check the minimal admissible rotational speed
and correct
Too much gear oil in the housing Fill in oil only to the middle of the oil sight
glass, while the blower is switched off
Ambient temperature too high Increase ventilation of the machine room/in-
crease rotational speed (ventilation) of motor
Blockage of the suction inlet or filter Clean suction inlet, and clean or change filter
Excessive wear of rotors and consequently
increase of rotor tolerances
Install filter and dismantle blower for repair
Have the vacuum pump repaired (Busch
service)
**Abnormal increase of discharge pressure Blockage of discharge pipe Clean discharge pipe
Blockage of system piping Clean system piping
Primary pump failure Have the vacuum pump repaired (Busch
service)
Oil leaks Too much oil in the pump Fill up oil only to the middle of the oil sight
glass, while the blower is switched off
Worn sealing Change sealing
Ambient conditions and vacuum combined
with pressure operation and high dP
Fit an oil separator, ensure adequate ventila-
tion
Pump has been tilted or is not level Install the pump on a horizontal surface
Oil level in the seal housing fluctuates abnor-
mally (drop oiler)
Worn sealing Change sealing
Troubleshooting
Page 17

EU-Declaration of Conformity
This Declaration of Conformity and the CE-mark affixed to the nameplate are valid for the machine within the Busch scope of delivery. This
declaration of Conformity is issued under the sole responsibility of the manufacturer. When this machine is integrated into a superordinate
machinery the manufacturer of the superordinate machinery (this can be the operating company, too) must conduct the conformity assessment
process for the superordinate machine or plant, issue the Declaration of Conformity for it and affix the CE-mark.
The manufacturer: Ateliers Busch S.A.
Zone Industrielle
CH-2906 Chevenez
declare that the machine(s) WY 0500-2000 C
has (have) been manufactured in accordance with the European Directives:
–“Machinery” 2006/42/EC
–“Electromagnetic Compatibility” 2014/30/EU
–“RoHS 2” 2011/65/EU, 2017/2102, restriction of the use of certain hazardous substances in electrical and electronic equipment
and following the standards:
Standard Title of the standard
EN ISO 12100:2010 Safety of machinery - Basic concepts, general principles of design
EN ISO 13857:2008 Safety of machinery - Safety distances to prevent hazard zones being reached by the upper and lower limbs
EN 1012-1:2010
EN 1012-2:1996 + A1:2009
Compressors and vacuum pumps - Safety requirements - Part 1 and 2
EN ISO 2151:2008 Acoustics - Noise test code for compressors and vacuum pumps - Engineering method (grade 2)
EN 60204-1:2006 Safety of machinery - Electrical equipment of machines - Part 1: General requirements
EN 61000-6-2:2005 Electromagnetic compatibility (EMC) – Generic standards. Immunity for industrial environments; Part 1 and 3
EN 61000-6-4:2007 +
A1:2011
Electromagnetic compatibility (EMC) – Generic standards. Emission standard for industrial environments
EN ISO 13849-1:2015 (1) Safety of machinery - Safety-related parts of control systems - Part 1: General principles for design and 2
Person authorised to compile the technical file: Gerd Rohweder
Busch Dienste GmbH
Schauinslandstr. 1
DE-79689 Maulburg
Chevenez, 08.10.2018
Christian Hoffmann, General Director
(1) In case control systems are integrated.