BUSCH COBRA NC 0600 C User manual

Instruction Manual
COBRA ATEX
Dry Screw Vacuum Pumps
NC 0600 C (water-cooled version)
NC 0630 C (water-cooled version)
0870201731/-0003_en / Original instructions / Modifications reserved 14/05/2018
Ateliers Busch S.A.
Zone industrielle, 2906 Chevenez
Switzerland

Table of Contents
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Table of Contents
1 Safety........................................................................................................................... 4
2 Product Description ..................................................................................................... 5
2.1 Operating Principle............................................................................................... 7
2.2 Application ........................................................................................................... 7
2.3 Standard Features................................................................................................. 8
2.3.1 Water Cooling ...........................................................................................8
2.3.2 Thermometer.............................................................................................8
2.3.3 Sealing Systems .........................................................................................8
2.3.4 Barrier Gas System.....................................................................................8
2.3.5 Nitrogen Panel...........................................................................................8
2.4 Accessories ........................................................................................................... 8
2.4.1 Gas Ballast Valve........................................................................................9
2.4.2 Silencer......................................................................................................9
2.4.3 Resistance Thermometer............................................................................9
2.4.4 Pressure Transmitter ..................................................................................9
2.4.5 Pressure Switch..........................................................................................9
2.4.6 Vibration Analysis System ..........................................................................9
2.4.7 Mechanical Seals........................................................................................9
2.4.8 Liquid Flushing Device ...............................................................................9
2.4.9 Terminal box..............................................................................................10
2.5 Explanation of ATEX Classification ........................................................................10
2.5.1 ATEX Nameplate........................................................................................10
2.6 Safety concept...................................................................................................... 10
2.6.1 ATEX Classifications and Associated Accessories ........................................11
2.6.2 P&ID "Piping and Instrumentation Diagram" ............................................12
3 Transport ..................................................................................................................... 14
4 Storage......................................................................................................................... 14
5 Installation................................................................................................................... 15
5.1 Installation Conditions .......................................................................................... 15
5.2 Connecting Lines / Pipes ......................................................................................16
5.2.1 Suction Connection....................................................................................16
5.2.2 Discharge Connection................................................................................16
5.2.3 Cooling Water Connection ........................................................................17
5.2.4 Barrier Gas System Connection ..................................................................18
5.2.5 Dilution Gas System Connection (Optional)...............................................19
5.2.6 Purge Gas System Connection ...................................................................20
5.3 Earth Connection.................................................................................................. 21
5.4 Filling Oil..............................................................................................................21
5.5 Filling Cooling Liquid ............................................................................................ 23
5.6 Liquid Flushing Device Installation (Optional) ....................................................... 24
5.7 Fitting the Coupling.............................................................................................. 24
5.8 Electrical Connection ............................................................................................25
5.8.1 Wiring Diagram Three-Phase Motor (Pump Drive).....................................26
5.8.2 Wiring Diagram Solenoid Valve .................................................................27
5.9 Electrical Connection of the Monitoring Devices ................................................... 27
5.9.1 Wiring Diagram Resistance Thermometer ..................................................28
5.9.2 Wiring Diagram Pressure Switch ................................................................28
5.9.3 Wiring Diagram Pressure Transmitter.........................................................29
5.9.4 Wiring Diagram Vibration Sensor...............................................................29
5.9.5 Wiring Diagram Flow Switch......................................................................30
5.9.6 Wiring Diagram Level Switch.....................................................................30

Table of Contents
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 3
5.10 Flowchart .............................................................................................................31
6 Commissioning............................................................................................................ 32
6.1 Conveying Condensable Vapours ......................................................................... 33
6.2 Liquid Flushing Procedure..................................................................................... 33
6.3 Gas Purging Procedure ......................................................................................... 34
7 Maintenance................................................................................................................ 34
7.1 Maintenance Schedule.......................................................................................... 35
7.2 Oil Level Inspection .............................................................................................. 35
7.3 Cooling Liquid Level Inspection ............................................................................36
7.4 Replacing the Gas Ballast Filter (Optional) ............................................................ 36
7.5 Oil Change...........................................................................................................36
7.6 Cooling Liquid Change ......................................................................................... 39
7.7 Calibration Procedure of the Electrical Devices ..................................................... 40
7.7.1 Procedure B ...............................................................................................40
7.7.2 Procedure E ...............................................................................................40
7.7.3 Procedure G...............................................................................................40
7.7.4 Procedure H...............................................................................................40
8 Overhaul...................................................................................................................... 41
9 Decommissioning ........................................................................................................ 41
9.1 Dismantling and Disposal...................................................................................... 41
10 Spare Parts................................................................................................................... 43
11 Troubleshooting........................................................................................................... 43
12 Technical Data ............................................................................................................. 45
13 Cooling Liquid ............................................................................................................. 45
14 Oil ............................................................................................................................... 45
15 EU Declaration of Conformity...................................................................................... 46

1 | Safety
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1 Safety
Prior to handling the machine, this instruction manual should be read and understood. If
anything needs to be clarified, please contact your Busch representative.
Read this manual carefully before use and keep for future reference.
This instruction manual remains valid as long as the customer does not change anything
on the product.
The machine is intended for industrial use. It must be handled only by technically trained
personnel.
Always wear appropriate personal protective equipment in accordance with the local
regulations.
The machine has been designed and manufactured according to state-of-the-art meth-
ods. Nevertheless, residual risks may remain. This instruction manual highlights potential
hazards where appropriate. Safety notes and warning messages are tagged with one of
the keywords DANGER, WARNING, CAUTION, NOTICE and NOTE as follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if
not prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and
trouble-free operation.

Product Description | 2
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2 Product Description
NC 0600 C ATEX 2G(i/o) (only the obligatory accessories are illustrated)
IN, IS
CWI
OFPSV
CWOODP, MP
CLF EB OFP
TM
ODP
PHEOSG
CLV
OSG
MP
MTB
CLP
CLD
MV2
FME,
FS-/0501*
PRV
MAN BGC,
PGC
TSA+/0102
MV4
MAN FME
TSA+/0103PSA or PS+
/0301
EB
OUT
PMR
SA+/0701
* recommended NP1NP2
BGC Barrier gas connection CD Condensate drain
CLD Cooling liquid drain valve CLF Cooling liquid fill plug
CLP Cooling liquid pump CLV Cooling liquid vent plug
CWI Cooling water inlet CWO Cooling water outlet
EB Eye bolt FME Flow meter
FS Flow switch IN Suction connection
IS Inlet screen MAN Manometer
MP Magnetic plug MTB Motor terminal box
MV Solenoid valve NP Nameplate
ODP Oil drain plug OFP Oil fill plug
OSG Oil sight glass OUT Discharge connection
PGC Purge gas connection PHE Plate heat exchanger
PMR Plug for manual rotation of rotors PRV Pressure regulating valve
PS/PSA Pressure switch/transmitter SA Vibration transmitter
SV Safety valve TM Thermometer
TSA Temperature transmitter

2 | Product Description
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NC 0630 C ATEX 3G(i/o) (only the obligatory accessories are illustrated)
EB IN
OUT
PMR
CWI
SI
OFPSV
CWOODP, MP
OUT
CLF EB OFP
CD
TM ODP
PHEOSG
CLV
DA
OSG
MP
MTB GB
CLP
CLD
MV2FME
PRVMAN BGC
TSA+/0102
NC 0630 C with silencer and
gas ballast valve (Options)
NP1NP2
BGC Barrier gas connection CD Condensate drain
CLD Cooling liquid drain valve CLF Cooling liquid fill plug
CLP Cooling liquid pump CLV Cooling liquid vent plug
CWI Cooling water inlet CWO Cooling water outlet
EB Eye bolt FME Flow meter
GB Gas ballast valve IN Suction connection
MAN Manometer MP Magnetic plug
MTB Motor terminal box MV Solenoid valve
NP Nameplate ODP Oil drain plug
OFP Oil fill plug OSG Oil sight glass
OUT Discharge connection PHE Plate heat exchanger
PMR Plug for manual rotation of rotors PRV Pressure regulating valve
SI Silencer SV Safety valve
TM Thermometer TSA Temperature transmitter

Product Description | 2
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 7 / 48
NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum
pump’.
2.1 Operating Principle
The machine works on the one-stage, twin-screw pump principle.
Two screw rotors are rotating inside the cylinder. The pumping medium is trapped
between the individual screw coils, compressed and transported to the gas discharge.
During the compression process, the two screw rotors do not come into contact with
each other nor with the cylinder. There is no need for a lubrication or an operating fluid
in the process chamber.
2.2 Application
The machine is intended for the suction of air and other dry, non-aggressive and non-
toxic gases.
Explosive gases and vapour mixtures can be drawn in according to the scope of the Dir-
ective ATEX 2014/34/EU.
Depending on the equipment, the machine is intended for suction of explosive gases ac-
cording to the data given on the nameplate of the machine (NP), see Explanation of
ATEX Classification [►10].
Conveying of other media leads to an increased thermal and/or mechanical load on the
machine and is permissible only after a consultation with Busch.
The machine is intended for the placement in a potentially explosive environment ac-
cording to the data given on the nameplate of the motor and the nameplate of the ma-
chine (NP), see Explanation of ATEX Classification [►10].
In case Busch delivered the machine without motor and coupling, the following must be
observed:
• In regards to its explosive atmosphere protection class, the motor and the coup-
ling must have at least the same ATEX classification as the machine for the outside
area “Outside (o)”.
• The motor and the coupling do not require an ATEX certification when the ma-
chine ATEX classification corresponds to “Outside (o) No ATEX zone”.
The machine is capable of maintaining ultimate pressure, see Technical Data [►45].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►45].

2 | Product Description
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2.3 Standard Features
2.3.1 Water Cooling
The machine is cooled by a cooling liquid circuit in the cylinder cover and cylinder.
The cooling liquid pump (CLP) allows a recirculating flow in the cooling liquid chamber.
The cooling liquid is cooled by a plate heat exchanger (PHE) which must be connected to
the water main.
2.3.2 Thermometer
The thermometer allows a visual display of the cooling liquid temperature.
2.3.3 Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
Other sealing systems are optionally available, see Mechanical Seals [►9].
Sealing systems prevent the process gas going to the bearings chambers.
Depending on the application, the sealing systems efficiency can be improved with a
barrier gas system, see Barrier Gas System [►8].
2.3.4 Barrier Gas System
The barrier gas system allows the supply of compressed air or nitrogen into the motor
side shaft seals in order to improve the sealing efficiency.
2.3.5 Nitrogen Panel
The nitrogen panel fitted to the base frame allows the supply of nitrogen to a number of
different points on the machine.
Each device consists of a solenoid valve to open or close the gas circuit, a pressure regu-
lator and a flow meter to adjust pressure and volume flow separately.
The following devices are available:
– The barrier gas system for sealing systems on motor side. This device is equipped
with a flow switch integrated to the flow meter to switch off the machine if the ni-
trogen volume flow drops below the minimum set flow value.
– The dilution gas ballast prevents the formation of condensates or dilutes them, de-
pending on the application. The nitrogen is fed into the cylinder.
– The purge gas system fitted at the inlet flange allows to flush the machine after use
or during operation. The nitrogen is fed into the inlet flange.
2.4 Accessories
NOTE
Depending on the ATEX classification of the machine, some of the following accessories
may be mandatory, see ATEX Classifications and Associated Accessories [►11].

Product Description | 2
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 9 / 48
2.4.1 Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to
counteract the condensation of vapour inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Tech-
nical Data [►45].
A ball valve enables to open or close the gas ballast flow.
2.4.2 Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas
noise.
2.4.3 Resistance Thermometer
The resistance thermometer monitors the cooling liquid temperature. A second resistance
thermometer might be installed to monitor the exhaust gas temperature.
Warning and trip signals must be set, see Wiring Diagram Resistance Thermometer
[►28].
2.4.4 Pressure Transmitter
The pressure transmitter monitors the gas pressure at the discharge connection (OUT).
Warning and trip signals must be set, see Wiring Diagram Pressure Transmitter [►29].
2.4.5 Pressure Switch
The pressure switch monitors the gas pressure at the discharge connection (OUT). It can
be installed instead of the pressure transmitter.
The machine must be stopped when the gas reaches a certain pressure, see Wiring Dia-
gram Pressure Switch [►28].
2.4.6 Vibration Analysis System
The vibration analysis system monitors the correct mechanical operation of the machine.
This unit is composed of a vibration sensor (SA) and a transmitter (delivered loose).
The machine must be stopped when the vibration limit value (preset at the factory) is
reached, see Wiring Diagram Vibration Sensor [►29].
2.4.7 Mechanical Seals
The sealing systems can be equipped with mechanical seals. The following variants are
possible:
– Oil lubricated single mechanical seals on the motor side and labyrinth seals on the
suction side.
– Oil lubricated single mechanical seals on the motor side and suction side.
2.4.8 Liquid Flushing Device
The liquid flushing device allows the machine to be flushed with the appropriate liquid
according to the process type. The system consists of a solenoid valve which enables to
open and close the flushing liquid circuit.

2 | Product Description
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Furthermore, two level switches (LS-/0201 and LS-/0202) monitor the flushing liquid
quantity.
Upper level switch (LS-/0201) ► Lalarm) Early warning
Lower level switch (LS-/0202) ► Ltrip) Trip, the flushing must be stopped
2.4.9 Terminal box
The machine can be optionally equipped with a terminal box. All electrical devices, ex-
cept the motor, are already wired to the terminal box.
2.5 Explanation of ATEX Classification
The ATEX classification is written on the nameplate of the machine (NP), see below a
marking example:
Inside (i)
Outside (o)
II 2G IIB T3 X
II 2G IIB T3 X
Explosion group inside the machine
Equipment category for explosive gases inside the machine
Equipment category for gas and dust outside the machine
Equipment group II (not for mining application)
Explosion protection inside the machine
Explosion protection outside the machine
Design approved according to ATEX Directive
Equipment group II (not for mining application)
Temperature class inside the machine (T3=200°C)
Special conditions for operation*
Special conditions for operation*
Temperature class outside the machine
Explosion group outside the machine
* The specific operating conditions are determined in this instruction manual.
2.5.1 ATEX Nameplate
The machine has two different nameplates:
– A nameplate (NP1) is fixed on the base frame of the machine with the ATEX marking
inscription.
– A second nameplate (NP2) is fixed on the machine stage (module) identifying that
the stage is suitable for ATEX certified machine.
This allows the preservation of the machine ATEX certification if the machine stage
should be replaced.
2.6 Safety concept
WARNING
Misinterpretation of the ATEX instructions.
Risk of severe injury!
Risk of explosion!
• Make sure that the recommendations described in this manual correspond to the
ATEX marking written on the nameplate (NP).
• If anything needs to be clarified, please contact your Busch representative.
The safety concept is based on the prevention of sparks and excessive temperatures by
means of various accessories.

Product Description | 2
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 11 / 48
The monitoring devices must be integrated into the system control such that operation
of the machine will be inhibited if the safety limit values are exceeded. The limit values of
each accessory are defined in the wiring diagram chapters, see Electrical Connection of
the Monitoring Devices [►27].
To have more details about the monitoring procedure, see Flowchart [►31].
2.6.1 ATEX Classifications and Associated Accessories
The following table defines the obligatory accessories depending on the ATEX classifica-
tion.
(i) II 2G IIB T3 X
(o) II 2G IIB T3 X
TSA+
/0102
PSA+/0301
ATEX
MOT IIC
ATEX
CPL ECP
X X
X
X
X
X
XX
X
X
XX
XX
A
B
C
D
TSA+
/0103
ATEX
MOT IIB
(i) II 2G IIB T3 X
(o) II 2G IIC T3 X
(i) II 3G IIC T2, T3* X
(o) II 3G IIB T3 X
(i) II 3G IIC T2, T3* X
(o) II 3G IIC T3 X
X
X
X
SA+
/0701
X
X
X
X
X
MV
MV4
MV4
MV2
MV2
FS-
/0501
(X)**
(X)**
PS+/0301
(MV2)**
(MV2)**
XX
(i) II 2G IIB T3 X
(o) No ATEX zone
X X MV2
(i) II 3G IIB T2, T3* X
(o) No ATEX zone
E
F
XX(X)** XMV4
(MV2)**
IS
X X
(i) II 2G IIC T3 X
(o)
II 2G IIC T3 X
GXXXX MV4
(X)**
(MV2)**
X X
(X)**
(X)**
(X)**
(X)**
(X)**
ATEX classification
** recommended
* temperature class: T2 for NC 0630 C and T3 for NC 0600 C
CPL Coupling ECP Pump earth connection
FS Flow switch IS Inlet screen
MOT Motor (IIB or IIC) MV Solenoid valve
PSA Pressure transmitter PS Pressure switch
SA Vibration transmitter TSA Resistance thermometer

2 | Product Description
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2.6.2 P&ID "Piping and Instrumentation Diagram"
TSA+
0102
MV6
0201
LS-
0202
LS-
SA+
0701
MV4
MV2
MV5
FS-
0501
FME
FME
PRV
PRV
FME PRV
FS-
0503
FS-
0504
FLV
NRV
NRV
NIF
SI
M
CPL MOT
TSA+
0103
PSA+
0301
PS+
0301
CWO
CWI
MV7
PHE
CLP
TTV
55°C
NRV
GB
MAN
MAN
MAN
IS
Barrier gas system
Purge gas system
Dilution gas system
= optional
Flushing liquid device
Air
or
IN
OUT
DN100 ISO-K
DN100 PN16
DN100 ISO-K
DN100 PN16
GC G1/4
G1/2
G1/2
Obligatory for
classification :
(i) II 2G IIC T3 X
(o) II 2G IIC T3 X
or
P&ID for classification A , B , C and G
= optional
Barrier gas system
Purge gas system
Dilution gas system
Flushing liquid device
Air
Obligatory for
classification G
CLP Cooling liquid pump CPL Coupling
CWI Cooling water inlet CWO Cooling water outlet
FLV Flushing liquid vessel FME Flow meter
FS Flow switch GB Gas ballast valve
GC Gas connection IN Suction connection
IS Inlet screen LS Level switch
MAN Manometer MOT Motor
MV Solenoid valve NIF Nitrogen inlet filter
NRV Non-return valve OUT Discharge connection
PHE Plate heat exchanger PSA Pressure transmitter
PS Pressure switch SA Vibration transmitter
SI Silencer TSA Resistance thermometer
TTV Three-way thermostatic valve

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0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 13 / 48
M
TSA+
0102
MV6
0201
LS-
0202
LS-
SA+
0701
MV4
MV2
MV5
FS-
0501
FME
FME
FME
FS-
0503
FS-
0504
FLV
NRV
NRV
GC
NIF
MAN
IN
OUT
CPL MOT
TSA+
0103
PSA+
0301
PS+
0301
GB
CWO
CWI
MV7
PHE
CLP
TTV
55°C
SI
NRV
MAN
MAN
IS
PRV
PRV
PRV
Barrier gas system
Purge gas system
Dilution gas system
= optional
Flushing liquid device
Air
or
G1/4
G1/2
G1/2
DN100 ISO-K
DN100 PN16
DN100 ISO-K
DN100 PN16
or
P&ID for classification D , E and F
= optional
Barrier gas system
Purge gas system
Dilution gas system
Flushing liquid device
Air
CLP Cooling liquid pump CPL Coupling
CWI Cooling water inlet CWO Cooling water outlet
FLV Flushing liquid vessel FME Flow meter
FS Flow switch GB Gas ballast valve
GC Gas connection IN Suction connection
IS Inlet screen LS Level switch
MAN Manometer MOT Motor
MV Solenoid valve NIF Nitrogen inlet filter
NRV Non-return valve OUT Discharge connection
PHE Plate heat exchanger PSA Pressure transmitter
PS Pressure switch SA Vibration transmitter
SI Silencer TSA Resistance thermometer
TTV Three-way thermostatic valve

3 | Transport
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3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
NOTICE
In case the machine is already filled with oil.
Tilting a machine that is already filled with oil can cause large quantities of oil to in-
gress into the cylinder.
• Drain the oil prior to every transport or always horizontally transport the machine.
• Make sure that the eyebolt (EB) is in faultless condition, fully screwed in and tightened
by hand.
Machine weight:
see the technical data or the nameplate (NP)
WARNING
Lifting the machine using the motor eye bolt.
Risk of severe injury!
• Do not lift the machine using the eye bolt fitted to the motor. Only lift the machine as
previously shown.
• Check the machine for transport damage.
If the machine is secured to a base plate:
• Remove the machine from the base plate.
4 Storage
• Seal all apertures with adhesive tape or reuse provided caps.
If the machine is to be stored for more than 3 months:
• Wrap the machine in a corrosion inhibiting film.
• Store the machine indoors, dry, dust free and if possible in original packaging
preferably at temperatures between 5 ... 55 °C.

Installation | 5
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 15 / 48
5 Installation
5.1 Installation Conditions
WARNING
The installation conditions are not respected in an ATEX environment.
Risk of severe injury!
Risk of explosion!
• Take care that the installation conditions are fully complied with.
NOTICE
Use of the machine outside of the permitted installation conditions.
Risk of premature failure!
Loss of efficiency!
• Take care that the installation conditions are fully complied with.
• Make sure that the environment of the machine complies with the ATEX classification
of the machine according to the data given on the nameplate of the motor and the
nameplate of the machine (NP).
• Make sure that the ambient conditions comply with the Technical Data [►45].
• Make sure that the environmental conditions comply with the protection class of the
motor.
• Make sure that the installation space or location is vented such that sufficient cooling
of the machine is provided.
• Make sure that cooling air inlets and outlets of the motor fan are not covered or ob-
structed and that the cooling air flow is not affected adversely in any other way.
• Make sure that the oil sight glass (OSG) remains easily visible.
• Make sure that enough space remains for maintenance work.
• Make sure that the machine is placed or mounted horizontally, a maximum of 1° in
any direction.
• Check the oil level, see Oil Level Inspection [►35].
• Check the cooling liquid level, fill up if necessary, see Filling Cooling Liquid [►23].
• Make sure that the cooling water complies with the requirements, see Cooling Water
Connection [►17].
If the machine is installed at an altitude greater than 1000 meters above sea level:
• Contact your Busch representative, the motor should be derated or the ambient
temperature limited.
If additional electrical components not included in scope of delivery should be added:
• Make sure that they have a better or equal ATEX classification than that of the
machine, see the ATEX marking on the nameplate (NP).
For classification type “C” and "F" (see ATEX Classifications and Associated Accessories
[►11]):
• Make sure that the installation space or location is ventilated enough in order to
prevent the formation of an explosive area.

5 | Installation
16 / 48 0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en
5.2 Connecting Lines / Pipes
• Remove all protective caps before installation.
• Make sure that the connections are gas tight.
• Make sure that the connection lines cause no stress on the machine‘s connection; if
necessary use flexible joints.
• Make sure that the line size of the connection lines over the entire length is at least as
large as the connections of the machine.
In case of very long connection lines it is advisable to use larger line sizes in order to
avoid a loss of efficiency. Seek advice from your Busch representative.
WARNING
The connection lines can be built up by electrostatic charge.
Risk of severe injury!
Risk of explosion!
• The connection lines must be made out of conductive material or provisions must be
made against creating an electrostatic charge.
5.2.1 Suction Connection
WARNING
Unprotected suction connection.
Risk of severe injury!
• Do not put hand or fingers in the suction connection.
NOTICE
Ingress of foreign objects or liquids.
Risk of damage to the machine!
If the inlet gas contains dust or other foreign solid particles:
• Install a suitable filter (5micron or less) upstream from the machine.
Connection size:
– DN100 ISO-K, DIN 28404
If a purge gas system or a liquid flushing device being installed:
– DN100 PN16, EN 1092-1
If the machine is used as part of a vacuum system:
• Busch recommends the installation of an isolation valve in order to prevent the
machine from turning backwards.
5.2.2 Discharge Connection
Connection size:
At the machine discharge connection:
– DN100 ISO-K, DIN 28404
At the silencer (SI) discharge connection (two optional versions available):
– DN80 PN16 + ANSI/ASME B16.5-3” class 150 lbs

Installation | 5
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 17 / 48
– R3
• Make sure that the discharged gas will flow without obstruction. Do not shut off or
throttle the discharge line or use it as a pressurised air source.
• Make sure that the counter pressure at the discharge connection (OUT) does not ex-
ceed the admissible pressure, see Technical Data [►45].
5.2.3 Cooling Water Connection
CWICWO PHE
CWI Cooling water inlet CWO Cooling water outlet
PHE Plate heat exchanger
• Connect the cooling water connections (CWI / CWO) to the water supply.
Connection size:
– G1/2, ISO 228-1 (CWI / CWO)
• Make sure that the cooling water complies with the following requirements:
Supply capacity l/min 12
Water pressure bar 1 ... 6
Supply temperature °C +5 ... +30
Required pressure differential across supply
and return
bar ≥ 1
• To reduce the maintenance effort and ensure a long product lifetime we recommend
the following cooling water quality:
Hardness mg/l (ppm) < 90
Properties Clean & clear
PH value 7 … 8
Particle size µm < 200
Chloride mg/l < 100
Electrical conductivity µS/cm ≤ 100
Free chloride mg/l < 0.3
Materials in contact with the cooling water Stainless steel
NOTE
Water hardness unit conversion.
1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french
degree)

5 | Installation
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5.2.4 Barrier Gas System Connection
PRV MV2BGC MANFME, NIP
FS-/0501
BGC Barrier gas connection FME Flow meter
FS Flow switch MAN Manometer
MV Solenoid valve NIP Nitrogen panel
PRV Pressure regulating valve
• Connect the barrier gas connection (BGC) to the gas supply.
Connection size:
– G1/4, ISO 228-1
• Electrically connect the solenoid valve (MV), see Wiring Diagram Solenoid Valve
[►27].
• Electrically connect the flow switch (FS) of the flow meter, see Wiring Diagram Flow
Switch [►30].
• Make sure that the gas complies with the following requirements:
Gas type Dry nitrogen or air
Gas temperature °C 0 ... 60
Maximum gas pressure bar 13
Recommended pressure setting at the
pressure regulating valve (PRV)
bar 3
Filtration µm 5
Recommended flow rate SLM* 3.5 ... 5.5
* standard litre per minute

Installation | 5
0870201731_NC0600_0630C_WCV_Ex_-0003_IM_en 19 / 48
5.2.5 Dilution Gas System Connection (Optional)
PRV MV5DGC MANFME, FR, NIP
FS-/0504 (optional)
DGC Dilution gas connection FME Flow meter
FR Flow regulator FS Flow switch
MAN Manometer MV Solenoid valve
NIP Nitrogen panel PRV Pressure regulating valve
• Connect the dilution gas connection (DGC) to the gas supply.
Connection size:
– G1/4, ISO 228-1
• Electrically connect the solenoid valve (MV), see Wiring Diagram Solenoid Valve
[►27].
If a flow switch is installed:
• Electrically connect the flow switch (FS) of the flow meter, see Wiring Diagram
Flow Switch [►30].
• Make sure that the gas complies with the following requirements:
Gas type Dry nitrogen
Gas temperature °C 0 ... 60
Maximum gas pressure bar 13
Recommended pressure setting at the
pressure regulating valve (PRV)
bar 2.5
Filtration µm 5
Recommended flow rate SLM* 30
* standard litre per minute

5 | Installation
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5.2.6 Purge Gas System Connection
PRV MV4PGC MANFME, FR, INFNIP
FS-/0503 (optional)
PGC Purge gas connection FME Flow meter
FR Flow regulator FS Flow switch
INF Inlet flange MAN Manometer
MV Solenoid valve NIP Nitrogen panel
PRV Pressure regulating valve
• Connect the purge gas connection to the gas supply.
Connection size:
– G1/4, ISO 228-1
• Electrically connect the solenoid valve (MV), see Wiring Diagram Solenoid Valve
[►27].
If a flow switch is installed:
• Electrically connect the flow switch (FS) of the flow meter, see Wiring Diagram
Flow Switch [►30].
• Make sure that the gas complies with the following requirements:
Gas type Dry nitrogen
Gas temperature °C 0 ... 60
Maximum gas pressure bar 13
Recommended pressure setting at the
pressure regulating valve (PRV)
bar 2.5
Filtration µm 5
Recommended flow rate SLM* ≥ 100
* standard litre per minute