BUSCH COBRA ATEX NC 0100-0300 B User manual

Instruction Manual
COBRA ATEX
Dry Screw Vacuum Pumps
NC 0100-0300 B (water-cooled version)
0870203597/-0001_en / Original instructions / Modifications reserved 11/12/2019
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...............................................................................................8
2.2 Application ........................................................................................................... 8
2.3 Start Controls .......................................................................................................9
2.4 Standard Features.................................................................................................9
2.4.1 Thermometer.............................................................................................9
2.4.2 Sealing Systems .........................................................................................9
2.4.3 Barrier Gas System.....................................................................................9
2.4.4 Nitrogen Panel...........................................................................................9
2.5 Accessories ........................................................................................................... 10
2.5.1 Gas Ballast Valve........................................................................................10
2.5.2 Silencer......................................................................................................10
2.5.3 Resistance Thermometer............................................................................10
2.5.4 Pressure Transmitter ..................................................................................10
2.5.5 Pressure Switch..........................................................................................10
2.5.6 Mechanical Seals........................................................................................10
2.5.7 PTFE Shaft Seals.........................................................................................11
2.5.8 Terminal box..............................................................................................11
2.5.9 Flame Arresters..........................................................................................11
2.6 Explanation of ATEX Classification ........................................................................11
2.6.1 ATEX Nameplate........................................................................................11
2.7 Safety concept......................................................................................................12
2.7.1 ATEX Classifications and Associated Accessories ........................................12
2.7.2 P&ID "Piping and Instrumentation Diagram" ............................................13
3 Transport ..................................................................................................................... 16
4 Storage......................................................................................................................... 16
5 Installation................................................................................................................... 17
5.1 Installation Conditions ..........................................................................................17
5.2 Connecting Lines / Pipes ......................................................................................18
5.2.1 Suction Connection....................................................................................18
5.2.2 Discharge Connection................................................................................19
5.2.3 Cooling Water Connection ........................................................................19
5.2.4 Barrier Gas System Connection ..................................................................21
5.2.5 Dilution Gas System Connection (Optional)...............................................22
5.2.6 Purge Gas System Connection ...................................................................24
5.2.7 Flame Arrester Bypass Connection (Optional) ............................................25
5.3 Earth Connection..................................................................................................26
5.4 Filling Oil..............................................................................................................26
5.5 Filling Cooling Liquid ............................................................................................ 28
5.6 Liquid Flushing Device Installation (Optional) ....................................................... 29
5.7 Fitting the Coupling..............................................................................................29
5.8 Electrical Connection ............................................................................................30
5.8.1 Wiring Diagram Three-Phase Motor (Pump Drive).....................................31
5.8.2 Wiring Diagram Solenoid Valve .................................................................32
5.9 Electrical Connection of the Monitoring Devices ................................................... 33
5.9.1 Wiring Diagram Resistance Thermometer ..................................................33
5.9.2 Wiring Diagram Pressure Switch ................................................................34
5.9.3 Wiring Diagram Pressure Transmitter.........................................................34
5.9.4 Wiring Diagram Vibration Sensor...............................................................35
5.9.5 Wiring Diagram Flow Switch......................................................................35

Table of Contents
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 3
5.9.6 Wiring Diagram Level Switch.....................................................................36
5.9.7 Wiring Diagram Pressure Switch (With Gas Lubricated Double
Mechanical Seals Only)..............................................................................
36
5.10 Electrical Connection of the Flame Arrester Bypass (Optional) ..............................36
5.10.1 Wiring Diagram Limit Switch .....................................................................36
5.10.2 Wiring Diagram Solenoid Valve .................................................................37
5.11 Flowchart .............................................................................................................38
6 Commissioning............................................................................................................ 39
6.1 Adjustment of the Thermostatic Valve (Direct Cooling Only)................................ 40
6.2 Conveying Condensable Vapours ......................................................................... 41
6.3 Liquid Flushing Procedure.....................................................................................41
6.4 Gas Purging Procedure ......................................................................................... 41
6.5 Trip Procedure......................................................................................................42
7 Maintenance................................................................................................................ 42
7.1 Maintenance Schedule.......................................................................................... 43
7.2 Oil Level Inspection .............................................................................................. 43
7.3 Cooling Liquid Level Inspection ............................................................................44
7.4 Oil Change...........................................................................................................45
7.5 Cooling Liquid Change .........................................................................................48
7.6 Calibration Procedure of the Electrical Devices ..................................................... 49
7.6.1 Procedure A...............................................................................................49
7.6.2 Procedure B ...............................................................................................49
7.6.3 Procedure C...............................................................................................49
7.6.4 Procedure D...............................................................................................49
7.6.5 Procedure E ...............................................................................................49
7.6.6 Procedure F ...............................................................................................49
7.6.7 Procedure G...............................................................................................50
7.6.8 Procedure H...............................................................................................50
7.7 Flame Arrester Maintenance .................................................................................50
8 Overhaul...................................................................................................................... 51
9 Decommissioning ........................................................................................................ 51
9.1 Dismantling and Disposal...................................................................................... 52
10 Spare Parts................................................................................................................... 52
11 Troubleshooting........................................................................................................... 53
12 Technical Data ............................................................................................................. 55
13 Cooling Liquid ............................................................................................................. 55
14 Oil ............................................................................................................................... 55
15 EU Declaration of Conformity - ATEX 1G(i)/2G(o)....................................................... 56
16 EU Declaration of Conformity - ATEX 2G(i/o) and 3G(i/o) .......................................... 57

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
methods. Nevertheless, residual risks may remain. This instruction manual highlights po-
tential 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
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 5 / 60
2 Product Description
NC 0100-0300 C ATEX 1G(i)/2G(o) (only the obligatory accessories are illustrated)
FME,
FS-/0501 TMTV
CWP
NP2 OFP
ODP, MP
OSG
PMR
CWD
EB
PRV
CWD
CWI
CWO
MANMV2
GC, NIF
TSA+/0101
IN, FA PSA or PS+
/0301
EB
OUT, FA TSA+/0102 TSA+/0103
OFP
OSG ODP, MP MTB
NC 0200 B with direct cooling
NC 0200 B with direct cooling
NP1 CWD
CLDCWI CWO
CLF
EV CLP
CLD
PHE
SV
NC 0100 B with plate heat exchanger
CLD Cooling liquid drain valve CLF Cooling liquid fill plug
CLP Cooling liquid pump CWD Cooling water drain plug
CWI Cooling water inlet CWO Cooling water outlet
CWP Cooling water pump EB Eye bolt
EV Expansion vessel FA Flame arrester
FME Flow meter FS Flow switch
GC Gas connection IN Suction connection
MAN Manometer MP Magnetic plug
MTB Motor terminal box MV Solenoid valve
NIF Nitrogen inlet filter NP Nameplate
ODP Oil drain plug OFP Oil fill plug
OSG Oil sight glass OUT Discharge connection
PHE Plate heat exchange PMR Plug for manual rotation of rotors
PRV Pressure regulating valve PS/PSA Pressure switch/transmitter
SV Safety valve TM Thermometer
TSA Temperature transmitter TV Thermostatic valve

2 | Product Description
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NC 0100-0300 C ATEX 2G(i/o) (only the obligatory accessories are illustrated)
FME,
FS-/0501* TMTV
CWP
NP2 OFP
ODP, MP
OSG
PMR
CWDPRV
CWD
CWI
CWO
MANMV2
GC, NIF
PSA or PS+
/0301
EB
OUT
TSA+/0102
TSA+/0103
OFP OSG ODP, MP MTB DA CLDCWI CWO
CLF
EV CLP
CLD
PHE
SV
NC 0200 B with direct cooling
NC 0100 B with plate heat exchanger
NC 0200 B with direct cooling
FME INMV4
MAN
SA+/0701
* recommended
NP1
CLD Cooling liquid drain valve CLF Cooling liquid fill plug
CLP Cooling liquid pump CWD Cooling water drain plug
CWI Cooling water inlet CWO Cooling water outlet
CWP Cooling water pump EB Eye bolt
EV Expansion vessel FME Flow meter
FS Flow switch GC Gas connection
IN Suction connection MAN Manometer
MP Magnetic plug MTB Motor terminal box
MV Solenoid valve NIF Nitrogen inlet filter
NP Nameplate ODP Oil drain plug
OFP Oil fill plug OSG Oil sight glass
OUT Discharge connection PGC Purge gas connection
PHE Plate heat exchange 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
TV Thermostatic valve

Product Description | 2
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 7 / 60
NC 0100-0300 C ATEX 3G(i/o) (only the obligatory accessories are illustrated)
TMTV
CWP
NP2 OFP
ODP,
MP
OSG
PMR
CWD CWI
CWO
EB
OUT
TSA+/0102
OFP OSG ODP, MP MTB CLDCWI CWO
CLF
EV CLP
CLD
PHE SV
NC 0200 B with direct cooling
NC 0100 B with plate heat exchanger
NC 0200 B with direct cooling
IN
CWD
OUTCDSIGB
NC 0200 B with silencer
and gas ballast valve (Options)
NP1
CD Condensate drain CLD Cooling liquid drain valve
CLF Cooling liquid fill plug CLP Cooling liquid pump
CWD Cooling water drain plug CWI Cooling water inlet
CWO Cooling water outlet CWP Cooling water pump
EB Eye bolt EV Expansion vessel
IN Suction connection MP Magnetic plug
MTB Motor terminal box NP Nameplate
ODP Oil drain plug OFP Oil fill plug
OSG Oil sight glass OUT Discharge connection
PHE Plate heat exchange PMR Plug for manual rotation of rotors
SI Silencer SV Safety valve
TM Thermometer TSA Temperature transmitter
TV Thermostatic valve

2 | Product Description
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NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum
pump’.
2.1 Operating Principle
Water-cooled version with direct cooling:
Water-cooled version with plate heat exchanger (optional):
The machine works on the one-stage, twin-screw pump principle.
Two screw rotors are rotating inside the cylinder. The pumped medium is trapped
between the cylinder and screw chambers, compressed, and transported to the gas out-
let. 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 compression 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 according to the scope of the Direct-
ive ATEX 2014/34/EU.
It is necessary to check and ensure that the process media is compatible with the pump
materials and that the explosion protection will not be compromised e.g. by corrosion. If
necessary, contact your local Busch representative.
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 [►11].
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.

Product Description | 2
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 9 / 60
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 [►11].
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 [►55].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►55].
2.3 Start Controls
The machine comes without start controls. The control of the machine is to be provided
in the course of installation.
The machine can be optionally equipped with a starter unit or a variable-frequency drive.
2.4 Standard Features
2.4.1 Thermometer
The thermometer allows a visual display of the cooling water temperature in the cooling
water chamber.
2.4.2 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 [►10] or PTFE
Shaft Seals [►11].
Sealing systems prevent the process gas going to the bearings chambers.
2.4.3 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.
2.4.4 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 pressure regulator 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.
With gas lubricated double mechanical seals, the machine must be switched off if the
nitrogen volume flow goes over the maximum set flow value.

2 | Product Description
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– 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.
2.5 Accessories
NOTE
Depending on the ATEX classification of the machine, some of the following accessories
may be mandatory, see ATEX Classifications and Associated Accessories [►12].
2.5.1 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 [►55].
2.5.2 Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas
noise.
A non-return flap can be optionally added to the silencer.
2.5.3 Resistance Thermometer
The resistance thermometer monitors gas temperature. It can be installed at three differ-
ent places depending on the ATEX classification.
Warning and trip signals must be set, see Wiring Diagram Resistance Thermometer
[►33].
2.5.4 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 [►34].
2.5.5 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 [►34].
2.5.6 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.

Product Description | 2
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 11 / 60
– Gas lubricated double mechanical seals on the motor side and oil lubricated single
mechanical seals on suction side.
The gas lubricated double mechanical seals require a pressure switch in order to monit-
ors if the gas pressure drops below the minimum allowable pressure. See Wiring Dia-
gram Pressure Switch (With Gas Lubricated Double Mechanical Seals Only) [►36].
2.5.7 PTFE Shaft Seals
The sealing systems on the motor side can also be equipped with PTFE shaft seals.
2.5.8 Terminal box
The machine can be optionally equipped with one or two terminal boxes. All electrical
devices, except the motor, are already wired to the terminal box.
2.5.9 Flame Arresters
The flame arresters are safety devices. They do not prevent explosion but avoid the
propagation of a deflagration within the machine compression chamber to the up and
downstream lines of the system.
To avoid a loss of suction capacity through the flame arrester at the machine inlet, a by-
pass connection with a ball valve can be optionally delivered, see Flame Arrester Bypass
Connection (Optional) [►25].
2.6 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 Ex h IIB T3 Gb X
II 2G Ex h IIB T3 Gb 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
Equipment protection level
(T2=300°C) ; (T3=200°C) ; (T4=135°C)
Type of protection
Special conditions for operation*
Type of protection
Explosion group outside the machine
Temperature class outside the machine
Equipment protection level
Special conditions for operation*
* The specific operating conditions are determined in this instruction manual.
2.6.1 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 | Product Description
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2.7 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.
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.
2.7.1 ATEX Classifications and Associated Accessories
The following table defines the obligatory accessories depending on the ATEX classifica-
tion.
(i) II 1G cIIB3 T4, T3
(o) II 2G cIIB T4, T3
TSA+
/0102
PSA+/0301
ATEX
MOT IIC
ATEX
CPL ECP
X X
X
X
X
X
X X
X
X
XX
XX
A
B
C
D
TSA+
/0103
ATEX
MOT IIB
(i) II 1G cIIB3 T4, T3
(o) II 2G cIIC T4, T3
X
X
X
SA+
/0701
X
X
X X
X
MV
MV2
MV3
MV2
MV3
MV2
MV2
FS-/0501
FS+/0501
X
X
PS+/0301
X
XX
E
F
(i) II 2G Ex h IIB T4, T3 Gb
(o) No ATEX zone
(i) II 3G Ex h IIC T4, T3 Gc
(o) II 3G Ex h IIB T4, T3 Gc
X
X X
(i) II 2G Ex h IIB T4, T3 Gb
(o) II 2G Ex h IIB T4, T3 Gb
(i) II 2G Ex h IIB T4, T3 Gb
(o) II 2G Ex h IIC T4, T3 Gb
XX
G
(i) II 3G Ex h IIC T4, T3 Gc
(o) II 3G Ex h IIC T4, T3 Gc XX
XX
H
(i) II 3G Ex h IIB T4, T3 Gc
(o) No ATEX zone
FA
X
X
MV2
MV3
TSA+
/0101
X
X
X
X
X
X
X
X
X
(X)
(X)
(X)
PS-
/0302
**
X
X
X
X
X
X
X
X
(X)
(X)
(X)
ATEX classification
(PS-/0302) and (FS+/0501) is only required if the machine
is equipped with gas lubricated double mechanical seals
*
(x) recommended
CPL Coupling ECP Pump earth connection
FA Flame arrester FS Flow switch
MOT Motor (IIB or IIC) MV Solenoid valve
PSA Pressure transmitter PS Pressure switch
SA Vibration transmitter TSA Resistance thermometer
For direct cooling version:
The temperature class of the machine can be influenced by the thermostatic valve ad-
justment, see Adjustment of the Thermostatic Valve (Direct Cooling Only) [►40].

Product Description | 2
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 13 / 60
2.7.2 P&ID "Piping and Instrumentation Diagram"
TSA+
0102
MV4
0201
LS-
0202
LS-
SA+
0701
TSA+
0103
PSA+
0301
MV3
MV2
MV5
FS-
0501
FME
FME
FME
FS-
0503
FS-
0504
FLV
NRV
NRV
NRV
GC
NIF
MAN
PS+
0301
IN
OUT
TSA+
0101
FA
FA
D C
FS+
0501
FME
NRV
D C
E
EPS-
0302
M
CPL MOT
DN50 PN16
CWO
CWI
MV7
CWP
TV
WIF
NRV A
B
FL
CWO
CWI
MV7
PHE
CLP
TTV
55°C
A
B
G1/2
G1/2
G1/4
GS
0601
GS
0602
MV6
PMC
PRV
MAN PRV
MAN PRV
MAN PRV
G1/4
Barrier gas system
Purge gas system
Dilution gas system
With gas lubricated double mechanical seals
Flame arrester
bypass
= optional
= variant
Flushing liquid device
With plate heat exchanger
With direct cooling
or
DN15
PN10
DN40 PN16 (NC0100B)
DN50 PN16 (NC0200-0300B)
DN15
PN10
DN50 PN16
DN40 PN16 (NC0100B)
DN50 PN16 (NC0200-0300B)
MV5
GC
G1/4
For dilution gas system only
or
= optional
Barrier gas system
Purge gas system
Dilution gas system
Flushing liquid device
= variant
With gas lubricated double mechanical seals
P&ID for classification A and B Flame arrester
bypass
(see ATEX classification, chapter 2.7.1)
For dilution gas system only
CPL Coupling CWI Cooling water inlet
CWO Cooling water outlet CLP, CWP Cooling liquid/water pump
FA Flame arrester FL Flow limiter
FLV Flushing liquid vessel FME Flow meter
FS Flow switch GC Gas connection
GS Limit switch IN Suction connection
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
PMC Pneumatic connection PRV Pressure regulating valve
PSA Pressure transmitter PS Pressure switch
SA Vibration transmitter TSA Resistance thermometer
TTV Three-way thermostatic valve TV Thermostatic valve
WIF Water inlet filter

2 | Product Description
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MV4
0201
LS-
0202
LS-
SA+
0701
MV3
MV2
FS-
0501
FME
FME
FME
FS-
0503
FS-
0504
FLV
NRV
NRV
GC
NIF
IN
OUT
CWO
CWI
MV7
CWP
TV
WIF
NRV A
B
FL
D C
FS+
0501
FME
NRV
D C
E
EPS-
0302
IS
M
CPL MOT
NRV
SI TSA+
0103
PSA+
0301
PS+
0301
CWO
CWI
MV7
PHE
CLP
TTV
55°C
A
B
Ø85mm
DN40 PN16 (NC0100B)
DN50 PN16 (NC0200-0300B)
G1/4
G1/2
DN15
PN10
G1/2
DN40 PN16 (NC0100B)
DN50 PN16 (NC0200-0300B)
GB
MAN PRV
MAN PRV
MAN PRV
MAN PRV
Barrier gas system
Purge gas system
Dilution gas system
With gas lubricated double mechanical seals
= optional
= variant
Flushing liquid device
With plate heat exchanger
With direct cooling
or
Air
DN15
PN10
MV5
MV5
GC
G1/4
For dilution gas system only
TSA+
0102
or
P&ID for classification C , D and E
= optional
Barrier gas system
Purge gas system
Dilution gas system
Flushing liquid device
= variant
With plate heat exchanger
With direct cooling
Air
(see ATEX classification, chapter 2.7.1)
With gas lubricated double mechanical seals
For dilution gas system only
With gas lubricated double mechanical seals
CLP Cooling liquid pump CPL Coupling
CWI Cooling water inlet CWO Cooling water outlet
CWP Cooling water pump FL Flow limiter
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 PRV Pressure regulating valve
PSA Pressure transmitter PS Pressure switch
SA Vibration transmitter SI Silencer
TSA Resistance thermometer TTV Three-way thermostatic valve
TV Thermostatic valve WIF Water inlet filter

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0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 15 / 60
TSA+
0102
MV4
0201
LS-
0202
LS-
SA+
0701
MV3
MV2
FS-
0501
FME
FME
FME
FS-
0503
FS-
0504
FLV
NRV
NRV
NRV
GC
NIF
IN
OUT
D C
FS+
0501
FME
NRV
D C
E
EPS-
0302
SI
IS
M
CPL MOT
TSA+
0103
PSA+
0301
PS+
0301
GB
CWO
CWI
MV7
PHE
CLP
TTV
55°C
A
B
G1/4
G1/2
G1/2
Ø85mm
MAN PRV
MAN PRV
MAN PRV
MAN PRV
Barrier gas system
Purge gas system
Dilution gas system
With gas lubricated double mechanical seals
= optional
= variant
Flushing liquid device
With plate heat exchanger
With direct cooling
Air
or
DN40 PN16 (NC0100B)
DN50 PN16 (NC0200-0300B)
DN15
PN10
DN40 PN16 (NC0100B)
DN50 PN16 (NC0200-0300B)
DN15
PN10
MV5
MV5
GC
G1/4
For dilution gas system only
CWO
CWI
MV7
CWP
TV
WIF
NRV A
B
FL
or
P&ID for classification F , G and H
= optional
Barrier gas system
Purge gas system
Dilution gas system
Flushing liquid device
= variant
With plate heat exchanger
With direct cooling
With gas lubricated double mechanical seals
Air
(see ATEX classification, chapter 2.7.1)
For dilution gas system only
CLP Cooling liquid pump CPL Coupling
CWI Cooling water inlet CWO Cooling water outlet
CWP Cooling water pump FL Flow limiter
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 PRV Pressure regulating valve
PSA Pressure transmitter PS Pressure switch
SA Vibration transmitter SI Silencer
TSA Resistance thermometer TTV Three-way thermostatic valve
TV Thermostatic valve WIF Water inlet filter

3 | Transport
16 / 60 0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en
3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
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
shown.
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)
• 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
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 17 / 60
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 met.
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 [►55].
• Make sure that the environmental conditions comply with the protection class of the
motor and the electrical instruments.
• 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 is acceptable.
• Check the oil level, see Oil Level Inspection [►43].
If the machine is equipped with a plate heat exchanger (PHE):
• Check the cooling liquid level, see Cooling Liquid Level Inspection [►44].
• Make sure that the cooling water complies with the requirements, see Cooling Water
Connection [►19].
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 “E” and “H” (see ATEX Classifications and Associated Accessor-
ies [►12]):
• Make sure that the installation space or location is ventilated enough in order to
prevent the formation of an explosive area.

5 | Installation
18 / 60 0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en
5.2 Connecting Lines / Pipes
• Remove all protective covers 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 build up an 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.
If the machine corresponds to ATEX Classification “A” or “B” (see ATEX Classifications
and Associated Accessories [►12])
• The machine must be equipped with flame arresters at the suction and discharge
connections.
Connection size(s):
With flame arresters (FA):
– DN50 PN16, EN 1092-1
– DN80 PN16, EN 1092-1 (Optional)
Without flame arresters:
– DN40 PN16, EN 1092-1 for NC 0100 B
– DN50 PN16, EN 1092-1 for NC 0200 B and NC 0300 B
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.

Installation | 5
0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en 19 / 60
5.2.2 Discharge Connection
If the machine corresponds to ATEX Classification “A” or “B” (see ATEX Classifications
and Associated Accessories [►12])
• The machine must be equipped with flame arresters at the suction and discharge
connections.
Connection size(s):
At the machine discharge connection:
– Ø85 / 8 x M8
With flame arrester (FA):
– DN50 PN16, EN 1092-1
With extra flange (straight or elbow):
– DN40 PN16, EN 1092-1 for NC 0100 B
– DN50 PN16, EN 1092-1 for NC 0200 B and NC 0300 B
At the silencer (SI) discharge connection (Optional):
– DN40 PN16, EN 1092-1 for NC 0100 B
– DN50 PN16, EN 1092-1 for NC 0200 B and NC 0300 B
• 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 (also termed back pressure) at the discharge con-
nection (OUT) does not exceed the maximum allowable discharge pressure, see Tech-
nical Data [►55].
5.2.3 Cooling Water Connection
Water-cooled version with direct cooling:
1
2
3
4
5
CWOCWITV
Thermostatic valve
adjustment
CWI Cooling water inlet CWO Cooling water outlet
TV Thermostatic valve

5 | Installation
20 / 60 0870203597_NC0100-0300B_WCV_Ex_-0001_IM_en
Water-cooled version with plate heat exchanger (optional):
CWOCWI 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:
– DN15 PN10, DIN 2566 (CWI / CWO) with direct cooling
– G1/2, ISO 228-1 (CWI / CWO) with plate heat exchanger
NOTICE
Ambient temperature below 0°C.
Risk of freezing in the cooling system!
• Make sure that the water supply complies with the cooling water requirements.
• Foresee antifreeze in the supply cooling water system.
• Make sure that the cooling water complies with the following requirements:
Supply capacity l/min 2 ... 4
Water pressure bar 3 ... 6 (direct cooling)
1...6(plate heat exchanger)
Supply temperature °C +10 ... +25
Required pressure differential across supply
and return
bar ≥ 3 (direct cooling)
>0.5(plateheatexchanger)
• 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, copper and cast iron
NOTE
Water hardness unit conversion.
1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french degree)