BUSCH R5 PLUS User manual

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Instruction Manual
R5 PLUS
Oil-Lubricated Rotary Vane Vacuum Pumps
RA 1000-1600 A PLUS
0870238866/-_en / Original instructions / Modifications reserved 16/09/2021

Table of Contents
2 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
Table of Contents
1 Safety .......................................................................................................................................4
2 Product Description ..................................................................................................................5
2.1 Operating Principle .......................................................................................................... 6
2.2 Application....................................................................................................................... 6
2.3 Standard Features ............................................................................................................ 7
2.3.1 User Interface........................................................................................................7
2.3.2 Control Unit .......................................................................................................... 7
2.3.3 Monitoring Devices ............................................................................................... 7
2.3.4 I/O and Communication Port ................................................................................7
2.3.5 Gas Ballast Valve ................................................................................................... 7
2.4 Optional Accessories ........................................................................................................ 7
2.4.1 Inlet Filter ..............................................................................................................7
2.4.2 Inlet Filter Condition Monitoring Kit ...................................................................... 7
2.4.3 Water-Oil Heat Recovery Unit............................................................................... 8
2.5 P&ID "Piping and Instrumentation Diagram"................................................................... 8
2.6 LED Indicators .................................................................................................................. 8
2.7 Description of User Interface Functions ............................................................................ 9
2.7.1 Menu Overview .................................................................................................... 9
2.7.2 Bottom Bar ............................................................................................................10
2.7.3 Navigation............................................................................................................. 10
2.7.4 Role and User........................................................................................................11
2.7.5 System Settings ..................................................................................................... 12
2.7.6 Machine and Software Identification ..................................................................... 13
2.7.7 Ethernet Settings ................................................................................................... 13
2.8 Web Visualization ............................................................................................................ 14
3 Transport ..................................................................................................................................17
4 Storage .....................................................................................................................................18
5 Installation................................................................................................................................18
5.1 Installation Conditions...................................................................................................... 18
5.2 Connecting Lines / Pipes .................................................................................................. 19
5.2.1 Suction Connection ............................................................................................... 19
5.2.2 Discharge Connection ........................................................................................... 20
5.2.3 Cooling Water Connection (Optional) ................................................................... 20
5.2.4 Inlet Filter Condition Monitoring Kit ...................................................................... 21
5.2.5 External Inlet Pressure Sensor ................................................................................ 22
5.3 Filling Oil.......................................................................................................................... 23
5.4 Fitting the Coupling ......................................................................................................... 24
5.5 Electrical Connection ........................................................................................................ 24
5.5.1 PLUS Machine.......................................................................................................25
5.5.2 Wiring Diagram Control Unit................................................................................. 26
6 Commissioning.........................................................................................................................27
6.1 Prerequisites Before Use ................................................................................................... 27
6.2 Configuration................................................................................................................... 27
6.3 Start Up ........................................................................................................................... 27
7 In Operation .............................................................................................................................28
7.1 Control Mode .................................................................................................................. 29
7.1.1 Local/Manual ........................................................................................................ 29
7.1.2 Local/Auto "Week Planner".................................................................................. 29
7.1.3 Remote/Auto ........................................................................................................ 31

Table of Contents
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 3
7.2 Operating Mode .............................................................................................................. 31
7.2.1 Speed Control .......................................................................................................32
7.2.2 Pressure Control ....................................................................................................32
7.3 Ecomode .......................................................................................................................... 33
7.4 Gas Ballast Valve Control ................................................................................................. 34
7.5 Warm-up / Cool-down Modes......................................................................................... 34
7.5.1 Conveying Condensable Vapours ..........................................................................35
7.6 Optional Inlet Valve Control............................................................................................. 36
7.7 Optional Vacuum Booster Control.................................................................................... 37
7.8 Monitoring....................................................................................................................... 40
7.8.1 Operating Information .......................................................................................... 40
7.8.2 Operating Data ..................................................................................................... 41
7.8.3 History .................................................................................................................. 44
7.8.4 Operating Curves ..................................................................................................45
7.9 Dysfunction...................................................................................................................... 47
7.9.1 Warnings and Alarms Thresholds........................................................................... 47
7.9.2 Warning/Alarm Acknowledgment Procedure......................................................... 48
7.10 Stop the Machine............................................................................................................. 49
8 Maintenance.............................................................................................................................49
8.1 Maintenance Schedule ..................................................................................................... 50
8.2 Oil Level Inspection.......................................................................................................... 52
8.3 Oil and Oil Filter Change.................................................................................................. 52
8.4 Exhaust Filter Change....................................................................................................... 54
8.5 Air Heat Exchanger Cleaning............................................................................................ 55
9 Overhaul...................................................................................................................................56
10 Decommissioning.....................................................................................................................56
10.1 Dismantling and Disposal ................................................................................................. 56
11 Spare Parts................................................................................................................................57
12 Troubleshooting .......................................................................................................................58
13 Technical Data..........................................................................................................................62
14 Oil ............................................................................................................................................63
15 EU Declaration of Conformity...................................................................................................64
16 UK Declaration of Conformity ..................................................................................................65

1 | Safety
4 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
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
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 5 / 68
2 Product Description
NP
IN
OF LS
CU
ESS
GB1
AHE
OUT1
EF
PSA1
OFP
OSGODP
AIL
HMI
PIL
FM
SSB
PWS
OSTS1 MOT
LAN
MS
VG
VFD
FV2 FV1
MTB
GB2
TS2
OUT2 EB
TSAPSA2
AHE Air-oil heat exchanger AIL Alarm indicator light
CU Control unit EB Eye bolt
EF Exhaust filter ESS Emergency stop switch
FM Filter material FV Float Valve
GB Gas ballast valve HMI User interface (human-machine)
IN Suction connection LAN LAN Communication port (Modbus TCP/IP)
LS Level switch (oil level) MOT Motor (pump drive)
MS Main switch MTB Motor terminal box
NP Nameplate ODP Oil drain plug
OF Oil filter OFP Oil fill plug
OS Oil separator OSG Oil sight glass
OUT Discharge connection PIL Power indicator light
PSA1 Pressure transmitter
(inlet gas pressure)
PSA2 Pressure transmitter
(exhaust gas pressure in the oil separator)

2 | Product Description
6 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
PWS Power supply (cable gland) SSB Start/Stop button
TS Temperature switch TSA Resistance thermometer (oil temp.)
VFD Variable Frequency Drive VG Ventilation grid
NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum
pump’.
NOTE
Illustrations
In this instruction manual the illustrations may differ from the machine appearance.
2.1 Operating Principle
The machine works on the rotary vane principle.
The oil seals the gaps, lubricates the vanes and takes away compression heat.
The oil filter cleans the circulating oil.
Exhaust filters separate the oil from the discharged gas.
2.2 Application
The machine is intended for the suction of air and other dry, non-aggressive, non-toxic
and non-explosive gases.
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 non-potentially explosive environment.
The machine is designed for indoor installation, in case of outdoor installation, ask your
Busch representative in order to take specific precautions.
The machine is capable of maintaining ultimate pressure, see Technical Data [►62].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►62].

Product Description | 2
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 7 / 68
2.3 Standard Features
2.3.1 User Interface
A user interface, also termed human-machine interface (HMI), allows the control, moni-
toring and configuration of the machine via a 7.5” touchscreen.
Further information in the chapter Description of User Interface Functions [►9].
2.3.2 Control Unit
The control unit is an electrical cabinet where a variable-frequency drive, a PLC and oth-
er electrical components are integrated.
The power supply must be connected to it, see Electrical Connection.
2.3.3 Monitoring Devices
The machine is equipped with several monitoring devices to visualise the operating val-
ues, machine conditions and to protect the machine from any severe damage.
The oil temperature, oil level, inlet gas pressure and counter pressure at the discharge
can be displayed when the machine is running, see Monitoring [►40].
Two signal levels are transmitted, a warning and an alarm/trip, see Dysfunction [►47].
2.3.4 I/O and Communication Port
The control unit (CU) is equipped with a RJ45 (Modbus) communication port that can al-
low remote control and monitoring of the machine.
• Refer to the specific document “Pump Control Instructions, art. no.: 0870213261” for
more details or contact your Busch representative.
2.3.5 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 [►62].
2.4 Optional Accessories
2.4.1 Inlet Filter
The inlet filter protects the machine against dust and other solids in the process gas. The
inlet filter is available with a cartridge.
2.4.2 Inlet Filter Condition Monitoring Kit
The Inlet filter condition monitoring kit monitors the pressure differential in the inlet filter
cartridge, to detect when replacement is required. The inlet filter cartridge must be re-
placed when the pressure differential reaches a certain value, which depends on the ap-
plication and operating pressure. This pressure differential threshold must be set in the
control unit, so that a warning is displayed when replacing the cartridge is recommend-
ed, refer to the specific document "Pump Control Instructions, art. no.: 0870213261".

2 | Product Description
8 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
2.4.3 Water-Oil Heat Recovery Unit
For heat recovery purpose or in case of unfavorable ambient conditions, a water-oil heat
exchanger can be provided. See Cooling Water Connection (Optional) [►20].
2.5 P&ID "Piping and Instrumentation Diagram"
PSA1
P
M
CPL MOT1
GB
Air
NRV
IF
inlet gas
LS
low oil level
alarm (trip)
PSA2
P
TSA
Toil
IN
OUT
OF
TS1
Texhaust gas
VP
exhaust gas
Optional
DN150
DN125
TS2
Texhaust gas
AHE Air-oil heat exchanger
(fan driven by the pump shaft)
CPL Coupling
GB Gas ballast IF Inlet filter (Optional)
IN Suction connection LS Level switch "alarm/trip” (oil level)
MOT1 Motor (pump drive) NRV Non-return valve
(not used as an isolation valve)
OF Oil filter OUT Discharge connection
PSA1 Pressure transmitter
(inlet gas pressure)
PSA2 Pressure transmitter
(counter pression in the oil separator)
TSA Resistance thermometer (oil temp.) TS Temperature switch (exhaust gas temp.)
TTV Three-way thermostatic valve VP Vacuum pump
2.6 LED Indicators
Next to the user interface, there are three LED’s which give a visual indication of the ma-
chine state.
The LED is green when
the machine is powered
The LED is green when
the machine is running
The LED flashes in red
when a warning occurred /
The LED is continuously
red when an alarm occurred
Power indicator light (PIL)Start/stop button (SSB) Alarm indicator light (AIL)

Product Description | 2
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 9 / 68
2.7 Description of User Interface Functions
The display is divided into three distinct parts.
01.08.2020 - 15:00 ?
Menu tabs
Information
panel
Bottom bar
2.7.1 Menu Overview
The menu consists of four main tabs with their own sub-tabs:
– The tab “HOME”, which is the principal display, is mainly useful for live monitoring.
HOME
MAIN
OPERATIONS
MONITORING
MAINTENANCE SYSTEM
ALARM
– The tab “OPERATIONS” displays the operating parameters/modes and allows con-
trol of the machine.
HOME
MODE
OPERATIONS
PARAMETERS
MAINTENANCE SYSTEM
WEEK PLANNER
– The tab “MAINTENANCE” displays the history of malfunctions, maintenance inter-
vals and operating curves.
HOME
HISTORY
OPERATIONS
SERVICE
MAINTENANCE SYSTEM
TREND
– The tab “SYSTEM” allows to set or change settings, provides information about the
product and its distributor.
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL ETHERNET

2 | Product Description
10 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
2.7.2 Bottom Bar
The bottom bar provides different pieces of information, in particular the machine state
and warning/alarm status.
?
01.08.2020 - 15:00
OFF
RUNNING
WARNING
ALARM
Machine state
Warnings and alarms
status Date and hour
Screen
brightness
Help
2.7.3 Navigation
When several screens are available in the information panel, dots and “PREVIOUS/
NEXT” buttons are displayed above the bottom bar.
• Press either on a dot or “PREVIOUS/NEXT” button to pass from a screen to another
one.
PREVIOUS NEXT
The switch button is black when it is disabled and orange when it is enabled.
• Press on the switch button to change its state.
If a password is required:
• Enter the password, see the chapter Role and User [►11].
Disabled
Enabled
Off
On
When the character “>” is displayed in a cell of the information panel, that means a step
further is available. For example: a redirect link to another view or to open a specific ed-
iting view.
• Press in the cell to open the next dialog windows.
If a password is required:
• Enter the password, see the chapter Role and User [►11].
>
>
Date
Target speed
01 / 01 / 2021
100 %

Product Description | 2
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 11 / 68
2.7.4 Role and User
Three roles of user rights are predefined in the system:
– Role 1 ► Operator
This role is intended for machine operators to control the machine (limited rights) or
monitor operating values. It does not require any password.
– Role 2 ► Installation/Maintenance technician
This role is intended for installation/maintenance technicians to configure the machine
according to the application. The password for this role can be found in the separate
sheet attached to this instruction manual and allows an access to the following features:
– change operating mode,
– reset hours before the next service,
– set the remote control and monitoring parameters, refer to the specific document
"Pump Control Instructions, art. no.: 0870213261".
– Role 3 ► Busch Service
Only authorized personnel from Busch Service have this level of access rights.
NOTE
In case of any questions related to the machine settings:
• Please contact Busch Service.
When a password is required, the display shows this screen:
Password
CANCEL
***
SAVE
• Press on the three stars.
• Fill the correct password in the number pad according to your access right.
• Save it.
• From now on, the specific rights are open for a limited period ► delay of 5 minutes.

2 | Product Description
12 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
2.7.5 System Settings
To edit the system settings (such as date/time, language and units):
• Go to “SYSTEM” > “SETTINGS”.
• Press on the value to change the data.
>
>
>
>
>
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL
Date Language
Time Units
mbar / mbar g
Warnings and alarms thresholds
°C
English01 / 07 / 2021
13 : 48
ETHERNET
Advanced settings
NOTE
Warnings and alarms thresholds
Thresholds can only be changed by Busch Service “Role 3”, see the predefined factory
settings in the chapter Warnings and Alarms Thresholds [►47].
NOTE
Advanced settings
Advanced settings can only be changed by Busch Service “Role 3”, refer to the specific
document "Pump Control Instructions, art. no.: 0870213261".

Product Description | 2
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 13 / 68
2.7.6 Machine and Software Identification
To display the machine and software identification:
• Go to “SYSTEM” > “MODEL”.
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL
Vacuum pump type Vacuum pump model
Software HMI Software PLC
Serial number
R5 PLUS RA 1600 A PLUS
3.03.0
CHM120400012
ETHERNET
2.7.7 Ethernet Settings
To configure the ethernet settings according to your network:
• Go to “SYSTEM” > “ETHERNET”.
• Make sure that the Ethernet port (COM) on the right side of the control unit (CU) of
the machine is connected to a computer or to the company network.
• Change the values on the right side of the screen (Change settings), password re-
quired ► Role 2, see Role and User [►11].
• Press on the switch button to save the new settings.
NOTE
The current Ethernet values are displayed in the left side of the screen (Ethernet settings).
To change these values, it is necessary to fill in all the fields in the right side of the
screen (Change settings) before applying the changes by pressing on the switch but-
ton:
• New IP address
• New subnet mask
• New gateway
ðTo change the Ethernet settings, it is necessary to connect the PLUS pump with the
desired equipment beforehand via the Ethernet port available on the right side of the
control cabinet (LAN - see illustration in the chapter “Product Description” of the in-
struction manual of the vacuum pump).

2 | Product Description
14 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL ETHERNET
Off
Ethernet settings
Current IP address
192 . 168 . 0 . 22 0 . 0 . 0 . 0
New IP address
Change settings
0 . 0 . 0 . 0
New subnet maskCurrent subnet mask
0 . 0 . 0 . 0
New gatewayCurrent gateway
255 . 255 . 255 . 0
192 . 168 . 0 . 1
/!\ For a modification of the IP address,
an active Ethernet connection is necessary.
Description Default value
IP address 192.168.0.22
Subnet mask 255.255.255.0
Gateway 192.168.0.1
PLC port (0-65535) 502 (cannot be changed)
PLC Slave no. 247 (F7) (cannot be changed)
2.8 Web Visualization
Each machine has a built-in Web visualization interface, which allows remote monitoring
of the main operating parameters from a computer (via a LAN connection or via an op-
tional WIFI connection), a tablet or a smartphone (via an optional WIFI connection).
To use the Web visualization interface via a LAN connection:
• Connect an Ethernet cable to the Ethernet port (COM) on the right side of the control
unit (CU) of the machine.
• Connect the Ethernet cable to the company network or to the computer. To connect
the Ethernet cable to the computer, use a USB/LAN adapter or connect it directly to
the Ethernet port of the computer and use the internal network card (administrator
access required).
• Check the ethernet settings of the machine in the “Ethernet Settings” menu of the
User Interface Display (HMI), see Ethernet Settings [►13]. By default, the ethernet
settings are:
– IP address: 192.168.0.22
– Subnet mask: 255.255.255.0
– Gateway: 192.168.0.1
• Check the ethernet settings of the computer network (Internet Protocol Version 4
(TCP/IPv4) Properties). The Subnet mask and the first 3 bytes of the IP address must
be the same as on the PLUS machine.

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Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 15 / 68
• Open your web browser (full screen window) and type the IP address of the machine
to monitor in the address bar, followed by: :8080/smartpump.htm. By default, the
whole address to be typed in the web browser is: 192.168.0.22:8080/smartpump.htm
• When the Web visualization interface opens, select “Computer” as monitoring device.
NOTE
The following illustrations are taken from the web visualization of the "R5 RA 0760 A
PLUS" vacuum pump.
• The main screen, “Dashboard”, shows the main operating parameters and settings of
the machine (machine status, operating mode, running hours, inlet pressure,…).
• Use the icons in the bottom bar to navigate in the Web visualization interface.

2 | Product Description
16 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
• The second page “Service” shows the service table of the machine and Busch service
contact information.
• The third page “My vacuum pump” gives general information about the machine.
NOTE
• Contact Busch:
ðIf the Ethernet port of the machine (COM) is already used for remote control /
monitoring purpose.
OR
ðIn order to use the Web visualization function via a WIFI connection (requires an
optional WIFI module).
• The Web visualization interface is optimized for Google Chrome.
• To change the IP address of the machine (in the event it is already used by another
machine for instance), go to the “Ethernet Settings” menu of the User Interface Dis-
play (HMI) on the machine, see Ethernet Settings [►13].

Transport | 3
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 17 / 68
3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
WARNING
Transport and lifting.
Risk of severe injury!
• Lift the machine from underneath with care to prevent the load from tipping over.
• Do not use straps, ropes or other lifting means.
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. Starting the machine with excessive quantities of oil in the
cylinder will immediately break the vanes and ruin the machine!
• Drain the oil prior to every transport or always horizontally transport the machine.
Machine weight: see the technical data or the nameplate (NP)
Use a forklift to lift the machine.
• Check the machine for transport damage.
If the machine is secured to a base plate:
• Remove the machine from the base plate.

4 | Storage
18 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
4 Storage
• Seal all apertures with adhesive tape or reuse provided caps.
NOTICE
Long storage time.
Risk of damage to the machine!
• Due to a long storage time the capacitors of the variable-frequency drive can lose effi-
ciency because of electrochemical processes. In the worst case, it can lead to a short-
circuit and therefore to a damage to the variable-frequency drive of the machine.
• Connect the machine every 18 months for 60 minutes to the mains.
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 0 ... 30 °C.
5 Installation
5.1 Installation Conditions
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.
~50 cm
~80 cm
~100 cm
~100 cm
• Make sure that the environment of the machine is not potentially explosive.
• Make sure that the ambient conditions comply with the Technical Data [►62].
• Make sure that the environmental conditions comply with the protection class IP54.
• Make sure that the installation space or location is vented such that sufficient cooling
of the machine is provided.

Installation | 5
Instruction Manual R5 RA 1000-1600 A PLUS_EN_en 19 / 68
• Make sure that cooling air inlets and outlets are not covered or obstructed and that
the cooling air flow is not affected adversely in any other way.
• 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.
• Make sure that all provided covers, guards, hoods, etc. are mounted.
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.
5.2 Connecting Lines / Pipes
• Remove all protective covers before installation.
• 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 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.
• Make sure that the connection flanges are fitted with the appropriate gaskets.
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.
• The machine is not suitable for liquid suction.
Connection size(s):
– DN150 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 oil
from flowing back to the vacuum system.

5 | Installation
20 / 68 Instruction Manual R5 RA 1000-1600 A PLUS_EN_en
5.2.2 Discharge Connection
CAUTION
The discharge gas contains small quantities of oil.
Risk to health!
If air is discharged into rooms where persons are present:
• Make sure that sufficient ventilation is provided.
Connection size(s):
– DN125 PN16, EN 1092-1
• 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.
Unless the aspirated air is discharged to the environment right at the machine:
• Make sure that the discharge line either slopes away from the machine or provide a
liquid separator or a siphon with a drain cock, so that no liquids can flow back into the
machine.
• 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 [►62].
5.2.3 Cooling Water Connection (Optional)
WHE
CWO
CWI
MVWF
Water-oil heat exchanger with inlet accessories TV
CWI Cooling water inlet CWO Cooling water outlet
MV Solenoid valve TV Thermostatic valve
WF Water filter WHE Water-oil heat exchanger
The thermostatic valve (TV) is used to control the oil flow in order to keep a stable ma-
chine temperature.
The factory adjustment of the thermostatic valve (TV) is approx. 55°C-70°C oil tempera-
ture.
The solenoid valve (MV) is used to stop the cooling water circulation when the machine
is not running or when the oil temperature is lower than 60°C.
• Connect the cooling water connections (CWI / CWO) to the water supply.
Connection size: