Pfeiffer Vacuum OKTA 1500 G User manual

PW 0261 BEN/G (1605)
OPERATING INSTRUCTIONS EN
Translation of the original instructions
OKTA 1500 G/GM
Roots Pump

Table of contents
2
Table of contents
1 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Protective equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Range of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Filling with lubricant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4 Connecting the fore-vacuum side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.5 Connecting a gas cooler (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.6 Connecting the cooling water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.7 Temperature monitoring (option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.8 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.9 Connecting accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 Before switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 Changing the lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3 Cleaning the suction chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.4 Assembling the motor and coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.2 Re-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
12.1 Documentation for accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
13 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

About this manual
3
13.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
13.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicable EU guidelines. All information provided in this
operating manual refers to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.com.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.com
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
Okta 1500 G/GM Operating instructions
Declaration of conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
For version with magnetic coupling PW 0142 BN*
For version with crown gear coupling, assembly instructions of the coupling manufacturer
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.

4
About this manual
Pictographs
Instructions in the
text
Work instruction: here you have to do something.
Abbreviations RSSR: Radial shaft seal ring
MS: Mechanical seal
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Exhaust flange (fore-vacuum flange)
Electrical connection
Measuring connection for pressure or gas temperature
Sealing gas connection
Prohibition of an action to avoid any risk of accidents, the disregarding
of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents
Important information about the product or this document
V
M

Safety
5
2Safety
2.1 Safety precautions
●Do not expose any body parts to the vacuum.
●Observe the safety and accident prevention regulations.
●Check regularly that all safety precautions are being complied with.
●Do not carry out any unauthorised modifications or conversions to the pumps.
●Depending on the operating and ambient conditions, the surface temperature of the
pumps may rise above 100 °C. Use suitable finger guards if necessary.
●When returning the pumps to us please note the instructions in the Service section.
●Depending on the location, sound pressure levels of up to 105 dB(A) can occur. It is
therefore important to use appropriate equipment to protect yourself against the noise.
The following safety instructions are only valid for the disassembly of the drive
system for a vacuum pump with a magnetic coupling:
●When disassembling the drive system from the pump housing, the strong magnetic
field may influence the function and operational reliability of electrical and electronic
devices.
●Persons with cardiac pacemakers must keep away from the magnetic coupling.
Danger to life!
–Minimum distance: 2 m!
●Disassembled magnetic couplings must be kept away from computers, data storage
media and other electronic components.
●Keep the disassembled components of the magnetic coupling separate at all times.
Danger of crushing!
●Do not allow any magnetised parts into the vicinity of the magnetic coupling. Danger
of injury!
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum pump
must read and observe the safety-related parts of these operating instructions.
The operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
Installation and operation of accessories
Pfeiffer Vacuum pumps can be equipped with a series of adapted accessories. The in-
stallation, operation and maintenance of connected devices are described in detail in
the operating instructions of the individual components.
For information on order numbers of components, see "Accessories".
Use original accessory parts only.

6
Safety
2.2 Protective equipment
Determined situations concerning the handling of vacuum pumps require wearing of per-
sonal protective equipment. The owner, respectively the employer are obligated to pro-
vide an adequate equipment to any operating persons.
2.3 Proper use
●The vacuum pump may only be used to generate a vacuum.
●Use sealing gas, depending on the process.
●Installation, operating and maintenance regulations must be complied with.
●Other accessories, than those described in this manual, must not be used without the
agreement of Pfeiffer Vacuum.
●Only use the standard lubricants for applications with oxygen concentration ≤21 %.
At higher oxygen concentrations use application-specific lubricant after consulting
Pfeiffer Vacuum.
DANGER
Danger to health by hazardous substances during maintenance or installation
Depending on the process vacuum pumps, components or operating fluids can be con-
taminated by toxic, reactive or radioactive substances.
Wear adequate protective equipment during maintenance and repairs or in case of
reinstallation.
CAUTION
Risk of injury through hot surfaces
Vacuum pumps can become hot during operation.
Allow the pump to cool before maintenance and repairs.
If necessary wear protective gloves according to EN 420.
WARNING
Increased noise emission!
Increased noise emission can occur within a limited area surrounding the vacuum
pump.
Provide noise protection or
wear hearing protection.
NOTICE
EC conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
Following installation into a plant and before commissioning, the operator must check
the entire system for compliance with the valid EU directives and reassess it accord-
ingly.

Safety
7
2.4 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
●pumping of corrosive gases
●pumping of explosive media
●operation in potentially explosive areas
●operation of the pump with open vacuum or fore-vacuum flange open to the atmo-
sphere
●use of the vacuum pump to generate pressure
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●connection to units which have exposed voltage-carrying parts
●the evacuation of gases that may form adherent deposits or condensate in the suction
chamber

8
Transport and storage
3 Transport and storage
3.1 Transport
Fig. 1: Transporting the pump
Look for transportation damage when receiving the pump.
Use only a forklift to transport pump packed on pallet.
Unpack pump and undo screws on transport container.
Reuse the transport container of the vacuum pump.
– Transport or ship vacuum pumps in the original packing preferably.
Transport without
packaging
Remove the locking cap from the vacuum and fore-vacuum flange immediately before
connecting!
Lift the pump using lifting devices, and use only the ring bolts (threaded holes in the
vacuum flange) provided for that purpose on the top side of the pump.
To lift the pump with motor and if accessories are mounted, fit another strap at a suit-
able position.
Lift the pumping stations using the eyebolts provided on the frame or transport them
with a fork lift truck.
– For versions without a frame and eyebolts, use transport straps for lifting.
– Do not lift pumping station by the intake flange of the Roots pump.
3.2 Storage
The pumps of standard design are not provided with a corrosion protection. Therefore a
special corrosion protection should be provided by the customer and agreed with the
manufacturer for longer storage. Otherwise should be proceeded as follows.
Check that all the openings on the pump are securely closed.
WARNING
Danger from falling and swinging loads!
When lifting the pump there is a danger of falling parts.
Make sure that there are no persons under the suspended load.
Close off and supervise the area under the pump.

Transport and storage
9
Store the pump only indoors, preferably at temperatures between -10 °C and +40 °C.
– In rooms with moist or aggressive atmospheres, the pump must be airproof shrink-
wrapped in a plastic bag together with a bag of desiccant.
– After storage periods longer than two years, it is recommended to carry out main-
tenance and change the lubricant before using the pump.

10
Product description
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available.
●Pump model and model number
●Serial number
●Type and quantity of the lubricant
●Max. allowable pump speed
For motor-specific data, please see the separately installed motor rating plate.
Fig. 2: Product identification on the rating plate
Scope of delivery ●Pump with motor/without motor
●O-rings for the connection flanges
●Protective cover for the connection flanges
●Two eye bolts to lift the pump
●Lubricant (only for standard pump)
●Operating instructions
●Set of screws for the connection flanges
Mod.: Okta _ _ _ _G Ser.- No.: 3454440
Weight: 125
3
2
D-35641 Asslar
Made in Germany
Mod.-No.: PP G.. ...
N: 3600 Oil : P3 1.51/min
m /h
l
kg
S(N ): 490

Product description
11
Pump types
Pump features
4.2 Function
The vacuum pumps in the OktaLineTM series operate according to the Roots principle.
Two rolling pistons which are coupled by a pair of gears counter-rotate and roll in the
housing in opposite directions to each other without touching. The gas circulation-
cooled Roots pumps in the "G/GM" series differ from the non-cooled pumps in the Ok-
taLineTM series in that they can be operated without backing pumps. As individual pumps
they can be used in the pressure range from 130 bis 1013 hPa. By connecting two pumps
in series, the ultimate pressure can be lowered to 20 to 30 hPa. The achievable ultimate
pressure can be reduced right down to medium vacuum range in combination with fur-
ther Roots pumps. The pumping direction of the pumps is vertical from top to bottom, so
that any accumulating fluids cannot become deposited in the pump housing.
Pump type Pump designs
Standard version Pump in standard version:
●Standard motor
●Connection flanges are designed as ISO, DIN or ANSI flanges
●Connections for sealing gas inlet
●Shaft sealed with radial shaft seal ring (RSSR)
●Version with magnetic coupling (only M series)
Special versions Changes to the standard design
●Shaft sealed with a mechanical seal
●Version with gas cooler
●Special seal materials which are resistant to aggressive media
●Coated pump interior for corrosion protection and/or good anti-sticking prop-
erties
●Special housing and piston materials (e.g. stainless steel)
●Particularly pressure-resistant version (10000 hPa) in which the pressurised
components are made of spheroidal graphite iron castings
Flange model Okta 1500 GM Vacuum flange/ Fore-vacuum flange Cooling gas connection Measuring connection, intake side Measuring connection, pressure side Sealing gas connection
Ansi (150 lbs) 6" 4 " 4x G 3/8" 4x G 3/8" 4x G 3/8"
DIN DN 150 PN 10 DN 100 PN 10 4x G 3/8" 4x G 3/8" 4x G 3/8"
DIN ISO NW 160 ISO-F NW 100 ISO-F 4x G 3/8" 4x G 3/8" 4x G 3/8"

12
Product description
Fig. 3: Roots pump Okta 1500 G
Fig. 4: Roots pump Okta 1500 GM (with magnetic coupling)
1 Vacuum flange
1.1 Measuring con-
nection
2 Fore-vacuum
flange
5 Connection for oiler for version with
radial shaft seal or connection for
sealing medium for version with axial
face seal
6 Sealing gas connection
7 Cooling gas connection
100 Sight glass
335 Lubricant filler screw (2x)
335.1 Lubricant drain screw (2x)
1 Vacuum flange
1.1 Measuring connection
2 Fore-vacuum flange
6 Sealing gas connection
7 Cooling gas connection
100 Sight glass
335 Lubricant filler screw (2x)
335.1 Lubricant drain screw (2x)
335
335
1
1.1
7
2
6
6
100
335.1
5
M
M
SG
SG
V
335
335
1
1.1
72
6
6
100
335.1
SG
SG
M
V

Product description
13
Fig. 5: Scheme with gas cooler and cold gas circulation pipe
Cooling (option) The (usually) water-cooled gas cooler must be positioned at the gas outlet port of the
pump. In addition, the pump temperature needs to be monitored by a thermostat, which
switches off the pump, if the preset temperature limit is exceeded (e.g. due to failure of
the cooling water system).
Shaft sealing The drive shaft feedthrough can be fitted with radial shaft seal rings or mechanical seals.
Radial shaft seal ring (RSSR)
This form of shaft seal is equipped with an FPM radial shaft seal ring and is used on stan-
dard pump versions. Alternatively, depending on the process medium the inner radial
shaft seal ring can also be made of PTFE. In this case the housing seals of the pump are
also equipped with PTFE covered O-rings.
Mechanical seal
Further improvements in terms of sealing - which may be necessary when pumping ag-
gressive media - can be achieved with the aid of mechanical seals. Mechanical seals are
seals for fluids which require a supply of a sealant and a coolant which are neutral in
terms of the material being pumped. They also provide a sealing pressure up to
10000 hPa.
Magnetic coupling
The version with magnetic coupling has as an alternative to conventional shaft
feedthrough a static seal towards the outside.
4.3 Range of application
Thanks to a forced gas recirculation system the heat of the gas is dissipated by the gas
cooler directly after it runs through the compression and discharge phase. This allows
the pump to be used under operating conditions, which would not be possible with nor-
mal Roots pumps.
1 Vacuum flange
2 Fore-vacuum flange
7 Cooling gas connection
8 Suction chamber
9 Gas cooler
19 Main rotor
20 Slave rotor
1
19
7
7
8
20
2
9

14
Installation
5 Installation
5.1 Setting up the pump
When installing the pump, observe the following conditions:
Always place the pump on a firm, even surface.
– Check the load-bearing capacity of the floor at the installation location.
– The vacuum flange serves as the reference surface.
– A drilled hole is provided on each foot for attachment to the mounting surface. Do
not distort the pump when screwing on.
When installing the pump in a closed housing, ensure there is sufficient air circulation.
– Both sight glasses must be visible and accessible for inspection and maintenance
purposes.
– Voltage and frequency information given on the motor rating plate must be visible.
Where stationary installation is involved, anchor the pump on site.
Fill up with lubricant before operating the first time (see p. 14, chap. 5.2).
– Amount and type according to rating plate
Installation
conditions
The vacuum pump must be installed and operated under the following ambient condi-
tions:
5.2 Filling with lubricant
The type and amount of lubricant is visible on the pump's rating plate for each vacuum
pump. Generally only the lubricant used during initial assembly can be used later on.
Permissible operating fluids
●P3 (Standard operating fluid)
●F5 (Operating fluid for corrosive gas versions)
●D1 (for special applications e. g. higher operating temperature)
– Ultimate pressure of measurement, depending on the type of gas: < 5 ·10-2 hPa
kg
CAUTION
Loss of stability!
Risk of injury due to the pump's tipping towards motor as long as the pump is not fas-
tened to the base.
Secure pump with suitable lifting device on motor side.
Wear safety shoes with steel toe cap according to directive EN 347.
Installation location Inside; must however be protected against dust deposits
Outside; must however be protected against direct weather influ-
ences
Permissible ambient temperature
range
+5 °C ... +40 °C
Relative humidity Max. 85 %
Installation altitude Max. 2000 m above m.s.l., the rated power of the motor is re-
duced by approx. 10 % for installation altitudes > 1000 m and an
ambient temperature of 40 °C
Power connections according to voltage and frequency information given on the mo-
tor rating plate

Installation
15
Filling with lubricant Unscrew lubricant filler screws 335.
Fill gear chamber and bearing chamber (on the drive side) with lubricant.
– Fill level on initial fill: approx. 5 mm above the middle of the sight glass.
Fig. 6: Filling with lubricant
Screw in lubricant filler screws 335.
Check lubricant level when the pump is running at operating temperature in final vac-
uum:
– Fill level during operation: as per the sight glass image.
– Check fill level during continuous operation on a daily basis, otherwise each time
the pump is switched on. To add lubricant, switch off the pump and vent it to atmo-
spheric pressure.
Filling the sealing oil
chamber (versions
with RSSR only)
The shaft feedthrough of the drive shaft is sealed with sealing oil-covered radial shaft
seals, and is fed by an oiler on the shaft sealing housing. The type of sealing oil is the
same as the lubricant.
Fill up oiler to halfway with lubricant.
– Oiler 47 should always be filled to a max. of halfway (when the pump is cold); top
up as required.
NOTICE
Use approved operating fluids only!
The use of operating fluids that have not been approved by Pfeiffer Vacuum shall result
in a limited warranty. In such cases, it is not possible to guarantee that product-specific
performance data will be achieved.
Prior consultation is required before using other application-specific operating fluids.
max.
min.
335
335
335.1
335.2
335.1
WARNING
Toxic vapours!
Danger of poisoning when igniting and heating synthetic operating fluids (e.g. F4/F5)
above 300 °C.
Observe the application instructions.
Do not allow operating fluid to make contact with tobacco products; observe safety
precautions when handling chemicals.

16
Installation
Adding sealant for
the mechanical seal
(versions with MS
only)
When using a mechanical seal (optional), a cooling of the sealing surfaces is required.
The sealant reservoir needs to be attached above the shaft feedthrough on the outside
of the pump, on the base frame or in a different suitable location depending on the actual
conditions. The mechanical seal is capable of bridging a certain pipe resistance through
its own pumping effect. If the supply of sealant is no longer guaranteed, an additional cir-
culation pump must be installed. The pipes and the sealant reservoir are not contained
in the scope of supply.
During assembly of the sealant reservoir observe the installation instructions supplied
by the manufacturer.
Use the sealant in accordance with the manufacturer's instructions.
Cooling the mechanical seal
The ambient temperatures to which the pump is exposed will vary depending on the lo-
cation in which it is being used. If the cooling of the sealant (max. +90 °C) is not sufficient
for the amount of heat radiated at the sealant reservoir, then an additional water cooling
system (25) will need to be connected.
Fig. 7: Sealant reservoir for cooling the mechanical seal
The lubricant expands when the pump heats up, which could cause lubricant to
leak if the oiler is overfilled.
24 Sealant reservoir
25 Cooling water connection
26 Sealant drain
27 Sight glass
28 Sealant filler socket
30.1 Sealant circuit, supply line
30.2 Sealant circuit, return line
33 Blank screw coupling
125 Shaft sealing housing
130 Cover
335.1 Lubricant drain screw
28
30.2
30.1 125/
130
26
33
335.1
24
p
25
27

Installation
17
5.3 Connecting the vacuum side
The connection between the pump and the vacuum chamber should be kept as short
as possible and should have at least the nominal diameter of the pump flange. Use a
greater nominal diameter on line lengths > 5 m.
Piping to the pump must be suspended or supported.
– Physical forces from the piping system must not be allowed to act on vacuum
pumps.
Clear welded lines of any welding scales, loose parts etc. before installation.
5.4 Connecting the fore-vacuum side
Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the Roots pump’s exhaust flange.
Lay the pipes in such a way that the Roots or backing pump will not be subjected to
any mechanical tension.
– Suspension components should be integrated into the piping.
– Ensure that mating flanges are in a parallel position.
Lay piping from the pump sloping downward so that no condensate can flow back into
the pump; otherwise fit a condensate separator.
– If an air trap is created in the system, then a device for draining condensation water
must be provided at the lowest point.
WARNING
Exposed, rotating rolling pistons!
Fingers and hands can become crushed when the intake flange is open.
Keep all body parts out of operating range of the rolling pistons.
Use a wooden handle to rotate the rolling pistons during cleaning.
NOTICE
Danger of intake of solid particles!
Even in clean processes, fouling from the system must be anticipated during initial com-
missioning.
Use a suitable start-up strainer at the intake connection (see accessories).
Ensure that this strainer is only removed when the risk of solid particles entering the
pump can be excluded.
Note loss of pumping speed if necessary.
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to health
and/or can pollute the environment, depending on the particular application.
Comply with the applicable regulations when working with toxic substances.
Only officially approved filter systems may be used to separate and remove these
substances.

18
Installation
5.5 Connecting a gas cooler (optional)
The chosen gas cooler must be suitable for the location in which the device is used and
must be matched to the requirements of the process. Depending on the medium being
pumped, gas coolers made of standard steel or stainless steel can be used. These can
be adapted by the operator or ordered from Pfeiffer Vacuum. The dimensioning of the
cold gas recirculation line (7.1) should also be matched to the gas cooler and the pump.
Assembly
Fig. 8: Pump with tubular gas cooler
Connect the gas cooler (9) with flange (9.1) to the fore-vacuum flange (2) of the pump.
Check that the seal is correctly positioned.
Route the cold gas recirculation lines (7.1 ) from the gas cooler (9) to the flanges of
the cooling gas connections (7); in doing so, make sure that the connections are not
subjected to mechanical stress.
Choose the cross-section of the cold gas circulation pipe to be at least the size of the
nominal connection diameter.
5.6 Connecting the cooling water
If a gas cooler is used then a cooling water control valve (17) should be used at the cool-
ing water inlet of the gas cooler. Use of this control valve will reduce the consumption of
cooling water and keep the pump at the required operating temperature.
Requirements for the cooling water
The cooling water must be filtered in all cases. This keeps dirt deposits and organic sus-
pended particles that could accelerate pitting out of the cooling circuit. Complying with
the following requirements for cooling water will prevent corrosion damage:
1 Vacuum flange
2 Fore-vacuum flange
2.1 Temperature monitoring
(option)
7 Cooling gas connection
7.1 Cold gas circulation line
7.2 Measuring connection
9 Gas cooler
9.1 Flange, gas cooler
10 Cooling water, inlet
11 Cooling water, outlet
13 Exhaust connection (pres-
sure side)
M1 Measuring connection
(option)
1
7
9
9.1
2
2.1
M1
11
10
7. 2
7. 1
13
Okta ___G
Requirements for the cooling water
Water filtered, mechanically pure, optically clear, no turbidity, no sediments, chem-
ically neutral

Installation
19
Connecting the cool-
ing water
The connection should be made in a way that the flow can be visually checked. The best
method is the free outflow of cooling water via a funnel. If this is not possible because
there is no height difference, a flow indicator must be integrated into the line. Standard
flow monitors or flow indicators may be used.
Connect the cooling water lines:
– Cooling water inlet (10).
– Cooling water outlet (11); must be pressure-free.
Fig. 9: Cooling water connection at the gas cooler
Min. oxygen content 4 mg/kg
Max. chloride content 100 mg/kg
Max. carbonate hardness for the water temperatures
15 ... 25 °C
30 ... 40 °C
10 ° dH
6° dH
Max. potassium permanganate usage
pH value
10 mg/kg
7 ... 9
Aggressive carbon dioxide and ammonia must not be detectable
Max. electrical conductivity 500 μS/cm
Max. impurity particle size 25 μm
Permitted inlet overpressure range; if the pressure is higher a pressure reducer
valve must be integrated
2000 ... 6000 hPa
Permitted cooling water temperature range 10 ... 30 °C
Requirements for the cooling water
M1 Measuring connection
7.2 Measuring connection
9 Gas cooler
10 Cooling water, inlet
10.1 Dirt trap
10.2 Pressure switch
11 Cooling water, outlet
17 Cooling water regulating valve
17.1 Temperature sensor
7.2
10
10.1
17
10
M1
TS+
10.2
p+
11
9
V
7.2
17.1

20
Installation
Installing the pres-
sure monitor (op-
tional)
The pumps can be effectively protected against failure of the cooling water system by
installing a cooling water pressure monitor.
Assembly
Refer to the installation instructions provided by the manufacturer.
Set switching pressures; set pressure as excess gauge pressure relative to atmo-
spheric pressure:
– minimum: 300 hPa
– maximum:10000 hPa
5.7 Temperature monitoring (option)
In order to protect the pump against thermal overload, a G 3/8" thread for connection of
a temperature monitor is provided at the fore-vacuum flange (2) of the pump. We recom-
mend the use of a double thermostat or a PT-100 temperature sensor. The temperature
at the high-pressure connection piece (2.1) of the pump must not exceed 120 °C.