Gardner Denver WELCH CRVpro Series User manual

Operation Manual (EN)
Original version of the operation manual
Rotary vane pumps
Two-stage
Series CRVpro
CRVpro 48
CRVpro 65
P1700040
2020-06-12
P1700011
2020-06-12

EMEA
Gardner Denver Thomas GmbH
Am Vogelherd 20
98693 Ilmenau
Germany
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.welchvacuum.de
America
Gardner Denver Thomas Inc.
1601 Feehanville Drive
Suite 550
Mt. Prospect, IL 60056
USA
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.welchvacuum.com
Asia Pacific
Gardner Denver
Room 2206, Qiangsheng Mansion
No. 145 Pujian Road
200127 Shanghai
China
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.welchvacuum.com
Global Headquarters
Gardner Denver Thomas GmbH
Livry-Gargan-Str. 10
82256 Fürstenfeldbruck
Germany
We are constantly working on the
further development of all our product
types. Reprinting or reproduction of this
manual, including extracts, is not
allowed without the prior written
permission of Co. Gardner Denver
Thomas GmbH.
All rights under the copyright laws are
expressly reserved by Co. Gardner
Denver Thomas GmbH.
We reserve the right to make changes
and amendments.

Contents
P1700040 I
Contents
1Important Information.......................................................................................................................1
1.1 Meaning of the Warning and Information notes .....................................................................1
1.2 General Information................................................................................................................1
1.3 Target Groups ........................................................................................................................2
1.4 Intended Use ..........................................................................................................................2
1.5 Use for an Unauthorized Purpose..........................................................................................2
1.6 Product Standards, Safety Regulations .................................................................................3
2Basic Safety Instructions .................................................................................................................4
2.1 General Information................................................................................................................4
2.2 Electricity................................................................................................................................4
2.3 Mechanical Systems...............................................................................................................4
2.4 Hazardous Substances ..........................................................................................................5
2.5 High Temperatures.................................................................................................................5
3Description.........................................................................................................................................6
3.1 Design.....................................................................................................................................6
3.2 Area of Application .................................................................................................................6
3.3 Scope of Delivery ...................................................................................................................6
3.4 Function..................................................................................................................................8
3.4.1 Principles of Vacuum Pump Operation ..................................................................................8
3.4.2 Working Principle of Rotary vane pumps...............................................................................8
3.4.3 Working Principle of Two-Stage Rotary vane pumps (CRVpro Series).................................8
3.4.4 Oil Functions.........................................................................................................................10
3.4.5 Pump Lubrication..................................................................................................................10
3.4.6 Exhaust Filter........................................................................................................................10
3.4.7 Gas Ballast ...........................................................................................................................10
4Technical Data.................................................................................................................................12
4.1 Dimensions...........................................................................................................................12
4.2 Pumping Speed / Intake Pressure –Diagram......................................................................12
4.3 Device Data..........................................................................................................................13
4.4 Motor Data............................................................................................................................13
4.5 Lubrication Data ...................................................................................................................14
4.6 Order Numbers of Models....................................................................................................14
5Installation and Operation..............................................................................................................15
5.1 Unpacking.............................................................................................................................15
5.2 Pump Mounting ....................................................................................................................15
5.3 Pump Location / Environmental Conditions .........................................................................15
5.4 General References .............................................................................................................16
5.5 Installation and Connection..................................................................................................16
5.5.1 Connection to the Electric Service .......................................................................................17
5.5.2 Installation of the Grounding Plug ........................................................................................18

Contents
II P1700040
5.5.3 Change the Voltage Setting................................................................................................. 19
5.5.4 Motor Protection................................................................................................................... 19
5.6 Starting-up ........................................................................................................................... 21
5.7 Operating Temperature ....................................................................................................... 21
5.8 Oil for Drawing off Oxygen................................................................................................... 22
5.9 Gas Ballast Control.............................................................................................................. 22
5.10 Trap installation and maintenance....................................................................................... 22
5.11 Side Panel Fitting Port......................................................................................................... 23
5.12 Closing down ....................................................................................................................... 23
5.13 Storage ................................................................................................................................ 24
5.14 Transport.............................................................................................................................. 24
5.15 Scrap Disposal..................................................................................................................... 24
6Maintenance and Servicing........................................................................................................... 25
6.1 Oil Level Control .................................................................................................................. 25
6.2 Oil Colour Check.................................................................................................................. 26
6.3 Oil Change........................................................................................................................... 26
6.3.1 Draining the Oil.................................................................................................................... 26
6.3.2 Filling up with Oil.................................................................................................................. 27
6.3.3 Flushing ............................................................................................................................... 27
6.3.4 Frequency of Oil Changes................................................................................................... 28
6.4 Shaft Seal Replacement...................................................................................................... 28
6.5 Major Factory Repair ........................................................................................................... 28
7Troubleshooting ............................................................................................................................. 29
8Overview of Accessories............................................................................................................... 31
8.1 Overview and Order Numbers for EMEA, Asia ................................................................... 31
8.2 Overview and Order Numbers for Americas........................................................................ 31
8.3 32
8.4 Sorption trap ADT................................................................................................................ 32
9Overview of Spare Parts ................................................................................................................ 32
9.1 Fastening Kit........................................................................................................................ 33
9.2 Seal Kit................................................................................................................................. 34
9.3 Lip Seal Kit........................................................................................................................... 34
9.4 Oil Drain Valve Kit................................................................................................................ 35
9.5 Service Kit............................................................................................................................ 35
9.6 Side Panel Fitting Kit ........................................................................................................... 36
9.7 List of Spare Parts ............................................................................................................... 37
10 Warranty .......................................................................................................................................... 41
11 EC Declaration ................................................................................................................................ 42
12 Global Contact ................................................................................................................................ 43
13 43

Important Information
P1700040 1
1 Important Information
1.1 Meaning of the Warning and Information notes
Take note of the warning notes which are in the following boxes:
CAUTION! / WARNING!
Hazard which may lead to serious injuries or material damage.
WARNING!
Hot surface which may lead to serious injuries or material damage.
Information which are only relevant of CE operation are marked in following boxes:
ONLY RELEVANT FOR CE (230-240)/(380-420)V；
(200/346)V / 50HZ OPERATION
Only relevant for CE (230-240)/(380-420)V；（200/346）/ 50Hz operation
Information which are only relevant of UL operation are marked in following boxes:
For
UL
ONLY RELEVANT FOR UL (240-265)/(415-
460)(200/346)V / 60HZ OPERATION
Only relevant for UL (240-265)/(415-460)V；（200/346V）/ 60Hz operation
1.2 General Information
CAUTION!
IMPORTANT SAFETY INSTRUCTIONS - SAVE THESE INSTRUCTIONS
To reduce the risks of fire or explosion, electrical shock, and the injury to persons,
read and understand all instructions included in this manual. Be familiar with the
controls and the proper usage of the equipment.
The CE/UL sign is located on the rating plate. Observe the binding national and local regulations when
fitting the pump into installations!
Note: The English version is the original version of the operation manual.

Important Information
2 P1700040
Our products are sold worldwide and can therefore be equipped with the typical national plugs and for
the various voltages.
ONLY RELEVANT FOR CE (230-240)/(380-420)V；
(200/346)V / 50HZ OPERATION
The rotary vane pump conforms to the following directives:
2006/42/EC
Directive on machinery
2012/19/EU
Directive on waste electrical and electronic equipment
2011/65/EU
Directive on the restriction of the use of certain hazardous substances in
electrical and electronic equipment
1.3 Target Groups
This operating manual is intended for the personnel planning, operating and maintaining standard,
two-stage, Rotary vane pumps.
This group of people includes:
Designers and fitters of vacuum apparatus
Employees working on commercial laboratory and industrial vacuum technology
applications
Service personnel for Rotary vane pumps
The personnel operating and maintaining the Rotary vane pumps must have the technical competence
required to perform the work that has to be done and understand the hazards involved. The user must
authorize the operating personnel to do the work that has to be done. The personnel must have read
and understood the complete operating manual before using the Rotary vane pumps.
The operating manual must be kept at the place of use and be available to the personnel when
required.
1.4 Intended Use
The layout of the rotary vane pump must be appropriate for the conditions of use. The user bears the
sole responsibility for this.
The rotary vane pump may only be operated under the conditions stated:
in the “Technical Data” chapter
on the type plate and
in the technical specification for the order concerned
1.5 Use for an Unauthorized Purpose
It is forbidden to use the pump for applications deviating from the technical data stated on the type
plate, in the operating manual or the conditions stated in the supply contract, or to operate it with
missing or defective protective devices.
The CRVpro standard pumps are not suited for pumping liquids.

Important Information
P1700040 3
1.6 Product Standards, Safety Regulations
ONLY RELEVANT FOR CE (230-240)/(380-420)V；
（200/346）V /50HZ OPERATION
The rotary vane pump meets the following product standards:
EN 60204-1
Safety of machinery - Electrical equipment of machines -
Part 1: General requirements
Observe the standards and regulations applying in your country when you use the rotary vane pump.

Basic Safety Instructions
4 P1700040
2 Basic Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
2.1 General Information
CAUTION!
To reduce the risks of fire or explosion, electrical shock, and the injury to persons,
read and understand all instructions included in this manual. Be familiar with the
controls and the proper usage of the equipment
Warning notices must be observed. Disregarding them may lead to damage to
health and property.
The Rotary vane pumps must be operated by personnel who can detect impending
dangers and take action to prevent them from materializing.
The Rotary vane pumps is intended for indoor use only.
The manufacturer or authorized workshops will only service or maintain the rotary
vane pump if it is accompanied by a fully completed damage report. Precise
information about the contamination (also negative information if necessary) and
thorough cleaning of the rotary vane pump are legally binding parts of the contract.
Contaminated Rotary vane pumps and their individual parts must be disposed of in
accordance with the legal regulations. The local regulations apply in foreign
countries.
2.2 Electricity
Please note the following when connecting to the electrical power supply system:
The electrical power supply system must have a protective connector according to IEC
60364-4-41 (for CE operation only).
CRVpro48+65 are supplied with PTC embedded three phase motor but without accessories
for electrical connection. They must be connected via the appropriate cable and a suitable
motor protection switch or PTC module to protect the motor from overheating in some
emergency cases.
Set the switch in according with the rating on the motor nameplate.
After connecting the motor and after every time you alter the wiring, check the direction of
rotation. To do so, briefly switch on the power and check whether a suitable cover (e.g. a
blank flange) is sucked on at the intake port. If not, interchange two phases of the
connection. Observe the direction arrow on the motor adapter.
The protective connector should not have any breaks.
The connecting cable should not be damaged.
2.3 Mechanical Systems
Improper use can lead to injuries or material damage. Observe the following instructions:
Only operate the Rotary vane pumps with the specified flange-mounting components.
Hazardous substances must be separated out as far as this is technically possible before
they reach the pump.

Basic Safety Instructions
P1700040 5
External mechanical stresses and vibrations must not be transmitted to the pump. Only use
flexible vacuum hoses for connecting Rotary vane pumps.
The pump should not be used to suck up fluids. Lay the exhaust pipe so that it slopes
downwards, so allowing condensate to flow out of the pump. Collect the condensate and
dispose of it in an environmentally compatible manner.
Maintain a space of least 20 cm between the pump and adjacent parts in order to enable
the pump to cool.
CAUTION!
Solid particles in the pumping medium impair the pumping action and can lead to
damage. Prevent solid particles penetrating into the pump!
2.4 Hazardous Substances
CAUTION!
The operating company bears the responsibility for the use of the rotary vane pump.
Hazardous substances in the gases to be pumped can cause personal injuries and property damage.
Pay attention to the warning notices for handling hazardous substances.
The local regulations apply in foreign countries.
Combustible and explosive Gases
Examine before switching on whether that can form gas combustible gas/air mixtures which can be
promoted! Consider the regulations of the guideline 1999/92/EC.
It is not permitted to pump gases that are combustible or prone to explosion.
Aggressive gases
The Rotary vane pumps are not certified according to ATEX directive 2014/34/EU.
Poisonous gases
Use a separator when pumping poisonous or harmful gases. Prevent such substances from leaking
out of the appliance or pump. Treat these substances according to the applicable environmental
protection regulations.
Test the strength and leak-tightness of the connecting lines and the connected apparatus. Prevent
environmental poisons, e.g. mercury, getting into the Rotary vane pumps.
2.5 High Temperatures
The rotary vane pump may heat up as a result of the temperature of the gas being pumped and
through intrinsic heating. In dependence on the operation mode, the casing temperature can reach
90 °C (motor). Prevent the following maximum permissible temperature from being exceeded.
+ 40 °C for the environment
The motor is protected against overload by a suitable protective device.

Description
6 P1700040
3 Description
3.1 Design
The CRVpro series vacuum pumps are oil-sealed, two-stage Rotary vane pumps.
The drive motor is directly flange-mounted onto the motor cover of the pump holder and the pump
shaft and the motor shaft are connected to each other by an elastic coupling.
The bearings of the interior pump body are force-fed lubricated sliding bearings.
1 -
SCREW-PLUG FOR OIL FILLING
2 -
EXHAUST PORT
3 -
OIL INSPECTION GLASS
4 -
TYPE PLATE
5 -
OIL DRAIN SCREW-PLUG
6 -
SUCTION PORT
7 -
ROTARY KNOB FOR SETTING THE
GAS BALLAST VALVE
8 -
GAS BALLAST AIR PORT
Fig. 1 Rotary vane pump (CRVpro 48+65)
3.2 Area of Application
The range of application of our oil-sealed Rotary vane pumps encompasses the entire field of vacuum
technology, both for use in the laboratory and in industry.
The task is to create an ultimate pressure of 10-3 mbar (ultimate pressure partial 10-4 mbar):
as a single vacuum pump
as a fore-vacuum pump for oil diffusion pumps or as turbomolecular pumps
The rotary vane pump can evacuate containers or vacuum installations up into the high vacuum
range.
WARNING!
The rotary vane pump must not be used for extracting explosive gases or vapours. The
rotary vane pump must not be operated in rooms which might contain explosive
gases.
3.3 Scope of Delivery

Description
P1700040 7
Followed the scope of delivery for standard model numbers. The scope of delivery for other model
numbers is specified in the supply contract.

Description
8 P1700040
3.4 Function
3.4.1 Principles of Vacuum Pump Operation
The main purpose of a vacuum pump is to reduce the pressure in a vessel or a closed system. The
degree of pressure reduction is dependent upon the requirements of the application and the type of
vacuum pump employed.
3.4.2 Working Principle of Rotary vane pumps
Pressure reduction in a closed system is accomplished by repeatedly removing a portion of the
original volume of gas contained in the system. Removal is performed by the action of the rotating
elements of the pump which cause a given space to be successfully enlarged and diminished. Figure
2 illustrates a chapter through a typical stage of rotary-vane pump. Note that this figure is not intended
to illustrate exactly the internal components of the pumps; its purpose is to illustrate the general
operating principles of vacuum pumps.
Fig. 2 Rotary vane pump Principle
The rotary action of the pump creates a hollow space of chamber (1) which expands as the pump
rotates. As the chamber expands, the pressure in the chamber decreases. As a result, gas is drawn
into the chamber due to the difference in pressure between the chamber and the inlet (4) to the
chamber (The inlet is the only place where gas can flow into the chamber). Once the vane (3) moves
past the inlet (4), it seals the inlet against the chamber (1) and the gas becomes trapped between the
vanes (2 and 3). The chamber (1) formed by the enclosed space between the vanes then begins to
decrease in volume as the rotor revolves, compressing the gas. The pressure of the compressed gas
becomes greater than atmospheric pressure. When the vane (2) moves past the exhaust port (5) the
compressed gas in the chamber is forced out through the exhaust port. This expansion/compression
cycle constitutes one complete cycle of the pump operation. This cycle is repeated as the vane (2)
passes the intake port and seals it against the atmosphere. Therefore, two pump cycles are performed
during each revolution of the pump rotor.
3.4.3 Working Principle of Two-Stage Rotary vane pumps (CRVpro Series)

Description
P1700040 9
Two pump stages (fore-stage and high-stage) are arranged in series in order to improve the end
pressure and the pumping speed at lower pressures. The intake takes place in the first stage (high-
stage), the compression and the outlet in the second stage (fore-stage).
Fig. 3 Pre-stage / high stage
When in operation, the intake stage is at lower pressure and the exhaust stage is at higher pressure
relative to each other. Each stage contains a rotor assembly consisting of a rotor with two vanes and a
stator. The two rotors are combined on one shaft, and the two stators are combined in a common
housing. The pump shaft turns the rotors, causing the vanes in each chapter to sweep the surface of
their stators. The vanes are pressed against the stators by centrifugal force. Each stage has an
exhaust valve. Gas expelled from the first stage exhaust passes through an inter stage port to the
intake of the second stage. The second stage compresses the gas further, then expels it from the
second stage exhaust valve to the atmosphere. The oil carried along with the gas is separated out by
a filter (available accessory).
An adjustable gas ballast valve is located in the pump’s exhaust stage. The purpose of the gas ballast
is to prevent vapours condensing in the vacuum pump. A dosed quantity of air (gas ballast) can be let
into the pump body during the compression by opening the gas ballast valve. The function of the gas
ballast valve is described more in detail in chapter 3.4.7 “Gas Ballast”.
Effects of Continued Pressure Reduction
The quantity of gas in the vessel (6) is reduced with each evacuation cycle. The gas remaining in the
vessel expands to fill the vessel and consequently with each cycle the pressure in the vessel is
reduced. This is a manifestation of Boyle’s Law which states that, for a constant temperature, the
volume of a body of gas is inversely proportional to its pressure; i.e., if the volume is enlarged the
pressure must be reduced.
As the amount of gas in the vessel is steadily diminished, its pressure is correspondingly reduced. The
action of the pump must therefore compress a successively smaller quantity of gas with each cycle to
something greater than atmospheric pressure in order to expel it from the pump.
At the beginning of an evacuation sequence, the compression ratio is very small. In the first cycle of
operation the pump draws in a volume of gas at atmospheric pressure and expels it at approximately
atmospheric pressure. Since the exhaust valve is generally spring loaded to provide a good seal, the
pressure required to open it is somewhat greater than atmospheric pressure.
Ultimate Pressure
As described previously, a quantity of gas is removed from the system with each cycle of the pump.
Therefore, the pressure of the gas remaining in the system is reduced with each pump cycle. Since
the pump can remove only a small portion of the gas with each pump cycle, it is obvious that this
method of evacuation can never completely remove all the gas in the vessel. In addition to this, all the
components of the system contain minute sources of gas leakage which are impossible to seal
completely against atmospheric pressure. Outgassing of materials within the system provide additional
sources of gas.
As a result, after prolonged pumping, a state of equilibrium is reached in which the gas introduced
from all the leakage sources is balanced by the ability of the pump to remove gas from the system.

Description
10 P1700040
This state of equilibrium is referred to as the ultimate pressure or blank off pressure of the pump and
its system. No matter how much additional pumping time is provided, no further reduction in system
pressure will be accomplished once ultimate pressure is attained.
Intake Anti-suck back Protection
When power to the pump is turned off, this device closes automatically, maintaining vacuum in the
system being evacuated, and vents the inside of the pump to atmospheric pressure.
3.4.4 Oil Functions
WARNING!
Vacuum pump is shipped without oil inside to prevent possible spillage during
shipment. Oil must be added prior to use!
The oil fulfils the following functions in the vacuum pump:
lubricating the sliding parts, such as rotor, vane, radial shaft seals
sealing the moving parts against the stator wall to reduce leaks
conducting the heat of compression to the metal walls (cooling)
The oil transports the polluted particles and corrosive media and thus effects continuous cleaning of
the internal surfaces.
3.4.5 Pump Lubrication
To ensure efficient operation and proper maintenance, and to minimize noise and oil vapours, it is
important to use the correct type and quantity of oil. Directorr™Premium vacuum oil has been
especially developed to have the proper viscosity, low vapour pressure, and chemical stability needed
to produce peak pumping efficiency. The ultimate vacuum guarantee on Welch pumps applies only
when this oil is used. Each pump is supplied with sufficient oil for filling. Additional oil is available. See
chapter 8 Overview of Accessories.
3.4.6 Exhaust Filter
Any oil-sealed vacuum pump tends to discharge oil mist from its exhaust port when the pump operates
under high-flow conditions, such as when the pump’s intake is at or near atmospheric pressure.
Typically, oil mist in the form of a white puff of “smoke” can be seen from the exhaust port when no
filter is used. Once the vacuum level and the corresponding air flow through the pump are reduced,
very little, if any, oil mist will be emitted. An exhaust filter is recommended for any vacuum pump
installation where the pump operates at high intake pressures for a prolonged period of time. Oil
droplets entrained in the pump’s exhaust are removed by the exhaust filter element. Use of an exhaust
filter typically reduces or baffles pump noise as well. Exhaust filters are sometimes referred to as oil
mist eliminators. See chapter 8 Overview of Accessories.
3.4.7 Gas Ballast
Condensates could have collected in the vacuum pump if:
the vacuum pump is new
it has not been used for long periods
the pump's maximum tolerance of water vapour pressure has been exceeded

Description
P1700040 11
When pumping condensable vapours, they may be compressed during the compression phase above
the saturated vapour pressure and condense.
This causes considerable deterioration in the vacuum pump’s performance:
ultimate pressure is not achieved
corrosion occurs
heavy oil contamination and formation of emulsions
CAUTION!
Operating with gas ballast increases the operating temperature of the vacuum pump
by 5 –10 K.
The gas ballast valve can increase the pump’s water vapour tolerance. In many vacuum pump
applications the gases being pumped from a system are a combination of permanent gases and
undesirable vapours such as water vapour. Under some conditions, the vapours condense in the
second stage of the pump and contaminate the oil. The gas ballast valve reduces oil contamination by
decreasing or eliminating vapour condensation.
Vapour condensation is most likely to take place when the gas compression ratio is high, i.e. when the
pump compresses a relatively large volume of gas to a small volume. Whether or not condensation
takes place is dependent upon several factors, including the proportion of permanent gases to
vapours at the pump intake. If the gases being pumped consist entirely of vapours, condensation will
definitely occur unless the gas ballast valve is opened. The gas ballast valve adds a small amount of
air at atmospheric pressure to the gas being compressed in the second stage. This reduces the
compression required to push the gas out past the exhaust valve (less reduction in volume is
required), and therefore reduces or eliminates condensation.
When the gas ballast valve is open, the pump has to work a little harder, resulting in a slight increase
in operating temperature. The increase in temperature is small, however, and is not harmful to the
pump. Also, the pump is slightly noisier, and the pump’s ultimate pressure is somewhat reduced.
Therefore, the gas ballast valve should be kept closed when it is not needed. Note that the gas ballast
is not equally effective on all different types of chemical vapours, so it may not always eliminate
condensation completely.
Should condensate form despite actuation of the gas ballast device, the suction port must be closed
and the pump operated with gas ballast for a lengthy period (about 2 hours).

Technical Data
12 P1700040
4 Technical Data
4.1 Dimensions
Fig. 4 Dimensions (in mm)
4.2 Pumping Speed / Intake Pressure –Diagram
Fig. 5 Pumping Speed / Intake Pressure (50Hz) - Diagram CRVpro 48+65

Technical Data
P1700040 13
4.3 Device Data
4.4 Motor Data
Parameter
Unit
3487T-xx
CRVpro 48
3657T-xx
CRVpro 65
Free Air Displacement (max. pumping
speed)
- @ 50Hz
m3/h (L/min)
55.7 (928.3)
74.3 (1238.3)
- @ 60Hz
CFM (L/min)
39.4 (1113.3)
52.5 (1486.7)
Pumping Speed
- @ 50Hz
m3/h (L/min)
48.0(800)
65.0(1083.3)
- @ 60Hz
CFM (L/min)
33.4(945)
44.8(1266.7)
Ultimate pressure (ISO21360)
- without gas ballast partial
mbar (Torr)
3×10-4 (2×10-4)
3×10-4 (2×10-4)
- without gas ballast total
mbar (Torr)
3×10-3 (2×10-3)
3×10-3 (2×10-3)
- with gas ballast total 1
mbar (Torr)
5×10-3 (4×10-3)
5×10-3 (4×10-3)
- with gas ballast total 2
mbar (Torr)
6×10-3 (5×10-3)
6×10-3 (5×10-3)
Max. inlet pressure
bar
1
1
Max. outlet pressure
bar
1.35
1.35
Connection flanges
DN
40 KF
40 KF
Ambient temperature
°C
10 - 40
10 - 40
Noise level (50Hz)
dB (A)
≤58
≤58
Noise level (60Hz)
dB (A)
≤60
≤60
Type of protection
IP55
IP55
Oil filling
l
4.9
4.3
Dimensions (W/D/H)
mm (inch)
796x262x369
(31.4x10.3x14.5)
796x262x369
(31.4x10.3x14.5)
Shipping Carton Dimensions (W/D/H)
mm (inch)
980x500x600
(38.6x19.7x23.6)
980x500x600
(38.6x19.7x23.6)
Weight
kg (lbs.)
99 (218)
100 (220)
Shipping Weight
kg (lbs.)
119 (262)
120 (264)
Parameter
Unit
50 Hz
60 Hz
Frequency
Hz
Frequency 50 Hz
Frequency 60 Hz (for
UL)
Low Voltage
V
230-240；200
240-265；200
High Voltage
V
380-420；346
415-460；346
Motor power
Kw
2.2
2.2
Nominal current (low voltage)
A
7.86-7.55；9.04
7.30-6.62；8.76
Nominal current (high voltage)
A
4.76-4.32；5.23
4.22-3.82；5.06
Motor speed 50/60Hz
rpm
1460
1760

Technical Data
14 P1700040
4.5 Lubrication Data
Welch Directorr™Premium vacuum oil is a triple-distilled hydrocarbon oil using severely hydro treated
base stock. The oil is designed to resist breakdown at higher RPMs and operating temperatures of
direct-drive vacuum pumps. The hydro treating virtually eliminates aromatics and sulphur to give good
resistance to sludge and varnish formation over time in corrosive environments. Directorr™Premium
vacuum oil enables Welch direct-drive vacuum pumps to maintain the highest vacuum performance
over time. The oil is light yellow.
The technical data and operating characteristics of Rotary vane pumps are only guaranteed if
original Welch Directorr™Premium vacuum oil is used!
4.6 Order Numbers of Models
Choose the configuration according to your needs:
Fig. 6 Order number configuration
Lubrication
Order number for customer located in Americas:
Description
Order no.
Order number for customer located in EMEA, Asia:
Description
Order no.
CAS No.
64742-65-0
Vapour Pressure (at 25°C)
1×10-6 mbar (1×10-6 Torr)
Viscosity (at 40°C)
65 cSt (305 SUS)
Specific Gravity
0.87
Directorr™Premium
vacuum oil:
1 quart
8995P-11
1 gallon
8995P-15
5 gallon
8995P-20
55 gallon
8995P-25
Directorr™Premium
vacuum oil:
1 litre
800995-01
5 litre
800995-05
10 litre
800995-10
20 litre
800995-20
200 litre
800995-200

Installation and Operation
P1700040 15
5 Installation and Operation
5.1 Unpacking
Carefully unpack the rotary vane pump. Keep all paperwork and inspection tags for future reference.
Check the pump for:
Transport damage
Conformity with the specifications of the supply contract (model, electrical supply
data)
Completeness of the delivery
Please inform us without delay if there are discrepancies between the delivery and the contractually
agreed scope of delivery, or if damage is detected.
Please take note of the general terms of business of the manufacturing firm.
In case of a claim under warranty, the device must be returned in packaging that is suitable for
protecting it during transport.
5.2 Pump Mounting
For more rigid mounting requirements the pump base can be bolted directly to a surface using the 2
mounting holes and 2 slots featured on the base.
Fig. 7 Pump mounting
5.3 Pump Location / Environmental Conditions
The pump should be located in a clean and well-ventilated area and adequate space should be
provided wherever possible for routine maintenance such as oil changes. For best performance, the
pump should be located as closely as possible to its system. Determining factors for pump location
should include length and size of connections, the number of bends, and the type of exhaust
connections.

Installation and Operation
16 P1700040
5.4 General References
CAUTION!
On continuous operation it’s recommended to run the pump below 10mbar maximum vacuum
pressure.
According to its intended use the capacity of the vacuum pump depends on:
the kind of assembly
accessories
the oil used
additional connections
vacuum piping system
In addition, fail-safe operation is determined by the mode of maintenance. Elements such as valves,
filters, condensers should be provided as early as in the conception. The materials of the vacuum
piping should be selected in such a way that they will be resistant to the media to be delivered!
5.5 Installation and Connection
1. Set the rotary vane pump on a flat and horizontal surface. If more rigid mounting is required,
bolt the pump base to the surface. See chapter 5.2 Pump Mounting.
2. Remove the clamping ring and the protection cap of the suction and exhaust ports.
3. Attach the vacuum connection to the suction port and the exhaust pipe on the exhaust port.
The suction and pressure ports must not be connected the wrong way round by mistake!
WARNING!
Never block or impede air flow from the exhaust port. High pressure can build up
within the oil reservoir if the exhaust port is blocked. Check frequently, especially if
exhaust is piped out of the building.
WARNING!
Consider the warning reference on the terminal box of the motor!
4. Recheck the oil level. If needed refill oil –see chapter 6.3.2 Filling up with Oil. Please note
that the pumps are delivered without oil filling. Initial oil filling must be done by the user.
5. Connect the rotary vane pump to the electrical supply. Please note the explanations on
chapter 5.5.1 Connection to the Electric S.
6. How to operate the pump see chapter 5.6 Starting-up.