Pfeiffer Vacuum UnoLine UNO 200 User manual

Betriebsanleitung • Operating Instructions
PD 0024 BE/F(0705)
UnoLine™
Rotary Vane Pumps
UNO 200
UNO 240
UNO 400
UNO 630

2
Table of contents
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 Proper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Transport and storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . 11
5.5 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.6 Install cooling water unit with thermal circuit breaker (option). . . . . 15
6 Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Before switching on the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.4 Switching off the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.1 Precaution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2 Changing the operating fluid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 Changing the operating fluid filter . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.4 Changing the exhaust filter in the operating fluid separator . . . . . . 23
7.5 Cleaning the operating fluid return line . . . . . . . . . . . . . . . . . . . . . . 26
7.6 Changing the intake filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.7 Changing the gas ballast filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.2 Re-starting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
12 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3
About this manual
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the func-
tioning of the designated product and provides the most important information for
safe use of the unit. The description follows applicable EU guidelines. All informa-
tion provided in this operating manual refer to the current state of the product's de-
velopment. The documentation 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.net.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.net
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating manuals are the result of risk
evaluations and hazard analyses and are oriented on international certification
standards 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:
UNO 200 ... UNO 630 Operating instructions
Safety information for vacuum pumps "Safety Guide" PT 0300 BN*
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
DANGER
Immediate danger
Death or very severe injuries occur.
WARNING
Possible danger
Death or injuries may occur.
CAUTION
Possible danger
Medium to slight injuries may occur.
NOTE
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
Piktograph
definitions
Instructions in the
text
ÎWork instruction: here you have to do something.
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Exhaust flange
Gas ballast valve
Power connection
Prohibition of an action or activity in connection with a
source of danger, 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 danger, the disregarding of which may result in
serious accidents.
Important information about a product, handling or
applicable part of the documentation to which special
attention should be paid.
☞
V
G

5
Safety
2 Safety
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 70 °C. Use suitable finger guards if necessary.
• When returning the pumps to us please note the instructions in the Service sec-
tion.
2.2 Proper use
• The vacuum pump may only be used to generate a vacuum.
• Installation, operating and maintenance regulations must be complied with.
• Using accessories not mentioned in this manual is not permitted without autho-
risation from Pfeiffer Vacuum.
2.3 Improper use
Improper use will cause all claims for liability and guarantees to be forfeited. Im-
proper use is deemed to be all use for purposes deviating from those mentioned
above, especially:
• Pumping of corrosive gases.
• Pumping of explosive media.
• Operation of the pump in potentially explosive areas.
• Pumping of gases containing impurities such as particles, dusts and condensate;
note the vapour compatibility levels of the pump.
• Pumping of substances that tend to sublime.
• Use of the vacuum pump to generate pressure.
• Pumping of liquids.
• The use of operating fluids not specified by Pfeiffer Vacuum.
• Connection to pumps or units which are not suitable for this purpose according
to their operating instructions.
• Connection to units which have touchable and voltage carrying parts.
NOTE
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.
ÎAbsolute observe the safety information for vacuum pumps (PT 0300 BN) !
ÎThe operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
NOTE
CE conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
ÎFollowing installation into a plant and before commissioning, the operator must
check the entire system for compliance with the valid EU directives and reassess it
accordingly.

6
Transport and storage
3 Transport and storage
3.1 Transport
Transport instructions
ÎRemove the locking cap from the vacuum flange immediately before connec-
ting!
– Check the protective strainer, paying attention to the o-ring.
ÎUse only the crane eye sideways at the operating fluid separator to lift the pump.
Fig. 1: Transporting the pump
3.2 Storage
ÎCheck that all the openings on the pump are securely closed.
ÎStore the pump in a cool, dry place; preferably at room temperature (approx.
20°C).
– For a longer period of storage, seal the pump in a PE bag with drying agents
enclosed.
– For a period of storage longer than one year, it is recommended to carry out
maintenance and change the operating fluid.

7
Product description
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, al-
ways have the information from the rating plate available and use it:
• Pump model and model number
• Serial number
• Type and amount of operating fluid
• Date of manufacture
Please find the voltage range and motor-related data on the separately attached
motor rating plate.
Scope of delivery • Pump with motor and power cord (only for pumps with single phase motor)
• Operating fluid D1 (for standard pump)
• Centering ring with O-ring
• Locking cap for vacuum flange
• Operating instructions
Differences between
the pump types Pump type Pump versions
UNO 200
Standard version of pump
• Operating fluid return system with float valve
• Operating fluid cooler; cooling water unit (option)
UNO 240
Standard version of pump
• Betriebsmittelrückführung mit Schwimmerventil
• perating fluid cooler; cooling water unit (option)
UNO 400
Standard version of pump
• Betriebsmittelrückführung mit Schwimmerventil
• perating fluid cooler; cooling water unit (option)
UNO 630
Standard version of pump
• Betriebsmittelrückführung mit Schwimmerventil
• perating fluid cooler with van; cooling water unit (option)

8
Product description
4.2 Function
The UnoLine™ series pumps are oil-sealed, single stage operating rotary vane
pumps with air cooling and circulatory lubrication. A vacuum safety valve in the
intake flange closes the intake line automatically and prevents operating fluid back-
streaming when the pump is switched off. The outlet is via an operating fluid sep-
arator (ONF) with integrated oil mist filter. In addition there is an oil filter in the op-
erating fluid separator cleans the operating fluid (dependent on the pump model).
The pumps are appropriate for operations in process technology in the food pro-
cessing, and packing industries and the metallurgical field.
The pumps can also be used for the purpose of generating centralized vacuum in
hospitals. The standard UnoLine™ pumps have been designed for non-stop or in-
termittent operations.
Fig. 2: UNO 200
Fig. 3: UNO 240
1 Vacuum flange
2 Exhaust flange
6 Pump casing
74 Gas ballast valve
74.4 Gas ballast filter
75 Operating fluid separator
80 Sight glass
140 Operating fluid filler
screw
250 Motor
280 Operating fluid cooler
290 Operating fluid return
unit
1 Vacuum flange
2 Exhaust flange
6 Pump casing
74 Gas ballast valve
74.4 Gas ballast filter
75 Operating fluid separator
80 Sight glass
140 Operating fluid filler
screw
250 Motor
280 Operating fluid cooler
290 Operating fluid return
unit
2 75 74.4 74 140 8 1 250
80 290 6 280
2 75 74.4 74 140 8 1 250
80 290 280 6

9
Installation
Fig. 4: UNO 400
Fig. 5: UNO 630
5 Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
• Note the load-bearing capacity of the mounting surface.
• Maximum installation altitude 2000 m (above mean sea level)
• Permissible ambient temperature: +12 ... +40°C
• Maximum relative humidity 85%
ÎFill up with operating fluid before operating the first time (see p. 14, chap. 5.5).
– Amount and type according to rating plate
ÎAlways place the pump on a firm, even surface.
– Where stationary installation is involved, anchor the pump on site.
1 Vacuum flange
2 Exhaust flange
6 Pump casing
74 Gas ballast valve
74.4 Gas ballast filter
75 Operating fluid separator
80 Sight glass
140 Operating fluid filler
screw
250 Motor
280 Operating fluid cooler
290 Operating fluid return
unit
1 Vacuum flange
2 Exhaust flange
6 Pump casing
74 Gas ballast valve
74.4 Gas ballast filter
75 Operating fluid separator
80 Sight glass
140 Operating fluid filler
screw
250 Motor
280 Operating fluid cooler
290 Operating fluid return
unit
2 75 74.4 140 74 8 1 250
80 280 290 6

10
Installation
ÎWhen installing the pump in a closed housing, ensure there is sufficient air cir-
culation.
– Sightglass and gas ballast valve must be visible and readily accessible.
– Voltage and frequency information given on the motor rating plate must be
visible.
5.2 Connecting the vacuum side
ÎBefore attaching the piping at the vacuum flange remove locking cap and insert
protective strainer with the respective O-ring.
ÎThe connection between the pump and the recipient should be kept as short as
possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange
connections.
– Separators, filters etc. may be installed upstream to protect the pump (see ac-
cessories). However, please observe the loss of pumping capacity due to the
conductivity of the accessories.
5.3 Connecting the exhaust side
ÎChoose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
ÎPiping to the pump must be suspended or supported.
– Forces from the piping system must not be allowed to act on vacuum pumps.
ÎLay 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.
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
ÎInstall the line without shut-off valves on the exhaust side.
ÎIf there is danger of a build-up of excess pressure (> 1500 mbar abs.) in the lines,
observe all official accident prevention safety regulations.
ÎIf the exhaust gases are being extracted, the exhaust pressure must be at least
250 mbar greater than the pressure at the intake side.
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.
ÎComply with the applicable regulations when working with toxic substances.
ÎOnly officially approved filter systems may be used to separate out these
substances.

11
Installation
5.4 Connecting to the mains power supply
Depending on the pump type, different motor versions are possible:
• Three phase motor (without switch and mains cable).
Three-phase motor Inspection of the direction of rotation
With pumps with three-phase motors is it necessary to check the direction of rota-
tion!
ÎRemove the locking cap from the exhaust flange (if existing).
ÎSwitch the pump on briefly (from 2 to 3 sec.).
– The motor and motor fan must turn in a clockwise direction (see the arrow on
the support stand).
ÎIf the direction of rotation is incorrect: Swap two phase contacts at the connec-
ting cable.
ÎFill up the operating fluid.
Motor protection
Pump motors equipped with PTC temperature sensors (3PTC) in the stator wind-
ings can be connected to a PTC resistor tripping device for protection against over-
load.
DANGER
Voltage-bearing elements
Electrical hazard when using electricity.
ÎThe electrical connection can be carried out only by trained and authorised
electricians.
ÎEnsure the system is adequately earthed.
CAUTION
Excess voltage!
Danger of destroying the motor.
ÎPower connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and
frequency values.
ÎTo protect the motor and supply cable in case of malfunction, mains fuse protection
must be implemented.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
ÎSecure the motor so that it cannot be switched on while any work is being performed
on the pump.
ÎIf necessary, dismantle the pump from the installation for inspection.
CAUTION
Operating fluids may leak out!
If the direction of rotation is incorrect, there is a danger that operating fluids may leak
at the vacuum flange.
ÎAlways check the direction of rotation before filling in operating fluid.

12
Installation
Tripping devices store the shutdown event and need to be manually switched back
on again via the integrated RESET button or via the external RESET S3. Mains-ON
is detected as an automatic RESET. Other approved motor temperature monitoring
can be used also by the operator.
ÎSet up the connections so that the directional rotation indicated on the pump is
maintained, regardless of the representations in the current flow diagram.
Fig. 6: Connection example for a three-phase AC motor with PTC resistor tripping de-
vice
Connection examples for fan motors at UNO 630 with thermal circuit breaker
Fig. 7: 3 phases 230V/PE
USControl voltage
S1OFF button
S2ON button
S3RESET button, external
K1 Contactor
F1 ... F4 Fuses
T1... T3 PTC resistor sensor
H1 Tripping indicator
M Motor, 3-phase
1)Only for devices with two
relay outputs
2) Only for MSR type
3)Only for order no.:
P 4768 051 FQ
N
L1
M
3
L2
L3
F1 - F3
K1
10 11
AC 220 ... 240 V
Us F4
UVW
S1
S2
k1
K1
H1
S3
2)
A1 A2 T1 T2 Y2Y1 24 21 22 14 1211
2) 2) 1) 1) 1)
T1...T3
3)
L1
M
3
W
1
PE
U
1V
1
W
2
U
2V
2
A1
A2
L3
PE
L2
PE 2
68...80˚C
1
135
246
T

13
Installation
Fig. 8: 3 phases 400 V/N/PE
The Three Phase Current Motor Circuit
Delta Connection
The three coils are connected in series with the connection point connected to the
mains. The voltage of each coil is the same as the mains voltage whereas the mains
current is the cube root of the coil current. Delta connections are denoted by the
symbol ∆. The voltage between the mains supply lines is called mains voltage. The
mains current is the current which flows in the supply lines.
Fig. 9: Motor coil and connecting plate of Delta Connection
Star Connection
The ends of the three coils are connected at the star center. The terminal voltage is
the cube root of the coil voltage; the mains and the coil current are the same. Star
connections are denoted by the symbol Y. A star connection three phase motor for
400 V mains voltage has a coil voltage of 230 V.
L1
M
3
W
1
PE
U
1
V
1
W
2
U
2
V
2
A
1
A
2
N
L2
PE
L3
PE 21
135
246
T
68...80˚C
3 400V
Y
W2 U1
L1
V2 V1
W1 U2
L3 L2
W2 U2 V2
U1 V1 W1
L1 L2 L3

14
Installation
Fig. 10: Motor coil and connecting plate of Star Connection
5.5 Filling up the operating fluid
The type and amount of operating fluid should be visible on the pump's rating
plate for every rotary vane pump.
The delivery consignment for the standard pump contains suffient operating flu-
id for one filling. The use of other operating fluids requires prior authorisation from
Pfeiffer Vacuum.
Permissible operating fluid
• D1 (standard operating fluid)
• Operating fluid for special applications on request
Filling up the opera-
ting fluid
ÎUnscrew operating fluid filler screw.
ÎFill up operating fluid.
– Correct filling level during operations: Middle of sight glass 80.
Fig. 11: Filling up the operating fluid
ÎScrew in operating fluid filler screw 140.
ÎCheck operating fluid level only when the pump is warm and running; close
– vacuum flange and gas ballast valve to do so.
– Check operating fluid daily in non-stop operation, otherwise whenever the
pump is switched on. Refilling is possible when the pump is in final vacuum
operation.
W2
U1
L1
V2
V1
W1
U2
L3 L2
W2 U2 V2
U1 V1 W1
L1 L2 L3
NOTE
Guarantees relating to attainment of final pressures and trouble free functioning
of the pump apply only providing one of the permissible operating fluids is used.
140
80
80
142/236 142/236

15
Installation
5.6 Install cooling water unit with thermal circuit breaker (option)
The cooling water unit is not necessary for normal operation. For critical operation
conditions the water cooling unit is possible to retrofit as an option.
Fig. 12: Cooling water control at the operating fluid cooler
Retrofit cooling unit
to UNO 200/240
ÎDismantle cover of the operating fluid separator 75 below the exhaust flange.
ÎInsert water cooling unit into the operating fluid separator; take care with the
o-ring.
ÎFasten with screws connection plate P.
ÎScrew in thermal circuit breaker T2 at the side of operatingfluid separator as
shown in Fig..
ÎConnect water supply and electrical connections.
– The cooling water consumption of the UNO 200/240 come to 60 ... 120 l/h ap-
prox.
Fig. 13: Cooling water unit for UNO 200 and 240
NOTE
Damage to the pump rotor
For applications with short evacuating cycles or increased ambient temperature the
rotor can get blocked after switching off and restarting the motor, because of different
rates at which the pump housing and the rotor cool down.
ÎSwitch off water cooling supply as well as a separately driven fan immediately when
switching off the pump.
T: Thermal circuit breaker
M: Magnetic valve
Standard: 230 V/AC, 50 Hz
Option: Coil vonversion kit PK 101 065,
24 V/DC (L-/L+)
T
M
68...80˚C
M Magnetic valve
P Connection plate
T2 Thermal circuit breaker (re-
place the operating fluid
drain screw)
75 Operating fluid separator
80 Cooling water connection,
input (G 1/2" female thread)
81 Cooling water connection,
output (G 1/2" male thread)
280 Operating fluid cooler
75
75 P
80 M
280
T2

16
Operations
Retrofit cooling unit
to UNO 400/630
ÎDismantle cover of the operating fluid separator 75 at the side of the operating
fluid filter 17.
ÎInsert water cooling unit into the operating fluid separator; take care with the
o-ring.
ÎFasten with screws connection plate P.
ÎScrew in thermal circuit breaker T2 at the top of operating fluid cooler 280 as
shown in the Fig. (at UNO 630 use thermal circuit breaker T1 already installed).
ÎConnect water supply and electrical connections.
– The cooling water consumption come to max. 500 l/h approx.
Fig. 14: Cooling water unit for UNO 400 and 630
6 Operations
6.1 Before switching on the pump
ÎCheck the operating fluid level in the sightglass.
ÎCompare the voltage and frequency information on the rating plate with the
mains voltage and frequency values.
ÎCheck that the exhaust connection allows free flow (max. permissible pressure
1.5 bar absolute).
– Activate the shut-off valves in such a way that they open before or at the same
time as the pump is started.
ÎProtect the pump sufficiently from taking in contaminants by means of suitable
precautions (e.g. dust filters); if necessary, check operating fluid regularly or re-
place at shorter intervals.
M Magnetventil
P Montageplatte
T Thermoschalter für Kühl-
wasserkreislauf (an UNO
630 bereits installiert)
17 Betriebsmittelfilter
75 Betriebsmittelabscheider
80 Kühlwasseranschluss, Ein
(G 1/2" Innengewinde)
81 Kühlwasseranschluss,
Aus (G 1/2" Außengewin-
de)
280 Betriebsmittelkühler
75 P M
80
81
17
T
280

17
Operations
6.2 Switching on the pump
The pump can be switched on in any pressure range.
No special precautions are necessary when pumping dry gases. In order to attain
the lowest possible final pressures, the gas ballast valve should be closed.
ÎSwitch on the pump with the vacuum flange closed and allow to warm up for 15
minutes.
Permissible operating
conditions
Operating fluid return
via float valve
The Pumps are fitted with an automated operating fluid return system via intake
flange 1 as standard. If the fluid level in the operating fluid separator 75 reaches a
definite level, the float valve 190.3 returns collected operating fluid to the pump via
oil return line 290 by means of differential pressure.
Fig. 15: Float valve 190 at UNO 240 / UNO 400
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient
conditions, the surface temperature of the pump may rise above 70 °C.
ÎIn this case, use suitable finger guards.
Type Permissible intake pressure Operating mode
without water cooling1
1. At ambient temperature of 20°C
with water
cooling
continuous
operation2
2. Continuous operation:
continuous pumping at a certain pressure.
intermitted
operation3
3. Intermitted operation:
e. g. intervall evacuation and venting of a vessel.
at 50 Hz at 60 Hz at 60 Hz
UNO 200
< 600 mbar < 200 mbar < 600 mbar unlimited max. one start
every 10 minutes
UNO 240
UNO 400
UNO 630
75 Operating fluid separator
190.1Cover
190.2Lever
190.3Float valve
190.4Seal I
190.5Seal II
290 Operating fluid return line
290.3Screw
190.3
75
190.2
190.5
290.3
190.4
290
190.1

18
Operations
6.3 Pumping condensable vapours
Should the process gases contain condensable gases present at high percentages,
the rotary vane pump must be operated with a gas ballast (i.e. with an open gas
ballast valve).
Gas ballast valve,
standard version
To avoid condensation in the pump when pumping condensable vapours, air is pe-
riodically fed into the working chamber at the beginning of the compression phase
via the gas ballast valve 74.
The gas ballast valve is closed when turning to the right to position 0 and open
when turning to the left to position 1. Intermediate settings are not possible.
Fig. 16: Gas ballast valve for UNO 200 ... 630
NOTE
The oil return only works properly if the working pressure is in the range < 600mbar
CAUTION
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibi-
lity (see Technical data) during operation without a gas ballast or in case of insufficient
supply of flushing gas.
ÎOnly pump vapours when the pump is warm and the gas ballast valve is open.
ÎWhen the process has been completed, allow the pump to continue running for
about 30 minutes with the vacuum flange closed and the gas ballast open for ope-
rating fluid regeneration purposes.
74Gas ballast valve
74.2 Gas ballast housing
74.3 Ball valve
74.4 Gas ballast filter
74.2
74.3
74.4
74
1
2

19
Operations
6.4 Switching off the pump
The pump can be switched off in any pressure range.
Rotary vane pumps have an integrated safety valve on the intake side. If the differ-
ential pressure between the exhaust side and the intake side is ≥250 mbar, then
the valve closes automatically and vents the pump when the pump is switched off.
ÎSwitch the pump off at the mains switch or disconnect from the mains in a secu-
re manner.
Venting the vacuum
chamber
Maintaining the va-
cuum in the chamber
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
ÎVent the vacuum chamber within 30 s, regardless of the chamber size.
ÎFor a longer venting process, use an additional shut-off valve and shut off the intake
line after switching off the pump.
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
ÎBecause the safety valve of the pump is not suitable for longer-term sealing, install
an additional shut-off valve in the intake line.
ÎShut off the intake line immediately after switching off the pump.
NOTE
Damage to the pump rotor
For applications with short evacuating cycles or increased ambient temperature the
rotor can get blocked after switching off and restarting the motor, because of different
rates at which the pump housing and the rotor cool down.
ÎSwitch off water cooling supply as well as a separately driven fan immediately when
switching off the pump.

20
Maintenance
7 Maintenance
7. 1 P r e c a u t i o n
ÎAllow the pump to cool to a safe temperature.
ÎOnly dismantle the pump as far as necessary in order to repair defects.
ÎDispose of used operating fluid in compliance with local regulations.
ÎWhen using synthetic operating fluids or working with toxic substances or sub-
stances contaminated with corrosive gases, the relevant instructions governing
their use must be observed.
ÎUse only alcohol or similar agents for cleaning pump parts.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
ÎSecure the motor so that it cannot be switched on while any work is being performed
on the pump.
ÎIf necessary, dismantle the pump from the installation for inspection.
WARNING
Pump parts may be contaminated from pumped media!
Danger of poisoning due to contact with harmful substances.
ÎDecontaminate the pump before carrying out any maintenance work.
ÎIn the event of contamination, take suitable safety precautions to prevent your health
from being harmed by any dangerous substances.