Buchi Rotavapor R-220 User manual

1
BÜCHI Rotavapor R-220 Table of Contents
Table of Contents
en, Version F (46 Pages) Ordering No.
R-220 Operation Manual 96737
Read this Operating Manual through carefully before using
the Büchi Rotavapor R-220. Always keep these Instructions
readily available in the immediate vicinity of the unit so that
they make be consulted at any time.
Chapter 2 contains important safety rules which must be ob-
served to ensure the safe operation of the rotary evaporator.
We reserve the right to make technical changes without
prior notification. No portion of this Operating Manual
may be reproduced, processed using electronic or optical
systems, duplicated, or distributed in any form without
the prior written approval of Büchi Labortechnik AG.
All rights reserved. © Büchi Labortechnik AG, 1999-2001
6 Maintenance 23
6.1 Taking Apart the Snap Flange Coupling 23
6.2 Assembling the Snap Flange Coupling 24
6.3 Removing the Evaporating Flask Seal 24
6.4 Inserting the Evaporating Flask Seal 25
6.5 Replacement of the Seals for the Distribution Head 25
6.6 Replacement of the Vacuum Seal 26
6.7 Cleaning 26
6.8 Vacuum Seal 26
6.9 Testing for Leaks 27
6.10 Customer Service 27
7 Taking out of Operation 28
8 Spare Parts and Accessories 29
8.1 Glass Assemblies D, D2, DB, DB2 30/31
8.2 Glass Assemblies R, RB, C 32/33
8.3 Miscellaneous 34
8.4 Accessories 37
9 Appendix 42
9.1 Technical Data 42
9.2 Materials Used 42
9.3 Error Messages 43
9.4 FCC requirements (for USA and Canada) 44
9.5 Declaration of Conformity 45
1 Scope of Delivery 2
2 Safety 3
3 Function 6
3.1 Principle of Operation 6
4 Putting into Operation 7
4.1 Installation Location 7
4.2 Unpacking 7
4.3 Setting up the Support Rod 8
4.4 Attachment of the EasyClamp 9
4.5 Removal of the EasyClamp 9
4.6 Installation of the Reflux Glass Assembly 10
4.7 Installation of the Descending Glass Assembly 11
4.8 Installation of the Descending Glass Assembly
with a 2nd Cooler 12
4.9 Installation of the Receiving Fixture 13
4.10 Attaching and Removing Flasks 14
4.11 Hose Coupling 16
4.12 Operating the Shut-off tap 18
4.13 Bath Replenishment (Optional) 18
4.14 Reset of the over-temperature protection 19
4.15 Heating Medium 19
4.16 Checking Installation 19
5 Operation 20
5.1 Arrangement of the Operator Control and
Display Elements 20
5.2 Adjusting the Maximum Set-Point Temperature
and Automatic Lowering of the Bath in Case of
a Power Interruption 20
5.3 Tips and Tricks 21
5.4 Table of Solvents 22

2
BÜCHI Rotavapor R-220
1 Scope of Delivery
Fig. 1: R-220, Overall View
1 Scope of Delivery
Component
1 Chassis, complete, with control and
driving unit and with heating bath
1 6L, 10L or 20L Evaporation flask
1 Receiving flask 1 x 10L Single receiver or
2 x 10L Interchangeable receivers
1 Glass assembly
(Refer to Chap. 4.6 - 4.8 for Figure)
Table 1: Scope of Supply
Standard Accessories: Ordering No.
1 Seal tool 20057
1 Operating Manual
German 96736
English 96737
French 96738
Italian 96739
Spanish 96740
Table 2: Standard Accessories

3
BÜCHI Rotavapor R-220 2 Safety
2 Safety
This unit has been built in accordance with the latest state of
the art and with recognized rules of safety.
Nevertheless there are certain risks and dangers entailed with
this unit:
• whenever the unit is operated by individuals who lack
sufficient training;
• whenever the unit is used for some purpose other than its
authorized use.
2.1 Symbols
Stop
Information on dangers that can cause serious material
damage and severe personal injuries or death.
Warning
Information on dangers that can be injurious to one’s health
or cause material damage.
Note
Information pointing out technical requirements. A failure to
observe such information can lead to malfunctions, uneco-
nomical operation, and losses in production.
2.2 Responsibilities of the Operator
This unit may only be used by technical staff and by individuals
who, based on their training or their professional experience,
have a good understanding of the dangers that can arise
from the its operation.
Staff who do not have this training and individuals who are
currently in training must be given careful instructions. This
Operating Manual should be used as the basis for such training.
2.3 Authorized Use
The rotary evaporator has been designed for use in technical
laboratories and in production. It is authorized for use in applica-
tions that work with the evaporation and condensation of
solvents.
It is used for:
• Evaporation of solvents and suspensions
• Drying of powders and granulates
• Re-crystallization
• Reactions under reflux
• Synthesis and Cleaning of refined chemicals
• Recycling and concentration of solvents
The authorized use of the Rotavapor also includes its care,
upkeep, and careful handling in accordance with the provisions
in this Operating Manual.

4
BÜCHI Rotavapor R-220
2 Safety
2.4 Unauthorized Use
Any use other than those indicated above, and any use that
is not in conformity with the Technical Data is considered to
be misuse. The operator himself bears sole responsibility for
all damage or injuries arising from any such use.
The following applications in particular are strictly forbidden:
• The production and processing of materials that can cause
spontaneous reactions, e.g., explosives;
• Working without the evaporation flask being immersed in
the water bath (risk of breakage);
• The drying of hard, brittle materials (e.g., stones, soil sam-
ples) that might cause damage to the receiving flask;
• Sudden shock-cooling of the evaporating flask.
The Rotavapor R-220 is not intended for work done under
overpressures.
2.5 Basic Dangers
Basic dangers arise when working with the following:
• The hot water or oil bath (risk of being scalded);
• Contaminated solvents that produce residues from distilla-
tion which could cause spontaneous reactions (e.g., metal
hydrides);
• Solvents that can produce peroxides (risk of explosions);
• Mixtures with unknown compositions or contamination;
• Damaged glassware;
• Electrostatic charges while working, e.g., during the trans-
fer of combustible solutions and while drying powders;
• Temperatures of coolants that lie below the freezing point
of the distillate (A clogging of the distillate cooler due to
freezing out can result in too great an overpressure).
2.6 Safety Precautions
All regional and local laws and regulations must be observed.
The Rotavapor has been grounded internally to dissipate any
electrostatic charges on it.

5
BÜCHI Rotavapor R-220
It is always mandatory to wear personal protective gear such
as protective eyewear and protective clothing.
The machine must never be rotated without the snap flange
coupling and evaporation flask being closed.
No distillation may be started unless the evaporating flask is
immersed in the bath. There is always the risk that the neck
of the flask might break off due to the great weight involved.
There is a risk of becoming scalded while changing evaporating
flasks. Wearing gloves prevents this.
Check the glass components regularly for possible damage,
spreading impact marks, or cracks.
Never interrupt the grounding conductor (protective conductor).
Otherwise there will be the risk of an electrical shock!
The operator bears responsibility for providing proper instruction
of his operating staff. To aid him in doing this, translations of
this Operating Manual are also available in several other
languages. As an integral component of the rotary evaporator,
this Operating Manual must be readily available at all times to
the operating staff at the location where they are using the
unit.
The operator must inform the manufacturer immediately of
any and all events relevant to safety that occur in his use of
this equipment.
2.7 Modifications
No modifications are permissible without consulting with and
obtaining the written approval of the manufacturer.
No glass assemblies other than those recommended by the
manufacturer may be used, nor may any glass components
be put together arbitrarily.
Only those components of the rotary evaporator intended for
fulfillment of its function may be installed in or removed from
the unit. This may be done either by hand, or with the use of
the tool supplied along with the unit. The removal of safety
devices or covers using some commercially available tool is
— other than for authorized commissioning personnel — strictly
forbidden. Contact with parts that are electrically live may
result in fatal injury!
2 Safety

6
BÜCHI Rotavapor R-220
3 Function
Fig. 2: Principle of operation of the R-220
3 Function
A vacuum rotary evaporator is used for quick single-stage
distillations that treat the product gently. The process is based
on the evaporation and condensation of solvents in a rotating
evaporating flask.
It is possible to work under a vacuum to ensure gentler treat-
ment of the product and increase productive output.
Distillation may be done either under a vacuum or at atmos-
pheric pressure.
A secure closeness is guaranteed in the low pressure range.
3.1 Principle of Operation
햲Evaporation Zone
The solvent in the evaporating flask is heated by the heating
bath. The rotation of the evaporating flask ensures an in-
tensive exchange of heat and mass within the contents of
the flask, forming a thin film of solvent on the inner surface
of the flask. This combination of turbulence and film prevents
local overheating and ensures high distillation speed.
햳Rotary Drive
The drive unit ensure the uniform rotation of the evaporating
flask.
햴Cooling Zone
The solvent vapor flows into the cooler at a high speed.
This is where the energy in the solvent vapor is transferred
to the cooling medium (e.g., water). The solvent condenses.
햵Receiving Flask
The receiving flask is used to collect the condensate.
햶Vacuum Cover
The system pressure is reduced so as to lower the boiling
point of the solvent. The reduction in thermal loading that
results ensures gentle treatment of the product and offers
energetic advantages.
The pressure (vacuum) of distillation, the temperature of the
heating bath, the rotational speed, and the size of the evapo-
rating flask all affect the evaporation output. Refer to Chapter
5.3 for how to select the optimum conditions of distillation.
햵
햴
햲
햳
햶

7
BÜCHI Rotavapor R-220 4 Putting into Operation
4 Putting into Operation
The danger zone around the Rotavapor R-220 can extend
outward by up to 10 m. When working inside this danger
zone, there is a risk of damaging the glass parts, which could
cause them to implode.
The electrical connection must be installed and checked
by an authorized person.
4.1 Installation Location
Always set the unit up on a clean, stable, and flat surface.
Never at a location where there is a great deal of personal
traffic (breaking or broken glass) !
The dimensions of the rotary evaporator are:
Height:
without trolley Reflux 1700 mm
Descending 1800 mm
Bullfrog Reflux 1430 mm
Bullfrog Descending 1550 mm
with trolley Reflux 2300 mm
Descending 2400 mm
Width:
Reflux 1100 mm
Descending 1250 mm
Descending, with 2 coolers 1250 mm
Depth:
Single receiver 550 mm
Interchangeable receivers 650 mm
4.2 Unpacking
Take care not to break the glass when opening cartons that
contain glassware.
Look for any damage after unpacking. It is important that any
damage in transit be identified right when unpacking. If nec-
essary, make an immediate assessment of the situation (Notify
the post office, the railroad, or the shipping company involved).
Save the original packing for possible transport at a later date.

8
BÜCHI Rotavapor R-220
4 Putting into Operation
Fig. 3: Support rod
4.3 Setting up the Support Rod
• Place the support rod 햳into the holder provided for it and
lower it into the foot hole at the back. Fix it tight using the
locking screw 햲.
• Put the positioning ring 햴on over the rod, 150 mm below
the upper edge.
• Lay the pivoting clamp 햵on top of the positioning ring.
• Attach the pivoting clamp for the receiving flask 200 mm
above the bottom edge of the rod.
When installing an interchangeable receiver:
• Place the short support rod into the holder at the front and
lower it into the foot hole. Screw it tight using the locking
screw.
• Attach the pivoting clamp approx. 200 mm above the lower
edge of the rod.
햲
햴
햳
햵

9
BÜCHI Rotavapor R-220 4 Putting into Operation
4.4 Attachment of the EasyClamp
• Carefully lay the EasyClamp around the glass and fold the
top and bottom segments together, closing them at their
open connection point.
• Insert the bolt that does not have a spacer spring, and
tighten the knurled nuts slightly.
• Tighten all knurled nuts uniformly by hand.
Note:
Always tighten the knurled nuts by hand and not to the block
(with the spring pressed together completely). Otherwise the
prestressing will be lost.
There must always be a gap of about 2 mm between the
knurled nut and the support surface.
4.5 Removal of the EasyClamp
On all EasyClamp connections, only the bolt without a
spacer spring has to be removed in order to open the con-
nection.
• Release the knurled nuts on all (2 or 3) bolts until the springs
have been relieved. Do not, however, screw the nut all
the way off.
• On the bolt that does not have a spacer spring, release
the knurled nut far enough (without removing it completely)
so that the bolt can be tilted out and removed as a unit.
• At the connection point, which is now open, spread the
top and bottom segments apart and carefully remove the
EasyClamp.
Fig. 4: Attachment of the EasyClamp
Fig. 5: Removal of the EasyClamp

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BÜCHI Rotavapor R-220
햸
햺
햻
햷
햲
햹
햶
햳
햵
햴
햶
4 Putting into Operation
4.6 Installation of the Reflux Glass Assembly
All glassware used must be intact, with no signs of cracks,
spreading impact marks, or other damage. Inspect the glass-
ware visually before installing it.
• Fix the reflux distribution head 햲in position on the gear
head using a DN70 EasyClamp connection.
• Introduce the cooler 햳, together with the cooler holder
햴, into the pivoting clamp 햵and connect it to the distribu-
tion head (DN45 EasyClamp connection).
• Align the cooler 햳in a vertical position and fix it in place
with the pivoting clamp 햵.
• Screw the cooling water hose nipples 햶onto the cooler
햳.
• Insert the shut-off tap 햷into the distribution head 햲and
tighten it firmly.
• Introduce the stop cock 햸into the distribution head with
the PTFE hose attached to it, and secure it with a standard
joint clamp 햹.
• Attach the condensate cooler 햺to the distributor head
with a DN25 EasyClamp connection and fix it in position.
• Screw the temperature sensor 햻into the distribution head
햲.
• Check all EasyClamp connections and tighten them evenly
and in parallel.
→The installation of the receiving fixture is described on Page
13.
Fig. 6: Reflux glass assembly

11
BÜCHI Rotavapor R-220 4 Putting into Operation
4.7 Installation of the Descending Glass Assembly
All glassware used must be intact, with no signs of cracks,
spreading impact marks, or other damage. Inspect the glass-
ware visually before installing it.
• Fix the descending distributor head 햲in position on the
gear head using a DN70 EasyClamp connection.
• Put the expansion vessel 햳onto the distribution head
and fix it in position with a DN45 EasyClamp connection.
• Introduce the cooler 햴, together with the cooler holder
햵, into the pivoting clamp 햶and connect it to the distribu-
tion head (DN45 EasyClamp connection).
• Connect to the cooler and the expansion vessel using the
U-tube 햷and fix in position with two DN45 EasyClamp
connections.
• Align the cooler 햴and the expansion vessel 햳in their
vertical positions and fix them in place with a pivoting clamp
햶.
• Screw the cooling water hose nipples 햸onto the cooler
햴.
• Insert the stop cock 햹, with the PTFE hose mounted on
it, into the distribution head, and secure it with a standard
joint clamp 햺.
• Fasten the vacuum connector 햻to the Y-connection 햽
with a DN45 EasyClamp connection and fix the unit in
place on the lower end of the cooler with a DN45
EasyClamp.
• Screw the temperature sensor 햾into the support connec-
tion in the U-tube 햷.
• Check all EasyClamp connections and tighten them evenly
and in parallel.
→The installation of the receiving fixture is described on Page
13.
Fig. 7: Downgrade glass assembly
햸
햴
햷
햸
햻
햽
햺햹
햲
햳
햶
햷
햾

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BÜCHI Rotavapor R-220
4 Putting into Operation
4.8 Installation of the Descending Glass Assembly
with a 2nd Cooler
All glassware used must be intact, with no signs of cracks,
spreading impact marks, or other damage. Inspect the glass-
ware visually before installing it.
• Fix the descending distributor head 햲in position on the
gear head using a DN70 EasyClamp connection.
• Place the expansion vessel 햳on the distribution head
and fix it in position with a DN45 EasyClamp connection.
• Introduce the cooler 햴, together with the cooler holder
햵, into the pivoting clamp 햶.
• Connect the cooler and the expansion vessel with the U-
tube 햷and fix them in position with two DN45 EasyClamp
connections.
• Insert the second cooler 햸, together with the cooler holder
햹, into the pivoting clamp 햺.
• Join the two coolers with the Y-connection 햻and fix them
in position with two DN45 EasyClamp connections.
• Align the coolers (햴and 햸) and the expansion vessel 햳
in their vertical positions and fix them in place with pivoting
clamps (햶and 햺).
• Screw the cooling water hose nipples 햽onto coolers 햴
and 햸.
• Insert the stop cock 햾, with the PTFE hose mounted on
it, into the distribution head, and secure it with a standard
joint clamp 햿.
• Screw the temperature sensor 헀into the support connec-
tion in the U-tube.
• Check all EasyClamp connections and tighten them evenly
and in parallel.
→The installation of the receiving fixture is described on Page
13.
Fig. 8: Downgrade glass assembly with two coolers
햸
햹
햽
햺
햽
햻햿햾
햶
햲
햷
햳
헀
햴
햵

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BÜCHI Rotavapor R-220 4 Putting into Operation
4.9 Installation of the Receiving Fixture
All glassware used must be intact, with no signs of cracks,
spreading impact marks, or other damage. Inspect the glass-
ware visually before installing it.
Single Receiver
• Fasten the support ring 햲to the support rod with a pivoting
clamp 햳.
• Screw the outlet valves 햴on the receiving flask 햵on
tight using a DN25 EasyClamp connection.
• Place the receiving flask on the support ring 햲.
With a reflux glass assembly:
• Bring the support up and fix the flask in position on the dis-
tillate cooler using a DN25 EasyClamp connection.
With a descending glass assembly:
• Attach the branching piece 햶to the opening at the bottom
of the Y-connection with a DN45 EasyClamp connection.
• Insert the shut-off tap 햷into the branching piece 햶and
tighten it firmly.
• Bring the support up and fix the receiving flask 햵in position
on the branching piece 햶using a DN25 EasyClamp con-
nection.
Dual Receiver
• Fasten the support rings 햲to the support rods at the
front and back using pivoting clamps 햳.
• Screw the outlet valves 햴firmly onto the receiving flask
햵using DN25 EasyClamp connections.
• Place the receiving flasks 햵on the support rings 햲.
• Screw the two shut-off taps 햶into the branching pieces
(햷and 햸) and tighten them.
• Connect the branching pieces with a DN25 EasyClamp
connection. Place them on the receiving flasks 햵, and
fasten them with DN25 EasyClamp connections.
With a reflux glass assembly:
• Bring the receiving flask up, and fasten the branching piece
햸to the condensate cooler using a DN25 EasyClamp
connection.
With a descending glass assembly:
• Bring the receiving flask up, and fasten the branching piece
햸to the Y-connection using a DN25 EasyClamp con-
nection.
Fig. 9: Single receiver, reflux
Fig. 11: Interchangeable receiver
Fig.10: Single receiver, downgrade
햸
햳
햳
햴
햲
햷
햶
햲
햳
햵
햴
햲
햳
햵
햶
햴
햷
햶
햵
햲
햴

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BÜCHI Rotavapor R-220
4 Putting into Operation
4.10 Attaching and Removing Flasks
Bring up the flask
• With the snap flange coupling open, lay the flask in position.
• Close the first segment of the snap flange coupling( T h e
hook must latch in).
• Close the second segment of the snap flange coupling.
• Insert the closure hook and press down the closure lever.
A clear resistance must be felt when this is done. If not,
readjust the tension on the closure.
Adjusting the tension on the closure:
Open the closure hook up, and turn it.
Turning clockwise increases pressure
Turning counterclockwise reduces pressure
If the flange of the evaporating flask is outside of a certain
tolerance, the adjustment with the hook is not possible.
This evaporating flask must not be used!
Fig. 12: Snap flange coupling, with flask laid in place
Fig. 13: Closing the snap flange coupling
Fig. 14: Adjusting the tension on the closure

15
BÜCHI Rotavapor R-220 4 Putting into Operation
Fig. 16: Opening the second segment
Fig. 15: Opening the closure
Removing flasks
• Place your hand under the flask to hold it from below.
• Open the closure lever 햲.
• Use your thumb to release the closure hook 햳.
• Flip up the first segment of the snap flange coupling.
• With your hand under the flask, lift it lightly slightly from
below and relieve pressure on it.
• Press the hook 햴in.
• Open the second segment of the snap flange coupling.
• Lift the flask out at the top and remove it.
햳
햴
햲

16
BÜCHI Rotavapor R-220
4.11 Hose Couplings
In general, observe the following items for all glass assemblies.
The cooling water inlet is always at the lower condenser
connection.
When there are two condensers (D2 und DB2), the two con-
densers can be connected serially, the additional condenser
being cooled first.
The following is the key for all of the hose diagrams on these
two pages.
햲Cooling water inlet for first condenser
햳Cooling water outlet for first condenser
햴Cooling water inlet for second condenser
햵Cooling water outlet for second condenser
햶Vacuum connection
햷Vacuum controller
햸T-piece (026117)
햲
햴
햵
햳
햶
햷
햲
햳
Fig. 17: Hose Couplings 1
4 Putting into Operation

17
BÜCHI Rotavapor R-220
햶
햷
햲
햳
햶
햷
햸
햴
햵
햲
햳
햵
The following is the key for all of the hose diagrams on these
two pages.
햲Cooling water inlet for first condenser
햳Cooling water outlet for first condenser
햴Cooling water inlet for second condenser
햵Cooling water outlet for second condenser
햶Vacuum connection
햷Vacuum controller
햸T-piece (026117)
Fig. 18: Hose Couplings 2
햷
4 Putting into Operation

18
BÜCHI Rotavapor R-220
4 Putting into Operation
4.12 Operating the Shut-off tap
The shut-off tap is of a special design. It does not have a
continuous thread on its inside for tightening it, but rather a
sliding plane with two fixed latching positions. The closing pres-
sure when it is in a closed position is provided by a prestressed
spring.
• Insert the shut-off tap on the distribution head and turn
the white lower section of the grip 햲clockwise until the
shut-off tap is tightly seated.
• To open:
Turn the gray upper section of the grip 햳clockwise until
the shut-off tap latches into the 1st position.
If the opening is not large enough, continue turning until
the shut-off tap reaches the 2nd position.
4.13 Bath Replenishment (Optional)
햲Bath replenishment inlet
Hose nipple, Diam.14 mm
햳Bath replenishment outlet
Hose nipple, Diam.14 mm
Opening the needle valve 햴slightly by one-quarter turn pro-
duces a continuous supply flow.
Introduce the Open/Shut valve supplied with the unit into the
bath replenishment inlet 햲and connect it to “CW Valve” on
the back wall of the unit. This interrupts the replenishment of
the bath when rotation stops.
The installation of the water valve is described in chapter
8, Replacement Parts, Water Valve.
If oil is used as heating medium, the bath replenishment
has to be emptied and disconnected from the water inlet.
Otherwise, there is a risk of water pouring into the hot oil
bath.
Operating Instructions!
When rotation stops, the cooling water and bath replenishment
water switch OFF after short delay. As soon as rotation starts,
the valve reopens and the water flows once again.
Fig. 19: Shut-off tap
Fig. 20: Bath replenishment
햲
햳
햴
Fig. 21: Bath replenishment
햲햳
햳

19
BÜCHI Rotavapor R-220 4 Putting into Operation
4.14 Reset of the over-temperature protection
If the heater heats up over 205°C (e.g. if no heating medium
is in the bath), it is cut off by a mechanical overtemperature
protection.The overtemperature protection is reset by pushing
the button under the heating block.
4.15 Heating Medium
Never operate the heating bath when there is no heating me-
dium in it!
Suitable heating media include:
• Water (some Borax should be added when using
deionized water)
• Heat transfer oils suitable for use at temperatures up to
160° C (e.g., Ucon HTF 14, Fluka AG).
• Water-soluble polyethylene glycol
(e.g., Polyethylene glycol 600, Fluka AG).
After the oil bath has been standing opened for a prolonged
period, condensation water can collect on the bottom. When
the bath is used again, it must be heated above 100°C with
rotating flask in order to drive the water out.
4.16 Checking Installation
After installation has been completed and before doing the
first distillation, check to make sure the installation has been
carried out correctly:
• Inspect the glass visually for possible damage.
• Check that all connections (steam, water, vacuum) have
been fixed properly in position.
• Check the tightness of the vacuum.
Fig. 22: Reset of the over-temperature protection

20
BÜCHI Rotavapor R-220
5 Operation
Fig. 23: Operator control elements for the R-220
5 Operation
Make certain that the unit has been commissioned properly
as described in Chapter 4.
5.1 Arrangement of the Operator Control and
Display Elements
햲Main breaker switch
햳Lift for the bath
햴Rotation ON/OFF
햵Rotating speed adjustment
햶Rotating speed display
햷Heater ON/OFF
햸Input: Set-point temperature for bath
햹Temperature UP/DOWN
햺Display for bath temperature
햻Display for vapour temperature
햽Aeration
The bath is lowered automatically when the unit is switched
off or in case of a power failure to ensure that the evaporating
flask will in all cases remain outside the source of heat (optional).
5.2 Adjusting the Maximum Set-Point
Temperature and Automatic Lowering of
the Bath in Case of a Power Interruption
Setting the Maximum Set-Point Temperature
• Press the button “SET TEMP” 햸, simultaneously switching
on the main breaker switch 햲. This activates the input for
setting the maximum set-point temperature.
• The value can be set at any level desired by pressing the
“DOWN” and “UP” buttons 햹.
• The input is stored and the unit switched into the operating
mode only after the “AERATE” button 햽is then pressed.
햽
햷
햹
햸
햺
햻
햳
햵
햴
햶
햲