Buchi B-740 User manual

Operation Manual
096691
en
B�740
Recirculating Chiller

BÜCHI Recirculating Chiller B-740
3
Contents
Contents
B-740 Instructions 96691
1 Scope of delivery 2
2 Safety 3
3 Function 5
4 Putting into operation 6
5 Operation 7
6 Maintenance 8
7 Taking out of operation 10
8 Appendix 11
en, Version D (14 pages) Order no.
Read through these operating instructions
thoroughly before you use the BÜCHI
Recirculating Chiller B-740. Keep these
instructions in the immediate area of the
apparatus so that they can be referred to
at any time.
Chapter 2 contains important safety tips.
Knowledge of these is indispensable for the
safe operation of the apparatus.
Subject to technical alterations without prior notice. No part
of these operating instructions may be reproduced in any
form whatsoever or processed, reproduced or disseminated
using electronic or optical systems without the written per-
mission of Büchi Labortechnik AG. All rights reserved.
Copyright © Büchi Labortechnik AG, 1997

BÜCHI Recirculating Chiller B-740
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Figure 1: Total view B-740
1 Scope of delivery
Description
Apparatus versions: Order no.
Büchi Recirculating Chiller B-740 230 V
Model 800 Watt 37740
Model 1400 Watt 37741
Model 2500 Watt 40300
Table 1: Scope of delivery
Enclosed parts:
1 Instructions:
Deutsch 96690
English 96691
French 96692
Italian 96693
Spanish 96694
1 Mains cable PNE, 2,5 m
Type CH 10010
Type Schuko 10016
Type GB 17835
Type AUS 17836
Type USA 10020
1 Packaging cpl.
Table 2: Enclosed parts
1 Scope of delivery
Figure 2: B-740, 2500W
Optional accessories:
Distribution head with taps 37742
Table 3: Optinal accessories

BÜCHI Recirculating Chiller B-740
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2 2 Safety
2 Safety
The apparatus is constructed in accordance with state-
of-the art technology and recognized technical safety
regulations.
Nevertheless risks and danger can arise from the appara-
tus:
• if the apparatus is not used according to instructions.
• if the apparatus is operated by insufciently trained
personnel.
2.1 Symbols
Stop
Information on the dangers which can lead to great damage
to property or to severe or life-threatening injuries.
Warning
Information on the dangers which can lead to damage to
one’s health or to damage to property.
Please note
Information which indicates technical requirements. Non-
compliance can lead to disturbance, uneconomical ope-
ration or production losses.
2.2 Demands on the operator
The apparatus may only be used by persons who have an
overview of the dangers which can develop when operating
the apparatus.
2.3 Regulation use
The Recirculating Chiller is conceived and built as a piece
of laboratory equipment. Its regulation use is the cooling
of closed cycles (e.g. rotary evaporators, reaction vessels
...).
The regulation use of the Recirculating Chiller also includes
its care.

BÜCHI Recirculating Chiller B-740
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2 Safety
2.4 Nonregulation use
Any and every use other than the above-mentioned as well
as any and every application which does not correspond
to the technical data is a misapplication. The operator
bears the sole risk for any possible damage traced back
to such a use.
In particular, the following uses are improper:
Use of the apparatus in rooms which require explosion-
proof apparatus.
2.5 Safety measures
The wearing of personal protective equipment such as
safety glasses is necessary.
These operating instructions must, as a component of the
Recirculating Chiller B-740 be available at all times to the
operating personnel at the place of use of the apparatus.
The operator is responsible for the instruction of his or her
personnel. For this purpose these operating instructions
may be ordered in other languages.
The operator is to inform the manufacturer immediately
about all safety related incidents which take place during
operation of the apparatus.
2.6 Safety elements
The apparatus is tted with a thermal overload protection
for the compressor and the pump.
The minimum quantity of cooling liquid is controlled by a
niveau sensor..

BÜCHI Recirculating Chiller B-740
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3 Function
The Büchi Recirculating Chiller B-740 is a closed-circuit
cooler for use with rotary evaporators. The two models
are distinguished by their outputs. The 800 watt version
is optimal for cooling one laboratory rotary evaporator, the
1400 watt version is sufcient for cooling two rotary evapo-
rators. The 2500 watt version has enough cooling capacity
to perfectly t to Rotavapor R-220.
The temperature range extends from -10°C to 20°C, alt-
hough heating is not possible. The B-740 regulates the
temperature to within +/- 1 K exactly. The desired value
is simply entered with two keys (UP and DOWN) and can
be easily read from the LCD display (desired and actual
temperatures).
The environmentally-friendly refrigerant R134a is used as
the refrigerating medium.
3 Function

BÜCHI Recirculating Chiller B-740
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Check whether the voltage of the socket outlet is the same
as the voltage given on the apparatus plate. Do not turn
the apparatus on before the refrigerant has been added
and the rotary evaporator is connected.
The apparatus must have a minimum distance of 40 cm
between itself and the wall, both in front and behind (suf-
cient cooling).
• Place the B-740 on a horizontally level, solid base
• Connect out ow and return ow connections of the
B-740 with the cooler of the rotary evaporator. Only
use hoses which can withstand min. -10°C and 1 bar
pressure and secure these with the usual hose clamps.
• Close the drain cock
• Fill the cooling liquid in the lling connections (approx.
2/3 of the inspection glass level) We recommend a
mixture of ethylene glycol 30/70, which does not freeze
until -15°C
• Connect B-740 to electricity supply
4 Putting into operation
Figure 3: Draincock 2500W
Figure 4: Fillingconnection 1 Figure 5: Fillingconnection 2
4 Putting into operation
B-740/25
To avoid the rattling of the compressor heating when the
chiller is started, please consider the following:
• Connect the chiller to the power supply at least 1 hour
before start-up, but do not switch it on, yet.
• Keep the chiller connected to the power supply during
the entire operation.
• After the power supply was interrupted, connect the
chiller to the power supply at least 1 hour before start-
up, but do not switch it on, yet.

BÜCHI Recirculating Chiller B-740
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5 Operation
Turn on apparatus
Key Operation Display Function
ON e. g. 25.0
(actual temp.)
• Displays the actual temperature
• Set desired temperature compressor start
• Circulation pump is running
SET shortly
press
e.g. 10.0 • Display the set temperature
SET + Dpress e.g. 10.00 • Increase the desired set temperature in steps of 0.1°C
SET + ∇press e.g. 10.0 • Decrease the desired set temperature in steps of 0.1°C
The apparatus is not splash-proof.
5.1 Operatingelements
SET Indicate set temperature
D Increase set temperature
∇ Reduce set temperature
WARNING indicator in the case of malfunction
COOLING Cooling indicator
PUMP Indicator for circulating pump
a desired set temperature achieved,
regulation runs
5 Operation
The COOLING and PUMP lamps are always on in normal
operation.
Figure 6: Operating component

BÜCHI Recirculating Chiller B-740
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6 Maintenance
6 Maintenance
All information which is directed at maintaining the Re-
circulating Chiller in an operationally reliable condition is
to observed. This also includes a periodic cleaning and
inspection for possible damage.
6.1 Cleaning
The housing is to be cleaned with a damp cloth without
the use of solvents and to be inspected visually for damage
(operating elements, plug).
Empty contaminated cooling liquid by means of the drain
cock and renew.
6.2 Customer service
Operations on or in the apparatus can only be carried out
by authorized service personnel. These are persons with
a sound technical training and knowledge of the dangers
which can result from not following safety precautions.
Büchi customer service centers have apparatus-specic
service manuals which are available only to authorized
personnel.
The addresses of ofcial Büchi customer service centers
are given on the last jacket page of these operating instruc-
tions. Büchi company customer service is available for the
following services: replacement parts service (please refer
to the order number as listed in the operating instructions),
repair service, maintenance service and technical advice.
Please contact the Büchi representative in your country by
telephone, or by fax or telex.

BÜCHI Recirculating Chiller B-740
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6 Maintenance
6.3 Functional inspection
After every operation, the following parameters are to be
checked:
• Filling level cooling liquid
• Turning on the B-740
• Cooling on / Pump on
• Control set point value
6.4 Malfunctions and their rectification
Table 4: Malfunctions and their rectication
Malfunction Possible cause Remedy
Warnung on
Colling off
Pump on
Ambient temperature too high
Soiled liquidator
Change position of the apparatus
Remove front plate; clean lamella with brush or
hoover
Warnung on
Colling off
Pump on
no / too few cooling liquid
Pumpe defekt
Fill up cooling liquid
Please contact customer service

BÜCHI Recirculating Chiller B-740
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7 Taking out of operation
7.1 Storage/shipping
The cooling liquid is to be drained before storage or ship-
ping. The apparatus is to be stored in the original packaging
in a dry location. Shipping is also to be done in the original
packaging.
7.2 Disposal
In order that the apparatus be disposed of in the most
proenvironmental manner possible, there is in Chapter
8.2, Materials used, a list of the most important parts.
In this way it is ensured that the parts can be separated
and recycled.
For the disposal of electronic components we refer to re-
gional and local disposal laws and regulations.
7 Taking out of operation

BÜCHI Recirculating Chiller B-740
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B-740/8 B-740/14 B-740/25
Supply voltage 230 V, 50 Hz 230 V, 50/60 Hz 230 V, 50 Hz
Power consumption max.750 W max.1200 W max.1800 W
Display digital, resolution 0.5 K
Temperature constancy ±1 K
Cooling power at 15°C 800 W 1400 W 2500 W
Pump throughput (max.) 3 l/min 11 l/min 11 l/min
Pumping pressure (max.) 0.6 bar 1 bar 1 bar
Refrigerant R134a
Apparatus dimensions
w x h x d/mm
400 x 570 x 450 400 x 670 x 450 550 x 1100 x 450
Weight 42 45 99
Ambient temperature +15°C...+32°C
Tank volume 5 l 5 l 20 l
8 Appendix
8 Appendix
8.1 Technical data
8.2 Materials used
Part Materials Material code
Housing Stainless steel PA
Lamina Polyester PES
Circuit board Glass ber rein-
forced epoxy
resin
Cable Polyvinyl chloride PVC
Refrigerant R134a
Table 6: Materials used
Table 5: Technical data

BÜCHI Recirculating Chiller B-740
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9 Appendix
8.3 EC conformity declaration
Konformitätserklärung
Declaration of Confirmity
:
:
Chiller B-741
Recirculating Chiller B-740
Dehumidifier B-296
- EN 61010-1 /2002-08
- EN 61010-2-010/ A1
- EN 61326 -1:2006
2006/95/EC
2004/108/EC
2006/42/EC
Freital, 06.April 2009
( Hans-Jörg Kupka, Owner)

BÜCHI Labortechnik AG
CH-9230 Flawil 1/Switzerland
T [phone]
F [phone]
www.buchi.com Quality in your hands