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BÜCHI 

Recirculating Chiller 

B-740

8

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-
ficient cooling).

•  Place the B-740 on a horizontally level, solid base

•  Connect out flow and return flow 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 filling 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.

Summary of Contents for B-740

Page 1: ...Operation Manual 096691 en B 740 Recirculating Chiller...

Page 2: ......

Page 3: ...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 s...

Page 4: ...del 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...

Page 5: ...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...

Page 6: ...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...

Page 7: ...icient for cooling two rotary evapo rators The 2500 watt version has enough cooling capacity to perfectly fit to Rotavapor R 220 The temperature range extends from 10 C to 20 C alt hough heating is no...

Page 8: ...usual hose clamps Close the drain cock Fill the cooling liquid in the filling connections approx 2 3 of the inspection glass level We recommend a mixture of ethylene glycol 30 70 which does not freeze...

Page 9: ...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 temperatur...

Page 10: ...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 B chi cust...

Page 11: ...point value 6 4 Malfunctions and their rectification Table 4 Malfunctions and their rectification Malfunction Possible cause Remedy Warnung on Colling off Pump on Ambient temperature too high Soiled...

Page 12: ...ping 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...

Page 13: ...n 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 T...

Page 14: ...ormity declaration Konformit tserkl rung 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...

Page 15: ......

Page 16: ...B CHI Labortechnik AG CH 9230 Flawil 1 Switzerland T 41 71 394 63 63 F 41 71 394 65 65 www buchi com Quality in your hands...

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