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.
