BUCHI Rotavapo R-250 - Manual (Page 20)

20
Rotavapor R-250
4.14 Connections to the Vacuum and Cooling
Medium
Vacuum
The Rotavapor R-250 is connected to the vacuum source
on the rear panel. The vacuum hose is then routed from the
venting valve (inside the unit) to the condensation unit.
For the reflux set-up both condensers are connected to the
hose via a Y-piece.
In the case of the descending glass assembly the vacuum
hose is connected at the vacuum connector or at the third
cooler.
Cooling medium
The cooling medium is connected at the valve fittings
ቢ.
The flow is adjusted by means of the tap. In the case of the
reflux glass assembly, the distillate cooler is connected to
one cooler from the valve
ቢ via Y-piece ባ and the second
cooler is connected in parallel. Finally, the two condensers
are connected via a Y-piece
ቤ and the cooling medium is
returned at the wide hose nipple.
In the case of the descending glass assembly, the cooling
medium is distributed between the two condensers from
the valve via a Y-piece
ባ and is then returned via a second
Y-piece
ቤ.
A list of the supplied hoses with Part Numbers can be found
in Chapter 8.6.
If a third cooler fitted downstream is used, it is connected
in parallel across a special water distributor head. A second
cooling circuit at a lower temperature can also be used so
that the third cooler becomes a cold trap.
Fig. 4.19: Vacuum hoses
Fig. 4.20: Cooling water hoses
Fig. 4.21: Cooling water hoses: versions with third cooler
4 Putting into Operation
aeration valve
ቤ ቤ
ባ
ባ
ቢ