Cooling Water Supply - BÖWE P12 Installation Instructions Manual

7 Connection
7.2.3

Cooling Water Supply

7.2.3.1 Mains Water Supply
The cross-sections of the lines to the machine should not get smaller and should be without bends and
curves, if possible. The heat balance has been optimally designed for cooling water with an inlet
temperature of 12 °C (53.6 °F) and uniform pressure of 2 - 4 bar (29 - 58 psi). (Minimum pressure 2.0 bar
(29 psi) and maximum pressure 6.0 bar (87 psi))
A manually operated stop valve should be fitted.
Peak cooling water demand 2 - 4 bar (29 - 58 psi) at 12 °C (53.6 °F):
P12:
7 l/min
(1.8 US gal/min)
According to DIN 1988, a water flowback stop and venting device must be installed on machines in the
Federal Republic of Germany.
7.2.3.2 Cooling Tower Operation
For cooling tower or recooling operation, the nominal width of the feeding and drain lines must be
dimensioned to be larger than the nominal width of the circulation pump or must be dimensioned
according to the pump.
Inlet temperatures are not allowed to exceed 24 °C (75.2 °F) because otherwise there is an
increase in both solvent consumption and drying times.
Cooling water inlet temperatures that are too high can also overload the refrigeration unit.
The water pressure must be adapted to the high inlet temperature, up to double the peak demand.
In cooling tower or recooling operation, correct installation is especially important. Consequently, some of
the things that must be kept in mind are the cooler capacity, mains water supply switch-over, pump size
and cooling water by-pass.
The cooling water regulator (water economizer valve) must be corrected with a bypass (manual valve) for
the distillation system (= continuous water flow).
The cooling water regulator on the refrigeration unit can be replaced with a regulator with a larger
nominal width, if necessary.
The cooling water supply or the backfeeding to the rechiller should come from the mains water system or
from a soft water system.
41
P15: P18:
9 l/min 11 l/min
(2.4 US gal/min) (2.9 US gal/min)
7
P12-P15-P18