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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 of the machine 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), maximum pressure 6.0 bar (87 psi)
Peak cooling water demand 2 - 4 bar (29 - 58 psi) (12 °C/53.6 °F):
M21, M26, M30
Drying/detergent solution cooler
Distillation
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 the solvent
consumption increases and the drying times are also longer.
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, stored cooling capacity, pump size and cooling water by-pass.
The cooling water regulator (water economizer valve) for the machine and distillation system must
be corrected or avoided with a bypass (manual valve) (= continuous water flow).
The cooling water supply or the backfeeding to the recooling unit must come from the mains water
system or from a soft water system.
28
28
6
l/min (1.6 US gal/min)
14l/min (3.7 US gal/min)
7
M21/M26/M30
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