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Description
3.3 Re-cooling unit
3.3.3
The external raw water circuit
The raw water flows through the heat exchanger. The heat exchanger cools the deionized
water.
If other raw water specifications apply, titanium heat exchanger plates or tube bundle heat
exchangers are available (optional).
NOTICE
Deposits of suspended solids
If you reduce the flow rate to reduce the raw water usage, then deposits of suspended solids
can build up in the heat exchanger as a result of the slow flow rate.
These suspended solids can then cause the cooling system to fail. The drive could be
damaged.
Only reduce the raw water flow rate if the raw water does not have any suspended solids.
Raw water requirements
Table 3-2
Size of entrained particles
pH value
Carbonate hardness
Total hardness
Chloride
Sulfate
Nitrate
Core
Ammonia
Dissolved solids
Where values deviate from the above stated, a water analysis should be carried out in order
to ensure the long-term stability of the heat exchanger.
32
Raw water requirements
Value
< 0.5 mm
6.5 to 8.0
< 0.9 mMol/l (5 °dH)
< 1.7 mMol/l (9.5 °dH)
60 mg/l
80 mg/l
10 mg/l
0.2 mg/l
10 mg/l
<3.4 mMol/l (340 ppm)
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015
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