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The manufacturer's guarantee and liability will be rendered void in cases of incorrect use and treat-
ment of the cooling unit. To prevent problems in the coolant/heat transfer circuit (also on water-
cooled units), it is imperative that the VEB Cooling Water Guidelines (VGB-R 455 P) are observed (for
source, see chapter 12). Portion of antifreeze in the cooling medium, see chapter 11.
The cooling medium and/or cold water must not cause any lime scale deposits or loose debris. In
other words, it should have a low level of hardness, particularly a low level of calcium hardness. In
particular, the level of calcium hardness should not be too high when using the equipment for circu-
lated cooling. On the other hand, the cooling medium should not be so soft that it attacks the mate-
rials. When cooling the cooling medium, the salt content should not be allowed to increase exces-
sively due to the evaporation of large quantities of water, since the electrical conductivity will
increase as the concentration of dissolved substances rises, and the cooling medium will become
more corrosive. For this reason, not only is it always necessary to add a corresponding quantity of
fresh water, but also to remove part of the enriched cooling medium.
Hydrological data
Hydrological data
Hydrological data
Hydrological data
The properties of the water used should not deviate from the hydrological data listed below. The lo-
cal drinking water values are to be noted.
Properties
Properties
Properties
Properties
Value
Value
Value
Value
p
H
value
(7) 7.5 – 8.5
Elec. conductivity
200 – 1000 µS/cm
Residue on evaporation
< 500 mg/dm³
Sedimentary substances
< 3 mg/dm³
Hardness
3 – 8°dH (for German-speaking region)
Ca + Mg
0.5 – 2 mmol/l (for international region)
Hydrogen carbonate
1 – 5 mmol/dm³ (60 – 300 mg/dm³)
Free CO
2
< 10 mg/dm³
Sulphide
< 0.01 mg/dm³
Chloride
< 50 mg/dm³
Sulphate
< 250 mg/dm³
Nitrate
< 25 mg/dm³
Nitrite
< 0.1 mg/m³
COD
< 7 mg/dm³
NH
4
< 0.05 mg/dm³
FE
< 0.1 mg/dm³
Mn
< 0.1 mg/dm³
Cu
< 0.1 mg/dm³
Note!
Note!
Note!
Note!
To be 100% certain the water quality is appropriate, we recommend the usage of
water-glycol mix. This is a ready-to-use mixture that can be used straight away.
Summary of Contents for nBoxX 1.5
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