Installation
38 300855170_002_C8 - 08/2021 - © Leybold
3.6.3 Water quality
In order to ensure long trouble-free operation the cooling water must not
contain any oils, greases and suspended solids. Moreover, we recommend
compliance with the following limit values:
Appearance Clear, free of oils and greases
Suspended matter < 250 mg/l
Particle size < 150 µm
Electrical conductivity < 700 µS/cm
pH value 7.0 to 9.0
Total hardness (total alkaline earths) < 8 °dH
Aggressive carbon dioxide None, not detectable
Chloride < 100 mg/l
Sulphates < 150 mg/l
Nitrate ≤ 50 mg/l
Iron < 0.2 mg/l
Manganese < 0.1 mg/l
Ammonium < 1.0 mg/l
Free chlorine < 0.2 mg/l
8 °dH (degrees German hardness) = 1.4mmol/l
= 10 °e (degrees English hardness)
= 14 °f (degrees French hardness)
If there is the danger of frost, you may use a water glycol mixture of up to 30 %.
DS water (softened or fully desalinated water) can be used for cooling the pump, if
the pH value corresponds to the range indicated above.
Fig. 3.9 Connect the water cooling to the TURBOVAC 1350 i and 1450 i
Hose connection for
hose 6x1
Cooling water OUT
Cooling water IN
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