Installation
32
GA03108_002_C1 - 04/2018 - © Leybold
3.3 Connecting the Cooling Water
(for some motor versions)
Connect the cooling water. Ensure an adequate cooling water flow, see
Technical Data.
Secure the cooling water connections with Loctite 572.
First open the cooling water discharge and then the cooling water supply.
Otherwise a water pressure can build up in the pump which is too high.
When shutting off the cooling water supply proceed in the reverse order:
first shut off the supply and then open the drain.
Notice safety information 0.3.3.
3.3.1 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
Sulfate
< 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.
CAUTION
