Installation
30
300407956_002_C1 - 01/2017 - © Leybold
3.4 Connecting Cooling Water
Observe Safety Information 0.3.3 to 0.3.6.
Never stop supplying cooling water during the pump operation, otherwise,
the components of the pump will over-heat and can damage the pump.
According to the directions of water inlet and outlet from the pump, connect
the male and female quick joints to the front panel.
Ensure that the cooling water discharge is not constricted in any way.
Supply the cooling water and check for any leakage from the joints and the
pipe lines.
Do not connect pump cooling water loops in series. Select piping to ensure
sufficient and adequate flow through each pump in accordance with the
technical data.
The temperature of the discharged cooling water must not exceed 55 °C as
otherwise the lines will tend to calcify.
If work on the water cooling system becomes necessary and in the case of a
longer standstill or transportation, completely drain out all cooling water and
completely dry the lines (with nitrogen, for example).
Block or label the area of the cooling water and exhaust lines to prevent trip-
ping.
3.4.1 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 °dGH
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 %.
When using DS water/deionised water (softened or fully desalinated water) check
whether cooling system, water and materials used are suitable. For this please con-
sult us.
CAUTION
