Operator responsibility – Safety instructions
10
2.3. Cooling water connection
Cooling water pressure (IN / OUT )
max.
4.5 bar
Difference pressure (IN - OUT )
2.0 to 4.5 bar
Rate of flow
typical
2 l/min
Recommended cooling water temperature range:
10-15 °C
Permissible cooling water temperature range:
5-35 °C
If the recommended cooling water temperature range is exceeded, performance restrictions are to be expected.
If the cooling water temperature is low, condensation may occur on the cooling circuit.
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of cooling water.
Due to its high content of lime, hard water is not suitable for cooling and causes scale in
the heat exchanger.
Ferrous water or water containing ferrous particles will cause formation of rust even in
heat exchangers made of stainless steel.
Chlorinated water will cause pitting corrosion in heat exchangers made of stainless steel.
Due to their corrosive characteristics, distilled water and deionized water are unsuitable
and will cause corrosion of the bath.
Due to its corrosive characteristics, sea water is not suitable.
Due to its microbiological (bacterial) components, which settle in the heat exchanger,
untreated and unpurified river water and water from cooling towers is unsuitable.
Avoid particulate matter in cooling water.
Avoid putrid water.
Recommended quality of cooling water:
pH
7.5 to 9.0
Sulfate [SO4 2- ]
< 100 ppm
Hydrocarbonate [HCO 3-]/sulfate [SO4 2-]
> 1 ppm
Hardness [Ca 2+, Mg 2+]/[HCO 3-]
> 0.5 dH
Alkalinity
60 ppm < [HCO 3-] < 300 ppm
Conductivity
< 500 μS/cm
Chloride (Cl -)
< 50 ppm
Phosphate (PO4 3-)
< 2 ppm
Ammonia (NH3)
< 0.5 ppm
Free chlorine
< 0.5 ppm
Trivalent iron ions (Fe 3+)
< 0.5 ppm
Manganese ions (Mn 2+)
< 0.05 ppm
Carbon dioxide (CO2)
< 10 ppm
Hydrogen sulfide (H2S)
< 50 ppm
Content of oxygen
< 0.1 ppm
Algae growth
impermissible
Suspended solids
impermissible