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HP Modular Cooling System User Manual Page 76

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Maintenance 76
Parameter Range
Specific conductance at 25ºC
(77ºF)
10–2500 µmhos
Alkalinity ("M" as CaCO
3)
150–1000 ppm
Sulfur (SO
4
) 0–150 ppm
Chloride (Cl) 0–100 ppm
Hardness (CaCO
3
) 0–350 ppm
Calcium hardness (CaCO
3
) 0–200 ppm
Magnesium hardness (CaCO
3
) 0–150 ppm
Copper (Cu) < 0.20 ppm
Iron (Fe) < 3.0 ppm
Aluminum (Al) < 0.50 ppm
Sodium (Na) 0–1000 ppm
Silica (SiO
2
) 0–150 ppm
Zinc (Zn) < 1.0 ppm
Manganese (Mn) < 0.1 ppm
Phosphate Ortho- (Po
4
) < 3 ppm
Bacteria < 1000 CFU/ml
Suspended solids < 10 ppm
If your water is out of range, consult a water quality expert.
HP recommends using particulate filtration on the dedicated water supply system connected to the HP
Modular Cooling System G2 unit.
Frost damage
To avoid frost damage, the water temperature must not be allowed to fall below the minimum permissible
temperature of +4 ºC (+39.2 ºF) at any point in the water cycle.
Before storage or transportation at sub-zero temperatures, the water cycle must be drained completely
using compressed air. Avoid setting the target temperature lower than is necessary because the danger of
falling below the dew point increases as water temperature decreases (condensation buildup). Ensure that
the enclosure is sealed on all sides, and in particular at the cable inlet (condensation formation).
Water precautions
Take the following precautions during the installation of the MCS G2 unit:
• Before installing the HP Modular Cooling System G2 Hook-Up Kit, ensure that all foreign matter and
particulates are flushed from the system.
• Evaluate the short-term and long-term system requirements against the available water capacity.
• Ensure that the chilled water loop is properly designed for liquid cooling systems and is separate
from the sanitary water systems in your building (bathroom, sink, drinking water, and so on).
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