HP Modular Cooling System - Manual (Page 61)

Water quality and leveling requirements, and condensation management 61
Parameter Range
Hardness (CaCO
3
), total <200 ppm
Iron (Fe), total <3.0 ppm
Manganese (Mn), total <0.1 ppm
Bacteria <1000 CFUs/ml
Residue on evaporation <500 ppm
Turbidity 20
Corrosion inhibitor Recommended
CAUTION: Contaminated water might cause decreased cooling capacity or disruption in
service. The water flowing into the MCS-200 unit must meet the guidelines stated in the HP
Modular Cooling System Site Preparation Guide. Damage caused by contaminated water is not
covered by the MCS unit warranty.
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 MCS-200
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-200 unit:
• Before installing the HP Modular Cooling System 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).
• Ensure facility managers understand the additional load being added to the chilled water supply of the
building. Be aware that the added heat load might affect other components being cooled by the chilled
water plant.
Plumbing materials to avoid
Do not use the following materials in a closed water system:
• Oxidizing biocides
• Aluminum components
• Brass components with high levels of zinc