HP Modular Cooling System - Manual (Page 64)

Water quality and leveling requirements, and condensation management 64
Parameter Range
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 MCS
5042 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 5042 unit:
• Before installing the HP mc-Series 5042 Rack 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
• Non-stainless steel Iron components