HP Performance-Optimized Datacenter, 6 m (20 ft) User Guide

Water quality requirements 27
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.
The water cycle must be drained completely using compressed air before storage or transportation at
freezing temperatures or below.
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
Water precautions
Take the following precautions before installation of the HP POD:
• Verify that all foreign matter and particulates are flushed from the system. Water might be discolored
during the initial flushing of the system. Clear running water is the sign that all foreign matter and
particulates have been 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).
• Ensure facility managers are aware of 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.