Water quality and leveling requirements and
condensation management
Acceptable water quality specifications
The HPE Adaptive Rack Cooling System requires facility water to meet the conditions listed in the
following table for continuous quality of performance. Hewlett Packard Enterprise recommends using a
#30 mesh filter for water supplied to the HPE Adaptive Rack Cooling System.
The following values are water quality ranges required for continuous quality of performance.
Parameter
Range
pH
7-9
Specific conductance at 25ºC (77ºF)
<2500 µmhos
Sulfur (SO
4
), total
<100 ppm
Chloride (Cl)
<50 ppm
Sulfide (S)
<10 ppm
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:
Water that is out of spec might cause decreased cooling capacity or disruption in
service. The water flowing into the HPE Adaptive Rack Cooling System must meet the guidelines
stated in this guide. Damage caused by contaminated water is not covered by the HPE Adaptive
Rack Cooling System warranty.
If your water is out of range, consult a water quality expert.
Hewlett Packard Enterprise recommends using particulate filtration on the dedicated water supply system
connected to the HPE Adaptive Rack Cooling System.
Frost damage
To avoid frost damage, the water temperature must not fall below the minimum permissible temperature
of +0 ºC (+32ºF) at any point in the water cycle.
Before storage or transportation at subzero temperatures, the water cycle must be drained completely
using compressed air. Avoid setting the target temperature lower than necessary because the danger of
falling below the dew point increases as water temperature decreases. Ensure that the racks are sealed
on all sides, especially at the cable inlet to prevent condensation formation.
Water quality and leveling requirements and condensation management
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