HP Modular Cooling System Generation 2 site preparation guide - Technical white paper

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Water quality requirements
Closed-loop water must not contain any lime scale deposits or loose debris. The water should have a
low level of hardness, particularly a low level of carbon hardness. Filters should be used to remove
free-floating particulates and be regularly maintained. Additionally, the water should not be so soft
that it attacks the materials with which it comes into contact. It is necessary to periodically add new
fresh water, but also to remove some of the enriched water. A #30 mesh filter is recommended for
filtering water fed to the HP MCS G2 and a one-micrometer filter is suggested for prolonged
performance. Table 12 lists the water quality ranges required for continuous quality of performance
for the HP MCS liquid cooling system.
Table 12: Acceptable water quality specifications for the HP MCS G2
Parameter
Range (see note)
pH
8.0–10
Specific conductance, at 25°C, µmhos
10–2,500
Alkalinity, ―M‖ as CaCO3, ppm
150–1,000
Sulfur, total, as SO4, ppm
0–150
Chloride, as Cl, ppm
0–100
Hardness, total, as CaCO3, ppm
0–350
Calcium hardness, total, as CaCO3, ppm
0–200
Magnesium hardness, total, as CaCO3, ppm
0–150
Copper, total, as Cu, ppm
<0.20
Iron, total, as Fe, ppm
<3.0
Aluminum, total, as Al, ppm
<0.5
Sodium, as Na, ppm
0–1,000
Silica, total, as SiO2, ppm
0–150
Zinc, total, as Zn, ppm
<1 .0
Manganese, total, as Mn, ppm
<0.1
Phosphate, Ortho-, as PO4, ppm
<3
Bacteria
<1000 CFU/ml
Suspended solids, ppm
<10
Note:
Consult a water quality expert if out of range.
Note:
HP recommends that particulate filtration be implemented into the
dedicated water supply system that feeds each HP MCS.
Caution:
Contaminated water may cause decreased cooling capacity or disruption
in service. It is important that the water flowing into the MCS unit meets the
guidelines stated in the HP MCS site preparation guide. Damage caused
by contaminated water is not covered by the HP MCS unit warranty.