HP Modular Cooling System Installationshandbuch PDF herunterladen (Seite 51)

Water quality requirements

osed-loop water must not contain any lime scale deposits or loose debris. The water must have a

low level of hardness, particularly a low level of carbon hardness. Filters must be used to remove free

floating particulates and regularly maintained. Additionally, the water must not be so soft that it

corrodes the materials that it comes into contact. You must periodically add new fresh water, but also

you to remove some of the enriched water. HP recommends a #30 mesh filter for filtering water fed to

the MCS 5042 and a 1 μ

filter for prolonged performance.

Note:

If water quality specifications are out of range, consult a water quality

expert.

Table 12: Water quality ranges required for continuous quality of performance for the MCS 5042 liquid cooling system

Parameter Range (See above note)

pH 7 to 9

Specific Conductance, at 25° C, μmhos <2500

Sulfur, Total, as SO4, ppm <100

Chloride, as Cl, ppm <50

Sulfide, as S, ppm <10

Hardness, Total, as CaCO3, ppm <200

Iron, Total, as Fe, ppm <3.0

Manganese, Total, as Mn, ppm <0.1

Bacteria, CFUs/ml

<1000

Residue on evaporation, ppm <500

Turbidity, NTU 20

Corrosion inhibitor Recommended

Caution:

Contaminated water might cause decreased cooling capacity or disruption

in service. The water flowing into the MCS 5042 unit must meet the

guidelines stated in the HP mc-Series 5042 Rack Site Preparation Guide.

Damage caused by contaminated water is not covered by the MCS unit

warranty.

Note:

HP recommends that particulate filtration be implemented into the

dedicated water supply system feeding each MCS 5042.

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HP Modular Cooling System Installationshandbuch Seite 51