HP Modular Cooling System manual Water quality requirements

Water quality requirements

Closed-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 µm 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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