HP Modular Cooling System Site Preparation Guide

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 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 and a 1µm filter is suggested for prolonged performance.
Table 10 lists the water quality ranges required for continuous quality of performance for the HP
MCS liquid cooling system.
Table 10. Acceptable Water Quality Specifications for the HP MCS
Parameter Range (see note)
pH 8.0-10
Specific Conductance, at 25°C, µmhos 10-2500
Alkalinity, "M" as CaCO
3
, ppm 150-1000
Sulfur, Total, as SO
4
, ppm 0-150
Chloride, as Cl, ppm 0-100
Hardness, Total, as CaCO
3
, ppm 0-350
Calcium Hardness, Total, as CaCO
3
, ppm 0-200
Magnesium Hardness, Total, as CaCO
3
, 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 0-1000
Silica, Total, as SiO
2
, ppm 0-150
Zinc, Total, as Zn, ppm <1.0
Manganese, Total, as Mn, ppm <0.1
Phosphate, Ortho-, as Po
4
, 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 feeding each HP Modular Cooling
System.
HP MCS Site Preparation Guide
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