HP Modular Cooling System Acceptable water quality specifications, Additional water precautions

available, the provided system pressure difference must be slightly higher than the maximum pressure loss with a fully opened control valve.

Acceptable water quality specifications

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. The water must not be so soft that it corrodes the materials that it comes into contact. You must periodically add new fresh water, and remove some of the enriched water. HP recommends a #30 mesh filter for filtering water fed to the MCS-200/100 and a 1 µm filter for prolonged performance.

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 (SO4), total	<100 ppm
Chloride (Cl)	<50 ppm
Sulfide (S)	<10 ppm
Hardness (CaCO3), 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: Contaminated water might cause decreased cooling capacity or disruption in service. The water flowing into the MCS-200/100 unit must meet the guidelines stated in the HP Modular Cooling System 200/100 Site Preparation Guide. Damage caused by contaminated water is not covered by the MCS unit warranty.

If your water is out of range, consult a water quality expert.

HP recommends using particulate filtration on the dedicated water supply system connected to the MCS-200/100 unit.

Additional water precautions

The following actions should be taken during the installation of the MCS-200/100:

•Be sure all foreign matter and particulates are flushed from the system prior to installing the water kits for the MCS-200/100.

•Evaluate the short- and long-term system requirements against available water capacity.

•Be sure your facility water loop is properly designed for liquid cooling systems and separate from the sanitary water systems within your building—for example, bathroom, sink, or drinking water.

Facility planning for implementation 78