HP Performance Optimized Data Center (POD) 20cp manual

Water quality requirements

Water quality requirements and specifications

•Closed-loop water must not contain any lime scale deposits or loose debris.

•The chilled water temperature to be supplied to the HP POD must be 12º to 24ºC (55º to 75ºF).

NOTE: Freezing water might cause a blockage and damage to the unit. In outside locations subject to freezing temperatures, an additive such as glycol might be necessary to lower the freezing point. However, since the heat transfer potential of water with glycol is lower, the HP POD must be derated accordingly.

NOTE: The water cycle must be drained completely, and then purged using compressed air when storing or transporting at or below freezing temperatures.

Acceptable water quality specifications

Water must be maintained per the following acceptable water quality standards.

Parameter	Range

pH	8.0–10

Specific conductance at 25ºC	0–2500 µmhos/cm
(77ºF)

Alkalinity ("M" as CaCO3)	150–1000 ppm
Sulfur (SO4)	0–150 ppm
Chloride (Cl)	0–100 ppm

Hardness (CaCO3)	0–350 ppm
Calcium hardness (CaCO3)	0–200 ppm
Magnesium hardness (CaCO3)	0–150 ppm
Copper (Cu)	< 0.20 ppm

Iron (Fe)	< 3.0 ppm

Aluminum (Al)	< 0.50 ppm

Sodium (Na)	0–1000 ppm

Silica (SiO2)	0–150 ppm
Zinc (Zn)	< 1.0 ppm

Manganese (Mn)	< 0.1 ppm

Phosphate Ortho- (PO4)	< 3 ppm
Bacteria	< 1000 CFU/ml

Suspended solids	< 10 ppm

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

Water quality requirements 15