HP Performance Optimized Data Center (POD) 40cp Manuale Utente
Water quality requirements 30
Water quality requirements
Water quality requirements and 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.
Additionally, the water must not be so soft that it attacks the materials with which it comes into
Additionally, the water must not be so soft that it attacks the materials with which it comes into
contact.
•
The chilled water temperature to be supplied to the HP POD is 12º to 24ºC (55º to 75ºF). Freezing
water might cause a blockage and damage to the unit. In outside locations subject to 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,
the heat transfer potential of the water is lower, so the equipment must be derated properly.
the heat transfer potential of the water is lower, so the equipment must be derated properly.
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
(77ºF)
Specific conductance at 25ºC
(77ºF)
0–2500 µmhos/cm
Alkalinity ("M" as CaCO
3
) 150–1000
ppm
Sulfur (SO
4
) 0–150
ppm
Chloride (Cl)
0–100 ppm
Hardness (CaCO
3
) 0–350
ppm
Calcium hardness (CaCO
3
) 0–200
ppm
Magnesium hardness (CaCO
3
) 0–150
ppm
Copper (Cu)
< 0.20 ppm
Iron (Fe)
< 3.0 ppm
Aluminum (Al)
< 0.50 ppm
Sodium (Na)
0–1000 ppm
Silica (SiO
2
) 0–150
ppm
Zinc (Zn)
< 1.0 ppm
Manganese (Mn)
< 0.1 ppm
Phosphate Ortho- (PO
4
)
< 3 ppm
Bacteria
< 1000 CFU/ml
Suspended solids
< 10 ppm
If your water is out of range, consult a water quality expert.