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