n Hard water is unsuitable for cooling due to the high lime content and will
lead to calcification of the cooling water circuit.
n Cooling water containing suspended matter is unsuitable.
n Untreated, unpurified water such as river water or cooling tower water is
unsuitable due to its microbiological content (bacteria), which can settle
inside the cooling water circuit.
Data Value Unit
pH value
7.5 - 9.0
---
Hydrocarbonate [HCO
3
-
]
70 - 300
mg/L
Chloride < 50 mg/L
Sulfate [SO
4
2-
]
< 70 mg/L
Ratio hydrogen carbonate [HCO
3
-
] / sul-
fate [SO
4
2-
]
> 1 ---
Total water hardness
4.0 - 8.5
°dH
Electrical conductivity
30 - 500
μS/cm
Sulfite (SO
3
2-
)
< 1 mg/L
Free chlorine gas (Cl
2
) < 0.5 mg/L
Nitrate (NO
3
-
)
< 100 mg/L
Ammonia (NH
3
) Not permitted ---
Iron (Fe), dissolved < 0.2 mg/L
Manganese (Mn), dissolved < 0.05 mg/L
Aluminum (Al), dissolved < 0.2 mg/L
Free aggressive carbon dioxide (CO
2
) Not permitted ---
Hydrogen sulfide (H
2
S) Not permitted ---
Algae growth Not permitted ---
Suspended matter Not permitted ---
4.3.2 Connecting the cooling water
Specification Value
Maximum cooling water
pressure
10 bar
Dierential pressure cooling
water rp
1 – 6 bar VC 1200 W and VC 2000 W
3 – 6 bar VC 3000 W and higher
Cooling water temperature approx. 15 °C recommended, 10 – 30 °C
permitted (in upper range with performance
restrictions)
Suitable cooling water quality
V08 Variocool 27 / 97
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