Instruction Manual ZHK
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V07-21.0
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pH-value: should be kept as high as possible; but at least 7,5
-
Cl
2
:
continuous
< 0,5 ppm near the plate heat exchanger inlet
maximum
< 2 ppm
-
Cl
-
< 150 ppm, if the water is heated to
50
–
60 °C
< 100 ppm, if the water is heated to
70
–
80 °C
6.2 Humidifier, indirect adiabatic cooling
Humidification systems function in the supply air flow as an air humidifier, as well as in the exhaust
air flow as an indirect adiabatic cooling. In the following, reference will always be made to humidifi-
ers in the supply air flow, but the information is valid for both applications, unless explicitly stated
otherwise.
6.2.1 Water quality
At the water supply of a humidifier, for instance spray humidifier, pay attention to the water quality.
Depending on the water hardness and the operational importance of the device, an appropriate
water treatment process must be chosen in order to ensure the desired water quality. Pay particu-
lar attention to the carbonate hardness in fresh water. The water treatment system is not supplied
by EUROCLIMA and must be provided by the customer on site. In order to reach sufficient opera-
tional safety limits, the circulation water quality should be within following range:
Quality
Air conditioning system for
Standard climate
requirements
Data-processing
areas
Sterile and clean
rooms
Appearance
Clear, colorless and without sediment
pH-value
7
–
8,5
Total salt content
GSG
g/m³
< 800
< 250
< 100
El. conductivity
(at reference tempera-
ture 20 °C)
mS/m
< 100
< 30
< 12
µS/cm
< 1000
< 300
< 120
Calcium
Ca
++
mol/m³
> 0,5
-
g/m³
> 20
-
Carbonate hardness
KH
°dH
< 4
-
Carbonate hardness
with hardness stabili-
zation
KH
°dH
< 20
-
Chloride
Cl
-
mol/m³
< 5
-
-
g/m³
< 180
-
-
Sulphate
SO
4--
mol/m³
< 3
-
-
g/m³
< 290
-
KMnO
4
-consumption
g/m³
< 50
< 20
< 10
Germ count
KBE/ml
< 1000
< 100
< 10
Legionella bacteria
KBE/ml
< 1
Table 8:
Water quality of supply of humidifier following VDI 3803
The necessity of a stationary sterilization facility depends mainly on the operational conditions and
must be checked for each single case.
Summary of Contents for ZHK
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