2.1 Quality of the water
2.2 Water intake and drainage
Connecting to the cold-water supply, with stop cock
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NORDMANN humidifiers use ordinary tap water for the production of
pure steam. The electrical conductivity should be between 125 and 1250
microsiemens per cm.
The hardness of water is measured in accordance with the international
unit millimol, calcium and magnesium ions per litre (mmol/l), previously
the degree of German hardness (DH):
Soft water:
up to 1.3 mmol/l; up to 7° DH
Fairly hard water:
1.3 to 2.5 mmol/l; to 7-14° DH
Hard water:
2.5 to 3.8 mmol/l; 14 to 21° DH
Very hard water:
over 3.8 mmol/l; over 21° DH
Other international units:
1° DH = 1.79° French hardness
1° DH = 1.25° English hardness
1° DH = 1.05° American hardness
1° DH = 10 mg/l CaO
1° DH = 17.9 mg/l CaCO
3
(ppm)
NORDMANN’s electrode steam humidifiers allow you to use water ranging
from soft to very hard, without the need for prior treatment. However,
for fairly hard water and above, we recommend the use of the SC system
(NORDMANN’s self-cleaning system), since this greatly reduces the
amount of maintenance required for the cylinder.
All installation work must be performed by trained personnel.
The customer himself is responsible for verifying their qualifications.
Please observe local regulations concerning the connection of appliances
to the pressure and drainage systems.
The humidifiers are designed to operate on ordinary tap water. If you
intend using treated or de-mineralised water, consult your NORDMANN
representative beforehand.
Where the water pressure is between 1 and 10 bar (0.1 to 1 MPa), the unit
can be connected directly to the water supply. If it is over 10 bar (1 MPa),
connection must be via a pressure-reduction valve (set to 4-6 bar,
= 0.4-0.6 MPa).
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2. Water connections
