10
1.7 Laying the condensate hose
It is advisable to lay the condensate hose as near to
the vertical as possible and to feed the condensate
either directly into an open funnel or below the
siphon.
If the steam-distribution pipe is fitted above the
humidifier, the condensate can be fed back to the unit
by placing the end of the hose in the filling cup.
In this instance, a small siphon should be formed with
the condensate hose.
If the condensate is drained off directly, it is advisable
to feed back the condensate hose separately. The
end of the condensate hose should be in the open air.
If the end of the hose is submerged in water,
the condensate is prevented from draining away.
Fig. 30
Condensate
fed back
to the unit
Condensate
drained off
separately
2. Water connections
2.1 Quality of the water
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; 7 to 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 CaCO3 (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.
2.2 Water intake and drainage
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.
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