11
Connecting to the cold-water supply, with stop cock
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).
In any case, the water feed pipes that you have laid
must be flushed thoroughly before connecting them
to the humidifier. You should use copper piping only.
Note that the drainage facility should provide the
possibility of performing cleaning and maintenance.
The drainage pipe should have a decline to the
drainage system of at least 5%.
A fine filter should be fitted at the water intake to
the humidifier; this prevents the rapid build-up
of impediments in the inlet filter of the inlet valve.
3. Electrical connections
3.1 Safety instructions
All work pertaining to the electrical installation must be carried out by qualified personnel only. The customer is
responsible for verifying the qualifications of the technicians concerned.
Before performing any electrical work, all power to the humidifier must be disconnected. Please observe local
regulations concerning electrical installations. The installation must be fitted with a device which disconnects the unit
(with a contact opening of at least 3 mm) on all phases from the mains power supply. NORDMANN humidifiers
are designed to be connected to the earth lead and are categorised as belonging to Protection class 1 for electrical
equipment. The connection details are provided in the wiring diagrams for each type of unit. Each unit is supplied
with the appropriate wiring diagram.
!
Fig. 31
Tap (supplied
by customer)
Drainage cup
horizontal
or vertical
Fine filter
(supplied by
customer)
3/4“
3/8“
3.2 Control voltage
The standard control voltage of 220–240 V must be applied to terminals L1 and N. A 6.3A spare fuse (F1),
located in the terminals of the fuse holder, is incorporated in the humidifier. The electronics and the accessories have a
24 V power supply which is protected by a fuse (F2). A spare fuse is situated in the terminals of the fuse holder.
N.B.: When performing cleaning and maintenance work on the unit, all power to the humidifier, including the
control voltage, must be disconnected.
3.3 Heating voltage
The cross-section of the electrical wires and the minimum fuse size should be chosen in accordance with the
connection requirements (cf. technical specifications) of the type of humidifier employed. The electric supply cables
must be connected to the unit’s terminals correctly. We recommend to re-tighten the screw terminals after a few days.
