Nordmann ES4 - Page 50

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Control voltage supply
CAUTION!
– Before connecting, ensure that the mains voltage corresponds with
the control voltage of the unit (230 V/1 50…60 Hz).
– The humidier must only be connected to a mains supply with a
protective conductor.
The connection to the control voltage is made in accordance with the wir-
ing diagram, to the terminal “X3” on the power board. The customer is to
install a service switch Q3 in the supply line (all pole disconnecting device
with a minimum contact opening of 3 mm) and an F3 fuse (max. 10 A slow
acting) (these are both essential requirements).
The crosssection of the mains cable must comply with the applicable local
regulations (minimum of 1.5 mm
2
).
External safety circuit
To guarantee the safety of the humidication system, monitoring the opera-
tion by means of a safety circuit is an absolute requirement.
To accomplish this, the potential-free contacts (max. contact loading
250V/5A) of external moni t or ing devices (e.g. safety high limit humidistat,
airow monitor, ventilation interlock, etc.) are connected in series to the
contacts “SC1” and “SC2” of the terminal block “X3” in accordance
with the wiring diagram.
DANGER!
Danger of electric hazard!
The mains voltage is connected to terminal block “X3” (up to 240 V). The
steam humidier must therefore be isolated from the mains supply (heat-
ing and control voltage), before starting the connection work.
If, for whatever reason, no external monitoring devices are connected, a
connecting bridge “J” must be installed on the contacts “SC1” and “SC2” of
the terminal block “X3”.
Do not apply any extraneous voltage to the terminals.
The crosssection of the cable must comply with the applicable local regula-
tions (minimum of 1 mm
2
).