40
External safety circuit
To guarantee the safety of the humidification 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,
airflow monitor, ventilation interlock, etc.) are
connected in series to the
contacts “SC1” and “SC2” of the terminal block “X6”
in accordance
with the wiring diagram.
DANGER!
Danger of electric hazard!
The mains voltage is connected to terminal block “X6” (up to 240 V). The
steam humidifier 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 “X6”.
Do not apply any
extraneous voltage
to the terminals.
The crosssection of the cable must comply with the applicable local regula-
tions (minimum of 1 mm
2
).
Control signal
–
External continuous humidity controller 0-10V (A1)
An external humidity continuous controller is to be connected to the
contacts “IN” (+) and “GND” (–) of the terminal block “X1”.
–
24 VDC On/Off humidistat (passive)
An 24 VDC On/Off humidistat is to be connected to the contacts “V+”
and “IN” of the terminal block “X1”.
Note: for the 24 VDC On/Off control a jumper must be set on “JP1” and
the jumper on “JP2” msut be removed.
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