14
voltage and frequency as indicated on
the rating plate of the unit. The units
are manufactured with double electri-
cal insulation (Class II) and therefore
they do not need an earth connection.
In addition to the switch shown in the
installation drawing/diagram, there
must be an All Pole switch in the fi xed
wiring with a contact opening of min 3
mm.
The electrical cable must enter the SI-
LENT DESIGN through the cable entry
(4).
Once the cable has been introduced
proceed using the electrical wiring dia-
gram applicable to the selected model.
SILENT CHZ DESIGN
Models provided with an electronic hu-
midistat which can be adjusted from
60% to 90 % RH (Relative Humidity) and
with a timer, adjustable between 1 and
30 minutes. The desired humidity level
and run on time are selected by means
of 8 dip-switches placed on the print-
ed circuit board, and easily accessible.
Each dip-switch has two positions [ON
(1) and OFF (0)] which are selected with
the small plastic screwdriver supplied
with the fan:
The functions of these dip-switches are:
– Switch 1: “Interval” function selec-
tion (yes or no)
– Switches 2 and 3: Interval time set-
tings between 4, 8, 12 and 24 hours
– Switches 4 and 5: Humidistat set-
tings between 60, 70, 80 and 90%
– Switches 6 and 7: Over-run timer
settings between 1, 5, 15 and 30
minutes
– Switch 8: Start-up timer function
(yes or no)
Automatic operation
The extractor is connected to the main
supply with only two wires (Fig.4)
(Fig.6). The humidistat causes the ex-
tractor to operate automatically when
the humidity level in the room is higher
than the set level. The extractor will
stop automatically when the humidity
drops below the selected level (-5% or
+10%) and after the selected period set
on the over-run timer.
“Interval” functions
This function is useful when the extract
fan is installed in very wet (near the
sea) or the ambiance exceeds the set
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