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Figure 5.40
• Press 11 or 12 (Figure 5.38) to confirm the
value entered and return to the list of param-
eters (Figure 5.39).
• Press the 16 button (Figure 5.38) to exit
"programming mode".
5.16 Installing the external tempera-
ture sensor
(optional)
The external probe must be installed on an ex-
ternal wall of the building avoiding:
• Direct radiation of the sun's rays.
• Damp walls or walls where mould forms.
• Installation near fans, drain outlets or chim-
neys.
5.17 Electrical connection between
the boiler and the external sensor
To connect the external sensor to the boiler,
use electric cables with a cross section of no
less than 0.50 mm
.
2
The electrical conductors for connecting
the external sensor to the boiler must go
through different channels to those for the
mains voltage (230 V), as they are supplied
at a safe low voltage and cannot exceed 20
metres in length.
Use the control board terminals indicated in
Figure 5.41 to connect the external sensor.
The external sensor connection wires must
follow the path indicated of the ambient ther-
mostat and come through the back of the boil-
er.
INSTALLATION
RESET
bar
Boiler side
Voltage free contacts for
the Room thermostat
External
sensor
Figure 5.41
5.18 Enabling operation with the ex-
ternal sensor and setting the K
coefficient
The boiler is set with a K coefficient equal to
zero for boiler operation without the probe
connected.
The K coefficient is a parameter that increas-
es or decreases the boiler delivery tempera-
ture as the outdoor temperature varies.
When installing the external sensor, this pa-
rameter must be set based on the efficiency
of the heating system to optimise the delivery
temperature.
With heating temperature setting 28-55°C
(Figure 5.42) or temperature setting 50-80°C
(factory set) (Figure 5.43) (see "Selecting the
heating temperature set" on page 44).
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