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• Press the 17 button to set "1 9 8", then
press 13 to confirm the 8 and go back to
the list of parameters.
• Press button 13 and hold until the LCD
display shows the code A21, indicating
entry into "parameter A21" (Figure 5.26).
Figure 5.26
• By using buttons 16 or 17 (Figure 5.23) it
is possible to modify the value of parame-
ter A21 (Figure 5.27).
00 = Room thermostat
01 = Remote control
Figure 5.27
• Press 13 or 14 (Figure 5.23) to confirm the
value entered and return to the list of pa-
rameters (Figure 5.26).
• Press the 18 button (Figure 5.23) to exit
"programming mode".
5.15 Installing the external tempera-
ture sensor
(optional)
The external sensor must be installed on an
external 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
chimneys.
- 44 -
INSTALLATION
RESET
bar
RESET
bar
5.16 Electrical connection between
the boiler and the external sen-
sor
To connect the external sensor to the boiler,
use electric cables with a cross section of
no less than 0.50 mm
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 can-
not exceed 20 metres in length.
Use the control board terminals indicated in
Figure 5.28 to connect the external sensor.
The external sensor connection wires must
follow the path indicated of the ambient
thermostat and come through the back of
the boiler.
Boiler side
Volt-free contacts for
the ambient thermostat
External
sensor
Figure 5.28
5.17 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.
.
2
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