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10. Connection of the
external probe
(accessory on demand)
The boiler is prearranged for the connection of an external probe, supplied
as accessory on demand, which automatically regulates the heating fl ow
temperature depending on the outside temperature and on the set Kt
coeffi cient.
For the installation of this accessory see the fi gure below and the instruc-
tions supplied with the external probe.
oce_010706_0900
Figure 9: External probe connection
BOILER PCB
EXTERNAL PROBE
CONTROL
PANEL OF THE
BOILER
10.1. Installation and connection of the external
probe
The external probe has to be installed on an external wall of the building
observing the following advices:
• Install it on a wall which is situated in the north-north/east direction,
avoiding the direct radiation of the sun rays.
• Avoid damp and mouldy walls.
• Verify the wall is suffi ciently thermal isolated.
• Avoid its installation near electric fans, fl ue pipes or chimneys.
Fix the external probe to the wall with the two plugs supplied with the
probe, following the technical instructions supplied with the probe.
Electrical connection of the external probe has to be done using two wires
having a minimum section of 0.5 mm
2
and a maximum length of 20 m
(it is not necessary to respect the polarity).
The connecting cable boiler-probe has to be fi xed on one side to the
terminal board of the probe (blocking it with its sealed cable clamp) and
on the other side to the terminal board present on the boiler.
The cable has to come out from the boiler through one of the cable clamp
present on the boiler.
