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External sensor (optional)
Connect the sensor to its respective terminals 8 and 9 in appliance terminal block. The maximum per-
missible length of the electric cable connecting the boiler - external sensor is 50 m. A common 2-wire
cable can be used.
The external sensor must be installed on the North, North-West wall or on the wall with most of the
main living room. The sensor must never be exposed to early morning sunshine and in general, as far as
possible, it must not be hit directly by the sun's rays; if necessary, it should be protected (fig. 8b).
In any case, the sensor must never be fitted near windows, doors, ventilation openings, flues or sources
of heat that could affect the reading (fig. 8a).
16
Fig. 8a
N
N W
Fig. 8b
Maxima 35 C
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