39
and
.
Standard display will return by pressing
the key
again, or after 10 seconds if
no key is pressed.
Regulation of the external sensor (fig.
25/a)
If an external sensor is installed, the
value of the output temperature is au-
tomatically chosen by the system, which
quickly adjusts the environmental tem-
perature on the basis of the external
temperature.
If you wish to change the value of the
temperature, increasing or decreasing
that calculated automatically by the elec-
tronic card, proceed as indicated in the
preceding paragraph.
The level of various correction of a value
of temperature proportional calculated.
The display will be as shown in fig. 25/a.
TO SWITCH OFF THE BOILER
(fig. 24)
In the case of a short absence, press the
key (
) of the controls (pos. 2).
The display will be as shown in the fig.
24. In this way, leaving the electricity and
the fuel supply connected, the boiler is
protected from frost and from the pump
becoming jammed.
If the boiler is not used for a prolonged
period, it is advisable to disconnect the
electricity supply, by switching off the
main switch of the system, and to clo-
se the gas tap and, if low temperatures
are expected, to completely empty the
hydraulic circuits to avoid pipes being
damaged by frost.
ERRORS AND SOLUTIONS
When there is a functioning error,
the display shows an alarm and the
blue luminous bar becomes red.
Descriptions of the errors with the
relative alarms and solutions are gi-
ven below:
–
ALARM 02 (fig. 27/a)
If the water pressure detected is
lower than 0.5 bar, the boiler will
stop and the display will show
“ALL 02”.
Using the external filling device,
repressurise the heating system
until the pressure indicated by the
display is between 1 and 1.5 bars.
If it is necessary to repeat the re-
filling procedure, it is advisable
to contact qualified technical per-
sonnel to check the soundness
of the heating system (to check
whether there are any leaks).
Fig. 27/a
–
ALL 03
Request assistance from quali-
fied technical personnel.
–
ALL 04
Request assistance from quali-
fied technical personnel.
–
ALL 05
Request assistance from quali-
fied technical personnel.
–
ALL 06 (fig. 27/c)
Press the key
of the controls
(2) to re-start the boiler.
If the error persists, request as-
sistance from qualified technical
personnel.
2
Fig. 27/c
–
ALL 07 (fig. 27/d)
Press the key
of the controls
2
Circuito
riscaldamento 2
Circuito
riscaldamento 3
(impianto tre
zone)
Fig. 25
Fig. 25/a
Heating circuit 2
Heating Circuit 3, when
fi tted.
