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3.4
EXTERNAL
ENG
SENSOR
FR
If there is an external sensor, the heating
settings SET can be taken from the climatic
curves according to the external tempera-
ture and, in any case, limited to with the
range values described in point 3.3 (para-
meters PAR 25 for zone 1 and PAR 26 for
zone 2).
The climatic curve to be set can be selected
from a value of 3 and 40 (at step 1).
Increasing the steepness of the curves of
fig. 13 will increase the output temperature
as the external temperature decreases.
3.5
CARD FUNCTIONING
The electronic card has the following func-
tions:
– Antifreeze protection of the heating and
sanitary water circuits (ICE).
– Ignition and flame detection system.
– Control panel setting for the power and
the gas for boiler functioning.
– Anti-block for the pump which is fed for a
few seconds after 24 hours of inactivity.
– Antifreeze protection for boilers with an
accumulation boiling unit.
– Chimney sweep function which can be acti-
vated from the control panel.
– Temperature which can be shifted with the
external sensor connected. It can be set
from the control panel and is active on the
heating systems of both circuit 1 and cir-
cuit 2.
– Management of two independent heating
circuit systems.
– Automatic regulation of the ignition power
and maximum heating. Adjustments are
managed automatically by the electronic
card to guarantee maximum flexibility in
use of the system.
3.6
TEMPERATURE
DETECTION SENSOR
Table 4 shows the resistance values of the
heating, DHW and exhaust fumes thermi-
stors.
If the heating sensor (SM) is faulty or
open circuit, the boiler will not function on
either heating or DHW (ALL 05).
If the exhaust fumes sensor (SF) is faulty
or open circuit, the boiler will not function
on either heating or DHW (ALL 14).
If the DHW sensor (SS) is faulty or open
circuit, the boiler will work without modu-
lation to the DHW temperature.
34
°F
212
194
176
158
140
122
104
86
68
50
ATTENTION: les courbes sont calculées avec une
température ambiante de 20 °C (68°F). L'utilisateur
peut intervenir sur les commandes de la chaudière
pour les varier de ±5°C (±9°F).
TABLEAU 4 (SM - SS - SF sondes)
Tempèrature (°C/°F)
Résistance (Ω)
20/68
12.090
30/86
8.313
40/104
5.828
50/122
4. 1 61
60/140
3.021
70/158
2.229
80/176
1.669
3.7
ELECTRONIC
IGNITION
Ignition and flame detection is controlled by
a single electrode on the burner which gua-
rantees reaction in the case of accidental
extinction or lack of gas within one second.
3.7. 1
Functioning cycle
Burner ignition occurs within max. 10
seconds after the opening of the gas valve.
Ignition failure with consequent activation of
block can be due to:
– Lack of gas
The ignition electrode persists in dischar-
ging for max. 10 seconds. If the burner
does not ignite, the anomaly is signalled.
This can happen the first time the boiler
is switched on after a long period of inac-
tivity due to the presence of air in the gas
pipes
It can be caused by a closed gas tap or by
a broken valve coil (the interruption does
32
14
-4
-22 °F
not allow for opening).
– The electrode does not discharge.
In the boiler, only the opening of the gas
to the burner can be detected. After 10
seconds the anomaly is signalled. It can
be caused by an interruption in the elec-
trode wire or if it is incorrectly anchored
to the connection points. Or the electro-
de may be earthed or strongly worn: it
must be replaced.
Or the electronic card may be defective.
– No flame detected
After start-up the electrode continues to
discharge even when the burner is on.
After 10 seconds, the discharge stops,
the burner is switched off and a fault is
generated.
This fault is sometimes caused by the
shorting of the electrode cable or by its
improper fixing to the connection points.
The electrode is connected to the earth
or badly worn and must be replaced. The
electronic board is faulty.
In the case of a sudden lack of voltage, the
burner will immediately switch off. When
voltage returns, the boiler will automatically
start up again.
3.8
WATER FLOW GUAGE
The water flow gauge (15 fig. 3) intervenes,
blocking burner functioning, if it detects
that there is insufficient water circulating in
Fig. 13
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