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3.3
EXTERNAL SENSOR
If there is an external sensor, the heating
settings SET can be taken from the climatic
curves (PAR 12) according to the external
temperature and, in any case, limited to
with the range values described in point 3.2
(parameters PAR 13 and PAR 14).
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. 14 will increase the output temperature
as the external temperature decreases.
3.5
CARD FUNCTIONING
The electronic card has the following
functions:
– Antifreeze protection of the heating cir-
cuits.
– 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 (10") after 48 hours of
inactivity.
– Chimney sweep function which can be
activated from the control panel.
– Temperature which can be shifted with
the external sensor connected.
– Automatic regulation of the ignition
power and maximum heating.
Adjustments are managed automati-
cally by the electronic card to guaran-
tee maximum flexibility in use of the
system.
– Interface with the following electronic
systems: remote control CR 73 or CR
63 combined with expansion card kit
code 8092240.
3.6
TEMPERATURE
DETECTION
SENSOR
Table 4 shows the resistance values of the
heating, D.H.W. and fumes sensor.
If the heating sensor (SM) and fumes sen-
sor (SF) is faulty or open circuit, the boi-
ler will not function on either heating or
D.H.W.
If the D.H.W. sensor (SB) is faulty or open
circuit, the boiler set in winter mode will
only work with heating function; if set in
summer mode, D.H.W. function will be
enabled only.
TABLE 4
Temperature (°C)
Resistance (Ω)
20
12.090
30
8.313
40
5.828
50
4. 1 61
60
3.021
70
2.229
80
1.669
ATTENTION: curves are calculated at an ambient temperature of 20°C.
Using the
key on the control panel, the user can change the set
ambient by ± 5°C for which the curve is calculated.
3.6
ELECTRONIC IGNITION
Ignition and flame detection is controlled
by a single electrode on the burner which
guarantees reaction in the case of acci-
dental extinction or lack of gas within one
second.
3.6. 1
Functioning cycle
Burner ignition occurs within max. 10
seconds after the opening of the gas
valve. Ignition failure with consequent acti-
vation of block can be due to:
– Lack of gas
The ignition electrode persists in
discharging for max. 10 seconds. If the
burner does not ignite, the anomaly is
signalled.
This can happen the first time the boi-
ler is switched on after a long period of
inactivity 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 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
electrode wire or if it is incorrectly
anchored to the connection points. Or
the electrode may be earthed or stron-
gly worn: it must be replaced. Or the
electronic card may be defective.
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.
3.7
WATRE PRESSURE SWITCH
The water pressure valve (C fig. 15/a)
intervenes, blocking burner functioning, if it
detects that there is insufficient pressure
in the boiler (< 0,6 bar).
To restore burner functioning, to bring back
the pressure of the boiler at values compri-
se between 1 - 1,2 bar.
3.8
HEAD AVAILABLE
TO SYSTEM
Residual head for the heating system is
shown as a function of rate of flow in the
graph in fig. 15.
To obtain the maximum head available to
the system, turn off the by-pass by turning
the union to the vertical position (fig. 15/a).
IT
ES
PT
ENG
Fig. 14
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