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curves according to the external tempera-
ture and, in any case, limited to with the
range values described in point 3 .2 (para-
meters 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 . 15 will increase the output temperature
as the external temperature decreases .
3 .5
CARD FUNCTIONING
The electronic card has the following fun-
ctions:
– Antifreeze protection of the heating cir-
cuit .
– 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 48 hours of inactivi-
ty .
– Chimney sweep function which can be
activated from the control panel .
– Temperature which can be shifted with
the external sensor connected .
It can be set from the control panel .
– Automatic regulation of the igni-
tion 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 o CR 63,
with coupling kit card expansion code
8092240 .
3 .6
TEMPERATURE
DETECTION SENSOR
Table 3 gives the values of the electrical
element (
) obtained on the heating and
Ω
sanitary water sensors according to the
variations in temperature .
The C .H . sensor (SM1/SM2) is of type to dou-
ble sensing element with function safety
thermostat .
When the heating sensor (SM1/SM2) is
interrupted, the boiler will not function for
both services .
With the D .H .W . sensor (SS) interrupted, the
boiler functions only in modality D .H .W .
3 .7
ELECTRONIC IGNITION
Ignition and flame detection is controlled
by a single electrode on the burner which
guarantees reaction in the case of acci-
TABLE 3
Temperature (°C)
Resistance (Ω)
20
12 .090
30
40
50
60
70
84
ATTENTION: curves are calculated at an ambient temperature of 20°C .
dental 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
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
strongly worn: it must be replaced .
Or the electronic card may be defective .
8 .313
In the case of a sudden lack of voltage, the
5 .828
burner will immediately switch off . When
4 .161
voltage returns, the boiler will automatical-
3 .021
ly start up again .
2 .229
2
1
3
4
Using the key on the control panel, the user can
change the set ambient by ± 5°C for which the
3 .8
This is a safety measure against the return
of the fumes into the environment due to
an inefficient or partially blocked chimney
(7 fig . 3) .
It reacts by blocking the functioning of the
gas valve when the fumes are continually
forced back into the environment, in a
quantity that can be dangerous . If the boi-
ler repeatedly stops, it will be necessary to
carefully check the chimney, and to carry
out all modifications and take all measures
necessary to restore it to an efficient wor-
king state . After every intervention carried
outon the device, check correct functio-
ning . In the case of replacement, use only
original spare parts .
3 .9
The pressure switch is calibrated by the
manufacturer at the following values:
0 .62 - 0 .72 H
0 .45 - 0 .55 H
which can guarantee boiler functioning
also with aspiration and discharge pipes of
the maximum length allowed .
The value of the signal to the pressure swi-
tch is measured by a differential pressure
gauge connected as indicated in fig . 16 .
Fig . 15
FUMES THERMOSTAT
"25 OF"
FUMES PRESSURE SWITCH
"25-30 BF" (fig . 16)
O for vers . "25 BF"
2
O for vers . "30 BF",
2
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