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3.4
EXTERNAL SENSOR
(fig. 13)
If there is an external sensor, the hea-
ting settings SET can be taken from the
climatic curves according to the external
temperature and, in any case, limited to
with the range values described in point
3.3 (parameters PAR 22 for zone 1, PAR
25 for zone 2 and PAR 28 for zone 3).
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 tem-
perature as the external temperature
decreases.
3.5
CARD FUNCTIONING
The electronic card has the following
functions:
– 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
activated 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 circuit 2 and 3.
– Management of 3 independent heating
circuit systems.
– 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 elec-
tronic
systems:
remote
SIME HOME code
8092281,
mal regulator RVS, connected to a
management card of a mixed zone
ZONA MIX code 8092275/76, card
SOLAR code 8092277 and to board
MODBUS code 8092278.
NOTE: If using RVS 43 set parameter
10 to 3 (PAR 10 = 3).
3.6
TEMPERATURE
DETECTION
SENSOR
Table 4 shows the resistance values of
the heating, DHW and exhaust fumes
thermistors.
If the C.H. flow sensor (SM), C.H. return
sensor (SR) and the exhaust fumes sen-
sor (SF) is faulty or open circuit, the
60
ATTENTION: curves are calculated at an ambient temperatu-
re of 20°C. The user can act on the boiler controls to change
the environment set for which the bend has been calculated
by ±5°C.
boiler will not function.
TABLE 4 (SM - SR - SF sensors)
Temperature (°C)
20
30
40
50
60
70
control
80
ther-
3.7
ELECTRONIC IGNITION
Ignition and flame detection is control-
led by a single electrode on the burner
which guarantees 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
discharging for max. 10 seconds. If
the burner does not ignite, the ano-
maly is signalled.
This can happen the first time the
boiler is switched on after a long
Resistance (Ω)
period of inactivity due to the pre-
12.090
sence of air in the gas pipes
8.313
It can be caused by a closed gas tap
5.828
or by a broken valve coil (the inter-
4.161
ruption does not allow for opening).
3.021
2.229
– The electrode does not discharge.
1.669
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 defec-
tive.
– No flame detected
After start-up the electrode conti-
nues 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 con-
Fig. 13
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