25
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 selec-
ted 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-jamming 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 hea-
ting circuit systems.
– Automatic regulation of the ignition
power and maximum heating.
Adjustments are managed automa-
tically by the electronic card to gua-
rantee maximum flexibility in use of
the system.
– Interface with the following electro-
nic systems: climatic regulator CR
53, remote control CR 73, thermal
regulator RVS, connected to a mana-
gement card of a mixed zone MIXED
ZONE code 8092234, card solar
INSOL code 8092235 and to board
RS-485 for managing up to 8 boilers
in cascade or implement a communi-
cation type Modbus (slave RTU-RS485,
Reference Guide PI-MBUS-300 Rev. J)
cod. 8092243.
NOTE: If using CR 53 set parameter
10 to 2 (PAR 10 = 2).
3.6
TEMPERATURE
DETECTION
SENSOR
Table 4
shows the resistance values of
the heating, and exhaust fumes thermi-
stors
.
If the heating flow sensor (SM), hea-
ting return sensor (SR) or the exhaust
fumes sensor (SF) is faulty or open cir-
cuit, the boiler will not function.
3.7 ELECTRONIC
IGNITION
Ignition and flame detection is con-
trolled by a electrodes on the burner
which guarantees reaction in the case
of accidental extinction or lack of gas
within one second.
TABLE 4 (SM - SR - SF sensors)
Temperature (°C)
Resistance (
Ω
)
20
12.090
30
8.313
40
5.828
50
4.161
60
3.021
70
2.229
80
1.669
3.7.1
Functioning cycle
Burner ignition occurs within max. 10
seconds after the opening of the gas
valve. If after three attempts to light,
the ignition is not detected, the boiler
will lockout. this can be due to:
–
Lack of gas
The ignition electrode will discharge
for max. 10 seconds. If the burner
does not ignite, the error ALL 06 is
signalled.
This can happen the first time the
boiler is switched on after a long
period of inactivity due to the pre-
sence of air in the gas pipes
It can be caused by a closed gas tap
or by a broken valve coil (the inter-
ruption does not allow for opening).
–
No Ionisation.
The boiler will make three attempts
to light. if after the third attempt the
flame has not been recognised, the
boiler will lockout ALL06. This may
be due to worn or distorted ionisa-
tion electrode.
In the case of a sudden loss of voltage,
the burner will immediately switch off.
When voltage returns, the boiler will
automatically start up again.
Fig. 13
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.
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