27
DRAFT
Confi
dential
SIME
Not f
or dis
tribution to other
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 and PAR 25 for zone 2 and PAR28 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.
– Flow temperature control which can
be shifted with the external probe
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 probe (SM), heating
return probe (SR) or the exhaust fumes
sensor (SF) are faulty or open circuit,
the boiler will not function.
TABLE 4 (SM - SS - SF sensor)
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 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.
3.7.1 Functioning
cycle
Burner ignition occurs within max 10
seconds after opening of the gas valve.
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 ALL06 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
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.
