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flow temperature will follow the climatic
logic for zone 1, while it will be fixed at the
value set on the remote control for the
other zones. In the case of simultaneous
requests the boiler goes to the highest
temperature.
– Emergency. If the remote control should
break, the boiler however guarantees
temporary reduced functionality in the
domestic hot water and central heating
phase. The central heating request at
fixed temperature for zone 1 takes place
by the closure of a potential free contact
at the clamps reserved for the external
probe.
– Automatic regulation of the ignition
power and maximum central heating.
Adjustments are managed automatically
by the circuit board to guarantee maxi-
mum flexibility when using the system.
ATTENTION: To guarantee the correct
communication between some settings
made on the remote control and the boiler
action (e.g. summer/winter passage,
OFF), delays of up to 1/2 minutes have
been introduced.
3.2
TEMPERATURE
SENSORS
Anti-freeze system realised with active cen-
tral heating NTC probe when the tempera-
ture of the water reaches 10°C with the
intervention of the system pump. When the
temperature reaches 8°C the burner also
starts to function.
When the heating sensor (SM) is inter-
rupted, the boiler does not function in
both services and the "ALL 05" alarm
message is displayed by the remote con-
trol.
With the D.H.W. sensor (SS) interrupted,
74
the boiler works but does not perform
power modulation in the domestic hot
water phase. Moreover, involuntar y
system heating may occur and the remo-
te control display will show the "ALL 04 "
alarm message.
Table 4 give the resistance values (Ω) obtai-
ned on the sensors when the temperature
varies.
TABLE 4
Temperature (°C)
Resistance (Ω)
20
12.000
30
8.300
35
6.900
40
5.800
45
4.900
50
55
3.500
60
3.000
70
2.200
80
3.3
ELECTRONIC IGNITION
Ignition and flame detection is controlled by a
single electrode placed on the burner, which
guarantees maximum safety with interven-
tion times, for accidental cut-off or lack of
gas, of within one second.
3.3. 1
Function 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 inac-
tivity 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 produce the
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 ancho-
4. 1 00
red to the connection points.
Or the electrode may be earthed or
strongly worn: it must be replaced.
Or the electronic card may be defective.
1.700
In the case of a sudden lack of voltage, the
burner will switch off immediately; when vol-
tage returns, the boiler will automatically
start working again.
3.5
FUMES PRESSURE SWITCH
The fumes pressure switch is calibrated by
the manufacturer at the following values:
5,3 - 6,3 mm H
3,6 - 4,6 mm H
which will guarantee boiler function even with
discharge piping of the maximum length
allowed.
If the burner does not start up, check the
value of the pressure valve signal by means
of a special instrument linked to the pressu-
re tapping points (fig. 19).
0 in model "25 BF TS2"
2
0 in model "30 BF TS2",
2
Fig. 19
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