External Sensor - Sime Murelle EV HE 25/55 Manual De Instrucciones

3.4 EXTERNAL
SENSOR
If there is an external sensor, the heating
settings SET can be taken from the climatic
curves according to the external tempera-
ture and, in any case, limited to with the
range values described in point 3.3 (para-
meters PAR 25 for zone 1 and PAR 26 for
zone 2).
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 temperature
as the external temperature decreases.
3.5 CARD
FUNCTIONING
The electronic card has the following func-
tions:
– 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 inacti-
vity.
– Antifreeze protection for boilers with
D.H.W. storage tank.
– 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.
– Management of two independent heating
circuit systems.
– Automatic regulation of the ignition
power and maximum
Adjustments are managed automatically
by the electronic card to guarantee maxi-
mum flexibility in use of the system.
– Interface with the following electronic
systems: climatic regulator CR 53, remo-
te control CR 73, thermal regulator RVS
and connected to a management card of
a mixed zone ZONA MIX code 8092234.
NOTE: If using CR 53 or RVS set para-
meter 10 to 2 (PAR 10 = 2).
3.6 TEMPERATURE
DETECTION
SENSOR
Table 4 gives the values of the electrical
Ω
element ( ) obt ained on the heating,
D.H.W. and exhaust fumes sensors accor-
ding to the variations in temperature.
When the heating sensor (SM) and fumes
sensor (SF) is interrupted, the boiler will
not function for both services.
With D.H.W. sensor (SB) interrupted the
boiler, in modality "winter", works alone in
C.H., modality "summer" works alone in
D.H.W.
88
ATTENTION: curves are calculated at an ambient temperature of
20°C. The user can act on the boiler controls to change the envi-
ronment set for which the bend has been calculated by ±5°C.
TABLE 4
Temperature (°C)
20
30
40
50
heating.
60
70
80
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-
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 acti-
vation 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 anomaly is
signalled.
This can happen the first time the boi-
ler is switched on after a long period of
inactivity due to the presence of air in
the gas pipes
Resistance (Ω)
It can be caused by a closed gas tap or
12.090
by a broken valve coil (the interruption
8.313
does not allow for opening).
5.828
4. 1 61
– The electrode does not discharge.
3.021
In the boiler, only the opening of the gas
2.229
to the burner can be detected. After
1.669
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 stron-
gly worn: it must be replaced.
Or the electronic card may be defecti-
ve.
– No flame detected
After start-up the electrode continues
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 connection
points. The electrode is connected to
the earth or badly worn and must be
replaced. The electronic board is faulty.
In the case of a sudden lack of voltage, the
burner will immediately switch off. When
voltage returns, the boiler will automatically
start up again.
Fig. 13