IT
ES
PT
GB
110
–
“Modureg Sel.” connector
(14 fig. 17)
With the bridge disconnected the boiler
is predisposed to function with the SIT
gas valve, and with the bridge connected
it is predisposed to function with the
HONEYWELL gas valve.
–
“Albatros” connector
(15 fig. 17)
The bridge must always be disconnected.
It is connected only when multiple boilers
are installed in a sequence/cascade.
ATTENTION: It is essential that the opera-
tions described above be carried out by
authorized technical staff.
3.2
TEMPERATURE SENSOR
AND WATER PRESSURE
TRANSDUCER
Tables 3 - 3/a
show the resistance values
(
Ω
) that are obtained on the sensor as the
temperature varies and the transducer
values obtained as the pressure varies.
W h e n s e n s o r ( S M ) i s i n t e r r u p t e d ,
neither of the boiler's heating services
will function. With D.H.W. sensor (SB)
interrupted, the boiler will only work in
heating mode.
3.3
ELECTRONIC IGNITION
Ignition and flame detection is controlled by
two electrodes located on the burner.
These guarantee maximum safety with
intervention times, for accidental switching
off or gas failure, of within one second.
3.3.1
Operating cycle
Rotate the selector knob to summer or win-
ter, and verify that green led (
) lights up to
confirm the presence of voltage.
The burner must be ignited within 10
seconds. However, it is possible for ignition
failures to occur, with consequent activa-
tion of signal indicating that the control box
has “locked out”.
–
Gas failure
The control box runs through the cycle
normally sending electric power to the
ignition electrode. The electrode conti-
nues spark discharge for a maximum of
10 sec.If the burner does not light, the
lock-out indicator will light up.
This may occur upon first ignition or
after long periods of boiler lay-off when
there is air in the pipes. It may be caused
by the gas cock being closed or by one of
the valve coils having a break in the win-
ding, so that the valve cannot open.
–
Ignition electrode fails to spark
In the boiler, only the gas to the burner
is seen to open. After 10 sec. the war-
ning light indicating equipment “lock-
out” lights up.
This may be due to a break in the wire of
the electrode or to the wire not properly
fastened to the electric terminal of the
control box;
–
No detection of flame
The continuous spark discharge of the
electrode is noted starting from ignition
even though the burner is lit.
A f t e r 10 s e c o n d s h a v e e l a p s e d , t h e
sparks cease, the burner goes out, and
the warning light indicating equipment
“lock-out” lights up.
There could have a break in the wire of
the sensing electrode or the electrode
itself is touching earth: the electrode is
worn out and needs replacing. The con-
trol box is defective.
When there is a sudden voltage failure, the
burner shuts out immediately; when power
supply returns, the boiler will start up again
automatically.
3.4
FLOW SWITCH SAFETY VALVE
A flow switch safety valve (17 fig. 3) interve-
nes, blocking the operation of the burner if
the boiler is without water due to the for-
mation of an air lock in the heat exchanger
or if the circulator is not working, or, model
“30/80”
, because the “Aqua Guard Filter
System” is obstructed with impurities.
NOTE: If replacing the flow switch valve,
make sure that the arrow stamped on the
valve points in the same direction as the
flow of water.
3.5
SYSTEM AVAILABLE HEAD
For boilers with the standard fittings, the
residual head for the heating system on
the basis of rate of flow is represented in
the diagram in figure 18.
TABLE 3 (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
TABLE 3/a (Transducer)
Pressure
Resistance (
Ω
)
(bar)
min
max
0
297
320
0,5
260
269
1
222
228
1,5
195
200
2
167
173
2,5
137
143
3
108
113
3,5
90
94
0
600
200
1600
1400
1200
1000
800
600
400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
vers. 30/80
vers. 30/130
Dewy
Fig. 18
1 HIGH TEMPERATURE ZONE
FLOW RATE (l/h)
RESIDU
AL
HEAD
(mbar)
Содержание DEWY 30/130
Страница 33: ......
