20011755
20
GB
Operation
8.8.2
Block due to non-ignition
8.8.3
Block due to extraneous light during the pre-
purging
Key to lay-out
F
– Flame detector
I
– Ignition transformer
K
– Enabling switch thermostat for start up after preheating
LED
– Signal of operation status from reset button
MV
– Fan motor
PH
– Diesel oil heater
TL
– Limit thermostat
V1
– Oil valve
Operating times
The time is expressed in seconds
8.9
Fuel heating
In order to assure regular ignition and operation even at low tem-
peratures the burner has an oil heater fitted in combustion head.
The heater turns on when the thermostats close. T he enabling
signal for burner start up comes through a thermostat on the noz-
zle holder once the optimal ignition temperature is reached. The
heating remains on during operation and cuts out when the burn-
er shuts-down.
D7232
Signal not required
Yellow
Green
Red
Green+Yellow
Fig. 21
Yellow
Green
Red+Yellow
Block due to extraneous light during the preheating
Red
Block
Yellow
Yellow
D7231
Fig. 22
t1
max
1
ts
-
5
t1I
max
30
t4i
-
8
t2
-
3
t5i
-
3
t2I
max
30
t4I
max
1
t2p
max
600
t6
max
360
t3
-
15
t6I
max
30
t3I
max
1
t7
-
120
Red
Green + Yellow slow blinking
Green + Yellow fast blinking
Yellow
Green
Green + Yellow medium blinking
Red + Yellow fast blinking
Yellow fast blinking
