20
Fig. 16
Tab. 2
Cleaning/replacing the electrodes
To clean/replace the electrodes, proceed as follows:
1
remove the combustion head as described in the previous paragraph;
2
remove the electrodes ass.y and clean them;
3
in order to replace the electrodes, unscrew the fixing screws and remove them: place the new electrodes being careful to observe
the measures quoted in the previous paragraph; reassemble the electrodes and the combustion head following the procedure in
the reversed order.
Cleaning and replacing the detection photoresistor
To clean/replace the detection photoresistor, proceed as follows:
1
Disconnect the system from the electrical power supply.
2
Shut off the fuel supply
3
remove the photoresistor from its slot (see next figure);
4
clean it if dirty, with a dry and clean cloth;
5
if necessary, replace the photoresistor;
6
replace the photoresistor into its slot.
7
Checking the detection current
Before turning the burner on, or in case of maintenance, check the flame signal: while the burner is operating, measure by means of a
multimeter the voltage betwenn terminal 9 and the neutral. The voltage measured must be lower than 0.5Vdc, as shown on picture
below. This value assures a safety margin because it corresponds to a illumination twice the minimum required (the operating limit for
the device is 0.8V). If the measured value is higher, try to better set it or clean it if dirty.
NOZZLE
A
B
C
D
G6
60°
4
3
4
6
45°
8
4
4
6
G10 - G18
60°
6
4
4
6
45°
10
5
4
6
ATTENTION:
avoid
the electrodes to get in touch with metallic parts (blast tube, head, etc.), otherwise the boiler operation
would be compromised. Check the electrodes position after any intervention on the combustion head.
Morsetto n° 9
Morsetto di neutro
V
V< 0,5V DC
Terminal no.9
Neutral
