PART IV: MAINTENANCE
35
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;
in order to replace the electrodes, unscrew the
VE
fixing screws and remove them: place the new
electrodes being careful to observe the measures in the previous paragraph; reassemble the electro-
des and the combustion head following the reversed procedure.
Cleaning and replacing the detection photocell
To clean/replace the detection photocell, proceed as follows:
1
Disconnect the system from the electrical power supply.
2
Shut off the fuel supply;
3
remove the photocell from its slot (see next figure);
4
clean the bulbe if dirty, taking care not to touch it with bare hands;
5
if necessary, replace the bulb;
6
replace the photocell into its slot.
Checking the detection current
To check the detection signal follow the scheme in the picture below. If the signal is less than the value indicated, check the position of
the detection electrode or detector, the electrical contacts and, if necessary, replace the electrode or the detector.
Seasonal stop
To stop the burner in the seasonal stop, proceed as follows:
1
turn the burner main switch to 0 (Off position)
2
disconnect the power mains
3
close the fuel valve of the supply line
Burner disposal
In case of disposal, follow the instructions according to the laws in force in your country about the “Disposal of materials”.
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.
VE
Control box
Flame sen-
sor
Minimum detec-
tion signal
LMO44
QRB4
45
μ
A
LAL2..
QRB1
95
μ
A
34 35
MC TERMINAL BLOCK
+
(BK)
-
(BU)
