2323
8
GB
4.2 ELECTRODES ADJUSTMENT
(see fig. 15)
4.3 FLAME DETECTOR ADJUSTMENT
(See fig. 16)
The sensitivity of the flame detector can be adjusted with a
potentiometer (3). It is factory-set t in position 4.
Led (1) indicates the sensitivity.
Led (2) indicates the operation.
■
During pre-ventilation both leds are switched off.
■
Optimal sensitivity during stable operation is shown when
both leds are switched on.
➤
If led (1) pulsates, turn the potentiometer until it switches on
in a steady manner. Then, first turn the pointer
counterclockwise until the led pulsates.
Next, increase the sensitivity by turning the pointer
clockwise one or two notches.
➤
Wait at least 5 minutes, then make sure that the
adjustment done as above allows a correct starting
program of the burner.
4.4 FUEL HEATING
In order to assure regular ignition and working also at low temperature the burner has an oil pre-heater
fitted in combustion head. The pre-heater starts when thermostats close.
When the required temperature for ignition is reached the thermostat fitted on the nozzle holder starts the
burner. The pre-heater remains energised during working and cuts out when burner shuts-down.
D5843
Fig. 15
5
4
3
1
4.5
– 0,5 mm
0
4
0 mm
+
0.5
5.5 ±
0.3 mm
MEASURES MUST BE RESPECTED.
Lean the diffuser disc-holder assembly
(1) on the nozzle-holder (2) and lock it
by screw (3).
For prospective adjustments of the elec-
trodes assembly (4), loosen screw (5).
To have access to the electrodes carry
out operation as described in chapter
4.1 (page 6) “RECOMMENDED NOZ-
ZLES”.
WARNING
2
3
2
1
Fig. 16
S7129