1544
9
GB
FUEL HEATING
In order to obtain smooth starting and operation across its output range the burner is fitted with an
electric resistance, which heats up the gas oil in the nozzle line.
This resistance is energized when the thermostat calls for heat and after a delay of approximately two
minutes depending on room temperature, the motor will start.
The resistance remains inserted and locks-out on the shut-down of the burner.
ATTENTION
Should you want to cut off the electric resistance
(on setting the burner or when the ambient tem-
perature does not require it,
etc. . .), take the
plug off the panel of the control box and plug it in-
to the “Resistance OFF”.
In this case the burner starts up when the ther-
mostats close.
NOTE
The warning light
(LED)
is ON but when the re-
sistance works
It is OFF when the resistance is disconnected or
broken.
LOCATION OF DIFFUSER DISC-ELECTRODES
CONTROL BOX 531SE
*
PLUG
Resistance ON
Resistance OFF
LED
S7059
ATTENTION:
Before removing or mounting
the nozzle, unloose the screw
(A) and then take off the support
of diffuser disc and the elec-
trodes.
By means of the screw (B) the
electrodes can be restored to
their correct position in case
there had been any tampering.
IMPORTANT:
THESE DIMENSIONS
MUST BE OBSERVED
4
±
0.3 mm
D5588
B
5.5
±
0.3 mm
A
2 – 2.5
mm
Hole for light
of photoresistance
