2902936
14
GB
4.7 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 light 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 temperature does not require it,
etc. . .), take the plug off the panel of the control box and plug it
into the “Resistance OFF” (see fig. 21).
In this case the burner starts up when the thermostats close.
NOTE
The warning light (LED) is ON but when the resistance works. It
is OFF when the resistance is disconnected or broken.
4.8 FAILURE DETECTION ON HEATING DEVICE
■
NORMAL OPERATION
The plug fitted in the panel is placed in the position corresponding
to “Resistance ON”
(see fig. 20).
When the remote control closes, the LED lights up and, after about
two minutes, the burner starts up.
■
BURNER DOES NOT OPERATE
1)
If the LED is OFF, the heating resistance placed in the noz-
zle-holder is off.
2)
If the LED is ON and nevertheless the burner does not run,
place the plug in the position corresponding to “Resistance
OFF”
(see fig. 21).
If the motor runs, the delaying device inside the control box
is out of order.
3)
If the motor does not run, it means that the failure is neither
in the panel nor in the resistance, but elsewhere.
4.9 BURNER START-UP CYCLE
S7060
Plug
LED
S7059
Fig. 21
Resistance ON
Resistance OFF
Plug
LED
Resistance OFF
Fig. 20
Normal
Lock-out, due to failure to light
Thermostat
Resistance
Motor
Ignition transformer
Valve
Flame
~
120 s
D5329
~
120s
~
12s
Lock-out lamp
~
12s
~
5 s