15
20132157
GB
Start-up, calibration and operation of the burner
6.4
Adjustment of the air damper motor
STOP - Blue lever
This lever leaves the factory vertically positioned and
corresponds to the complete closing of the air damper. A partial
opening of the air damper might be obtained by moving leftwards
this lever (+ on the label).
The new position of the air damper is detectable when the burner
is off. Do not overcome the position of the orange lever for the 1st
stage.
1st STAGE - Orange lever
The orange lever controls the air damper position for the first
flame, it is adjustable both for opening and closing.
2nd STAGE - Red and black levers
The red lever controls the air damper position for the second
flame, it is adjustable both for closing and opening.
The black lever controls the opening of the second oil valve and
it must always anticipate - for a bit - the red lever, but never the
orange one.
6.5
Spray temperature adjustmen
Thermostat for adjustment - maximum value - minimum
value
Adjustment thermostat
prevents the burner start up if the fuel
temperature has not reached the required value for a good spray
as indicated in the diagram below.
Example
Fuel oil with viscosity of 7 °E at 50 °C is pre-heated to
approximately 110 °C.
The thermostat has to be generally set at a value higher than the
required one (120°C indicated on the knob to get approximately
100°C at the nozzles).
The value read has to be done after some minutes of
performance and later the necessary adjustments could be
carried out.
Minimum value contact thermostat
intervenes by stopping the
burner if the fuel temperature decreases under the value
necessary for a good combustion.
Maximum value contact thermostat
switches off the
resistances when in case of failure of the adjustment thermostat,
the temperature increases inside the pre-heater. In case of
abnormal temperature, make sure of the regular functioning of
control thermostat and of the resistance in contact with the probe
of the thermostat.
NOTICE
If the pre-heater thermostat or the resistance contacting the
probe should be replaced, the probe has to be positioned in
contact with the resistance and with the pipes of the last
aluminium plate, after loosening of the fixing screws of the
aluminium plate, see drawing.
If during the operation exceptional changes or too much high
temperatures should be detected, verify the continuity of the
resistance, using and ohmmeter, contacting the temperature
probe (approximately 35 Ohm).
Use only filters marked with a recognizable printing on the
screwing hexagon.
Fig. 13
D2638
Black lever
Red lever
Orange lever
Blue lever
Opening
+
–
Closing
Fig. 14
D2640
D2641
Sheath for thermometer
Adjusting knob
of thermostat
Pre-heater
Purge
Spray temperature
Vis
c
os
it
y at
50°
C
mm
2
/s °E
°C
