6194
7
GB
4.5
AIR PRESSURE SWITCH
4.6
ATOMISATION TEMPERATURE ADJUSTMENT
Adjustment thermostat - maximum value - minimum value
Adjustment thermostat
prevents the burner start up if the fuel temperature has not reached the required value
for a better atomisation 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 has to be read after some minutes of operation and later the necessary adjustments might be carried
out.
Minimum value contact thermostat
intervenes by stopping the burner if the fuel temperature decreases
under the value necessary for better combustion.
Maximum value contact thermostat
switches off the resistors 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 resistor in contact with the probe of the thermostat.
The thermostat is calibrated by the factory at 180 °C.
D2719
Adjusting knob
of thermostat
Pre-heater
Purge
Atomisation temperature
Visco
sity
a
t 50
° C
sq.mm/s °E
D2694
D521
Regulate the air pressure switch after carrying out all
the other regulations of the burner with the air pres-
sure switch adjusted at the beginning of the scale.
With the burner operating at MIN power, increase the
pressure of the adjustment by slowly turning the
appropriate knob clockwise until the burner locks out.
Then turn the knob counterclockwise to a value equal
to about 20% of the regulated value and then check
the correct burner start up. If the burner locks out
again turn the knob a bit further in a counterclockwise
direction.
