6195
8
GB
4.5
AIR PRESSURE SWITCH
4.6
ATOMISATION TEMPERATURE ADJUSTMENT
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 good 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 must be carried
out.
Minimum value contact thermostat
cuts in and stops the burner if the fuel temperature falls below the val-
ue necessary for a good combustion.
The maximum value contact thermostat
switches off the resistors when, if the adjustment thermostat fails,
the temperature increases inside the pre-heater. In case of abnormal temperature, make sure of the regular
functioning of the control thermostat and of the resistor in contact with the thermostat probe. The thermostat
is calibrated by the factory at 180 °C.
Carry out the regulation of the air pressure switch after car-
rying out all the other regulations of the burner with the air
pressure switch adjusted at the beginning of the scale.
With the burner operating at the MIN power increase the
pressure of the adjustment by slowly turning the appropri-
ate 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 cor-
rect turning on of the burner. If the burner locks out again
turn the knob a bit further in a counterclockwise direction.
D521
D2719
Thermostat
adjustment knob
Pre-heater
Purge
Atomisation temperature
Vis
c
osit
y
at
5
0
° C
sq.mm °E
D2694
