6192
7
GB
4.5
AIR PRESSURE SWITCH
4.6
ATOMISATION TEMPERATURE ADJUSTMENT
Control thermostat - minimum value - maximum value
Adjustment thermostat
prevents the burner start up if the fuel temperature has not reached the value required
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 carried out.
Minimum value contact thermostat
intervenes by stopping the burner if the fuel temperature falls below
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 cut ins ,check the control
thermostat the resistor in contact with the said thermostat probe are operation properly.
D2640
D2719
Thermostat adjustment
knob
Pre-heater
Purge
Atomisation temperature
Visco
sity
a
t 50
° C
sq. mm/sec °E
°C
Carry out the regulation of the air pressure switch after
carrying out all the other regulations of the burner with
the air pressure switch regulated at the beginning of
the scale.
With the burner operating at the 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 start up of the burner. If the burner locks out
again turn the knob a bit further in a counterclockwise
direction.
D68
D 521
