Air Pressure Switch; Atomisation Temperature Adjustment - Riello PRESS 45 N/ECO Manuel D'entretien

4.5

AIR PRESSURE SWITCH

D521
4.6

ATOMISATION TEMPERATURE ADJUSTMENT

Thermostat for adjustment - maximum value - minimum value
Adjustment thermostat prevents burner start up if the fuel temperature has not reached the required value for
a better atomisation as indicated in the diagram below.
sq. mm/sec °E
D2640
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 operation 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 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.
6193
Carry out the regulation of the air pressure switch after
carrying out all the other regulations of the burner with
the air pressure switch adjusted to 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 turning on of the burner. If the burner locks
out again turn the knob a bit further in a counterclock-
wise direction.
°C
Atomisation temperature
7
GB
Thermostat
adjustment knob
Pre-heater
Purge
D2719