Riello PRESS 100 N Installation, Use And Maintenance Instructions page 18

4.5 SPRAY 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 a good spray as indicated in the diagram below.
2
mm /s °E
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. 
The thermostat is calibrated by the factory at 180 °C.
NOTICE
Pre-heater thermostats
Replace the probe of the new thermostat, after the
loosening of the fixing screws of the plates pack, taking
care of good contact between the probe and the tubes
and the resistance, see
ance substitution.
If during the operation exceptional changes or too
much high temperatures should be detected, verify the
continuity of the resistance, using and ohmmeter, con-
tacting the temperature probe (approximately 35 Ohm).
Use only filters marked with a recognizable printing on
the screwing hexagon.
2915830
Spray temperature
substitution.
drawing. Similarly for resist-
D2694
Sheath for thermometer
Adjusting knob
of thermostat
Pre-heater
Purge
Aluminium
plate
D2751
7
GB
D2641
Tubes into aluminium plate
Resistance
Thermostat probe