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7.7
Atomising temperature setting
7.7.1
Minimum - maximum temperature - setting
thermostat
The electronic setting thermostat, by means of a PT100 probe
immersed in the fuel oil delivery manifold, adjusts the atomising
temperature. (For a correct atomisation, see the temperature/
viscosity diagram Fig. 34).
Example: a fuel oil 7 °E at 50 °C must be pre-heated to about 110
°C.
NOTE:
The temperature set on the thermostat corresponds to the
fluid temperature, check in any case the correspondence
using the thermometer after a few minutes of operation. The
LED on indicates that heating elements are correctly
enabled.
The minimum temperature thermostat, besides stopping the
burner in the case that the fuel temperature drops below a critical
value, in order to ensure a good combustion, enables the burner
start-up phase. (It is factory set at about 80 °C and can be
adjusted by removing the pre-heater cover and the relevant
plate).
The maximum temperature thermostat disables heating
elements when, due to a fault of the setting thermostat, a
significant increase is detected in the pre-heater temperature;
any alarm (high temperature) is provided on the burner terminal
strip. (It is factory set at 180°C)
Replacing minimum and maximum temperature thermostats
Reposition the probes of the new thermostats after having
loosened the fastening screws of the plate pack, making sure that
the probe is in contact with the pipes and the heating element as
shown in the figure on the side. Use the same precautions for the
replacement of heating elements in contact with thermostat
probes. In case of malfunction, check the continuity of the heating
elements in contact with temperature probes using an ohmmeter
(value of approximately 35 Ohm).
Replacing PT100 probe in the delivery manifold
Insert nut and bicone connection (supplied as standard) in the
new heating element and insert it into the manifold connection by
approximately 40 mm, then tighten strongly. The external part
can be folded as required (without damaging the heating
element).
Atomising temperature °C
Start-up, calibration and operation of the burner
Pre-heater - Flow rate t
Fig. 33
Atomising temperature °C
Plate
D2048
Plate
31
GB
Setting thermostat probe
Thermometer
Min. temperature thermostat
Pre-heater
Max. temperature thermostat
Impurity drain
Plate pipes
Heating element
Thermostat
probe
D2005
Fig. 34
D2006
Fig. 35
D2007
Fig. 36
20170392
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