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USE OF THE BURNER
The burner operates fully automatically: it is activated by closing
the main switch and the control board switch.
Burner operations are controlled by commend and control devices,
as described in the chapter "Description of Operations". The "shut
down" position is a safety position automatically taken up by the
burner when a particular part of the burner or of the system is
inefficient. Therefore, it is good practice, before unblocking the
burner and starting it up again, to check that there are no defects
in the heating plant. The length of time that the burner rests in the
"shut down" position is without limit. To unblock the control box,
press the appropriate pushbutton. "Shut down" can be caused by
transitory flows (a little water in the fuel, air in the pipes, etc.); in
these cases, if unblocked, the burner will start up normally. When,
however, shutdowns occur repeatedly (3 or 4 times), do not persist
in trying to unblock the burner, first check that there is fuel in the
tank and then call the local service to repair the defect.
MAINTENANCE
The burner does not require special maintenance, but it is good
practice to perform the following operations at the end of the heating
season.
1) Remove and wash thoroughly with solvents (petrol, trichlo-
roethylene, oil) the filters, the nozzle, the turbulator disk and
the ignition electrodes. Avoid cleaning the nozzle with metal
instruments (use wood or plastic).
2) Clean the photoresistant cell.
3) Have the boiler cleaned and, if necessary, also the chimney,
by specialized personnel (stove fitter); a clean boiler is more
efficient, lasts longer and is more silent.
VARIANTS FOR BURNERS PROVIDED WITH STEAM
PRE-HEATER TO HEAT THE FUEL OIL
The burner can be provided with a pre-heater of the fuel oil which
operates with steam; the fuel will be heated by steam and there will
be a consequent saving in electricity. This device consists of a small
tank in which steam circulates and inside the tank is a coil in which
the fuel oil to be heated circulates. This particular device permits
a notable reduction in the dimension of the pre-heater. When the
burner starts up, cold fuel oil would be forced to pass through the
coil of the steam pre-heater still cold because it would not yet have
been heated by the steam. The high viscosity of the fuel (cold), the
notable development (length) of the coil its relatively small diame-
Steam Pressure at manometer
Approximate corresponding
Temperature
bar
1
1,5
2
2,5
°C
120
127
133
138
17 / 28
0006081143_201107
ter (necessary in order to obtain a high thermal exchange), would
determine a strong pressure loss and consequently the fuel would
reach the nozzle at insufficient pressure. To avoid this situation,
the steam pre-heater has been provided with a manual-controlled
by-pass which prevents, when open, the fuel passing through the
coil (see BT 8576).
Installation
The user should provide and install on the pipeline that ta-
kes the steam to the fuel
valve, a suitable pressure reducer (adjustable from 1 to 8
bar) and a control manometer (end of the scale 10 bar).
Do not recuperate the condensate which is discharged from the
heater to avoid, in case there is a leak in the coil, fuel oil going into
the steam system.
Regulation
When the boiler has reached sufficient pressure, open the gate
valve which allows the steam inflow to reach the oil pre-heater, and
open slightly the "air discharge" gate valve fitted on the condensate
outlet pipeline.
While the steam is discharging from the gate valve slightly opened,
regulate the pressure reducer at a sufficient value in order to heat
the fuel oil to a temperature a little above (about 10 ÷ 15° C) that
at which the regulation thermostat of the electric heater has been
set. An orientative regulation can be carried out by operating the
pressure reducer in function with the value indicated by the mano-
meter; if necessary, correct the regulation after having controlled
the temperature of the fuel coming out of the steam heater. When
regulation has been carried out, close the air discharge gate valve.
The thermostats (minimum and regulation) of the electric pre-heater
should be regulate normally as described in Chapter "Start up and
Regulation".
3
3,5
4
4,5
143
147
151
155
heater the following: a gate
5
6
7
8
158
164
169
174
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