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STARTING UP AND REGULATION WITH FUEL OIL
1) Check that the characteristics of the nozzle (delivery and spray
angle) are suitable for the furnace (see BT 9353/1). If not,
replace it.
2) Check that there is fuel in the cistern and that it is, at least
visually, suitable for the burner.
3) Check that there is water in the boiler and that the system's
gate valves are open.
4) Check, with absolute certainty, that the discharge of combustion
products can take place freely (boiler and chimney lock-gates
should be open).
5) Make sure that the voltage of the electric line to which the burner
is to be connected, corresponds to that required by the burner,
and that the motor's electrical connections and resistances have
been correctly prepared to match the voltage rating available.
Also check that all the electrical connections carried out on the
spot are in accordance with our electric wiring diagram.
6) Make sure that the combustion head enters the furnace to the
extent specified by the boiler manufacturer. Check that the
air regulation device on the combustion head is in the position
considered necessary for the fuel delivery required (the air
passage between the disk and the head should be considerably
closed when the fuel delivery is relatively reduced; on the other
hand, when the nozzle has a fairly high delivery, the air passage
between the disk and the head should be relatively open (see
Chapter "Regulation of the Combustion Head").
7) Remove the protective cover from the rotating disk inserted on
the modulation motor. On this disk have been fitted adjustable
screws which are used to control the fuel and the relative
combustion air.
8) Put the two modulating switches in the "MIN" (minimum) and
"MAN" (manual) positions.
9) Check that the minimum and regulation thermostats of the
pre-heater have been correctly regulated for the type of fuel
to be used. By knowing the nominal viscosity value of the fuel
intended for use and by referring to the Viscosity-Temperature
Diagram, it is possible to find the exact pre-heating temperature
necessary for the fuel oil. It should be kept in mind that the fuel
should arrive at the nozzle with a viscosity rate not exceeding
2° E. To avoid interferences which would bring the burner to
a standstill, it is necessary to set the regulation thermostat at
a temperature 15 ÷ 20 °C higher with respect to the minimum
thermostat. After starting up the burner check that the thermo-
stats operate correctly by controlling the thermometer on the
pre-heater. Regulate at about 50° C the control thermostat of
the resistance which is incorporated in the line filter.
10) Start up the fuel supply auxiliary circuit, check its efficiency and
regulate the pressure at about 1 bar.
11) Remove from the pump the vacuumeter connection point plug
and then open slightly the gate valve fitted on the fuel arrival
pipe. Wait until fuel comes out of the hole, without air bubbles,
and then re-close the gate valve.
12) Insert a manometer (end of the scale about 3 bar) into
the vacuumeter connection point on the pump and con-
trol the value of the pressure at which the fuel arrives at
the burner pump. Insert a manometer (end of the scale
about 30 bar) into the manometer connection point pro-
vided on the pump and control its working pressure.
Insert a manometer (end of the scale about 30 bar) into the
special connection point of the return pressure regulator in
order to control the value which determines delivery (see BT
8712/2).
13) Now open all the gate valves and any other interception devices
fitted on the fuel pipelines.
14) Put the switch on the control panel in the "O" (open) position to
avoid the resistances being inserted with an empty tank, and
give current to the electric lines which the burner is connected
to. Check, by pressing manually the relative relay, that the fan
and pump motors rotate in the right direction. If they do not,
exchange the places of two cables of the principle line in order
to inverse the sense of rotation.
15) Start operating the burner pump by pressing manually on
the relative relay until the manometer, which measures the
working pressure of the pump, indicates a slight pressure. The
presence of low pressure in the circuit confirms that filling up
of the pre-heater tank has taken place.
16) Connect the switch on the control panel to give current to the
control box. In this way, and on the command of the relative
thermostat, the resistances which heat the fuel in the tank and
that which heats the line filter will be inserted. At the same
time (but only for models ...D) the resistances for heating the
atomizer group and the pump are inserted. The pilot light on
the control panel will indicate when the resistances have been
inserted.
17) The minimum thermostat closes when the fuel contained in the
pre-heater reaches the temperature at which the thermostat
has been set. When the minimum thermostat closes it does
not immediately determine connection of the burner's control
box. The control box is connected by the regulation thermo-
stat (change over contact) when it disinserts the resistances
because the fuel temperature has reached the value at which
the regulation thermostat has been set. Therefore, the burner
starts up, provided that the boiler and safety thermostats or
pressure switches are closed, only when the resistances have
been disinserted and maximum temperature in the pre-heater
has been reached. When the burner is operating, an auxiliary
relay (connected to the minimum thermostat) will prevent it from
coming to a standstill when the regulation thermostat changes
over the contact in order to insert the resistances again (see
electric diagram). When the control box is connected, the bur-
ner will begin to carry out the ignition phases. The programme
provides a pre-ventilation phase of the combustion chamber
at the same time as a pre-circulation phase of the entire fuel
circuit of the burner (with hot oil at low pressure). Burner ignition
occurs as described in the previous chapter "Description of
Operations" and the burner starts up at minimum.
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