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STARTING UP AND REGULATION WITH LIGHT
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
manufacturer, and that the motors electrical connections 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 is long enough to enter
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 requi-
red (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 in-
serted on the servomotor regulating delivery (fuel/air).
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) position.
9) Start up the fuel supply auxiliary circuit, check its efficiency and
regulate the pressure at about 1 bar (if the circuit is supplied
with a pressure regulator).
10) Remove from the pump the vacuumeter connection point plug
and then open slightly
the gate valve fitted on the fuel arrival
pipe. Wait until the fuel comes out of the hole, without air bub-
bles, and then re-close the gate valve.
11) Insert a manometer (end of the scale about 3 bar) into the
vacuumeter connection point on the pump and control the
value of the pressure at which the fuel arrives at the burner
pump. insert a manometer (end of the scale 30 bar) into the
manometer connection point provided 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 first flame return
pressure regulator (see BT 8714/2) in order to control the return
pressure.
12) Now open all the gate valves and any other interception devices
fitted on the light oil pipelines.
13) Put the switch on the control panel in the “O” (open) position 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.
14) 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 has taken
place.
15) Insert the switch on the control panel to give current to the
control box. If the thermostats (safety and boiler) are closed,
the control box’s programmer will be connected and will insert
the burner’s component devices according to its pre-established
programme. The unit starts up in this way, as described in
Chapter “Description of Operations”.
16) When the burner is operating at “minimum”, proceed with regula-
ting the air to the quantity considered necessary to ensure good
combustion. Tighten more or loosen more the adjusting screws
in correspondence to the point of contact, with the lever which
transmits the movement to the combustion air regulation shutter.
It is preferable that the quantity of air for the “minimum” is
slightly reduced, in order to ensure a soft ignition even in the
most critical conditions.
17) After having regulated the air for the “minimum”, put the modu-
lation switches in the “MAN” (manual) and “MAX” (maximum)
positions.
18) The servomotor which regulates the fuel/air delivery starts
moving; wait until the disk on which the regulating screws have
been fitted, has reached an angle of about 12° (this corresponds
to a space taken up by three screws), stop the modulation and
return the switch to the “O” position. Carry out a visual control
of the flame and proceed, if necessary, with regulating the
combustion air by operating as described in point 16.
Subsequently, control combustion with the appropriate in-
struments and modify, if necessary, the previous regulation
carried out by visual control only. The operation described
above should be repeated progressively (by moving forwards
the disk by about 12° at a time) and modifying every time, if
necessary, the fuel/air ratio during the entire modulation run.
Make sure that the increase in fuel delivery occurs gradually
and that maximum delivery is reached at the end of the
modulation run. This is necessary in order to ensure that
modulation functions with good graduality. The positions of
the screws that commend the fuel may need to be modified
in order to obtain the graduality required. Maximum delivery
is obtained when the return pressure is about 2 ÷ 3 bar less
than the delivery pressure (normally 20 ÷ 22 bar). For a correct
air/fuel ratio, the percentage of Carbon Dioxide (CO
2
) should
increase with the increase in delivery (at least 10% at minimum
delivery to a maximum of 13% at maximum delivery).
We advise against exceeding 13% of CO
2
to avoid operating
with a rather limited excess of air which could cause a conside-
rable increase in smoke opacity due to unavoidable circumstan-
ces (a variation in the atmospheric pressure, presence of dust
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