baltur BT 75 DSPG Manual De Mantenimiento, Uso E Instalación página 16

STARTING UP AND REGULATION WITH LIGHT OIL
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1) Check that the characteristics of the nozzle (delivery and
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spray angle) are suitable for the furnace (see BT 9353/1).
If not, replace it.
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2) Check that there is fuel in the cistern and that it is, at least
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visually; suitable for the burner.
3) Check that there is water in the boiler and that the system's gate
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valves are open.
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4) Check, with absolute certainty, that the discharge of combustion
products can take place freely (boiler and chimney lock-gates
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should be open).
5) Make sure that the voltage of the electric line to which the bur-
ner is to be connected, corresponds to that requested by the
manufacturer, and that the motor's electrical connections have
been correctly prepared to match the voltage rating available.
Also 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
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 (see chapter "Regulation of the
combustion head").
7) Remove the protective cover from the rotating disk in-
serted on the modulating 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) 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 fuel comes out of the hole, without air bubbles,
and then re-close the gate valve.
11) Insert a manometer (end of the scale about 3 bar) into the vacuu-
meter connection point on the pump and control the value of the
pressure at which the fuel arrives at the burner pump. Insert a
manometer (and of the scale about 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.
12) Now open all the gate valves and any other fuel interception
devices fitted on the fuel pipelines.
13) Put the switch on the control panel in the "0" (open) position and
give current to the electric lines which the burner is connected
to. Check, by pressing manually on the relative relay, that the
motor rotates in the right direction. If it does not, exchange the
places of two cables of the principle line in order to invert 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-established programme.The
unit starts up in this way, as described in chapter "Description
of Operations".
16) When the burner is operating at "minimum", pro-
ceed with regulating the air to the quantity considered
necessary to ensure efficient combustion. Tighten or loosen the
adjusting screws situated on the point of contact on 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 modulation motor starts moving; wait until the disk on which
the regulating screws have been fitted, has reached an angle
of about 12° (this corresponds to the space taken up by three
screws), stop the modulation motor and return the switch to the
"0" 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 instruments and modify, if necessary, the
previous regulation carried out after a visual control only. The
operation described above should be repeated progressively
(by moving forwards the disk by about 12° at a time) and modi-
fying every time, if necessary; the fuel/air ratio during the entire
modulating 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 position 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
Fuel/air ratio, the percentage of Carbon Dioxide (CO
increase with the increase delivery (from a minimum of 10% at
minimum delivery to a maximum of 13% at maximum delivery).
We advise against exceeding 13% of CO
a rather limited excess of air which would cause a considerable
increase in smoke opacity due to unavoidable circumstances
(a variation in the atmospheric pressure; presence of dust
particles in the fan's air ducts, etc.). Smoke opacity depends
on the type of fuel utilized (the most recent provisions indi-
cate that it should not exceed n. 2 of the Bacharach Scale).
We advise, if possible, maintaining smoke opacity below n. 2 of
the Bacharach Scale even if, as a consequence, the CO
is slightly lower. The lower smoke opacity dirties the boiler less
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) should
2
to avoid operating with
2
value
2