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Idiomas disponibles
Idiomas disponibles
STARTING UP AND REGULATION WITH METHANE
1) If not already done at the moment
of connecting the burner to the gas
pipeline, it is indispensable to carry
out a purge of the air contained in
the pipeline. As a precaution, special
care should be taken and doors and
windows should be opened. Open
the pipe union on the pipeline situa-
ted near the burner and then open a
little the gas cut-off cock (or cocks).
When the characteristic odour of
gas can be smelled, close the cut-
off cock. Wait until the gas present in
room has dispersed, and then recon-
nect the burner to the gas pipeline.
Subsequently, re-open the gas cut-
off cock.
2) Check that there is water in the boi-
ler and that the system's gate valves
are open.
3) Check, with absolute certainty that
the discharge of combustion pro-
ducts can take place freely (boiler
and chimney lock-gates should be
open).
4) 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
electrical connections (motor and
principle line) have been prepared
to match the voltage rating available.
Also check that all the electrical con-
nections carried out on the spot are
in accordance with our electric wiring
diagram.
5) Make sure that the combustion head
is long enough to enter the furnace
to the extent specifi ed by the boiler
manufacturer. Check that the device
which regulates the air on the com-
bustion head is in the position consi-
dered necessary for the fuel delivery
required (air passage between the
disk and the head should be consi-
derably reduced when the fuel deli-
very is reduced; on the other hand,
when the fuel delivery is fairly high,
the air passage between the disk
and the head should be relatively
open). See Chapter "Air Regulation
on the Combustion Head".
6) Apply a manometer with an adequa-
te scale (if the entity of pressure fo-
recast allows it is preferable to use a
column of water instrument, do not
use a pointer instrument for modera-
te pressure) to the pressure plug on
the gas pressure switch.
7) With the switch (1) (see page 34) on
the burner's control panel in the "0"
position and the main switch inserted
check, by manually closing the relay,
that the motor rotates in the right di-
rection. If it does not, exchange the
places of two cables of the motor's
supply line in order to invert its sense
of rotation.
8) Using the commands on the MPA
22 keyboard (see instructions for the
MPA 22 electronic cam in the enclo-
sed manual cod. 0006080905), set
the air servomotor angles of rotation
for the startup position (P0), for the
minimum and maximum fl ow (P1 and
P9) and for closure of the air damper
with burner paused. These values
are pre-set in the factory: the value
of all pre-set parameters is given in
the table provided with the burner.
9) Set the desired value for the ratio
between the gas and air pressures,
following
the
pneumatic
adjustment instructions given in the
manual provided with the gas train
installed.
10) Now switch on the control panel
switch. The control box is now
powered up and the programmer
sets the burner as described in the
chapter "description of working".
Note: Preventilation is carried out
with air open and so the adjustment
servo motor is switched on performs
its complete opening run up to the set
"maximum". Only when the adjustment
servo motor has returned to the "switch
on" position will the control box carry
out its ignition program, switching on
the transformer and gas valves for
ignition. Check during preventilation
that the pressure switch that controls
air pressure in fact exchanges (from
the closed position where no pressure
is detected it must pass to the closed
position with air pressure detection).
If the air pressure switch does not
detect suffi cient pressure (does not
carry out the exchange), the ignition
transformer does not switch on and
the valves for the ignition fl ame also
do not switch, with the result that the
control box goes to "lock-out". It should
be pointed out that some "locking out"
during this phase of fi rst switch on can
be regarded as normal because the
ramp valves piping will still have some
air in them and this must be eliminated
before a stable fl ame can be achieved.
To "unlock", press the interference
elimination button on the MPA 22
display (see page 34).
Then use the MPA 22 keyboard to
correct the air damper maximum
aperture position (see instructions in
35 / 69
0006081046 - ed 2006/09
the manual cod. 0006080905). On fi rst
switching on, repeated "lock outs" may
occur due to:
a) The gas piping not being freed of
the air suffi ciently and so the gas
quantity is not enough to provide a
stable fl ame.
b) The "lock-out" with fl ame on may
be caused by fl ame instability in
ionisation area, due to incorrect
air-gas mix. This can be remedied
by varying the quantity of air and/
or gas until the right ratio is found.
The same problem may be caused
by incorrect air/gas distribution in
the combustion head. This can
be remedied with the combustion
head adjustment device by closing
or opening further the air passage
between combustion head and gas
diffuser.
11) Set the burner at minimum thermal
capacity of modulation (P1), check
valves
the size and appearance of the fl ame,
making any necessary corrections.
To do this, follow the e instructions
for the pneumatic valves. Then carry
out a meter reading check on the
quantity of gas supplied. If necessary
adjust gas and combustion air
supply
as
described
(points 8 and 9). Subsequently the
combustion is checked with the
special instruments. For the correct
air-gas mix, the carbon dioxide level
must be measured. (C02) for the
methane is at least 8% or O2=6%
on minimum burner supply up to a
ideal value of 10% or 02= 3% for
maximum supply. It is essential
to use the special instrument to
check that the percentage of carbon
monoxide CO in the fumes does
not exceed the maximum permitted
value of 0.1% (1000 p.p.m.)
12) After adjusting the burner to the
minimum
thermal
the air regulator servomotor to
maximum aperture (P9), so that
the gas fl ow will also adjust to
the maximum thermal capacity.
A check must then be carried out
on the quantity of gas supplied (by
reading the meter). With burner on
at maximum existing supply, the gas
fl ow is measured as the difference
between the two readings at exactly
one minute between one and the
other. Multiplying the value obtained
by sixty you obtain the fl ow in sixty
minutes, i.e. per hour. Multiplying
the supply per hour (m3/h) for the
gas calorifi c power you obtain the
power supply in kcal/h which must
correspond to or be very near to that
required by the boiler (lowest calorifi c
previously
capacity,
set
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