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ELECTRICAL CONNEC-
TIONS
The electric lines should be at an
adequate distance from hot parts.
It is advisable to make all con-
nections with flexible electric wire.
Minimum section of conductors 1.5
mm
. (CEI 64/8 .I.07).
DESCRIPTION OF OPERA-
TIONS
By closing the main switch, and if
the thermostats are closed, voltage
will reach the control box and, after
a short time (8 second), the burner
will start up according to its pre-esta-
blished programme. The fan motor
will then be turned on and, when it
starts functioning, it will bring about
a pre -washing of the combustion
chamber. Subsequently, ignition is
connected and, after three seconds,
the safety valve and the operating
(main) valve will open. The flame
appears in this way and, detected by
it's own control device, it permit the
continuation and completion of the
ignition phase. In the case of flame
failure, the control box activates a
"safety shut down" within two secon-
ds of the opening of the gas valves
(operating and safety). When there is
a "safety shut down" the gas valves
are immediately re-closed. To un-
block the control box from the safety
position, push the red button on the
control panel.
NATURAL GAS STARTING
UP AND REGULATION
(for LPG operation see the
relative chapter)
In order to proceed with starting up,
it's necessary, if the burner is three-
phase, to check that the sense of
rotation of the motor is correct. If
not already done so at the moment
of connecting the burner to the gas
pipeline, it's indispensable to carry
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 pipe-
line situated near the burner and
then open a little the 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 the room has dispersed,
and then reconnect the burner to
the gas pipeline. Then proceed as
follows:
1) Make sure that the discharge
of combustion products can
take place freely (chimney lock-
gates should be open) and that
there is water in the boiler.
) Open the combustion air regu-
lator to the appropriate level
(see 0009060, "air shutter
control servo regulation, type
STA 5 B 0.6/8. N6L") and
open the air passage between
the head and the flame disk
(diffuser) to about a third
(see regulation of the combu-
stion head BT 8769//GB and
0009161).
) Operate the regulators incorpo-
rated in the gas valves in such
a way as to obtain the gas deli-
very presumed necessary.
4) Give current to the burner by
opening the main switch. The
burners is then turned on and
carries out the pre-ventilation
phase. If the air pressure excee-
ds that value at which the air
pressure switch has been set,
the ignition transformer will be
connected and, subsequently,
the gas valves (safety and opera-
ting) will be inserted. The valves
open completely is limited to the
position at which the flow regula-
tor incorporated in the operating
valve has been manually regula-
ted. At first ignition, successive
"shut downs" could occur, due to
the following reasons:
a- The gas pipeline
been adequately purged of
air and therefore the quantity
of gas is not sufficient to al-
low for a stable flame.
b- A "shut down" with flame pre-
sence could be caused by fla-
me instability in the ionisation
zone, due to and incorrect air/
gas ratio. This can be reme-
died by varying the quantity
of air and/or gas delivered, in
order to find the correct ratio.
It could also be caused by an
incorrect distribution of air/
9 / 66
0006080479_00710
gas in the combustion head.
This can be corrected by
operating the regulation de-
vice of the combustion head
by closing or opening more
the air passage between the
head and the gas diffuser.
See chapter "regulation of
the combustion head".
c- It could happen that the ioni-
sation current is help up by
the current discharged from
the ignition transformer (the
two currents have to run the
same course on the burner's
"earth") and so the burner
goes to "shut down" due to
insufficient ionisation. This
can be remedied by inverting
the input (0V side) of the
ignition transformer (change
the places of the two wire
that take voltage to the tran-
sformer). A shut down with
flame presence could also
be caused by the burner's
casing not being properly
"grounded". We must point
out that the minimum value of
the ionisation current to ensu-
re the working of the control
box is shown in the electrical
diagram; normally the ionisa-
tion current is decidedly hi-
gher. To check the ionisation
current, connect a microam-
meter with an adequate scale
"in series" to the ionisation
circuit. The cable of the ioni-
sation electrode is equipped
with a connector (see circuit
diagram) to facilitate the mi-
cro-ammeter connection. The
high isolation wire that comes
from the electrode must be
inserted to the negative (sign
has not
-) of the microammeter.
5) With the burner on, adapt delive-
ry to that desired (methane gas
= 8550 kcal/m
meter. Take two readings, the
second one exactly one minute
after the first one. The differen-
ce between the two readings
schould be multiplied by in or-
der to obtain the flow per hour
(60 minutes). This output can be
modified by operating the spe-
cial regulator incorporated in
the valve (see the last pages for
) by reading the
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