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Idiomas disponibles
Idiomas disponibles
ELECTRICAL CONNEC-
TIONS
The electric lines should be at an
adequate distance from hot parts. It
is advisable to make all connections
with flexible electric wire. Minimum
section of conductors 1.5 mm
64/8 .I.07).
DESCRIPTION OF OPERA-
TIONS
Switch off the general switch, if the
thermostats are off, and voltage
goes to the command and control
device which, after a short interval
(9 second), will start uf the burner
according to the set program. The
air gate servomotor switches and
goes into 2nd flame position; than
the fan motor goes into operation
and makes the combustion cham-
ber preventilation. At the end of the
preventilation phase the combustion
air gate is reset in the 1st flame
position. The ignition procedure will
then start and, after seconds, the
safety valve and "first flame" (pilot
light) valve will open up. A flame will
then apper, which will be detected
by the flame control device, thus
completing the ignition procedure.
The air shutter control servo will then
be switched on, which will move to
the second flame setting, as set by
the operator in each specific case,
and at the same time an auxiliary
contact on the servo will activate
the second flame valve. If the flame
does not light, the burner will go
into the "safety shutdown" state, 3
second after the opening of the gas
valves (pilot and safety). If a "safety
shutdown" occurs, the gas valves
will be closed immediately. To go out
of the shutdown state, press the red
button on the burner unit.
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
. (CEI
and windows should be opened.
2
Open the pipe union on the pipeline
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.
2) O p e n t h e c o m b u s t i o n a i r
regulator to the appropriate
level (see "air shutter control
servo regulation, type STA 5 B
0.6/8.N2") and open the air
passage between the head and
the flame disk (diffuser) to about
a third (see regulation of the
combustion head BT 8769/2/GB
- 000292171).
) Adjust the regulators on the
safety and "first flame" valves
so that the gas delivery (ignition
flow rate) is at the appropriate
level.
N.B. Refer to the specific
description of the operations
necessary for setting the gas
delivery rate according to the
type of valves fitted to the burner
(see last page).
4) N.B. On some burner models,
the thermostat of the 2 nd
flame must be at 2 contacts (in
exchange); plase do refer to the
eletric diagram of the specific
burner, in case you haven't the
termostat in exchange at two
contact, plase do refer to the
diagram 0002050151.
Switch off the second flame
thermostat and send current to
the burner by switching on the
0006080480_200710
a- The gas pipeline has not been
b- A "shut down" with flame
c- It could happen that the ionisation
29 / 6
general switch. The burner will
thus be switched on and the pre-
ventilation will be performed.
If the air pressure exceeds
that value at which the air
pressure switch has been set,
the ignition transformer will be
connected and, subsequently,
the gas valves (safety and
operating) will be inserted.
The valves open completely is
limited to the position at which
the flow regulator incorporated
in the operating valve has
been manually regulated. At
first ignition, successive "shut
downs" could occur, due to the
following reasons:
adequately purged of air and
therefore the quantity of gas is
not sufficient to allow for a stable
flame.
presence could be caused by
flame instability in the ionisation
zone, due to and incorrect air/
gas ratio. This can be remedied
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/gas
in the combustion head. This
can be corrected by operating
the regulation device 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".
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 (20V side) of the
ignition transformer (change the
places of the two wire that take
voltage to the transformer). A
shut down with flame presence
could also be caused by the
burner 's casing not being
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