Baltur SPARKGAS 20 - 20W Instruction - page 29
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0006080479_00710
ELECTRICAL CONNEC-
TIONS
The electric lines should be at an
adequate distance from hot parts.
Itisadvisabletomakeallcon-
nectionswithflexibleelectricwire.
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
willreachthecontrolboxand,after
a short time (8 second), the burner
willstartupaccordingtoitspre-esta-
blished programme. The fan motor
willthenbeturnedonand,whenit
startsfunctioning,itwillbringabout
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
appearsinthiswayand,detectedby
it’sowncontroldevice,itpermitthe
continuation and completion of the
ignitionphase.Inthecaseofflame
failure, the control box activates a
“safetyshutdown”withintwosecon-
ds of the opening of the gas valves
(operatingandsafety).Whenthereis
a“safetyshutdown”thegasvalves
are immediately re-closed. To un-
blockthecontrolboxfromthesafety
position, push the red button on the
control panel.
NATURAL GAS STARTING
UP AND REGULATION
(for LPG operation see the
relative chapter)
Inordertoproceedwithstartingup,
it’snecessary,iftheburneristhree-
phase, to check that the sense of
rotation of the motor is correct. If
notalreadydonesoatthemoment
of connecting the burner to the gas
pipeline,it’sindispensabletocarry
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
(orcocks).Whenthecharacteristic
ENGLISH
odour of gas can be smelled, close
thecut-offcock.Waituntilthegas
present in the room has dispersed,
and then reconnect the burner to
the gas pipeline. Then proceed as
follows:
1) Makesurethatthedischarge
of combustion products can
takeplacefreely(chimneylock-
gates should be open) and that
thereiswaterintheboiler.
) 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
opentheairpassagebetween
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
awayastoobtainthegasdeli-
verypresumednecessary.
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,
thegasvalves(safetyandopera-
ting)willbeinserted.Thevalves
opencompletelyislimitedtothe
positionatwhichtheflowregula-
tor incorporated in the operating
valvehasbeenmanuallyregula-
ted. At first ignition, successive
“shutdowns”couldoccur,dueto
thefollowingreasons:
a- The gas pipeline has not
been adequately purged of
airandthereforethequantity
ofgasisnotsufficienttoal-
lowforastableflame.
b-A“shutdown”withflamepre-
sencecouldbecausedbyfla-
meinstabilityintheionisation
zone, due to and incorrect air/
gas ratio. This can be reme-
died by varying the quantity
of air and/or gas delivered, in
ordertofindthecorrectratio.
Itcouldalsobecausedbyan
incorrect distribution of air/
gas in the combustion head.
This can be corrected by
operating the regulation de-
vice of the combustion head
by closing or opening more
theairpassagebetweenthe
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
twocurrentshavetorunthe
same course on the burner’s
”earth”) and so the burner
goes to “shut down” due to
insufficient ionisation. This
canberemediedbyinverting
the input (0V side) of the
ignition transformer (change
the places of the two wire
thattakevoltagetothetran-
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-
retheworkingofthecontrol
boxisshownintheelectrical
diagram;normallytheionisa-
tion current is decidedly hi-
gher.Tochecktheionisation
current, connect a microam-
meterwithanadequatescale
“in series” to the ionisation
circuit. The cable of the ioni-
sation electrode is equipped
withaconnector(seecircuit
diagram) to facilitate the mi-
cro-ammeter connection. The
highisolationwirethatcomes
from the electrode must be
inserted to the negative (sign
-) of the microammeter.
5)Withtheburneron,adaptdelive-
rytothatdesired(methanegas
=8550kcal/m
) by reading the
meter. Take two readings, the
secondoneexactlyoneminute
afterthefirstone.Thedifferen-
ce between the two readings
schould be multiplied by in or-
dertoobtaintheflowperhour
(60 minutes). This output can be
modified by operating the spe-
cial regulator incorporated in
the valve (see the last pages for