Baltur TBG 120PN Instruction - page 37
35 / 69
000608042_200705
METHANE GAS IGNITION
AND ADJUSTMENT
1)Check that the combustion head
penetrates into the combustion
chamber to theextend required by
theboilermanufacturer.Checkthat
thedevicethatclosestheairatthe
combustion head is presumable in
the position suited for the required
supply of fuel (the passage of air
between the disk and combustion
headmustbesignificantlyreduced,
ifintheoppositecasethefuelsupply
isratherhigh,thepassagebetween
disk and combustion head must
be relatively open). See chapter
“Adjustmentofcombustionhead”.
2)Ifithasnotalreadybeendownwhen
connecting the burner to the gas
piping, it is essentially to vent the
air in the pipes, which should done
with doors and windows open. The
connector on the piping close to the
burner must be opened and then
thetaportapsthatshutoffthegas
mustbeopenedabit.Waituntilyou
cansmellthegasandthenclosethe
tap. Wait a sufficient length of time,
which will depending on the specific
conditions, until the gas in the room
disperses outside and then connect
uptheburneragaintothegaspiping.
3)Check that there is water in the
boiler and that the system’s gate
valvesareopen.
4)Check very thoroughly that the
combustion products exhaust path
isfree(boilergatesandflueopen).
5)Checkthatcurrenttobeconnected
corresponds with that required by
the burner and that the electrical
connections (motor and main line)
are set for the available power
supply.Checkthatalltheelectrical
connectionscarriedoutonsitehave
been correctly performed as in our
wiringdiagram.
6)Applyapressuregaugewithsuitable
scale to the gas pressure outlet to
checkthesetvalue(ifthepressure
provided for permits it is preferable
to use a water column instrument
andnotusethosewithpointersfor
modestpressures).
7)Put the air adjustment electric
servo motor cams (see instructions
page.....) to the positions you
presume are suitable in proportion
to the minimum and maximum
modulation thermal flow and to the
ignitionheatinput.
8) Set the desired value for the ratio
betweenthegasandairpressures,
following the pneumatic valves
adjustmentinstructionsgiveninthe
manual provided with the gas train
installed
9)Withtheburnerpanelswitchatthe
“O” position and the main switch
on, check, by manually closing the
contactor,thatthemotorturnsinthe
correctdirection,ifnecessary,swap
around the two power cables for
the three-phase motor to invert the
directionofrotation.
10) Now switch on the control panel
switch and turn the modulation
switchestoMIN(minimum)andMAN
(manual). The control box is now
powered up and the programmer
sets the burner as described in the
chapter“descriptionofworking”.
Note: Preventilation is carried out
with air open and so the adjustment
servo motor is switched on performs
itscompleteopeningrunuptotheset
“maximum”.Onlywhentheadjustment
servomotorhasreturnedtothe“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
positionwithairpressuredetection).
If the air pressure switch does not
detect sufficient pressure (does not
carry out the exchange), the ignition
transformer does not switch on and
the valves for the ignition flame also
do not switch, with the result that the
controlboxgoesto“lock-out”.Itshould
bepointedoutthatsome“lockingout”
duringthisphaseoffirstswitchoncan
be regarded as normal because the
rampvalvespipingwillstillhavesome
airinthemandthismustbeeliminated
beforeastableflamecanbeachieved.
To“release”thelockpressthe“release”
button.
On first switching on, repeated “lock
outs”mayoccurdueto:
a)The gas piping not being freed of
the air sufficiently and so the gas
quantityisnotenoughtoprovidea
stableflame.
b)The “lock-out” with flame on may
be caused by flame 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.
Thesameproblemmaybecaused
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
betweencombustionheadandgas
diffuser.
11) Set the burner at minimum
thermal capacity of modulation
(air damper control servo motor
at minimum), check the size and
appearance of the flame, making
any necessary corrections. To do
this,followtheeinstructionsforthe
pneumaticvalves.Thencarryouta
meterreadingcheckonthequantity
ofgassupplied.Ifnecessaryadjust
gas and combustion air supply as
described previously (points 7 and
8). Subsequently the combustion
is checked with the special
instruments. For the correct air-gas
mix,thecarbondioxidelevelmustbe
measured.(C02)forthemethaneis
atleast8%orO2=6%onminimum
burner supply up to a ideal value
of 10% or 02= 3% for maximum
supply. It is essential to check,
with a suitable instrument, that the
percentage of carbon monoxide
(CO)presentinthefumesdoesnot
exceedthelimitsetbyregulations
atthetimeofinstallation.”
12) After adjusting the burner to
minimum thermal capacity, turn
the modulation switches to MAN
(manual) and MAX (maximum).
The servo motor that regulates the
airisputat“maximum”andsoalso
the gas supply reaches maximum
thermal capacity. A check must
thenbecarriedoutonthequantity
of gas supplied (by reading the
meter).Withburneronatmaximum
existing supply, the gas flow is
measuredasthedifferencebetween
the two readings at exactly one
minutebetweenoneandtheother.
Multiplyingthevalueobtainedbysixty
youobtaintheflowinsixtyminutes,
i.e.perhour.Multiplyingthesupply
perhour(m3/h)forthegascalorific
poweryouobtainthepowersupply
inkcal/hwhichmustcorrespondto
orbeveryneartothatrequiredby
theboiler(lowestcalorificpowerfor
methane = 8550 kcal/h). You must
prevent the burner from continuing
toruniftheflowisgreaterthanthe
maximumpermittedfortheboiler,to
avoidpossibledamagetotheboiler
itself, and so the burner should be
stoppedstraightafterthetwometer
readings.
13)Tochangethemaximumgasflow,
usetheairflowregulatorsothatthe
gas is suitably and automatically
adjusts itself to the supply of air.
The cam regulating the maximum
openingofthedampermustbereset
(see instructions on adjustment
0002933650). The air damper
opening angle must be reduced to
reducethegasflowandviceversa;
to change the gas-air mix see the
instructions for the pneumatic gas
valvesinstalled.
14)Subsequentlycheckthecombustion
with the special instruments. For
a correct air-gas mix you must
measure the carbon dioxide (CO2)
tomethanevalueandcheckthatitis