Natural Gas Starting Up And Regulation - baltur BTG 6 Manual De Instrucciones

NATURAL GAS STARTING UP AND REGULATION

(for LPG operation see the relative chapter)
1) Make sure that the discharge of combustion products can take
place freely (chimney lock-gates should be open) and that the-
re is water in the boiler.
2) Check the voltage on the mains to which the unit is to be connec-
ted: make sure that it corresponds with burner requirements
and that all electrical connections made at the installation site
are effected properly as illustrated in our wiring diagram.
3) Open as much as considered necessary, the combustion air re-
gulator, and open by about one hird the air passage between
the head and the disk by operating the regulating screw of the
flame disk (diffuser). (See regulation of the combustion head
0002933472).
4) Operate the regulators incorporated in the gas valves in such a
way as to obtain the gas delivery presumed necessary. (see
0002910300 and 0002910220).
5) 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 exceeds that va-
lue at which the air pressure switch has been set, the
ignition transformer will be connected and, subsequen-
tly, 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:
a- The gas pipeline has not been adequately purged of air and
therefore the quantity of gas is not sufficient to allow for a
stable flame.
b- A "shut down" with flame presence could be caused by fla-
me 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 ra-
tio. 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.
c- It could happen that the ionisation 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 in-
sufficient ionisation. This can be remedied by inverting the
input (230V 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 properly "grounded". We
must point out that the minimum value of the ionisation cur-
rent to ensure the working of the control box is shown in the
electrical diagram.
6) With the burner on, adapt delivery to that desired, by reading
the meter. This output can be modified by operating the spe-
cial regulator incorporated in the valve (see the following pa-
ges for a desciption of how to regulate the valves).
1) Vite di regolazione apertura serranda aria
2) Indice di riferimento apertura serranda aria
3) Serranda chiusa: indice di riferimento in posizione "0"
4) Serranda tutta aperta: indice di riferimento in posizione "9"
7) Control that combustion occurs correctly by using the appropria-
te instruments (CO
0.1%).
8) After regulation, turn the burner off and on again several times to
check that ignition occurs correctly.
9) When the has started up it is necessary to check as previously
shown, the gas delivery and the combustion with the appro-
priate instruments. When the results are known, necessary,
proceed with varying the gas delivery and relative combustion
air in order to adapt delivery to that required for the specific
case (boiler potentiality). It's also necessary to check if the
CO and CO values are adequate (CO
2
methane gas and CO = 0.1%).
10) Control the efficiency of the safety devices: the "shut down"
(by detaching the ionisation electrode cable), the air pressure
switch, the gas pressure switch, the gas pressure switch and
the thermostats).
7 / 20
0006080749_201009
= about 10% for methane gas -CO max. =
2
max. = about 10% for
2
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