Natural Gas Starting Up And Regulation - baltur BTG 15P Manuel D'installation, Utilisation Et Entretien

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
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
E place freely (chimney lock-gates should be open) and that there
is water in the boiler.
N
2) Open as much as considered necessary, the combustion air
regulator, (see 0002934230) and open by about one third the
G
air passage between the head and the flame disk (diffuser) see
L "Air regulation on combustion Head".
3) Operate the regulators incorporated in the gas valves in such
I
a way as to obtain the gas delivery presumed necessary (see
0002910311).
S
4) Disconnect the 2nd flame thermostat and give current to the
H
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 value at which the air pressure switch has
been set, the ignition transformer will be connected and, sub-
sequently, the gas valves (safety and 1
The valves open completely and gas delivery is limited to the
position at which the flow regulator incorporated in the 1
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 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 combu-
stion 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".
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 insufficient
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
5) With the burner on, adapt delivery to that desired (methane gas
6) Control that combustion occurs correctly by using the appropriate instru-
7) After regulation, turn the burner off and on again several times to
8) Now close the main switch to start up the burner. When the
flame) will be inserted.
st
flame
st
9) Control the efficiency of the safety devices: the "shut
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the minimum value of the ionisation current to ensure the
working of the control box is shown in the electrical diagram;
normally the ionisation current is decidedly higher. To check
the ionisation current, connect a microammeter with an ade-
quate scale "in series" to the ionisation circuit. The cable of
the ionisation electrode is equipped with a connector (see
circuit diagram) to facilitate the micro-ammeter connection.
The high isolation wire that comes from the electrode must
be inserted to the negative (sign -) of the microammeter.
= 8550 kcal/m ) by reading the meter. Take two readings, the
3
second one exactly one minute after the first one. The difference
between the two readings schould be multiplied by in order
to obtain the flow per hour (60 minutes). This output can be
modified by operating the special regulator incorporated in the
valve (see the last pages for a desciption of how to regulate
the valves).
ments (CO = about 10% for methane gas - CO max. = 0.1%).
2
check that ignition occurs correctly. With the burner disconnected
from the main switch, connect the 2
regulate the special device on the servomotor in such a way
as to obtain an opening of the air shutter presumed necessary
for the 2 flame (see 0002934230). Open as well the gas flow
nd
regulator incorporated in the valve to allow for the correct delivery
presumed necessary for the 2
nd
burner has started up it is necessary to check, as previously
shown, the gas delivery and the combustion with the appropriate
instruments. When the results are known, if necessary, proceed
with varying the gas delivery and the relative combustion air
in order to adapt delivery to that required for the specific case
(boiler potentiality). It is also necessary to check if the CO
CO values are adequate (CO max. = about 10% for Methane
2
gas and CO = 0.1%).
down" (by detaching the ionisation electrode cable), the
air pressure switch, the gas pressure switch, the gas pressure
switch and the thermostats).
N.B. The pressure switch is self-controlled and trefore it must
close the contact, which is foreseen to be closed at rest,
(fan stops and consequently there is an absence of air
pressure in the burner); if it does not, the control box will
not be inserted (the burner remains at as standstill). It must
be specified that if the contact is not closed during working,
the control box will carry out its cycle, but the ignition
transformer will not be inserted and the gas valves will not
open. Consequently, the burner will go to shut down. Check
that the air pressure switch functions properly with burner
operating at 1 flame only, increase the regulating value
st
until it reaches intervention point and the burner should
go to shut down. To ublock the burner, press the special
pushbutton and return the pressure switch regulator to
a sufficient value in order to measure the air pressure
existing during the pre-ventilation phase.
flame thermostat and
nd
flame (main flame).
and
2