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0006081362_200806
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METHANE GAS IGNITION AND ADJUSTMENT
1) Check that there is water in the boiler and that the gate valves
for the system are open.
2) Check, with complete certainty, that the discharge of combu
-
stion products can take place freely (boiler and flue gates
open).
3) Check that the voltage of the electrical line corresponds to
the burner voltage. Electrical connections (motor and main
line) must be prepared for the voltage available. Check that all
electrical connections made on-site are performed correctly as
shown in our wiring diagram. Prevent the second flame from
functioning by disconnecting the 4 pole connector (18) from
the electrical panel (0002935620) for TBG 45P-60P burners;
for TBG 45 60 burners, disconnect the wire from terminal 5 on
the terminal board on the printed circuit supplying coil Y2.
4)
Adjust air for the ignition flame :
- for TBG 45P - 60P burners with an electric servomotor, follow
the instructions given in card 0002934711;
- for burner TBG 45 - 60 with manual adjustment, adjust the air
for the second flame on the basis of the instructions given in
the section entitled “Diagram for adjustment of air in TBG 45-
60 single-stage burner”.
5) Carefully manoeuvre the gas adjustment device valve to open,
for the amount presumed necessary, the first flame flow adju
-
ster (see the instructions for the two-stage gas valve for the
model installed on the burner). If necessary, of course, open
the safety valve flow adjuster completely if there is one.
6) For three phases burners, with the switch I/O (22) on the burner
panel (see 000293560) at the position “0” and the main switch
on, check, closing the contactor manually, that the motor rota
-
tes in the right direction, if necessary swap the two power ca
-
bles for the motor around to change the direction of rotation.
7) Now switch on the control panel switch (22). The control equi
-
pment thus receives voltage and the programmer causes
the burner to switch on as described in the chapter “descrip
-
tion of working”. During the preventilation stage you must
check that the air pressure control switch carried out the
exchange (from the closed position without pressure detec
-
tion it must go to the closed position detecting air pressure).
If the air pressure switch does not detect sufficient pressure
(does not carry out the exchange) the ignition transformer is
not switched on, nor are the gas valves, and so the equipment
is stopped in its “lock-out” mode. On first switching on repea
-
ted “lock outs” may occur due to:
a) the gas piping not being freed of the air sufficiently and so
the gas quantity is not enough to provide a stable flame.
b) “lock out” with flame present maybe caused by instability in
the ionisation area, due to an incorrect air/gas ratio. This can
be remedied by varying the quantity of air and/or gas until
the right ratio is found. The same problem may be caused
by incorrect air/gas distribution in the combustion head. This
can be remedied with the combustion head adjustment de
-
vice by closing or opening further the air passage between
combustion head and gas diffusor.
c) It may happen that the ionisation current is interfered with
by the discharge current of the ignition transformer (the
two currents have a common path on the burner’s “mass”)
so the burner gets locked out due to insufficient ionisation.
This can be remedied by inverting the supply (230V side)
of the ignition transformer (swapping the two wires carrying
voltage to the transformer). This problem may also be cau
-
sed by an insufficient “ground connection” from the burner’s
casing.
8) With the burner on at minimum you must carry out an immediate
visual check on the extent of and appearance of the flame,
performing the necessary corrections with the gas and air sup
-
ply regulators (see points 4 and 5). Subsequently a check is
carried out on the quantity of gas supplied, by reading the me
-
ter. If necessary the gas supply and the corresponding com
-
bustion air can be corrected as previously described (points
4 and 5). Subsequently the combustion is checked with the
special instruments. For a correct air/gas ratio you must find
a carbon dioxide (CO2) value for the methane that is at least
8 % or O2 = 6% at minimum burner supply up to an optimal
value of 10 % or O2 = 3% for maximum supply. It is essential
to check, with a suitable instrument, that the percentage of
carbon monoxide (CO) present in the fumes does not exceed
the limit set by regulations at the time of installation.”
9) Repeatedly check that the first flame is supplied cor
-
rectly. After adjusting operation with the first flame, turn
off the burner, open the main switch and close the electri
-
cal circuit commanding inclusion of the second flame:
reinsert the 4 pole connector previously disconnected in the
case of TBG 45P-60P burners; reconnect the wire to terminal 5
on the terminal board on the printed circuit supplying coil Y2 in
the case of TBG 45-60 burners.
10) Open the manual regulator for the gas supply for the second
flame (main flame) to the presumed necessary quantity.
11) Now switch the burner on again, closing the master switch and
that on the control panel. The burner switches on and automa
-
tically switches on the second flame (main flame). Carry out an
immediate visual check on the extent of and
appearance of the flame, performing the necessary corrections
with the gas and air supply regulators as indicated in points 4
and 5.
12) Use the adjuster to set the correct flow for the second flame as
required for the specific case. You must not keep the burner
running if the capacity is greater than the maximum permitted
amount for the boiler, or there is a risk it could be damaged.
It is therefore best to stop the burner immediately after the
twometer readings.
13) Subsequently, with the burner at maximum supply required by
the boiler, check the combustion with the special instruments
and if necessary change the adjustment previously carried out
(air and possibly gas) with just the visual check (CO
2
max. =
10 % O
2
min =3% - CO max. = 0.1%
14) The air pressure switch is there to prevent the opening of the
gas valves if the air pressure is not that required. The pressure
switch must therefore be adjusted to intervene to close its con
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