NATURAL GAS IGNITION AND REGULATION
Verify the combustion chamber does not contain gas before any
ignition operation.
Carry out a check of the equipment before commissioning, after each
overhaul and after the equipment has been inactive for a long time.
When starting the burner, perform the following actions:
•
attempting a start up without introducing gas, verify a lock out stop
occurs at the end of the safety time;
•
stopping the gas supply with the appliance in the steady state
position, verify that after a repeat cycle, the appliance performs a
lockout stop;
•
The time and cycle comply with those indicated for the type of
equipment used.
•
The flame signal level is sufficiently high.
•
Check that the ignition electrodes are adjusted as shown in the
diagram.
•
The intervention of limiters or safety devices causes a shut down
or safety stop of the equipment according to the type of application
and modes foreseen.
•
Make sure that the combustion products may be freely vented
through the boiler and flue dampers.
•
Make sure that the mains voltage corresponds to the manufacturer's
requirements and that all electrical connections made at the
installation site are effected properly as illustrated in our wiring
diagram.
•
Check that there is water in the boiler and that the gate valves of
the system are open.
•
Open the combustion air regulator as necessary and open approx.
a third of the passage of air between flame disk and head (diffuser).
Act on the regulators incorporated in the safety and operating valve
in such a way as to obtain the gas delivery deemed to be necessary.
•
Power the burner by connecting the main switch.
•
The burner is therefore activated 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, subsequently, the gas valves (safety and operating) will be
inserted.
•
The valves open completely and the gas delivery is limited to
the position at which the flow regulator incorporated in the main
operating valve has been manually regulated.
•
Upon first switching on, repeated “lock outs” may occur due to:
•
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.
•
“Lock out” with flame presence could be caused by flame instability
in the ionisation area, due to an incorrect air/gas ratio.
•
This can be solved by changing the amount of air and/or gas
supplied, so as to find the right ratio.
BTG 3
A
B
D
C
0002931
131
1 Screw for adjusting air damper opening
2 Air damper opening reference index
3 Closed damper: reference index in position “0”
4 Damper fully open: reference index in position “0”
BTG 6 - 12
4
1
2
3
8922/2
1 Screw for adjusting air damper opening
2 Air damper opening reference index
3 Closed damper: reference index in position “0”
4 Damper fully open: reference index in position “0”
•
This problem could also be caused by an incorrect distribution of
air/gas in the combustion head.
•
This can be solved with the combustion head adjustment device by
further closing or opening the air passage between the combustion
head and gas diffuser, through the flame disk adjustment system.
•
It may occur that the ionisation current is disturbed by the discharge
current of the ignition transformer (the two currents have a common
path on the burner’s “mass”). Therefore, the burner locks out due to
an insufficient ionisation.
•
This can be solved by verifying the correct position of the ignition
electrode.
•
A shut down with flame presence could also be caused by the
burner’s casing not being properly “grounded”.
•
The minimum ionisation current value required for a correct
operation of the equipment is indicated in the wiring diagram.
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0006080749_202206
ENGLISH
Summary of Contents for 17020010
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