baltur GI Series Instruction page 27

to the programme previously described.
During normal operations, the boiler thermostat (or pres-
sure switch) of the 2 stage fitted to the boiler detects the
nd
variations requested and automatically proceeds with adap-
ting the fuel and combustion air delivery by inserting the
servomotors which regulates delivery (gas/air). This will rotate in
such a way as to obtain an increase or a decrease. With this ma-
noeuvre, the gas/air delivery regulating system try's to equilibrate
the quantity of heat supplied to the boiler with that which the boiler
gives to be utilised. If the flame does not appear within THREE se-
conds of the opening of the gas valve, the control box goes to "shut
down" (the burner stops completely and the relative indicator light
is turned on). To unblock the control box,the eliminate interference
button must be pressed for about half a second.
DESCRIPTION OF OPERATIONS AT MODULATION
FLAME
The approximate delivery variation range is, indicatively, from 1
to 1/5. Ignition is preceded by pre-ventilation of the combustion
chamber as per standards, with the air open: this lasts about 36
seconds. If, at the end of the ventilation stage, the ventilation air
pressure control switch detects that pressure is sufficient, the
ignition transformer comes on and, after 3 seconds, the safety and
main valves open in sequence. The gas reaches the combustion
head, is mixed with the air being delivered by the fan, and is ignited.
Delivery is regulated by the gas throttle valve. Three seconds after
the (main and safety) valves are opened the ignition transformer
is switched off. The burner is now on at the ignition point (P0). The
flame is detected by the relative control device (an ionisation sensor
positioned inside the flame). The programming relay goes beyond
the shutdown position and powers the air/gas delivery regulation
servomotors, which go to minimum (P1). If the modulation sensor
– adjusted by a temperature or pressure lower than that in the boiler)
– allows, the air/gas delivery servomotors start running and cause a
gradual increase is the delivery of gas and combustion air until the
maximum flow rates to which the burner has been set have been
reached (point P9).
N.B. Electronic cam MPA 22 controls the burner by adjusting
the combustion air and gas servomotors according to a pre-set
operating curve.
The burner remains at the maximum delivery position until the
temperature or pressure reaches the limit set for the intervention
of the modulation probe and makes the servomotors regulating
gas/air delivery rotate in the opposite sense of direction. Thus gas
delivery and the relative combustion air are gradually reduced until
they reach minimum level. Even with delivery at a minimum, if
the limit (temperature or pressure) at which the shut down device
(thermostat or pressure switch) has bee regulated is reached, the
burner will be brought to a standstill.
When the temperature or pressure drops below the intervention
limit set on the shut down device, the burner will start up again,
according to the programme previously described.
During normal operations, the boiler modulation probe fitted to the
boiler detects the variations requested and automatically proceeds
with adapting the fuel and combustion air delivery by inserting the
servomotors which regulates delivery (gas/air). This will rotate in
such a way as to obstain an increase or a decrease.
6
5
1 Main ON-OFF switch
2 Thermostat line switch
3 DUNGS Dispay
4 Control box lock-out light
With this manoeuvre, the gas/air delivery regulating system try's to
equilibrate the quantity of heat supplied to the boiler with that which
the boiler gives to be utilised. If the flame does not appear within
THREE seconds of the opening of the gas valves, the control box
goes to "shut down" (the burner stops completely and the relative
indicator light is turned on). To unblock the control box, press the
appropriate push-button.
STARTING UP AND REGULATION WITH METHANE
1) If not already done at the moment of connecting the burner
to the gas pipeline, it is indispensable to carry out 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 gas 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 room has dispersed, and
then reconnect the burner to the gas pipeline. Subsequently,
re-open the gas cut-off cock.
2) Check that there is water in the boiler and that the system's
gate valves are open.
3) Check, with absolute certainty that the discharge of combustion
products can take place freely (boiler and chimney lock-gates
should be open).
4) Make sure that the voltage of the electric line to which the
burner is to be connected,corresponds to that required by the
burner and that the electrical connections (motor and principle
line) have been prepared to mach the voltage rating available.
Also check that all the electrical connections carried out on the
spot are in accordance with our electric wiring diagram.
5) Make sure that the combustion head is long enough to enter
the furnace to the extent specified by the boiler manufacturer.
Check that the device which regulates the air on the combustion
head is in the position considered necessary for the fuel delivery
required (air passage between the disk and the head should be
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3
7
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2
5 Live voltage light
6 Fan working light
7 Safety fuses
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