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OPERATING DESCRIPTION
The gas train supplied is composed of an ON/OFF safety valve
and a single stage slow opening main valve.
The fuel flow rate regulation in the first and second stage is carried
out by a streamlined butterfly valve -6, activated by the electric
servomotor -7 .
The movement of the air shutter -8 is produced by the rotation
of the servomotor -7 through a lever and strap system (34). For
the adjustment of the air shutter position according to the power
burned in the first and second stage, consult section: "IGNITION
AND REGULATION". When the main switch -1 turns on, if the
thermostats are on, voltage reaches the control box which starts
the burner -2.
This turns on the fan motor -3 for pre-ventilation of the combu-
stion chamber. The rotation of the control servomotor -7 occurs
at the same time and brings the gas throttle -6 and the air shutter
-8 in the opening position corresponding to the second flame, by
leverage.
The preventilation phase comes only with the air gate in the se-
cond flame position.
At the end of the pre-ventilation stage, the gas throttle and the air
shutter are returned to the ignition flame position, then the ignition
transformer -4 comes on and, 2 seconds later, the gas valves -5
open.
The presence of the flame, detected by the control device, permits
continuation and completion of ignition, turning off the transformer.
Then passing on to the second stage of power through the pro-
gressive opening of the gas throttle and the air gate at the same
time .
At the moment in which the demand for heat from the system is
satisfied, the boiler thermostat will intervene and shut down the
boiler. The air shutter, through the rotation of the servomotor, will
reach the closed position when inactive.
In the event that the control device does not detect the presence
of a flame, the control box activates a “safety lock-out” -10 within
3 seconds of the turning off of the main valve. In “safety lock-out”
mode the valves are immediately closed again. To reset the con-
trol box from its safety position, press the reset button -9.
MV
GAS
1
3
9
10
2
1
6
4
5
sinottico_TBG1
100MC
1 ON / OFF main switch.
2 Power LED
3 AUTOMATIC - MANUAL operation selector
4 Ignition transformer indicator light
5 Gas valves indicator light
6 Fan motor thermal relay activation indicator light (if forese-
en)
9 MIN - MAX power selector switch
10 Reset button with lock-out indicator light
Summary of Contents for 67190010
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