baltur GI 500 MC, Installation, Use And Maintenance Instruction Manual

Page: 52 / 76

ENGLISH
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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 carri-
ed out by a streamlined throttle valve -6, activated by the electric
servomotor -7.
The movement of the air shutter is produced by the rotation of the
servomotor -7 through the (34) lever and tie rods.
For the adjustment of the air damper position according to the
power burned in the first and second stage, consult section: “Star-
ting up and adjustment”.
If when the main switch -1 is closed, the thermostats are closed,
the voltage reaches the command and control equipment which
starts the burner -2.
This turns on the fan motor for preventilation of the combustion
chamber.
At the same time the rotation of the command servomotor -7 whi-
ch brings the gas throttle -6 and the air gate -8, through the action
of leverage, in the opening position corresponding to the second
flame.
The preventilation phase comes only with the air gate in the se-
cond flame position.
At the end of pre-ventilation, the gas throttle and the air shutter are
returned to the ignition position, then the ignition transformer turns
on and the gas valves open.
The presence of the flame, detected by the control device, permi-
ts continuation and completion of ignition, turning off the ignition
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 shut down” -10 wi-
thin three seconds of the opening of the main gas valve. In “safety
lock-out” mode the valves are closed again immediately.
To release the equipment from its safety position, press the rele-
ase button -10
Modulation Seal control
1 ON / OFF main switch.
2 Power LED
3 AUTOMATIC - MANUAL operation selector
9 MIN - MAX power selector switch
10 Reset button with lock-out indicator light