Description Of Working - baltur BGN 200 LX Instrucciones

DESCRIPTION OF WORKING

Closing switch 1, if the thermostats are
closed, the voltage reaches the com-
mand and control equipment (switching
on of LED 2) which starts it working.
The fan motor is thus switched on (LED
3) to carry out the preventilation of the
combustion chamber, at the same time
the air damper control servo motor mo-
ves to the opening position correspon-
ding to the maximum regulated power.
At the end of the preventilation stage
the air damper has to be returned to the
ignition flame position. If the pressure
control switch for the ventilation air de-
tects sufficient pressure, the ignition
transformer goes on (LED 4) and, after
two seconds, the main gas and safety
valves open (LED 5)
Note that:
a) The main valve has a device for the
proportional adjustment of the air to
gas ratio.
b) The safety valve is an ON/OFF
type.
c) The air damper is activated by
an electric servo
0002933220 to 200Lx at 390Lx and
0002933490 for 540Lx), remember
that when the burner is stopped by
the thermostat, the gate damper
is brought back by the servo motor
to its closed position.
Note:
The gas supply at the ignition flame
position must generally be greater than
the minimum modulation capacity. The
ignition flame position can be adju-
sted with the air damper control servo
motor. (see 0002933220 to 200Lx at
390Lx and 0002933490 for 540Lx).
The presence of the flame, detected
by the control device itself, permits the
continuance and completion of the igni-
tion stage with the switching off of the
ignition transformer. Subsequently the
servo motor progressively opens the
air damper and the pneumatic valve
allows the gas supply to increase to its
set maximum.
Control box or Safety
programmer time
s
LFL 1.333 3
5
1 Main ON-OFF switch
2 Live voltage light
3 Fan working light
4 Transformer on light
If there is no flame, the control box
stops in its "safety lock-out" (LED 7)
within 3 seconds from the opening of
motor (see
the main valve. In the case of safety
lock-out the valves immediately close
again. To release the control box from
its safety position press button 8 on the
display panel.
D E S C R I P T I O N
MODULATION WORKING
When the burner is running at mini-
mum capacity, if the modulation probe
allows, (adjusted to a temperature or
pressure value greater than that in the
boiler) the air adjustment servo motor
starts to turn causing gradual increase
in combustion air supply and, conse-
quently also of gas, up to the maximum
supply for which the burner has been
set. The increase in the fan air pressure
is detected by the proportional gas val-
ve sensor which gradually adjusts gas
supply to the change in air pressure.
The burner stays at maximum delivery
until the temperature or pressure rea-
ches a level high enough to cause the
Preventilation Pre- Post-
time ignition ignition
s s
31,5 6
2
4
3
1
6
O F
Time between opening
of pilot valves and
opening of main valves
s s
3 12
46 / 119
0006081062_200709
7
8
5 Gas valves working indicator light
6 Safety fuses
7 Control box lock-out light
8 Control box release button
modulation probe to turn the air adju-
stment servo motor in the opposite di-
rection.
The backward rotation and consequent
reduction in gas and air supply happens
at brief time intervals. With this manoe-
uvre the modulation system seeks to
balance the quantity of heat supplied
to the boiler with that which the boiler
itself provides. The modulation probe
applied to the boiler detects changes
in demand and automatically adjusts
the supply of fuel and of combustion
air, switching on the servo motor with
an increased or decreased rotation. If,
even with fuel supply at minimum, the
limit value is reached (temperature or
pressure) for which the device is set for
complete stop, (through thermostat or
pressure switch) the burner is stopped
by the device.
By lowering the temperature or pressu-
re again below the burner stop device-
triggering figure it is switched on again
in accordance with the program descri-
bed in the previous paragraph.
Cut out of pilot flame Time between opening
after opening of 1st flame valve
main valves and 2nd flame valve
s
3
s
12