OPERATING DESCRIPTION
The gas train supplied with the burner is composed of an ON/OFF
safety valve and a single stage slow opening main valve.
The gas flow adjustment 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 damper (8) is caused by the rotation of the
servomotor (7) through the lever and tie rod system (34). For the
adjustment of the air damper position according to the burner power
in the first and second stage, consult section: "IGNITION AND REGU
-
LATION". If when the main switch is turned on (1), the thermostats are
on, the voltage reaches the control box which starts the burner (2).
This turns on the fan motor (3) for pre-ventilating the combustion
chamber. At the same time the command servomotor (7) rotates, brin
-
ging the gas throttle (6) and the air damper (8), by means of a lever
system, to the opening position corresponding to the second flame.
At the end of the pre-ventilation phase, the gas throttle and the air
damper are returned to the first flame position, then the ignition tran
-
sformer (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 progres
-
sive opening of the gas throttle and the air damper at the same time.
At the moment in which the demand for heat from the system is sa
-
tisfied, the boiler thermostat will intervene and shut down the boiler.
The air damper, 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 se
-
conds of the opening of the main gas valve. In “safety lock-out” mode
the valves are immediately closed again. To release the equipment
from its safety position, press the reset button (9).
MODULATION OPERATION DESCRIPTION
When the burner is on at minimum flow rate, if the modulation probe
requires it (set to a temperature or pressure value higher than that in
the boiler) the air/gas regulation servomotor starts turning;
•
in a clockwise direction the air flow increases;
•
anticlockwise rotation: the air flow decreases.
Thus gradually increasing gas supply and combustion air until the
maximum supply level set for the burner is reached.
1 Main on/off switch
2 Thermostat on indicator light
3 Fan motor indicator light
4 Ignition transformer indicator light
5 Gas valves' indicator light
9 Lock button
10 Reset button
MotReg_
002
7
6
8
34
ENGLISH
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0006160254_202001
Summary of Contents for TBG 80 LX MC
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Page 34: ...SCHEMI ELETTRICI ITALIANO 32 34 0006160254_202001...
Page 36: ...ITALIANO 34 34 0006160254_202001...
Page 68: ...WIRING DIAGRAMS ENGLISH 32 34 0006160254_202001...
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