baltur 17830010, Installation, Use And Maintenance Instruction Manual

Page: 52 / 72

ENGLISH
16 / 34
0006160250_201803
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 REGULATION". 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,
bringing 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
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
progressive 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
satisfied, 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 seconds 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).
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
TWO STAGE GAS BURNER
When the two-stage burner is installed on a boiler for the production
of hot water for heating purposes, it must be connected so it can
operate at the maximum output by stopping completely, without
switching to the first-stage operation, when the set temperature
is reached.
If the burner has switched to the first-stage operation, the boiler
would be loaded insufficiently and so flue gas would come out at
a temperature below the dew point giving rise to the presence of
condensation water in the flue.
To obtain this particular operation, do not install the second stage
thermostat but make a direct connection between the terminals of
the 4-pole connector (jumper).