Electrical Connections; General Information; Control Box Specifications - baltur GI 350 DSPGN Instrucciones

ELECTRICAL CONNECTIONS

The three-phase or single-phase electric supply line of the minimum section, in proportion to the power absorbed
by the burner, must be equipped with a fused switch. Furthermore, regulations require a switch on the burner's
feed line which should be located outside the boiler room in an easily accessible position.
All electric lines must be protected by flexible sheaths, be firmly secured and be laid a long way from high tempe-
rature parts. For the electrical connections (line and thermostat) see the relevant diagram.

GENERAL INFORMATION

These burners are of the blown air type which have a mixture of gas/air at the combustion head.
They are suitable for use with combustion chambers which are either raising high pressure or reducing pressure,
according to the relative work curves. Together with excellent flame stability, these burners are safe and highly
efficient. It is equipped with a steel flange which slips on the burner head.
DESCRIPTION OF OPERATION FOR 2-STAGE PROGRESSIVE OPERATION
0002906)
This is referred to as a 2-stage progressive operation because the passage from the 
Safety time
Control box &
relative in seconds
programmer
LFL .333
Cyclic relay
(from the minimum rate to the maximum pre-established rate) takes place gradually.
The amount of combustion air and fuel delivery are increased very gradually and this ensure stabilization of the
gas feed network pressure. The field of variation in flow obtainable is from 1 to 1/3. The burner is fitted with an
end-of-the-run switch (a micro-switch) which stops the burner starting up if the flow regulator is not in the minimum
position. Before ignition, a pre-ventilation of the combustion chamber occurs (according to Regulations) with air
open. At the end of the ventilation phase, if the air ventilation pressure switch has measured sufficient pressure,
the ignition transformer will be connected and the ignition (pilot) valves and the safety valve will open.
Gas reaches the combustion head, mixes with air supplied by the fan, and is ignited. Delivery is regulated by the
flow regulator incorporated in the ignition flame (pilot) valve. The ignition transformer is disconnected after the
ignition flame and safety valves are inserted. The burner is now operating with the ignition flame (pilot) only.
Flame presence is detected by a relative control device (ionization probe immersed in the flame, or UV cell).
The relay programmer passes the "shut down" position and gives voltage to the servomotor which regulates the de-
livery (gas/air); the burner is now operating at minimum output. If the boiler thermostat (or pressure switch) of the 2
stage allows it (regulated at a temperature or pressure value superior to that existing in the boiler), the servomotor
which regulates the gas/air delivery starts turning and determines a gradual increase in the gas delivery and in the
relative combustion air until it reaches the maximum delivery value at which the burner has been regulated.
N.B. The "V" cam of the servomotor regulating air/gas delivery (see BT 8562/1) inserts almost immediately the
principle gas valve, which in turn opens completely. Gas delivery is not determined by the principle valve
but by the position of the gas delivery regulation valve (see BT 8815).
The burner remains in the maximum delivery position until the temperature or pressure reaches the limit set for
the intervention of the boiler thermostat (or pressure switch) of the 2
ting gas/air delivery rotate in the opposite sense of direction. Thus gas delivery and the relative combustion air
are gradually reduced until they reach minimum value. Even with delivery at a minimum, if the limit (temperature
or pressure) at which the shut down device (thermostat or pressure switch) has been regulated is reached, the
burner will be brought to a standstill. When the temperature or pressure drops below the intervention limit set on
the shut down device, the burner will start up again, according to the programme previously described.
During normal operations, the boiler thermostat/pressure switch of the 2
variations requested and automatically proceeds with adapting the fuel and combustion air delivery by inserting
the servomotor which regulates delivery (gas-air). This will rotate in such a way as to obtain an increase or a de-
crease. With this manoeuvre, the gas/air delivery regulating system try to equilibrate the quantity of heat supplied
to the boiler with that which the boiler gives to be utilized. If the flame does not appear the control box goes to
"shut down" (the burner stops completely and the relative indicator light is turned on). To unblock the control box,

CONTROL BOX SPECIFICATIONS

Pre-ventilation
time with shutter
open in seconds
3 3,5
000608006_2007/06
Pre-ignition Post-ignition
in seconds in seconds
6 3
stage and makes the servomotor regula-
nd
stage fitted to the boiler detects the
nd
42 / 
(see N°
flame to the 2 flame
st nd
Time between 1st flame
& modulation start
in second
2
nd