Methane Lighting And Regulation - baltur GI 500 DSPGN ME Manual De Instrucciones

DESCRIPTION OF PROGRESSIVE TWO-STAGE
OPERATION
Blown air burners with electronic modulation may be used on
hearths under strong pressure or in a depression, according to the
corresponding operating curves. They combine a very stable flame
with total safety and high yield. The MPA 22 electronic cam on the
burner is microprocessor controlled for intermittent operation, for
commanding and supervising blower gas burners with electronic
modulation with two regulation motors: one for air and one for gas.
The instruction manual for the MPA 22 electronic cam supplied
with the burner (code 0006080905) also provides instructions for
operating the seal control on the valves.
The term two-stage progressive operation means that tran-
sition from the first to the second state (from minimum to
maximum operation) is progressive in terms of both amount
of comburent air let in and the amount of fuel, offering signi-
ficant benefits for the stability of the gas supply pressure.
The range of variation of flow rate is approximately 1 to 1/5. Ignition
is preceeded by preventilation of the combustion chamber with
the air open for about 36 seconds. At the end of the preventilation
phase, if the air control pressure switch has found that pressure is
sufficient, the ignition transformer will come on, and three seconds
later the safety and main valves will open, in order. Gas reaches the
combustion head, mixes with air supplied by the fan and is ignited.
The gas supply is regulated by the butterfly gas valve. Three seconds
after the valves (main and safety) come on, the ignition transformer
goes off. Thus the burner is ignited at the ignition point (P0). The
presence of the flame is detected by the control device (ionization
probe immersed in the flame). The programmer relay moves past the
locking position and sends voltage to the air/gas supply regulation
servomotors, which go to the minimum point (P1). If the stage 2 boiler
thermostat (or pressure switch) consents (set to a temperature or
pressure value higher than the existing value in the boiler), the air/
gas supply servomotors will start to turn, gradually increasing gas
and combustion air supplies up to the maximum levels to which the
burner is set (pointP9).
The MPA 22 electronic cam commands the burner, working
!
the comburent air and gas servomotor on the basis of a
preset curve.
The burner remains in the maximum position until temperature or
pressure reach a sufficient value to cause the stage 2 boiler ther-
mostat (or pressure switch) to trip, which makes the air/gas supply
servomotors turn in the opposite direction to the previous one,
gradually reducing gas and comburent air supply to the minimum
value.
If the threshold value (temperature or pressure) to which the
complete shutdown device (thermostat or pressure switch) is set
is reached even with minimum gas and air supplies, the burner will
be shut down when it is triggered.
As temperature or pressure drops below the shutdown device's
setpoint, the burner will be turned on again as described above.
During regular operation the stage 2 boiler thermostat (or pressure
switch) applied to the boiler detects variations in demand and
automatically adapts fuel and comburent air supplies, increasing
or decreasing the rotation of the air/gas supply servomotors. This
causes the air/gas supply control system to balance the amount of
heat supplied to the boiler with the amount it gives off during use.
If a flame does not appear within three seconds from the opening of
the gas valvea, the control apparatus will shut down (shutting down
the boiler completely, turning on the indicator light and showing error
message 25H on the display).
To "release" the apparatus, press the disturbance elimination button
(4) for about half a second.

METHANE LIGHTING AND REGULATION

1) It is essential to bleed air out of the pipes, if this has not already
been done when connecting the burner to the gas pipe, taking all
necessary precautions and leaving all doors and windows open.
Open the union on the pipe near the burner and then open the
gas on/off cocks a little way. When you smell gas, close the
cock. Wait long enough for the gas in the room to disperse,
depending on local conditions, then connect the burner to the
gas pipe again. Open the cock.
2) Check that there is water in the boiler and that the gate valves
on the system are open.
3) Make absolutely sure that the products of combustion can be
released freely (boiler gate valve and stack open).
4) Check that the voltage of the electrical grid to which the appa-
ratus is to be connected is appropriate for the burner and that
the electrical wiring (engine or main line) is appropriate for the
available voltage. Also check that all electrical connections
made on-site are performed correctly as shown in our wiring
diagram.
5) Make sure that the combustion head is long enough to penetrate
the hearth by the amount specified by the boiler manufacturer .
Check that the air regulation device on the combustion head is
in the appropriate position for supplying the required amount of
fuel (the passage of air between the disk and the head must be
closed off significantly if a small amount of fuel is supplied, and
opened up if the fuel supply is abundant). Refer to the chapter
on "Air regulation on the combustion head".
6) Apply a pressure gauge of appropriate scale (if the amount
of pressure to be used permits, it is preferable to use a water
column instrument; do not use instruments with indicator hands
for low pressures) to the pressure intake on the gas pressure
switch.
7) With the "1" switch on the control panel switched to "O" and the
master switch turned on, manually close the remote control and
check that the motor revolves in the correct direction. If neces-
sary, exchange the position of the two cables in the line that
feeds the motor in order to invert the direction of revolution.
8) Now turn on the switch on the control panel. This turns on the
voltage to the control device, and the programmer will turn on
the burner as described in the chapter entitled "Description of
functioning". For burner adjustment, refer to the instructions
for the "MPA 22" electronic cam in the attached manual, code
0006080905.
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