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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 performance.
The burner is equipped with a LAMTEC electronic cam model “BT
3xx” controlled by a microprocessor with intermittent operation, to
control and monitor blower gas burners with electronic modulation
by means of two regulating motors (air/gas). During operation as
automatic burner, a valve tightness control is also incorporated. To
better understand the operation of the “BT 3xx” electronic cam, read
carefully the instructions in the attached manual.
The term two-stage progressive operation means that transition
from the first to the second stage flame (from minimum to
maximum operation) is progressive in terms of both amount of
combustive air supply and the amount of fuel, offering significant
benefits for the stability of pressure in the gas supply network. The
capacity variation range that can be reached goes approximately
from 1 to 1/3. Ignition is preceded by the combustion chamber
pre-ventilation (as set forth by the Standards), with air open and
with a duration of approx. 30 seconds. If the air pressure switch
has detected an insufficient pressure, the ignition transformer
activates at the end of the ventilation phase and after 3 seconds
the safety and main valves open in sequence. The gas reaches
the combustion head, mixes with air supplied by the fan and
ignites. The gas supply is regulated by the butterfly gas valve.
Three seconds after the valves (main and safety) activate, the
ignition transformer switches off. Thus the burner is ignited at
the ignition point (
2
). 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 servo motors, which go to
the minimum point (200). If the second stage boiler thermostat (or
pressure switch) allows it (set to a temperature or pressure value
higher than the existing value in the boiler), the air/gas supply servo
motors will start to turn, gradually increasing gas and combustion
air supplies up to the maximum supply to which the burner has
been set (999).
!
The “BT 3xx” electronic cam commands the burner,
activating the combustive air and gas servo motor on
the basis of a pre-set curve.
The burner remains in the maximum supply position until the
temperature or pressure has reached a sufficient value to cause
the second stage boiler thermostat (or pressure switch) to trip,
which makes the air/gas supply regulating servo motors turn in the
opposite direction to the previous one, gradually reducing gas and
combustive air supply to the minimum value.
If the limit value (temperature or pressure) at which the stop device is
set (thermostat or pressure switch) is reached even with gas supply
at minimum level, the burner is shut down by the device.
As temperature or pressure drops below the shut-down device’s
set point, the burner will be turned on again as described above.
During normal operation the second stage boiler thermostat (or
pressure switch) applied to the boiler detects variations in demand
and automatically adapts fuel and combustive air supplies, activating
the air/gas supply adjustment servo motors with increasing or
decreasing rotation. 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 valves, the control equipment will lockout (shutting down the
boiler completely and showing error message 25H on the display (3)).
To “unlock” the equipment, press the RESET button (4) for about
half a second.
2 - Programming keys
3 - Display
4 - Confirm or RESET key
Summary of Contents for btg 15 me
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Page 42: ...18 22 0006081529_201201 ESPA OL ESPA OL...
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Page 107: ...17 22 0006081529_201201 PYCCK 1 2 1 2 1 2 3 1 2 3 1 1 AD PE SS PN 40 40 1 2 3 4 18...
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