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Commissioning
Fuel-air compound control
Fuel-air compound control
This compound pneumatic control
system with precision-adjustment
capability has been designed to allow
the fuel and air flow rates to be steadily
varied in sliding mode for an adjustment
of the fuel-air ratio over the whole control
range. The infinitely variable control
increases or decreases output to any
point within the control range suitable for
the current heat requirement.
Electronic compound control
The air flap, the gas flap and the oil
regulating valve in the return are each
fitted with a servomotor that controls the
position of these servo components. At
the factory, the air curve of the
compound controller is configured in
such a way that the air flap is closed at
the minimum setting and open at the
maximum setting.
As part of burner commissioning, the
servo components for the fuel and air
are assigned permanently defined
positions in relation to burner
output. During burner operation, the
servo components move into these
positions with great accuracy. This
precision is a fundamental prerequisite
for permanently ensuring low-emission
combustion. The gas pressure should
be corrected at the gas pressure
regulator if necessary.
Gas
Oil (supply)
Oil (return)
Air
Please note:
The gas outlet pressure (gas regulating
pressure) must always be less than the
gas inlet pressure but higher than the
total pressure loss of the system.
Proceed in accordance with the
commissioning instructions for the
electronic compound control system
when making gradual adjustments to
the load points (fuel flow rate, air flow
rate).
Where possible, a combustion
measurement should be carried out at
each point.
Equipment option: speed control
The burners can be equipped with a
speed controller as an option. During
long burner operating periods in the
partial load range in particular, the
reduction in blower speed helps to
conserve electrical energy and reduce
noise emissions from the burner blower
itself. The speed of the blower is
measured by a Namur sensor and
controlled to the programmed reference
value for the current output level.
03/2016 - Art. Nr. 4200 1044 8002A
Equipment option:
O
control / CO control
2
To improve the efficiency of the system,
the combustion manager can be
equipped with residual oxygen or CO
control (CO control available only with
the use of a Lamtec burner controller).
The residual oxygen is measured in the
flue gas of the heating system by an O
measuring probe with zirconium oxide
sensor and sent to the combustion
manager as a correction factor. Thanks
to O
control, it is possible to eliminate
2
variations in ambient conditions (e.g.
combustion air temperature and
humidity, calorific value fluctuations,
etc.) and significantly reduce the air
surplus required for calibration.
Reference value deviations are
controlled by corrections to the blower
speed or the position. With the use of
CO control (only possible with gas
operation), the CO content is measured
in addition to the residual oxygen. The
air surplus is reduced to the "CO edge"
by a correction to the blower speed or
the air flap position. The correction
factors are determined in a system-
specific "learning process" and stored
temporarily in the combustion manager.
This makes it possible to maximise the
system's heating efficiency across the
entire output range and optimally
manage the combustion process. For
further information, please refer to the
manufacturer's documentation for the
electronic combustion manager.
1a
Gas control damper with
servomotor
1b
Oil control valve with servomotor
1c
Air control dampers with
servomotor
2
Burner
3
Boiler
4
Combustion air fan
2
51
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