Unigas C83X Installation Manual page 78

10.6 Main parameter of the FGR function
Parameter
DelaytimeFGR Gas
Setting of delay time for auxiliary actuator 3 to be kept in the ignition position after entering phase
OPERATION
DelaytimeFGR Oil
ThresholdFGR Gas
Setting of temperature that must not be exceeded so that auxiliary actuator 3 can be kept in the
ignition position
ThresholdFGR Oil
FGR-sensor
(X86 PtNi1000 /
Selection of temperature sensors for temperature-compensated flue gas recirculation (FGR)
X60 Pt1000 /
X60 Ni1000)
Readjustment of calculated temperature-dependent position of auxiliary actuator 3.
The setting is made in steps of 1%.
100% means no readjustment.
Settings <100% reduce the amount of recirculate flue gas (moving the damper toward the fully
Factor FGR Gas
closed position).
The factor has an impact only when there is a deviation from the learned flue gas recirculation
Factor FGR Oil
(FGR) temperature.
This means that when reaching the initially acquired flue gas recirculation (FGR) temperature,
the stored position is approached, independent of the flue gas recirculation (FGR) factor.
See the Examples of tables showing the damper positions with FGR
Minimum limitation of position of auxiliary actuator 3 for temp.comp. and TCautoDeact modes.
The setting is made as an absolute value and ensures that flue gas recirculation (FGR) always
operates with at least a minimum amount of flue gas.
FGR MinPos
The position is also used to ensure a defined damper position for emergency operation or
automatically deactivated flue gas recirculation (FGR)
Maximum limitation of the required position of auxiliary actuator 3 calculated from the current
temperature and the warm position.
FGR MaxPos Fact
The setting is made in steps of 1% and refers to the relevant curve-point.
Interpolation between the curve-points is linear
The parameter are in side the AZL menu with following structure:
1st level 2nd level
Param & Display
Flue Gas Recirc
WARNING: Only in case of FGR temperature compensation function.
If the detected temperature value is lower than the value recorded during the curve setting, the AUX3 servomotor doesn't reach
the set position, but it will be closer. In this condition flue gas recirculation flow could be not sufficient or too much.
NOx value could be different from the expected or the flame could be instable. Try to reduce the correction factor ("Factor FGR
Gas" or "Factor FGR Oil"). In case readjust the FGR curve. Probably the point was saved also if the flue gas temperature were
too far from the regime condition.
3rd level 4th level
X60 Pt1000
FGR-sensor
X60 Ni1000
ThresholdFGR Gas
0...850 °C
ThresholdFGR Oil
DelaytimeFGR Gas
0...63 min
DelaytimeFGR Oil
Factor FGR Gas
10..100%
Factor FGR Oil
FGR MinPos
FGR MaxPos Fact 0..100%
Description
5th level 6th level
34
LMV50
LMV51.3
LMV52.2
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Description
According to the available probe
According to the regulation needs
According to the regulation needs
According to the regulation needs
According to the regulation needs
According to the regulation needs
LMV52.4..
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