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Building Technologies Basic Documentation LMV5... CC1P7550en
20 Flue gas recirculation (FGR) function (LMV50/LMV51.3/LMV52) 22.05.2018
20.3.2 Settings in temperature-compensated mode (only
LMV52.4)
Β
Note!
Recommendation:
First, make the initial settings with no influence from flue gas recirculation (FGR).
This enables the fuel-air ratio control system to be set as if the plant operated without
flue gas recirculation (FGR).
For that purpose, set flue gas recirculation (FGR) mode temp.comp. or TCautoDeact
to deactMinpos.
This way, auxiliary actuator 3 is always maintained at the minimum position of flue gas
recirculation (FGR).
After completing the settings of the fuel-air ratio control curves without flue gas
recirculation (FGR), the actual settings with an active auxiliary actuator 3 can now be
made.
When setting the fuel-air ratio control curves of auxiliary actuator 3 in flue gas
recirculation (FGR) mode temp-compensated, the current flue gas recirculation (FGR)
temperature is also displayed.
Select the required curvepoint, then continue by pressing Enter.
⇒
P o i n t | P o i n t
: 3 | c h a n g e ?
O 2 | d e l e t e ?
2 . 8 I
Here, the cursor position can be changed between change and delete.
The edit a curvepoint, select change.
- Continue by pressing Enter
⇒
Selection whether the actuators shall follow the adjustment.
Caution!
Temperature-compensated flue gas recirculation (FGR) can be correctly set only
when selecting with DriveLowfire in operation!
A change in the curve point without the corresponding flue gas recirculation
temperature (e.g. without driving in operation or in standby) results in an
incorrect pairing of the values Flue gas recirculation position and Flue gas
recirculation temperature.
This can lead to excessive amounts of recirculated flue gas, which might cause
the flame to lift: Stability limit of flame.
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