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Building Technologies Basic Documentation LMV5... CC1P7550en
20 Flue gas recirculation (FGR) function (LMV50/LMV51.3/LMV52) 22.05.2018
20.3.3 Settings in deactMinpos or auto deact mode (only
LMV52.4) :
In flue gas recirculation (FGR) mode deactMinpos or auto deact, the flue gas
temperature sensor is not evaluated and the value used internally for the flue gas
temperature is always maintained at 0 °C.
As a result, the display that appears for auxiliary actuator 3 while the curve setting is
made is XXXX.
While storing the curvepoint, an invalid value is entered in the temperature curve
(corresponding to presetting or temperature curve deleted).
In flue gas recirculation mode deactMinpos or auto deact , auxiliary actuator 3 is always
kept in the minimal flue gas recirculation position.
During the time the curve settings are made, this is indicated by the # symbol, meaning
modulating.
F G R - T I L o a d : 2 3 . 5
1 3 3 I F u e l : 2 3 . 2
O 2 I A i r : 4 1 . 6
2 . 8 I A u x 3 : 3 3 . 3
Β
Note!
Recommendation:
Commission the plant with temperature-compensated flue gas recirculation (FGR) in
deactMinpos mode.
This means that auxiliary actuator 3 is always kept in the minimal flue gas recirculation
position during curve setting.
As a result, the initial settings of the fuel-air ratio control system can be made without
getting any influence from flue gas recirculation (FGR).
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