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Building Technologies Basic Documentation LMV5... CC1P7550en
20 Flue gas recirculation (FGR) function (LMV50/LMV51.3/LMV52) 22.05.2018
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Note!
The valuation of the input Oil pressure switch-min in the program Heavy oil with gas
pilot has been moved from phase 38 to phase 44.
To subsequently change this assignment, 2 choices are available:
1. Without DriveLowfire in operation.
When selecting without DriveLowfire in operation, the initial temperature value is
not changed.
In that case, the flue gas recirculation (FGR) position should be slightly changed
to compensate for dynamic effects, for example.
The effects must be verified via manual operation outside of the curve setting!
2. Curve setting in standby (deactivation of an individual curvepoint of flue gas
recirculation (FGR)).
When changing a curvepoint in standby, the LMV5 stores an invalid flue gas
recirculation (FGR) temperature (XXXX when reading the temperature values) in
the temperature curve.
This approach can be used to subsequently exclude a curvepoint from the flue
gas recirculation (FGR) process.
In that case, the flue gas recirculation (FGR) actuator is operated at the respective
output with a damper position as much as possible closed.
Caution!
A subsequent change of the curvepoint without an associated flue gas
recirculation (FGR) temperature (e.g. without DriveLowfire in operation or
standby) leads to an incorrect pairing of 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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