Changing curve settings may have an impact on the combustion
settings. Check the servomotors regulating fuel and air. Readjust if
needed.
You can save changes to the operating and display unit memory. Answer
yes
to the
screen message that appears when leaving
Params. & Display
menu level.
For more detailed instructions on setting, monitoring, and editing curve points, see
section
Setting ratio curve
.
4.18 Measuring FGR
FGR principle monoblock ver. 3
Pos.
Item
1
FGR duct
2
FGR control valve
3
Measuring point of residual oxygen in
flue gas
Recirculated flue gas amount is typically 5–20 % of the flue gas/combustion air mixture
amount, depending on the application. Flue gas percentage is counted as follows:
FGR % = Flue gas amount recirculated ppm / (Flue gas amount recirculated ppm +
combustion air amount in ppm) %
To define flue gas percentage
1. First measure the amount of O
2
in the flue gas/combustion air mixture. The optimal
measuring point is the burner wind box.
2. Measure the residual O
2
in flue gas.
3. Read the FGR percentage value in the diagram below.
60 (111)
M4219 2305EN
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