FGR may cause unstable combustion. To avoid noise, vibration or other disturbance,
the settings must always be defined for each burner separately.
4.20 Capacity range
Burner capacity range can be set as required at service level. The minimum capacity
can be larger than the first curve point, and the maximum capacity can be below the
last curve point. During start-up, the burner runs from ignition capacity to minimum
capacity, and continues to normal operation. Ignition capacity can be smaller or larger
than the first curve point capacity, or it can be the same.
Set minimum and maximum capacity for each fuel individually from menu as follows:
Description
Params. &
Display
RatioControl
GasSettings
LoadLimits
MinLoadGas.
Minimum load
"Low fire" (gas)
MaxLoadGas
Maximum load
"High fire" (gas)
On user level, maximum load can be set individually as follows:
Description
Operation
User Maxload
User MaxLoadMod
Maximum load on
modulating burner
4.21 O
2
min. value control (WD200)
O
2
ratio control can be set after setting the ratio curve.
Ratio curve air amount should be approx. 1% higher than O
2
ratio
control, so that environmental changes do not set residual oxygen level
below O
2
trim control level.
Ratio curve should be as smooth as possible. If the curve has sharp breakpoints, set
one additional point to smooth the curve. Even ratio curve improves O
2
ratio control.
In dual-fuel burners, set the O
2
ratio control individually for both fuels, and they are not
correlating.
Start O
2
ratio curve by setting O
2
min. value control.
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M4263 2206EN
