LoadLimits
MinLoadGas.
Minimum load
"Low fire" (gas)
MaxLoadGas
Maximum load
"High fire" (gas)
At the user level, maximum load can be set individually as follows:
Description
Operation
User Maxload
User MaxLoadMod
Maximum load on
modulating burner
4.20 O2 min. value control (WD200)
O2 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 O2 ratio control.
In dual-fuel burners, set the O2 ratio control individually for both fuels, and they are not
correlating.
Start O2 ratio curve by setting O2 min. value control.
O2 min. value control
When setting for the first time
O2 monitor
should be deactivated with
man deact
.
Params. & Display
O2Contr/Guard
FuelSettings
OptgMode
man deact
Set O2 min. value control as low as possible to ensure a high availability. O2 min. value
is between the permanently non-hazardous range and the potentially hazardous range.
O2 ratio curve is set at lowest 0.5 %–1 % above O2 min. value, so during normal
burner operation this level should not be reached.
Hazardous conditions must not permanently occur above or at O2 min.
value.
M4248 2316EN
65 (114)
