Installation and operating instruction
Combustion manager W-FM 100 und W-FM 200
7 Commissioning
83054802 1/2018-07 La
184-228
7.4.3 Check and optimise O2 trim
1. Bridge load control
In order to monitor the O2 value via display and operating unit, the load must be in-
fluenced manually via an external signal (e.g. 3 pole switch at input X5-03).
It is preferential to monitor O2 trim with software ACS450.
Switch off burner and isolate W-FM from voltage supply.
Connect 3 pole switch to input X5-03.
Switch on voltage supply.
Set load controller operating mode to ExtLC X5-03, see [ch.6.12.2].
Use [esc] to return to the display LoadController.
2. Set operating mode
Select O2 Contr/Alarm.
Select current fuel GasSettings or OilSettings.
Select OptgMode.
Set conAutoDeac using the dial knob and confirm with [ENTER].
Use [esc] to return to the display Param & Display.
3. Set burner to automatic operation
Select ManualOperation.
Select Autom/Manual/Off.
Set Automatic using dial knob and confirm with [ENTER].
Use [esc] to return to the display Autom/Manual/Off.
Use [info] to return to OperationalStat.
Select NormalOperation.
4. Check O2 trim
Close control circuit and drive to full load via 3 pole switch.
Check control behaviour whilst monitoring O2 value in the display and operating
unit.
The burner drives on the compound curves to full load.
Once the O2 sensor has reached operating temperature and the blocking time
has elapsed, the W-FM goes to pre-control [ch.6.10].
Only the air influencing actuators are operating, the fuel actuator remains in its
position and the O2 actual value approaches the O2 setpoint.
If O2 setpoint is not reached via the pre-control, O2 trim reacts and controls the
O2 actual value.
Change load using the 3 pole switch.
O2 trim is suspended and the burner drives to the new load.
Pre-control is activated and the compound almost maintains the O2 setpoint.
If no changes were made to the load before the blocking time has elapsed, O2
trim is activated and controls the O2 actual value.
Drive through the entire load range and monitor the control behaviour.
If necessary, optimise O2 trim via the settings in menu ControlParam, see
[ch.6.10.4].