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Carry out controlled start
Open control circuit.
• Valve proving is carried out.
Close control circuit and monitor start behaviour of burner
• Burner start.
• Ignition load is started.
• Following flame formation servomotor drives to partial
load or full load.
Correcting measures with poor start behaviour:
• Reduce mixing pressure by turning the setting screw of
the diffuser to the left (increase distance diffuser -
combustion head front edge).
• With poor flame formation (observe ionisation current)
increase gas quantity at the ignition load limit switch
(ZL).
• With start up impact reduce gas quantity at ignition
load limit switch (ZL).
Note If further changes of the gas setting pressure
or the diffuser setting are required, the whole
burner setting (including pre-setting) has to be
repeated.
Measuring ionisation current
If a flame is present, an ionisation current flows.
Response sensitivity of the flame sensor: __________ 1 µA
Minimum recommended ionisation current: ________ 5 µA
Test unit:
Multimeter or micro-ammeter.
Connection:
A meter connection plug is provided in the ionisation
cable.
Measuring ionisation current
Setting the gas pressure switch
Factory pre-setting: 12 mbar
The switch point must be checked and adjusted during
commissioning
1. Connect a manometer at the test point between V1
and V2 of the W-MF.
2. Remove protective cap of the gas pressure switch.
3. Start the burner (full load).
4. Slowly close the ball valve until the gas pressure drops
to half the value, monitoring CO value and flame
stability.
5. Turn setting cam to the right, until the combustion
manager starts the low gas pressure program.
Minimum value: 12 mbar.
6. Open ball valve.
7. Press reset-button to interrupt the low gas pressure
program.
Burner must start without low gas pressure program.
Gas pressure switch
Test point
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