Checking And Adjusting The Ignition And Ionisation Electrodes; Cleaning The Heat Exchanger And Fitting The Burner - Viessmann FB2B Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
1. Remove electrodes B.
2. Undo three retaining clips C at ther-
mal insulation ring D and remove
thermal insulation ring D.
3. Undo four Torx screws and remove
burner gauze assembly E with its
gasket F.

Checking and adjusting the ignition and ionisation electrodes

6
+2
0
A
A Ignition electrodes
1. Check the electrodes for wear and
contamination.
2. Clean the electrodes with a small
brush (not with a wire brush) or sand
paper.

Cleaning the heat exchanger and fitting the burner

!
Please note
Scratches on parts that are in contact with flue gas can lead to corrosion.
Never use brushes to clean the heat exchanger.
40
4. Insert and secure a new burner
gauze assembly E with a new gas-
ket F.
Torque: 3.5 Nm.
5. Refit thermal insulation ring D.
6. Refit electrodes B.
Torque: 4.5 Nm.
A
B Ionisation electrode
3. Check the electrode gaps. If the gaps
are not as specified or the electrodes
are damaged, replace and align the
electrodes together with new gas-
kets. Tighten the electrode fixing
screws with 4.5 Nm torque.
(cont.)
10
±1
B