Inspection Of Burner Electrodes; Replacing Components; Removing The Gas Valve - Buderus Logano plus GB402 Installation And Maintenance Instructions Manual

9 Inspection and maintenance
9.7

Inspection of Burner electrodes

Checking the electrode position
▶ Move the burner into its service position ( Chapter 9.6, page 32).
▶ Check the gaps between the electrodes and compare them with those
shown in Fig. 55.
Fig. 55 Setting the electrode position
[1] Gasket (O-ring), mixture manifold
[2] Fixing screws, burner rod
[3] Ignition electrode
[4] Burner rod
[5] Ionisation electrode
▶ Replace the electrode block together with a new gasket if actual
values deviate from the specified parameters.
▶ If deposits are found on the electrodes, replace the electrode block
together with a new gasket or sand down the electrodes.
We recommend the replacement of the electrode block
as part of the annual service.
36
9.8

Replacing components

9.8.1 Removing the gas valve

▶ Shut down the heating system ( Chapter 7, page 21).
▶ Close the main gas shut-off valve and secure against unintentional re-
opening.
▶ Pull compensation hose [1] from the ventilation air collector.
▶ Undo the ventilation air hose between the ventilation air collector and
adaptor at the hose clip.
▶ Remove the ventilation air hose together with the connector from the
ventilation air collector.
▶ Undo cables [3] from the gas valve.
▶ Undo 4 screws [2] from the gas valve flange.
Fig. 56 Undoing the gas valve connections
[1] Compensation hose
[2] Screws
[3] Cables
▶ Remove 3 nuts [2] from the nozzle plate and remove gas valve [1].
Fig. 57 Undoing the gas valve
[1] Gas train
[2] Nut
Logano plus GB402 – 6 720 804 428 (2012/09)