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Fig. 68 Electrode position (dimension in mm)
[1]
Ignition electrode
[2]
Monitoring 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 to remove
the deposits.
We recommend replacing the electrode block as part of annual
maintenance.
If a part needs to be replaced:
▶ Observe information in Chapter 11.11.4, page 48.
▶ To complete the maintenance, observe Chapter 11.12, page 49
11.10 Testing the differential pressure switch
The differential pressure switch must be checked to ensure it is working
correctly each time maintenance or an inspection is carried out
(Chapter 16, page 65).
11.11 Replacing components
NOTICE
Malfunctions due to incorrectly connected or unconnected hose
lines!
If the wrong hose lines are used or if they are incorrectly connected, this
leads to unhygienic combustion.
▶ Connect the hose lines as shown in the connection diagram
(Chapterl 17.4.3, page 71).
▶ Make sure the hose lines are not buckled or trapped.
Condens 7000 FP – 6721846699 (2022/12)
11.11.1 Removing the air/gas ratio control valve
Observe replacement interval of the air/gas ratio control valve.
▶ Replace air/gas ratio control valve depending on the service life
according to Tab. 14, page 49.
1
The valve testing system is set to 5 mbar at the factory.
▶ Shut down the heating system ( Chapter 9.1, page 33).
▶ Close the main gas shut-off valve or gas isolator and secure against
unintentional re-opening.
▶ Move the burner into its service position (Chapter 9.1, page 33).
▶ Remove 3 nuts [2] from the nozzle plate and remove air/gas ratio
2
control valve [1].
0010012530-002
Fig. 69 Unscrewing the air/gas ratio control valve
[1]
Air/gas ratio control valve
[2]
Nut (3x)
▶ Remove the test cables.
▶ When installing a new air/gas ratio control valve, first connect the
"test line for gas outlet pressure" and the "compensation line"
correctly to the new air/gas ratio control valve (Chapter 11.2,
page 35).
Tightening torque of the nuts: 15 Nm.
▶ To complete the maintenance: Chapter 11.12, page 49)
11.11.2 Changing the gas filter
▶ Shut down the heating system (Chapter 9.1, page 33).
▶ Close the main gas shut-off valve or gas isolator and secure against
unintentional re-opening.
▶ Remove the front panel (Chapter 11.1, page 34).
▶ Undo both screws [4] on the filter cover [3] underneath the air/gas
ratio control valve.
▶ Remove filter cassette [1] and insert a new one.
Inspection and maintenance
1
2
0010019234-002
47
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