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▶ Take off the burner.
Fig. 82 Removing the burner
▶ Check the burner and gas distributor plate for soiling and cracking.
▶ Clean the burner with compressed air or a soft brush if necessary.
▶ Avoid touching the burner surface.
11.4
Cleaning the heat exchanger
NOTICE: Damage to the boiler.
▶ The heat exchanger has been coated. This coating
must not be damaged.
▶ Steel brushes, abrasives or similar must therefore
not be used when cleaning the various components.
▶ Cover the ignition device.
▶ Clean the heat exchanger by flushing with water or blowing through
compressed air.
▶ Rinse the heat exchanger with water if necessary.
Fig. 83 Cleaning the heat exchanger
6720814332 (2018/04)
1.
2.
6 720 807 034-040.1DDC
6 720 641 177-007.2DDC
11.5
Checking the ignition system
NOTICE: Damage to the glow ignitor.
The glow ignitor unit is made of breakable material.
▶ Handle with care.
NOTICE: Damage to the boiler.
Since the effectiveness of the gaskets in the ignition
device is reduced, the boiler may be damaged.
▶ Replace the gasket ( figure 85, [3]) and cover
plate with gasket ( figure 85, [4]) every 4 years.
▶ Check the ignition device for wear, damage and soiling.
Fig. 84 Checking the monitoring electrode
▶ When replacing the monitoring electrode or glow ignitor unit, fit a
new cover plate with gasket [4] and gasket [3].
1
Fig. 85 Replacing the ignition device
[1]
Glow ignitor
[2]
Flame sense electrode
[3]
Seal
[4]
Cover plate with gasket
[5]
Nut
▶ Insert the burner [1] with the notch pointing to the right [3].
Inspection and servicing
7 746 800 040-128.2TD
2
3
4
5
5
6 720 803 968-054.2TD
39
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