Removal
1. Close gas ball valve.
2. Isolate burner from electrical supply (see Ch. 4.7).
3. Remove outlet flange from the multifunction assembly
W-MF (see Ch. 4.5)
4. Remove burner body from head flange on the appliance
(see Ch. 4.4).
5. Unplug air damper servomotor
6. Remove screws ➀ and remove air intake housing
7. Remove screws ➁ and remove air regulator housing.
Refitting
Refit following instructions in reverse.
7.9 Removal and refitting gas butterfly valve
Removal and refitting gas butterfly valve
➀ Double nipple with
flange
➁ Crank-arm
➂ Kombi Torx screw
➃ Gas butterfly
➄ Gasket
Risk of explosion!
Uncontrolled gas leakage can lead to an
explosive mixture of gas and air. If ignition
source is present this can lead to an explosion.
Removing
1. Close gas ball valve.
2. Isolate burner from electrical supply.
3. Remove outlet flange ➀ from the multifunction
assembly W-MF (see Ch. 4.5).
4. Remove double nipple.
5. Remove mixing head (see Ch. 7.3).
6. Remove crank-arm ➁.
7. Remove screws ➂.
8. Remove gas butterfly valve ➃.
Refitting
When refitting the mixing head ensure correct
fitting and cleanliness of gasket ➄.
If necessary replace gasket. During
commissioning check soundness with leak
detecting spray.
1. Fit gas butterfly
2. Fit crank-arm ➁.
3. Refit mixing head (note Ch. 7.3).
4. Replace double nipple.
5. Fit outlet flange to multifunction assembly W-MF (note
Ch. 4.5).
6. Carry out soundness test (note Ch. 4.6).
7. Switch an electrical supply.
8. Open gas ball valve.
9. Check combustion values, if necessary
re-commissioning burner.
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