Vaillant ECOTEC PLUS VU 80 Installation And Maintenance Instructions Manual page 52

13 Inspection and maintenance
> Remove the plug from the upper safety cut-out (8).
> Undo the screws (6) on the burner door.
> Remove the complete gas-air mixture unit (5) from the
heat exchanger (7).
> Check the burner and the heat exchanger for damage
and dirt.
13.5.2 Cleaning the heat exchanger
Caution.
b
Risk of material damage from spraying
water.
If you fail to protect the electronics box
adequately, water can penetrate the box
during cleaning and may damage the elec-
tronics.
> Protect the folded down electronics box
against sprayed water.
> Remove the gas-air mixture unit (¬ section 13.5.1).
1
13.8 Cleaning the heat exchanger (example: VU GB 806/5 - 5)
Caution.
b
Risk of damage to the heat exchanger.
> You should neither loosen nor tighten
the screws (2).
Before flushing, we recommend removing the condensate
siphon so that the neutralising unit is not damaged.
> Rinse away any dirt from the burner chamber wall and
through the pipes (1) of the heat exchanger using a
strong jet of water or use a plastic brush.
The water flows out of the heat exchanger through the
drain.
52
If you have removed the condensate siphon, reinstall it
below the boiler after cleaning (¬ section 13.5.5) so that
the heat exchanger is ready for operation again.
13.5.3 Checking the burner
1
2
3
4
13.9 Check the burner (Example: VU GB 806/5 - 5)
> Check the surface of the burner for damage. If you
notice any damage, replace the burner and seal
(¬ section 15.4).
> Check the insulating mat (2) on the burner door. If you
notice any signs of damage, replace the insulating mat
(¬ section 15.5).
> Check the burner door seal (4) on the burner door. If you
notice any signs of damage, replace the seal. See
"Replacing the burner" (¬ section 15.4).
13.5.4 Replace the ignition and ionisation
electrode
We recommend that you replace the ignition and ionisation
electrode every 2 years.
ecoTEC plus installation and maintenance instructions 0020134823_01