Cleaning The Heat Exchanger; Checking The Burner - Vaillant ecoTEC VU Installation And Maintenance Instructions Manual

12 Inspection and maintenance
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12.4 Removing the compact thermal module
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The plug on the fan motor has a latching lug
with which it engages in the slot. You have to
release the latching lug by pushing it in to pull
off the plug.
> Remove the plug of the ignition line (5, ¬ fig. 12.4) and
the ground connection (6, ¬ fig. 12.4) from the ignition
electrode.
> Remove the plug (3, ¬ fig. 12.4) from the fan motor.
> Remove the plug from the gas valve (4, ¬ fig. 12.4).
> Unscrew the four nuts (7, ¬ fig. 12.4).
> Remove the entire compact thermal module (2,
¬ fig. 12.4) from the heat exchanger (1, ¬ fig. 12.4).
> Once removed, check the burner and the heat exchanger
for damage and dirt.
> If necessary, clean the components according to the fol-
lowing sections.
> Check the burner flange insulation on the module. If
signs of damage, other than small cracks, are apparent
you must replaced it (article number 193 595).

12.3.2 Cleaning the heat exchanger

Caution.
b
Risk of damage from water spray.
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.
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> Remove the compact thermal module (¬ section 12.3.1).
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12.5 Cleaning the heat exchanger
Caution.
b
Risk of damage to the heat exchanger.
> You should neither loosen nor tighten
the four screws (1).
> Clean the heating coil (3) of the heat exchanger (4)
using water or if required commercially-available white
vinegar.
> Allow the vinegar to act on the heat exchanger for
20 minutes.
> Rinse away any loose dirt with a sharp jet of water or
use a plastic brush.
> Do not point the water jet directly at the insulating sur-
face (2) on the back of the heat exchanger.
The water flows out of the heat exchanger through the con-
densate trap.

12.3.3 Checking the burner

12.6 Checking the burner
Installation and maintenance instructions ecoTEC 0020173113_01
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