Cleaning The Heat Exchanger; Checking The Burner; Installing The Compact Thermal Module; E Danger - Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

8 Inspection and maintenance
Danger!
H
Danger of combustion and damage due to
escaping hot flue gases!
The silicone seal and the silicate cord on the
compact thermal module (No. 180904) must be
replaced at every maintenance operation. The
insulating layer on the burner door
(No. 180913) must not exhibit any signs of
damage; otherwise it must also be replaced
(see Chap. 8.3.4).

8.3.2 Cleaning the heat exchanger

a Caution!
Danger of short-circuiting and irrepairable
damage to the PCB and fan!
Protect the downfolded electronic box and also
the fan against splash water.
Fig. 8.3 Cleaning the heat exchanger
• Dismount the compact thermal module as described
under 8.3.1.
• Clean the heating coil (2) of the heat exchanger (3)
using commercially-available essence of vinegar. Flush
with water. The water flows out of the heat exchanger
through the condensate siphon. You can also clean
the condensate trap via the opening (4).
• Allow the cleaning agent to take effect for
approximately 20 minutes then rinse off the loose
dirt. To clean the coils you can use a brush with
synthetic bristles, but no aids with metallic or similar
materials. Avoid getting large amounts of water
directly on the insulating mat at the back wall of the
heat exchanger. Otherwise the insulating mat can be
damaged.
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8.3.3 Checking the burner

The burner is maintenance-free and needs no cleaning.
• Check the surface of the burner for damage, replace
the burner if necessary.
• After checking/repairing the burner install the
compact thermal module as described in Chap. 8.3.4.

8.3.4 Installing the compact thermal module

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2
Fig. 8.4 Replacing the seals and the insulating layer on the
burner door
H Danger!
Danger of combustion and damage due to
escaping hot flue gases!
The silicone seal and the silicate cord on the
compact thermal module (No. 180904) must be
replaced at every maintenance operation. The
insulating layer on the burner door
(No. 180913) must not exhibit any signs of
damage; otherwise it must also be replaced.
Installation and maintenance instructions ecoTEC 0020029173_01
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