Removing The Compact Thermal Module; Cleaning The Heat Exchanger - Vaillant ecoTEC pro 24 Installation And Maintenance Instructions Manual

10 Inspection and maintenance
10.1

Removing the compact thermal module

Note
The compact thermal module consists of four
main components:
– Speed-regulated fan,
– Gas/air connection,
– Gas supply (mixture pipe) with burner flange,
– Premix burner.
Danger!
Risk of death and risk of material damage
caused by hot flue gas.
The seal, insulating mat and self-locking nuts
on the burner flange must not be damaged.
Otherwise, hot flue gases may escape and
cause personal injury and material damage.
▶
Replace the seal each time you open the
burner flange.
▶
Replace the self-locking nuts on the
burner flange each time you open the
burner flange.
▶
If the insulating mat on the burner flange
or on the back wall of the heat exchanger
shows signs of damage, replace the insu-
lating mat.
1. Switch off the product using the on/off button.
2. Close the gas isolator cock.
3. Remove the front casing.
4. Tilt the electronics box forward.
5. Unscrew the retaining screw (2) and remove the air
intake pipe (1) from the intake stub.
6. Unscrew either the cap nut on the gas valve (3) or the
cap nut (4) between the gas pipes.
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7. Remove the ignition line plug (5) and the earth line plug
(6) from the ignition electrode.
8. Remove the plug (3) from the fan motor.
9. Remove the plug (4) from the gas valve.
10. Unscrew the four nuts (7).
11. Remove the entire compact thermal module (2) from
the heat exchanger (1).
12. Check the burner and the heat exchanger for damage
and dirt.
13. If necessary, clean or replace the components accord-
ing to the following sections.
14. Fit a new burner flange seal.
15. Check the insulating mat on the burner flange and on
the back wall of the heat exchanger. If you notice any
signs of damage, replace the relevant insulating mat.
10.2

Cleaning the heat exchanger

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1. Protect the folded down electronics box against sprayed
water.
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2. Never undo the four nuts on the stud bolt (1) or tighten
them.
3. Clean the heating coil (3) of the heat exchanger (4) us-
ing water or, if required, vinegar (to a maximum of 5%
acid). Allow the vinegar to act on the heat exchanger for
20 minutes.
4. 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 mat (2) on the back of the heat ex-
changer.
Installation and maintenance instructions ecoTEC pro 0020244995_02
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