Cleaning The Heat Exchanger - Vaillant ecoTEC plus Installation And Maintenance Instructions Manual

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. (→ Page 13)
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 corrugated gas pipe and the
fixed gas pipe.
0020209593_01 ecoTEC plus Installation and maintenance instructions
Inspection and maintenance 10
8
7
6
7. Remove the plugs of the ignition line (7) and of the
ground connection (6) from the ignition electrode.
8. Remove the plug (4) from the fan motor by pushing in
the latching lug.
9. Remove the three plugs from the gas valve (5).
1
10. Remove the plug from the Venturi (3) by pushing in the
latching lug.
2
11. Release the cable harness from the clip on the gas
valve retainer.
3
12. Unscrew the four nuts (8).
13. Remove the entire compact thermal module (2) from
the heat exchanger (1).
14. Check the burner and the heat exchanger for damage
and dirt.
15. If necessary, clean or replace the components accord-
ing to the following sections.
16. Fit a new burner flange seal.
17. Check the insulating mat on the burner flange and on
the back wall of the heat exchanger. If you notice any
4
signs of damage, replace the relevant insulating mat.
10.4

Cleaning the heat exchanger

1. Protect the folded down electronics box against sprayed
water.
1
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.
1
2
3
4
5
2
3
4
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