Replacing Defective Components - Vaillant ecoTEC plus 806 VU GB 806/5-5 Installation And Maintenance Instructions Manual

10.10 Replacing defective components

10.10.1 Replacing the gas valve
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806/5-5
2
1006/5-5
1206/5-5
1. Remove the gas pipe (1) from the gas valve.
2. Unscrew the screws (2) from the fan and remove the
gas valve from the fan.
3. Replace the defective component.
4. Install the gas valve and the fan in the same position as
before. Use new seals for this.
5. Tighten the screws (2) in a cross-wise pattern.
Conditions: Applies for 80 kW
–
Torque: 5.5 Nm
Conditions: Applies for 100 kW and 120 kW
–
Torque: 2 Nm
6. First, screw the gas pipe loosely onto the gas valve.
Only after completing the installation work should you
tighten the screws for the flange fastening on the gas
valve.
0020134823_04 ecoTEC plus Installation and maintenance instructions
7. After installing the new gas valve, carry out a leak-
tightness test (→ Page 24), and set the gas ratio
(→ Page 21).
10.10.2 Replacing the burner
1
2
3
1
4
5
1. Remove the gas-air mixture unit. (→ Page 28)
2. Remove the ignition and monitoring electrode.
3. Remove the seal (5) from the burner door.
4. Turn the insulation protection plate (1) to remove it.
5. Remove the insulating mat (2).
6. Undo the nuts (3) on the burner.
7. Use a suitable socket (with extension) to ensure that
the burner mat does not become damaged. You must
1
not use burners that have a damaged mat.
8. Remove the burner. When doing so, hold the fan and
the burner door securely.
9. Fit the new burner with a new seal.
10. When installing the retainer, ensure that you position it
in the locations at which the insulation protection plate
has suitable cut-outs.
11. Use the three nuts and the washers (4) to secure the
burner and the retainer for the insulation protection
plate.
Conditions: Applies for 80 kW
–
Torque: 4 Nm
12. First, use two nuts to secure the burner.
Conditions: Applies for 100 kW and 120 kW
–
Torque: 4 Nm
13. Then use the four remaining nuts to secure the burner
and the retainer for the insulation protection plate.
Conditions: Applies for 100 kW and 120 kW
–
Torque: 4 Nm
14. Install the insulating mat. Note that the insulating mat is
touching the burner door and the cut-outs for the insu-
lating mat lie above the cut-outs for the burner door.
15. Install the insulation protection plate by turning the bay-
onet fitting until it clicks into place.
Troubleshooting 10
33