Vaillant ecoTEC plus VUI Series Installation And Maintenance Instructions Manual page 54

1. Remove the compact thermal module.
(→ Section 12.7.1)
2. Remove the ignition electrode. (→ Section 13.7.17)
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3. Turn the two screws (5) between the burner flange (6)
and the fan.
4. Remove the burner flange.
5. Fit the new burner (3) with a new burner seal (2) to the
new burner flange.
6. Tighten the three screws (4); for tightening torques,
see the appendix.
7. Fit the new burner flange with a new burner flange seal
(1). Replace the seal (7) between the burner flange
and the fan.
8. Tighten the two screws on the burner flange; for tight-
ening torques, see the appendix.
9. Install the new control electrode on the new burner
flange. (→ Section 13.7.17)
Note
Only touch the ignition and control elec-
trodes at the ceramic section.
10. Insert the ignition electrode with a new seal.
11. Install the compact thermal module. (→ Section 12.7.2)
12. Check the O₂ content. (→ Section 9.13.4)
13.7.6 Replacing the fan
1. Remove the gas valve assembly. (→ Section 13.7.7)
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10.
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Remove the plug or, if required, the two plugs from the
fan motor.
Unscrew the air intake pipe from the upper retainer, tilt
the air intake pipe forwards, and remove the air intake
pipe from the intake stub.
Unscrew the two screws (2) between the mixture pipe
and the fan flange.
Remove the fan (1).
Insert the new fan. When doing so, replace all of the
seals.
Screw the two screws between the mixture pipe and
the fan flange in tightly. Tightening torque, see ap-
pendix.
Install the gas valve assembly. (→ Section 13.7.7)
Plug the air intake pipe onto the intake stub, tilt the air
intake pipe backwards and push the air intake pipe into
the upper retainer.
Connect the plug or, if required, the two plugs to the
fan motor.
Installation and maintenance instructions 0020308121_04
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