Replacing Insulating Mats; Replacing The Fan; Replacing The Heat Exchanger - Vaillant ECOTEC PLUS VU 80 Installation And Maintenance Instructions Manual

15 Replacing components
> On the VU GB 806/5-5 only: Use the three nuts to
secure the burner and the bracket for the insulation pro-
tection plate. Tightening torque: 4 Nm
> On the VU GB 1006/5-5 and VU GB 1206/5-5 only:
First, use two nuts to secure the burner. Tightening
torque: 4 Nm
> On the VU GB 1006/5-5 and VU GB 1206/5-5 only:
Use the four remaining nuts to secure the burner and
the bracket for the insulation protection plate. Tighten-
ing torque: 4 Nm
> When installing the nuts, ensure that the openings in the
insulation protection plate for ignition and monitoring
electrodes lie on top of the corresponding bolts in the
burner door.
> Install the insulating mat. Ensure that the insulating mat
lies against the burner door.
> Install the insulation protection plate by turning the bay-
onet fitting until it clicks into place.
> Install the ignition and monitoring electrodes. Use new
seals for this. Tightening torque: 2.8 Nm
> Install the gas-air mixture unit (¬ section 13.5.6).
> Check that the product functions correctly and check the
leak-tightness (¬ section 13.5.9).
15.5

Replacing insulating mats

If the safety cut-out on the burner door has been triggered,
the insulating mat between the burner door and burner
room may be damaged.
> Check and replace the insulating mat.
To replace the insulating mat, proceed in the same way as
when removing the burner (¬ section 15.4). It is not neces-
sary to remove the burner.
15.6

Replacing the fan

> Remove the gas-air mixture unit (¬ section 13.5.1).
> Remove the burner (¬ section 15.4).
64
1
15.4 Replacing the fan
> Unscrew the four screws (1) from the fan.
> Install a new fan and burner in the same position as
before.
15.7

Replacing the heat exchanger

> Drain the boiler (¬ section 13.2.2).
> Remove the gas-air mixture unit (¬ section 13.5.1).
> Unscrew the flow and return line in the front area of the
underside of the boiler.
1
15.5 Loosen the clamps on the flow and return pipes
> Loosen the clamps (1) on the sealing collars of the flow
and return pipes in the base area.
ecoTEC plus installation and maintenance instructions 0020134823_01