ecoTEC pro - Vaillant

14.5 Replacing the expansion vessel
> Loosen the screw connection (4) at the water connection
on the underside of the expansion vessel.
> Remove both screws (1) on the support plate (2).
> Remove the support plate (2).
> Pull out the expansion vessel (3) from the front.
> Insert the new expansion vessel into the boiler.
> Screw the new expansion vessel to the water connection.
Use a new seal for this.
> Attach the support plate using both screws (1).
> If necessary, adjust the pressure to the static height of
the heating installation (¬ section 12.3.7).
> Fill and purge the boiler and, if necessary, the system
after installing the new expansion vessel (¬ section
10.5).
> On completion of the work, check for water leaks.
14.5 Replacing the heat exchanger
b Caution.
Risk of damage to the heat exchanger.
> You can neither loosen nor tighten the
four screws (¬ fig. 14.7, pos. 1).
> Drain the boiler (¬ section 12.2.2).
> Remove the compact thermal module (¬ section 12.3.1).
> Detach the condensate discharge hose from the heat
exchanger.
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Replacing components 14
Installation and maintenance instructions ecoTEC pro 0020129672_03 61
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14.6 Replacing the heat exchanger
> Detach the clamps (2, ¬ fig. 14.6) and (3, ¬ fig. 14.6)
from the flow connection and the return connection.
> Detach the flow connection from the heat exchanger.
> Detach the return connection from the heat exchanger.
> Remove two screws (1, ¬ fig. 14.6) from each of the two
brackets of the heat exchanger.
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14.7 Heat exchanger brackets
> Disconnect the plug connection (2, ¬ fig. 14.7) of the
thermal fuse in the heat exchanger.
> Remove the bottom three screws (3, ¬ fig. 14.7) from
the rear part of the heat exchanger bracket.
> Swivel the bracket around the top screw (1, ¬ fig. 14.7)
to one side.
> Pull the heat exchanger downwards and to the right, and
remove it from the boiler.
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