Replacing components
76 Installation and maintenance instructions ecoTEC plus 0020116700_01
14
b
Caution.
Risk of damage to boiler and possible
malfunctions.
The use of lubricant can block function-
related channels in the venturi.
> Never use lubricant when installing the
gas restrictor.
> Refit the components in the reverse order. Use new
seals.
> After installing the new venturi, perform a gas family
check (¬section12.1.5) and a gas ratio setting
(¬section10.11).
14.6 Replacing the expansion vessel
> Drain the boiler (¬section12.2.2).
1
2
3
4
14.11 Replacing the expansion vessel
> Slacken the screw connection (4) at the water connec-
tion 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 (¬section12.4.7).
> Fill and purge the boiler and the system, if necessary,
after installing the new expansion vessel (¬section10.7).
> On completion of the work, check for water leaks.
14.7 Replacing the heat exchanger
b
Caution.
Risk of damage to the heat exchanger.
> You can neither loosen nor tighten the
four screws (¬fig.14.13, pos.1).
> Drain the boiler (¬section12.2.2).
> Remove the compact thermal module (¬section12.4.1).
> Detach the condensate drain hose from the heat
exchanger.
1
2
3
14.12 Replacing the heat exchanger
> Detach the clamps (2, ¬fig.14.12) and (3, ¬fig.14.12)
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.14.12) from each of the two
brackets of the heat exchanger.
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