Replacing components
80
Installation and maintenance instructions ecoTEC plus 0020134833_01
14
14.8
Replacing the expansion vessel of the
layered storage tank
>
Close the cold water stop valve.
>
Open a hot water valve to depressurise the water circuit.
Close the hot water valve.
>
Unscrew the bolt from the cover of the layered storage
tank.
>
Remove the cover.
1
2
14.14
Replacing the expansion vessel of the layered storage
tank
The expansion vessel (
1
) is freely accessible.
>
Undo the nuts (
2
) on the expansion vessel (
1
).
>
Detach the expansion vessel from the screwed pipe and
remove it from the EPS insulation.
>
Insert the new expansion vessel into the EPS insulation.
>
Reconnect the new expansion vessel. To do this, use a
new seal.
>
Check the filling pressure of the expansion vessel (mini-
mum pressure is 4 bar).
>
Fill and purge the boiler and the layered storage tank.
14.9
Replacing the cylinder charging pump on
the layered storage tank
>
Close the stop valve on the hot water system and drain
the boiler and layered storage tank on the hot water
side.
1
4
5
6
2
3
14.15 Replacing the cylinder charging pump
>
Remove the discharge pipe (
1
) from the expansion relief
valve on the boiler.
>
Fold the electronics box forwards (
¬ section 8.2
).
>
Open the electronics box (
¬ section 8.2
).
>
Pull the plug (
X12
) out of the PCB.
>
Pull the free end of the line carefully through the grom-
mets on the boiler and on the layered storage tank.
>
Loosen the pump sensor line from the cable harness by
pulling the plug out of the cable harness.
>
Unscrew the pipe elbow (
6
) from the casing.
>
Undo the screwed connection (
2
) on the connection pipe
(
3
).
>
Undo the spring clip (
5
) on the casing of the cylinder
charging pump (
4
). At the same time, use your free hand
to support the cylinder charging pump to ensure that it
does not fall out of the casing.
>
Pull the cylinder charging pump downwards out of the
casing.
>
Fit the pipe elbow to the new cylinder charging pump
and use new seals for it.
>
Install the new cylinder charging pump in reverse order
and use new seals for it.
>
Connect the pump's electrical lines in reverse order. In
doing so, pay attention to the correct pipe routing.
>
Refit the discharge pipe (
1
) and use new seals.
>
Fill and purge the boiler and the layered storage tank.
Summary of Contents for ecoTEC plus VUI
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