Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 45

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5. Undo the nuts (2) on the expansion vessel (1).
6. Detach the expansion vessel from the screwed pipe
and remove it from the EPS insulation.
7. Insert the new expansion vessel into the EPS insula-
tion.
8. Connect the new expansion vessel. To do this, use a
new seal.
9. Check the filling pressure of the expansion vessel (min-
imum pressure is 0.4 MPa (4 bar)).
10. Fill and purge the heat generator and the shift-load
cylinder.
13.6.8 Replacing the cylinder charging pump on the
shift-load cylinder
1. Close the domestic hot water system isolation valves
and drain the heat generator and shift-load cylinder on
the domestic hot water side.
0020244998_04 ecoTEC plus Installation and maintenance instructions
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2. Remove the drain pipe (1) from the expansion relief
valve on the heat generator.
3. Hinge the heat generator's electronics box forward.
4. Open the electronics box.
5. Pull the X12 plug out of the PCB.
6. Pull the free end of the line carefully through the grom-
mets on the heat generator and on the shift-load cylin-
der.
7. Detach the pump sensor line from the cable harness by
pulling the plug out of the cable harness.
8. Unscrew the pipe elbow (6) from the housing.
9. Undo the screwed connection (2) on the connection
pipe (3).
10. Detach the spring clip (5) from the housing of the cylin-
der 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 housing.
11. Pull the cylinder charging pump downwards out of the
housing.
12. Install the pipe elbow on the new cylinder charging
pump and use new seals for it.
13. Install the new cylinder charging pump in reverse order
and use new seals.
14. Connect the pump's electrical wires in reverse order. In
doing so, pay attention to the correct pipe routing.
15. Reinstall the drain pipe (1) and use new seals.
16. Fill and purge the heat generator and the shift-load
cylinder.
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