Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 34

9 Troubleshooting
5. Pull out the expansion vessel (3) towards the front.
6. Insert the new expansion vessel into the product.
7. Screw the new expansion vessel to the water connec-
tion. Use a new seal for this.
8. Attach the support plate using both screws (1).
9. Fill and purge the product and, if necessary, the heating
installation. (→ Page 24)
9.6.7 Replacing the expansion vessel on the
shift-load cylinder
1. Close the cold water stop valve.
2. Open a hot water valve to depressurise the water cir-
cuit. Close the hot water valve.
3. Unscrew the screw from the cover of the shift-load cyl-
inder.
4. Remove the cover.
2
1
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.
9.6.8 Replacing the cylinder charging pump on
the shift-load cylinder
1. Close the hot water system stop valves and drain the
heat generator and shift-load cylinder on the hot water
side.
34
1
6
5
4
2. Remove the discharge pipe (1) from the expansion re-
lief valve on the heat generator.
3. Tilt 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 casing.
9. Undo the screwed connection (2) on the connection
pipe (3).
10. Detach the spring clip (5) from the casing 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 casing.
11. Pull the cylinder charging pump downwards out of the
casing.
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 lines in reverse order. In
doing so, pay attention to the correct pipe routing.
15. Reinstall the discharge pipe (1) and use new seals.
16. Fill and purge the heat generator and the shift-load
cylinder.
Installation and maintenance instructions ecoTEC plus 0020209593_01
2
3