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7.
Undo the cap nut (2) on the pump's return connection
and remove the pipe from the return connection on the
heat exchanger.
8.
Remove the pipe from the flow connection on the heat
exchanger.
9.
Remove the water hammer arrester's casing (6).
10. Unscrew the cap nut (5) on the cold water pipe above
the water hammer arrester.
11. Remove the screws (1) on the support plate for the
heat exchanger on the casing top.
12. Remove two screws (7) on each of the two retainers.
13. Remove the all-gas sensor. (→ Page 26)
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14. Remove the lower three screws (3) on the rear section
of the retainer on the left.
15. Support the heat exchanger and swing the retainer (2)
to the side around the top screw (1).
16. Pull the heat exchanger downwards and to the left, and
remove it from the product.
17. Push the new heat exchanger into the air/flue gas con-
nection from above.
18. Push the heat exchanger into the groove in the retainer
on the right and swing the retainer on the left back into
its original position.
◁
The heat exchanger is now held in place by the
guides in the two retainers.
19. Install the two front clamps on the retainers and then
fit the screws you removed in the retainer on the left
(always work in this order).
20. Install all the connections and the all-gas sensor in the
reverse order.
21. Replace the seals and install the water hammer arrest-
er's casing.
Note
To make the installation easier, use only
the lubricant that may be included with the
Vaillant spare part. If no lubricant is included
with the Vaillant spare part, use only water or
commercially available soft soap.
22. Ensure that the clamps on the heat exchanger's con-
nections are seated correctly.
23. Install the compact thermal module. (→ Page 28)
24. Install the left-hand side section.
0020189875_01 ecoTEC exclusive Installation and maintenance instructions
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25. Fill (→ Page 18) and purge (→ Page 18) the product
and, if required, the heating installation.
9.7.5
Replacing the expansion vessel
1.
Drain the product. (→ Page 29)
2.
Remove the right side section.
3.
Undo the screwed connection (4).
4.
Remove both screws (1) on the support plate (2).
5.
Remove the support plate (2).
6.
Pull out the expansion vessel (3) towards the front.
7.
Insert the new expansion vessel into the product.
8.
Screw the new expansion vessel to the water connec-
tion. Use a new seal for this.
9.
Attach the support plate using both screws (1).
10. Install the right side section.
11. Fill (→ Page 18) and purge (→ Page 18) the product
and, if required, the heating installation.
9.7.6
Replacing the PCB or the display
Note
If you only replace one component, when the
product is switched on, the new component ad-
opts the parameters that were previously set from
the component that was not replaced.
1.
Open the electronics box. (→ Page 13)
2.
Replace the PCB or display according to the assembly
and installation instructions supplied.
3.
If you are replacing the PCB, remove the coding res-
istor (1) (plug X24) from the old PCB and plug the plug
onto the new PCB.
4.
Close the electronics box.
Troubleshooting 9
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