Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 44

9. Insert the gas injector for the gas group in question into
the new Venturi (yellow: G20 natural gas, grey: Lique-
fied petroleum gas).
10. When inserting the gas injector, ensure that the gas
injector is correctly aligned using the indicated position
marks on the upper side of the Venturi and also the
positioning pins (5) on the underside of the gas injector.
11. Refit the components in the reverse order. Use new
seals for this.
12. After installing the new Venturi, carry out a gas setting.
(→ Page 31)
13. If you cannot adjust the CO2 content, the gas injector
has been damaged during installation. In this case,
replace the gas injector with an appropriate spare part.
14. Perform a gas family check. (→ Page 29)
13.6.5 Replacing the heat exchanger
1. Drain the product. (→ Page 39)
2. Remove the compact thermal module. (→ Page 37)
3. Detach the condensate discharge hose from the heat
exchanger.
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4. Remove the clamps (2) and (3) from the flow connec-
tion and the return connection.
5. Detach the flow connection.
6. Detach the return connection.
7. Remove two screws (1) on each of the two retainers.
8. Remove the lower three screws (2) on the rear section
of the retainer.
9. Swing the retainer to the side around the top screw (1).
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10. Pull the heat exchanger downwards and to the right,
and remove it from the product.
11. Install the new heat exchanger in reverse order.
12. Replace the seals.
Note
Instead of grease, use only water or com-
mercially available soft soap to aid installa-
tion.
13. Insert the flow and return connections into the heat
exchanger as far as they will go.
14. Make sure that the clamps are seated correctly on the
flow and return connections.
15. Install the compact thermal module. (→ Page 39)
16. Fill and purge the product and, if necessary, the heating
installation. (→ Page 31)
13.6.6 Replacing the expansion vessel on the heat
generator
1. Drain the product. (→ Page 39)
2. Undo the screwed connection (4).
3. Remove both screws (1) on the support plate (2).
4. Remove the support plate (2).
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.
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8. Attach the support plate using both screws (1).
9. Fill and purge the product and, if necessary, the heating
installation. (→ Page 31)
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13.6.7 Replacing the expansion vessel on the shift-
load cylinder
1. Close the cold-water isolation valve.
2. Open a hot water tap to depressurise the water circuit.
Close the hot water tap.
3. Unscrew the screw from the cover of the shift-load cyl-
inder.
4. Remove the cover.
Installation and maintenance instructions ecoTEC plus 0020244998_04
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