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14. Tighten the cap nut (2) on the gas valve and the cap
nut (8) between the gas pipes. In the process, secure
the gas pipe against twisting. Use new seals for this.
15. After you have completed this work, carry out a leak-
tightness test (function check). (→ Page 21)
16. If you have installed a new gas valve, adjust the gas
ratio setting. (→ Page 17)
9.7.3
Replacing the heat exchanger
1.
Drain the product. (→ Page 29)
2.
Remove the compact thermal module. (→ Page 29)
3.
Detach the condensate drain hose from the heat ex-
changer.
1
3
2
4.
Remove the clamps (2) and (3) from the area of the
flow and return connection.
5.
Disconnect the flow connection.
6.
Disconnect the return connection.
7.
Remove both screws (1) from both brackets.
8.
Remove the lower three screws (2) on the rear section
of the retainer.
9.
Move the bracket round to the opposite side and attach
the upper screw (1) to the side.
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.
0020258016_01 ecoTEC pure Installation and maintenance instructions
1
2
13. Insert the flow and return connections into the heat
exchanger as far as they will go.
14. Ensure that the clamps are correctly fitted to the flow
and return connections.
15. Install the compact thermal module. (→ Page 31)
16. Fill and purge the unit and, if required, the heating sys-
tem. (→ Page 19)
9.7.4
Replacing the expansion vessel
4
1.
Prepare the repair work. (→ Page 24)
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.
8.
Attach the support plate using both screws (1).
9.
Fill and purge the product and, if required, the heating
installation (→ Page 19).
10. If necessary, adjust the pressure to the static height of
the heating installation.
11. Complete the repair work. (→ Page 27)
Troubleshooting 9
1
2
3
25
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