Technical data

68 Installation and maintenance instructions ecoTEC plus 937 0020031552_06
10.5 Replacing the primary heat exchanger
a
Danger!
Risk of personal injury and/or material
damage as a result of non-compliance with
the safety instructions.
Before replacing the component, comply
with the safety instructions in Chapter 10.1.
Disconnect the appliance from the mains as described
in Chapter 10.1, and close the gas isolator valve in the
gas supply pipe.
Close the stop valves in the flow and return pipes and
drain the water out of the combi boiler.
Remove the compact thermo module as described
under 8.2.1.
Remove the expansion tank as described under 10.4.
Pull off the condensate pipe which runs from the pri-
mary heat-exchanger to the siphon.
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2
4
3
Fig. 10.5 Replacing the primary heat exchanger
Remove the clamps (1) and (2) and pull off the flow
and return hoses from the primary heat-exchanger.
Unscrew the four screws (3) on the holder of the pri-
mary heat-exchanger.
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3
2
1
Fig. 10.6 Holder for the primary heat-exchanger
Pull the plug connection (2) of the thermal fuse off
the primary heat-exchanger.
Unscrew the three screws (3) on the holder of the
primary heat-exchanger.
Turn the holder to the side around the rivet (1), pull
the primary heat exchanger downwards to the right
and remove it from the appliance.
Mount the new primary heat exchanger.
Fit a new burner door seal kit.
Fit the burner module.
Continue to replace in the reverse order.
i
A new burner door seal kit must be fitted
every time the burner door is removed.
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10 Replacing components