49
Instructions for installation and servicing ecoTEC / 839592_09
9.5
Replacing primary heat exchanger
Danger!
Before replacing the component, comply with
the safety instructions in Section 9.1.
1
2
3
4
Fig. 9.5 Replacing primary heat exchanger
• Disconnect the appliance from the mains as described in
Section 9.1, and close the service valve in the gas supply pipe.
• Close the flow and return service valves and drain the
appliance.
• Remove the burner module as described under 7.2.1.
• Remove the expansion vessel as described under 9.4.
• Pull out the condensate pipe to the siphon from the
primary heat exchanger.
3
2
1
Fig. 9.6 Primary heat exchanger holder
• Pull out the clamps (
1
) and (
2
) and free the return pipe
as well as the flow pipe on the primary heat exchanger.
• Remove the four screws (
3
) on the primary heat
exchanger holder.
• Disconnect the plug-in connection (
2
) of the thermal
fuse in the primary heat exchanger.
• Remove the three screws (
3
) on the primary heat
exchanger holder.
• 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 in reverse
order and replace the seals.
Caution!
Risk of damaging the primary heat exchanger!
Neither loosen nor retighten the four screws
(Fig. 9.5, Pos. 4).
Caution!
Insert the seal rings for the flow and return pipe
on the primary heat exchanger with a suitable
lubricant.Insert the flow and return connection
in the primary heat exchanger as far as they will
go and make sure the clamps are fitted correctly
on the flow and return pipe (see fig. 9.5).
• Fill and vent the boiler as required.
• After completing the work, check for gas and water
leaks and perform a function check (see section 7.6)!
9.6
Replacing electronics and display
Danger!
Before replacing the component, comply with
the safety instructions in Section 9.1.
• Comply with the assembly and installation manuals
provided with the spare parts.
Replacing display or electronics
If you are replacing only one of the two components, the
parameter adjustment functions automatically. On turning on
the appliance, the new component takes over the previously
set parameters from the components that are not replaced.
Replacing display and electronics
When replacing both components, after being turned on,
the appliance goes to fault and displays the error mes-
sage “
F70
”.
• In the second diagnostic level, under the diagnostic
number “
d.93
” enter the number of appliance variant
according to Table 9.1 (see section 8.1.2).
The electronics is now set to the appliance type and the
parameters of all adjustable diagnostics numbers corre-
spond to the factory settings.
Parts replacement 9
Summary of Contents for ecoTEC pro 24
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