Parts replacement
70 Instructions for installation and servicing ecoTEC 839592_13
9
> Pull out the expansion vessel (3) forwards.
> Guide the new expansion vessel back into the appli-
ance.
> Re-connect the new expansion vessel using a new
seal.
> Refix the retaining plate.
> Check the pressure of the expansion vessel (minimum
pressure (0.75 bar) 75 kPa).
If necessary, adjust the pressure to the static height
of the heating system.
> Fill and vent the boiler.
> After completing the work, check for water leaks and
perform a function check (see section 7.6).
9.5 Replacing primary heat exchanger
a
Danger!
Risk of personal injury and/or material
damage as a result of improper installation!
You need to follow the corresponding safety
instructions in order to safely replace the
component.
> Before replacing the component, comply
with the safety instructions in section 9.1.
> 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.
1
2
4
3
Fig. 9.5 Replacing primary heat exchanger
> 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.
b
Caution!
Possible material damage caused by loos-
ening or retightening the screws!
The primary heat exchanger may become
damaged.
> You should neither loosen nor tighten the
four screws (Fig. 9.5, Pos. 4).
3
2
1
Fig. 9.6 Primary heat exchanger holder
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