Technical data

Installation and maintenance instructions ecoTEC exclusive 0020017768_0548
10 Replacing components
5
Fig. 10.3 Gas fitting/fan screwed joint
• Release both fixing screws (5) on the gas fitting and
remove the fan from the gas fitting.
• Replace the defective component.
a
Caution!
Mount the gas valve and the fan in the same
position as before.
• Screw the fan to the gas fitting. Use the new seals.
• Re-install the complete "gas fitting/fan" unit in
reverse sequence.
• After completing the work, check for gas leaks and
perform a function check (see Section 6).
10.4 Replacing primary heat exchanger
d
Danger!
Before replacing the component, comply with
the safety instructions in Section 10.1.
• Disconnect the appliance from the mains as described
in Section 10.1, and close the gas cock in the gas
supply pipe.
• Close the maintenance cocks - if fitted - in the heating
flow and return and drain the appliance.
• Dismantle the compact thermo module as described
under Section 8.3.1.
1
2
3
4
5
6
Fig. 10.4 Replacing primary heat exchanger
• Remove the clamps (4) on the trap (3), release the
fittings on the trap and remove the trap from the
primary heat exchanger.
• Remove the adaptor nuts of the trap from the primary
heat exchanger.
• Release the return connection (6) and the feed
connection (5) on the primary heat exchanger.
• Release the three screws (2) on the primary heat
exchanger and remove the primary heat exchanger
from the appliance.
• Mount the new primary heat exchanger in reverse
order and replace the seals.
• Fill and bleed the appliance and if needed, the plant
after installing the new primary heat exchanger.
• After completing the work, check for gas and water
leaks and perform a function check (see Section 6).
10.5 Replacing electronics and display
d
Danger!
Before replacing the component, comply with
the safety instructions in Section 10.1.
• 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 (spare part case),
after being turned on, the appliance goes to fault and
displays the error message F.70.
• In the second diagnosis level, under the diagnosis
point "d.93" enter the number of appliance variant
according to Table 10.1 (see Section 9.1.2).
The electronics is now set to the appliance type and the
parameters of all adjustable diagnosis points correspond
to the factory settings.
Appliance Number of the appliance variant
ecoTEC exclusive 832 4
ecoTEC exclusive 838 5
Table 10.1 Numbers of the appliance variants