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• Only ecoTEC exclusive 832: Pull out the plug from the
fan printed circuit board.
Only ecoTEC exclusive 838: Open the coupling of the
mains input.
• Release the four screws (3) on the compact thermo
module .
• Remove the complete "gas fitting/fan" unit.
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 Chapter 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 Chapter 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 8.4.1.
ecoTEC exclusive installation and maintenance instructions / 0020017768_02
Replacing components 10
6
5
4
3
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 pri-
mary 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 Chapter 6)!
1
2
43
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