51Installation and maintenance manual ecoTEC
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Fig. 9.4 Replacing expansion tank
• Loosen the screw (4) on the water pipe on the lower
side of the expansion tank.
• Loosen both screws (1) retaining plate (2) and remove
the retaining plate.
• Pull out the expansion tank (3) forwards.
• Guide the new expansion tank back into the appliance.
• Screw on the new expansion tank by using a new seal
again with the water pipe.
• Fasten the holding plate again and tighten the expan-
sion tank on the holding plate.
• Check the admission pressure of the expansion tank
(minimum pressure 0.75 bar).
If necessary, adjust the admission pressure to the stat-
ic height of the heating system.
• Fill and evacuate the appliance and if needed, the
plant after installing the new expansion tank.
• After completing the work, check for water leaks and
perform a function check (see Section 7.6)!
9.5 Replacing primary heat exchanger
Danger!
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 maintenance tap in the
gas supply pipe.
• Close the maintenance cocks in the heating supply and
return and empty the appliance.
• Dismantle the compact thermo module as described
under 7.2.1.
• Dismantle the expansion tank as described under 9.4.
• Pull out the condensate pipe to the siphon from the
primary heat exchanger.
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Fig. 9.5 Replacing primary heat exchanger
• Pull out the clamps (1) and (2) and loosen 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.
Replacing components 9
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