Replacing Expansion Vessel; Replacing Primary Heat Exchanger - Vaillant ecoTEC SERIES Instructions For Installation And Servicing

9 Parts replacement
9.4

Replacing expansion vessel

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 service valve in the gas
supply pipe.
• Close the flow and return service valves and drain the
water from the boiler.
Fig. 9.4 Replacing expansion vessel
• Undo the nut (4) on the water pipe on the lower side
of the expansion vessel.
• Remove both screws (1) retaining plate (2) and
remove the retaining plate.
• Pull out the expansion vessel (3) forwards.
• Guide the new expansion vessel back into the appliance.
• 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).
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).
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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 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.
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2
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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
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exchanger holder.
Instructions for installation and servicing ecoTEC 839592_12
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