Replacing Primary Heat Exchanger - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

9 Parts replacement
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 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).
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)!
50
Supplied By www.heating spares.co Tel. 0161 620 6677
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
1
appliance.
• Remove the burner module as described under 7.2.1.
2
• Remove the expansion vessel as described under 9.4.
• Pull out the condensate pipe to the siphon from the
primary heat exchanger.
3
1
2
4
4
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 exchang-
er.
• Remove the four screws (3) on the primary heat
exchanger holder.
3
Instructions for installation and servicing ecoTEC