Vaillant ecoTEC plus 612, Instructions For Installation And Servicing

Page: 50 / 184

Supplied By www.heating spares.co Tel. 0161 620 6677
50
Instructions for installation and servicing ecoTEC
1
2
3
4
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)!
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.
1
2
3
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.
9 Parts replacement