Replacing Expansion Vessel - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

Wall hung room sealed fan assisted condensing boiler
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9 Parts replacement
• Remove the air intake pipe (Fig. 7.1, Pos. 2).
• Loosen the gas supply pipe on the gas fitting (Fig. 7.2,
Pos. 3).
1
2
4
3
Fig. 9.2 Dismantling fan with gas fitting
• Pull out the plug (4) from the gas valve.
• Pull out the plug (3) from the fan.
• Remove the three screws (2) on the burner module (1).
• Remove the complete “gas valve/fan” unit.
5
Fig. 9.3 Gas fitting/fan screwed joint
• Remove both fixing screws (5) on the gas valve and
remove the fan from the gas valve.
• Replace the defective component.
Caution!
Mount the gas valve and the fan in the same
position as before.
• Screw on the fan with the gas valve. Please use new seals.
• Install the complete “gas valve/fan” unit in reverse
sequence.
• After completing the work, check for gas leaks and
perform a function check (see section 7.6)!
9.4

Replacing expansion vessel

1
2
3
4
Fig. 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.
• 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)!
Page 48

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