Inspect Main Heat Exchanger; Inspect Burner - Vaillant ecoMAX SERIES Instructions For Installation And Servicing

7 Servicing
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Fig. 7.1 Removing the compact thermal module
Remove burner assembly
• Remove screw (1) and disconnect air inlet pipe (2).
• Disconnect gas supply from gas valve by undoing
union (4).
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Fig. 7.2 Disconnecting gas supply from the gas valve assembly
• Disconnect HT lead and earth lead (3) from spark elec-
trode.
• Remove five nuts (7) from burner manifold.
• Pull forward complete burner, gas valve and fan
assembly.
• Disconnect two electrical connections (5 and 6) from
fan and gas valve.
• Remove burner, gas valve and fan assembly (8) from
boiler (9).
Note:
The compact thermal module may be very hot
and care should be taken when removing the
module. The compact thermal module must not
be suspended from the corrugated gas tube.
Important:
Under no circumstances should the venturi tube
be removed and dismantled from the gas valve
as this part is sealed and gas checked during
production.
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Fig. 7.3 Renewing the seals (1) and checking the burner flange
insulation (2)

7.2.2 Inspect main heat exchanger

With the burner and fan assembly removed it is now
possible to inspect the main heat exchanger.
Remove any loose deposits from the heat exchanger
using a soft brush and jet of water (ensure that water is
kept away from all electrical components.
Any water used to clean the main heat exchanger will
drain through the condensate trap).
Fig. 7.4 Inspecting the main heat exchanger

7.2.3 Inspect burner

• Visually inspect burner for signs of damage or deterio-
ration.
• Ensure a gap of 4 mm exists between the spark elec-
trode and earth probe.
• Check that the burner manifold sealing gasket is in
good condition.
• The burner is maintenance–free and does not require
cleaning. The burner must be replaced if its outer sur-
face shows any signs of damage (fig. 7.5).
Fig. 7.5 Inspecting the burner
Instructions for installation and servicing ecoMAX
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