42 | Servicing and spares
Product Name6 720 ... ... (YYYY/MM)
▶ gas way for leaks or obstructions
▶ the condition of burner,
After all checks have been and the CO
2
is still out of tolerance then the
gas valve must be replaced.
10.9 Cleaning the heat exchanger
If the Heat Exchanger requires cleaning:
An accessory kit is available (No. 840) specifically designed for cleaning
the heat exchanger. If required order 7 719 001 996.
1. Remove the cleaning access cover [1], seal [2] and metal plate [3]
securing it, if present.
2. Unscrew the condensation trap cap and place a suitable container
underneath.
3. Loosen any deposits in the heat exchanger from top to bottom using
the cleaning blade [4].
▶ Clean the heat exchanger from top to bottom using the brush [5].
▶ Refit the “cleaning” access cover in reverse order using a new seal
[2], hand tighten screws and then use a spanner to tighten a further
half turn.
▶ After re-assembly check that the CO/CO
2
levels are as described in
the section “Setting the air/gas ratio”.
Fig. 60 Cleaning the heat exchanger
[1] Inspection cover
[2] Inspection cover seal
[3] Back plate (if fitted)
[4] Cleaning blade
[5] Cleaning brush
To clean the burner
▶ Check that the boiler is completely isolated from the gas supply.
1. Remove the clips [1], castellated nuts [2] and springs [3] from the
studs.
▶ Unscrew and remove the two hexagon headed nuts [4] securing the
fan.
▶ Remove the nut [5] from the rear stud [6].
Remove the burner head [7].
2. Remove the burner and clean the components.
Do not use a wire brush.
Fig. 61
[1] Clips
[2] Castellated nuts
[3] Washers/Springs
[4] Hex head nuts
[5] Rear nut
[6] Spacer
Re-assembly of the burner cover
▶ Re-assemble the burner in reverse order using a new seal [8].
▶ Insert the burner cover under the rear securing bolt and tighten
down.
▶ Assemble the washers/ spring [3], and castellated nut [2], refer to
figure 62, on to the studs [11] to secure the burner cover to the heat
exchanger.
▶ Using a 10mm spanner, tighten the castellated nuts [2] until the
burner cover bottoms out on the heat exchanger.
▶ The nuts will stop turning at this point, do not overtighten.
▶ If necessary, back the nuts off slightly until the hole for the clip [1] is
visible.
▶ Insert the clips [1] and secure.
▶ After re-assembly check that the CO/CO
2
levels are as described in
the section “Setting the air/gas ratio”.
WARNING: Cleaning access cover
▶ Do not remove the cover unless a new gasket is
available for re-assembly.
NOTICE: After completing the appliance service the
CO/CO
2
must be checked and set to the limits in the
section “AIR/GAS RATIO”.
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WARNING: Burner
▶ Do not remove the burner unless a new gasket is
available for re-assembly.
NOTICE: Burner gasket seal
▶ Always replace the burner seal with a new one when
the joint has been disturbed.
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