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LNVx Range Users, Installation & Servicing Instructions Doc Ref M104 issue 1.0 Sep 2018.
4. Release the inlet connection flange from the gas valve
by removing the four screws.
5. If required remove the manifold by removing the four
screws securing it to the burner assembly.
6. Remove the two screws that secure the top of the
burner assembly to the bulkhead and lift out burner
assembly.
7. Using a stiff brush, not a wire brush, brush the
burners to dislodge accumulated deposits. Inspect the
burners both internally and externally to ensure that
they are clean. Examine the injectors and if damaged or
deteriorated, replace with new ones of the correct size
and marking. If deemed necessary, clean the injectors. Do
not broach out with wire.
8. Reassemble the injectors, manifold and burners in
reverse order to that above.
Note: The ignition electrode is located at the
bottom of the burner assembly, the
rectification electrode is located at the top of
the burner assembly.
Inspect the electrodes, making sure that they are in a
sound and clean condition. In particular check that the
ignition electrode is clean and undamaged. Check that the
spark gap is 2.5mm and that the rectification probe is 10 -
12mm forward of the burner.
2.5mm
Ignition Electrode Spark Gap
1. Remove the four screws securing the flue outlet socket.
2. Disconnect the fan electrical connections from the main
terminal strip
3. Remove the screws securing the fan mounting box to
the exhaust header plate.
4. Clean impeller by brushing with a stiff brush.
5. Re-assemble using a new sealing gasket to the fan
mounting box. Use silicon sealant around the joints.
Whilst the main burner assembly is removed from the
unit, check that the primary sections that the burners fire
into are clean
1. Inspect the fan blades for any damage or excessive
buildup of deposits that could give rise to an imbalance.
Remove the assembly for cleaning as follows.
2. Slacken the cable gland on the heater casing through
which the fan electrical cable passes.
3. Disconnect the fan leads from the electrical terminals.
4. Withdraw cable through entry grommet.
5. Remove the fan and motor assembly complete by
removing the hexagon headed screws that secure the fan
to the rear panel.
6. Reassemble in reverse order.
1. Remove section side panel(s) and inspect the fan blades
for any damage or excessive buildup of deposits that
could give rise to an imbalance. Remove the assembly for
cleaning as follows.
2. Slacken the cable gland on the casing through which
the fan electrical cable passes.
3. Disconnect the fan leads from the electrical terminals
in the contactor enclosure.
4. Withdraw cable through entry grommet.
5. Remove the complete fan assembly by removing the
fixings securing the fan to the base rails.
6. Reassemble in reverse order.