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Cleaning the boiler body and the burner
assembly
The burner assembly and the parts of the boiler
body in contact with condensation should be
cleaned once a year. To clean these parts, use
soft brushes or compressed air; do not use
chemical products or steel brushes.
To dismount the burner assembly and access
the boiler body, proceed as follows:
1. Close the gas supply cock and disconnect
the electrical power supply
2. Remove the lower protection plate and
the boiler casing
3. Disconnect cables "G" and "H" of the
electrodes from the ignition devices, Fig.
23a
4. Remove the ignition devices from the val-
ve body, unscrewing screw "A"
5. Loosen the two fastening screws "B" and
slide the control panel support bracket
"C" and all the wiring forward. Fasten the
bracket in the position of maximum
extension
6. Disconnect the gas valve from the gas
inlet pipe, unscrewing the union nut behind
the valve, disconnect the flexible inlet air
pipe coupling "E" from the fan and the
compensation pipe "F" from the gas val-
ve.
7. If there is less than 30 centimetres free
space below the fan, remove the fan-gas
valve unit by unscrewing the 4 fan fastening
nuts. If the space is greater, this is not
necessary, and the entire unit can be
removed together with the burner
assembly hexagonal support base (see
following points).
8. Progressively unscrew the 3 fastening nuts
"L". Once removed, the unit "M" - burner
assembly, electrodes, hexagonal support
base - can be removed from the boiler
body as indicated in the series of images
23d - 23g. Intervene with care, avoiding
excessive force on the fins of the hexagonal
support base if the gasket "K" opposes
resistance due to deposits. Some drops of
water or residues may by released; avoid
where possible having these come into
contact with the electrical parts.
30
E
F
A
Fig. 23a
Fig. 23b
ARENA 30 A
L
G
H
B
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