68
– loosen the clips (6) and extract the air inlet pipe (7)
– unscrew the swivel joint (8)
– extract the connectors (9) from the fan and disconnect the
electrode cable (10)
8
6
6
7
9
10
8
Fig. 148
– Unscrew the four nuts (11) securing the combustion chamber
door (12)
– pull the fan-sleeve-door assembly (13) forwards and remove
it.
12
11
13
11
Fig. 149
m
CAUTION
Work carefully when removing the assembly (13) to pre-
vent any damage occurring to the internal insulation of
the combustion chamber and the door seal.
8.3.2
Cleaning the burner and the combustion cham-
ber
The combustion chamber and the burner do not require any
particular maintenance. Simply brush them with a soft brush.
8.3.3
Checking the ignition/detection electrode
Check the state of the ignition/detection electrode and replace if
necessary. Check the measurements as per the drawing wheth-
er the ignition/detection electrode is replaced or not.
6
+0,5
-0,5
4,5
+0,5
-0,5
Fig. 150
8.3.4
Final operations
After having cleaned the combustion chamber and the burner:
– remove any carbon residue
– check that the seal and the insulation of the door (12) to the
combustion chamber are integral. Replace if necessary
– refit the assembly by carrying out the same operations for re-
moval but in the reverse order and tighten the screws (11) of
the door to the combustion chamber
– reconnect the connections to the fan and the electrode.
8.4
Checks
8.4.1
Checking the smoke duct
It is recommended that the user checks that the combustion air
inlet duct and smoke outlet duct are integral and airtight.
8.4.2
Checking the expansion vessel pressure
It is recommended that the expansion vessel on the water side
is drained and that the prefilling pressure is not less than
1 bar
.
If this is not the case, pressurize it to the correct value (see sec-
Once the checks described above have been completed:
– refill the boiler as described in section "
"
– check that the siphon has been filled correctly
– Start the boiler, activate the "
carry out a smoke analysis and/or measure the combustion
efficiency
– refit the front panel securing it with the two screws which
were removed previously.
