44
7.6 Checks
7.6.1 Chimney sweep function
The chimney sweeper function is used by the qualified mainte-
nance technician to check the mains gas pressure, detect the
combustion parameters and to measure the combustion effi-
ciency. A combustion analysis should not be conducted until a
satisfactory inlet working pressure test has been completed.
This function lasts 15 minutes and is activated by proceeding
as follows:
– if the panel (2) has not already been removed, remove the
two screws (1), pull the front panel (2) forwards and release
it from the top by lifting it
2
1
Fig. 50
– remove the screws (3) securing the control panel (4)
– move the panel (4) upwards (a) but keeping it in the side
guides (5) to the end of travel
– bring it forwards and down (b) until it is horizontal
4
b
a
5
Fig. 51
– isolate the gas cock
– loosen the screw of the “gas mains pressure point” (6) and
connect a pressure gauge
Fig. 52
– open the gas cock
– power the boiler by setting the main switch to "ON"
ON
Fig. 53
– press button
s
and hold for at least 1 second, until you se-
lect “SUMMER” mode
l
– press the buttons
o
and
>
at the same time for approxi-
mately 10 seconds until the message flashes "Hi", on the
display alternating with the temperature of the delivery
sensor and the flashing symbols
o
and
>
– press the button
>
to make the boiler operate at maximum
power "Hi" and check that the mains gas pressure value on
the pressure gauge is correct.
– check that the gas supply pressure is as shown in the table
below
Type of gas G20 G31
Pressure (mbar) 20 37
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