36
7.7
Checks
7.7.1 Chimney sweep function
The chimney sweep function is used by the qualified
maintenance technician to check the mains gas pressure,
detect the combustion parameters and to measure the
combustion efficiency. 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
1
2
Fig. 35
– 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
3
a
b
5
4
Fig. 36
– isolate the gas cock
– loosen the screw of the "mains pressure" point (6) and
connect a pressure gauge
6
Fig. 37
– open the gas cock
– power the boiler by setting the main switch to "ON"
– press the button
y
for at least 1 second until "SUMMER"
mode
l
has been selected
– press and hold down the buttons
<
and
>
at the same
time for approximately 10 seconds until the message “Hi”
appears on the display together with the flashing symbols
l
and
n
– 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.
– press the button
<
to make the boiler operate at minimum
power "Lo". The message “Lo” will appear on the display
together with the flashing symbols
l
and
n
