65
6.7
Checks
6.7.1
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 front panel has not already been removed, open the two
catches (1), unscrew the two screws (2), pull the front panel
(3) forwards and release it from the top by lifting it.
3
2
1
2
Fig. 156
– remove the screws (4) securing the control panel (5)
– move the panel (5) upwards (a) but keeping it in the side
guides (6) to the end of travel
– bring it forwards and down (b) until it is horizontal
a
b
6
5
4
Fig. 157
– isolate the gas cock
– loosen the screw of the "mains pressure" point (7) and con-
nect a pressure gauge
7
Fig. 158
– open the gas cock
– power the boiler by setting the main switch to "ON"
ON
Fig. 159
– 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 to-
gether with the flashing symbols
l
and
n
