76
EN
7.6 Checks and adjustments
7.6.1 Chimney sweeper function
The chimney sweeper function is used by the qualified mainte-
nance technician to check the gas pressure at the nozzles, detect
the combus
tion parameters and to measure the combustion effi-
ciency required by legislation in force.
This function las
ts 15 minut
es 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
Fig. 41
– 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
a
b
5
4
Fig. 42
– close the gas valve
– loosen the "nozzle pressure" point (6) and the screw of the
"supply pressure" point (7) and connect each one to a pressure
gauge
6
7
Fig. 43
– open the gas valve
– power the boiler by setting the main switch to "ON"
ON
Fig. 44
– 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
–
open one or more than one hot water tap
– press the button
>
to make the boiler operate at maximum
power
"Hi"
and check that the gas pressure values on the pres-
sure gauges correspond to those indicated in the table below
–
press the button
<
to make the boiler operate at minimum
power "Lo" and check that the gas pressure values on the pres-
sure gauges correspond to those indicated in the table below.
The mes
sage “Lo” will appear on the display t
ogether with the
flashing symbols
l
and
n
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