3.7 Checks and adjustments
3.7.1 Chimney sweep function
The chimney sweep function is used by the qualified main-
tenance technician to check the gas pressure at the nozzles,
detect the combustion parameters and to measure the com-
bustion efficiency required by legislation in force.
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
Fig. 32
– 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
Fig. 33
– 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 pres-
sure gauge
6
7
Fig. 34
– open the gas valve
– power the boiler by setting the main switch to "ON"
ON
Fig. 35
– press the button
y
until "SUMMER" mode
l
has been
selected
– press and hold down the buttons
<
and
>
at the same time
for approximately 5 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 gas pressure values on the
pressure 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
pressure gauges correspond to those indicated in the table
below. The message
“Lo”
will appear on the display togeth-
er with the flashing symbols
l
and
n
To Next Page
Loading...
