106
tions must be checked for the seal, using
soapy water or specific products, avoi-
ding the use of naked flames.
The maintenance or the boiler program-
med is carried out annually .
4.7.1
Disassembly the control panel
and skirt cover lid
(fig. 19)
To remove the cover, take out the screws
(1 – 2) that hold it in place on the instru-
ment panel. Position side
“A”
of the brack-
et on the skirt side so that the instrument
panel is hooked on the side in order to
facilitate this operation.
4.7.2
Chimney sweep function
To carry out the verification of combustion
in the boiler turn the selector and the stop
on the position ( ) until the yellow led (
)
starts to flash (fig. 20).
From that moment the boiler will star t
functioning in heating mode at the maxi-
mum power, with switching off at 80 °C and
restarting at 70 °C.
Before activating the chimney sweep
function make sure that the radiator val-
ves or eventual zone valves are open.
The test may be carried out also during
hot-water service functioning, when the boi-
ler part is connected.
To do so it is enough, after having activated
the chimney sweep function, to take some
hot water from one or more taps; after a
few minutes the request of the D.H.W. sen-
sor is activated dan it automatically com-
mutes on the led (
).
Even in this condition the boiler functions at
the maximum temperature always with the
primary circuit controlled between 80 °C
and 70 °C.
During the entire duration of the testing
the hot water taps must remain open.
After verifying the combustion the boiler
should be switched off by placing the selec-
tor on the
OFF
position; then return the
selector to the desired function.
ATTENTION: After about 15 minutes the
chimney sweep function automatically
deactivates.
4.8
FAULT FINDING
The principal burner burns badly: flames
too high, yellow flames.
–Check that the gas pressure to the bur-
ner is normal.
–Check that the burners are clean.
The radiators heat up also in summer.
–Check that there are no impurities on
the seat of the non-return valve.
–The non-return valve is faulty, see to its
replacement.
–Assemble a non-return valve on the plant
return tubing.
The safety valve of the boiler frequently
intercepts.
–Check that the cold filling pressure is not
too high, keep to the given values.
–Check that the safety valve is calibrated,
eventually replace it.
–Check the pre-inflation pressure of the
expansion tank.
–Replace the expansion tank.
The boiler functions but the temperature
does not increase.
–Check that the consumption of gas is not
below that foreseen.
–Check that the boiler is clean.
–Check that the boiler is proportional to
the plant.
Abnormal burner flame (fig. 17).
–Check the chimney flue draught.
–Check that the nozzle is centred in the
burner.
–Clean the cast iron exchanger and the
burner.
SPIA GIALLA INTERMITTENTE
Fig. 20
Fig. 18
Lato A
Lato A
Fig. 19
1
2
FLASHING YELLOW LED
