–Unscrew the four lower screws that fix
the sides to the support control panel
and the two screws that fix it to the
upper bracket (7). Push the sides (3) and
(4) upwards freeing them from the not-
ches in the frame (2).
4.7
CLEANING AND
MAINTENANCE
Carry out the cleaning of the generator in
the following way:
–Remove the electricity supply to the boi-
ler and close the gas supply tap.
–Disassembly the casing as described in
point 4.6.
–Disassembly the burner - gas manifold
group (fig. 32).
–Clean direct a stream of air towards the
inner part of the burner to blow out any
dust that has accumulated.
–Then clean the heat exchanger removing
dust and combustion deposits.
–In cleaning the heat exchanger and that
of the burner, chemical products or steel
brushes must never be used.
–Make sure that the top perforated part
of the burners is free of encrustations.
–During the assembly and disassembly of
t he bur ner it is r ecommended t hat
attention be paid to the ignition and
detection electrodes.
–Reassemble the parts removed from the
boiler, observing the succession of the
phases.
–Check the functioning of the main burner.
–After the assembly all the gas connec-
tions must be checked for the seal, using
soapy water or specific products, avoi-
ding the use of naked flames.
Preventive maintenance and checking of
efficient operation of equipment and
safety devices must be carried out exclu-
sively by authorized technical personnel.
4.7.1
Chimney sweep function
To carry out the verification of combustion
in the boiler turn the selector and stop on
the position ( ) until the green/ orange led
starts to flash intermittently (fig. 34).
From that moment the boiler will start func-
tioning in heating mode at the maximum
power (20,000 - 25,000 kcal/ h), with swit-
ching off at 80°C and restarting at 70°C.
Before activating the chimney sweep func-
tion make sure that the radiator valves or
eventual zone valves are open.
The test may be carried out also during hot-
water service functioning.
To do so it is enough, after having activated
the chimney sweep function, to take some
hot water from one or more cocks. Even in
this condition the boiler functions at the
maximum temperature always with the pri-
mary 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, or once the hot
water request has been fulfilled, the
chimney sweep function automatically
deactivates.
4.8
FAULT FINDING
The burner does not light up and the cir-
culator functions.
–Check that the water pressure is on a
value of 1 - 1.2 bar.
–The water pressure switch is faulty and
needs to be replaced.
The main burner does not start either in
the hot water or heating drawing.
–Check and eventually replace the water
pressure switch.
–If the smoke stat has intercepted, then
reinstate it.
–Check that the coils of the gas valve are
receiving electricity, check the functio-
ning and eventually replace it.
– Check the functioning of the limit stat of
the smoke pressure switch (vers.
“BF”
).
–The fan works but at a reduced number
of turns and not activating the smoke
manostat, it is necessary to replace it
(vers.
“BF”
).
–Replace the electronic board.
The boiler starts up but after 10 seconds
it blocks.
–Check that in the electrical connection
the positions of phase and neutral have
been respected.
–The ignition/detection electrode is faulty;
90
2
3
1
4
1
5
1
6
7
Fig. 33
KEY
1
Screws
2 Frame
3 Left side
4
Right side
5 Front panel
6 Side panel
7 Upper bracket
SPIA LAMPEGGIANTE
VERDE/ARANCIO
Fig. 34
FLASHING
GREEN/ORANGE LED
