22
4.5
DISASSEMBLY OF
EXPANSION VESSEL
To disassemble the expansion vessel, pro-
ceed as follows:
– Make sure that the water has been emp-
tied out of the boiler.
– Unscrew the connection and the locknut.
– Remove the expansion vessel.
Before refilling the system, using a pressu-
re gauge attached to the valve make sure
that the expansion vessel is preloaded at a
pressure of 0.8 to 1 bar.
4.6
CLEANING AND
MAINTENANCE
Preventive maintenance and checking of
efficient operation of equipment and safety
devices must be carried out exclusively by
authorized technical personnel.
During maintenance operations the
authorised technician must check that
the syphened drip is full of water
(this
check is of importance particularly when
the generator has been out of use for a long
period of time). Filling is done via the special
opening (fig. 24).
4.6.1
Disassembly the control panel
and skirt cover lid
(fig. 25)
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.
4.6.2
Chimney sweep function
To carry out the verification of combustion
in the boiler, turn the selector and stop on
the position ( ) until the orange led (
)
starts to flash intermittently (fig. 29).
From that moment the boiler will start func-
tioning in heating mode at the maximum
power, with switching 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 functioning.
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 hot-water
service feeler is activated and it automati-
cally switches on the led (
).
Even in this condition the boiler functions at
the maximum temperature always with the
primary controlled between 80°C and
70°C. During the entire duration of the test-
ing the hot water taps must remain open.
Fig. 24
Lato A
Lato A
Fig. 25
1
2
Side A
Side A