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/a).
4.6.1
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. 25).
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.
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.
4.7 ROUTINE SERVICING
To ensure continued efficient operation of
the appliance, it is recommended that it is
checked and serviced at regular intervals.
The frequency of service will depend on the
particular installation
and conditions of usage, but in general once
a year should be adequate.
It is the law that a competent person such
as a Gas Safe Register registered engineer,
must carry out any service work.
4.7.1 Combustion Check
Incorporated into the flue elbow or vertical
adaptor is a sampling point.
The grey plastic cap should be unscrewed
and the flue gas sampled using a flue gas
analyser.
During the test the boiler can be operated
in “chimney sweep mode” see 4.6.1.
The correct CO
2
reading can be found in
section 4.4.
4.7.2
Burner inspection
Remove the burner as described in section
5.5.
Inspect the burner and if necessary clean
using a soft brush, taking care not to dam-
age the
front insulation.
Check the Ignition/ionisation electrode,
check the gap (4mm+/- 0.5mm)
Before reassembly inspect all seals and
replace as required.
4.7.3
Combustion Chamber
Remove any loose debris from the combus-
tion chamber using a soft brush and a vac-
uum cleaner.
Take care not to damage the rear insulation
panel.
4.7.4 Condensate
Trap
The condensate trap would not normally
require removal during service, but can be
checked whilst the burner assembly is
removed.
Carefully pour water into the heat exchang-
er and check that it flows freely to the drain.
Should it require removal, firstly remove the
two wire clips securing the condensate
drain rubber pipe to the heat exchanger
and the condensate trap.
Remove the pipe.
Remove the 1/2 “ nut securing the con-
densate trap to the combustion compart-
ment.
Disconnect the drain pipe from the trap.
Clean the trap and refit in reverse order.
SPIA GIALLA INTERMITTENTE
Fig. 25
FLASHING YELLOW LED
Fig. 24/a
23
