4.7 REMOVAL OF OUTER CASING
It is possible to completely disassemble the
shell for an easy maintenance of the boiler
following these simple instructions (fig. 30):
– Remove the two screws and bracket (6)
locking the front panel to the sides.
– Pull the front panel forwards so as to
release it from the slot-in pins located on
the sides.
– Unscrew the two screws fixing the instru-
ment panel to the sides.
– Unscrew the four screws fixing the sides
to the instrument panel support.
–
Push the sides (3) and (4) upwards, sliding
them out of their slots in the frame (2).
4.8 CLEANING AND
MAINTENANCE
Carry out the cleaning of the generator in
the following way:
– Turn the main switch off to stop electric
power reaching the boiler and close the
gas feed cock.
– Remove the outer casing as described in
section 4.7.
– Remove the gas burner manifold unit
(fig. 28).
– To clean the burner, blow in a jet of air, so
as to remove any dust particles that may
have accumulated.
– Clean the heat exchanger, removing any
dust or residue from combustion.
– When cleaning the heat exchanger or
the burners, chemical products or steel
brushes MUST NOT BE USED.
–
Make sure that the tops of the burners
with the holes are free from encrustations.
– Reassemble the items removed from
the boiler, making sure to follow the cor-
rect sequence.
– Check the chimney to make sure that
the flue is clean.
– Check operation of the main burner.
– After assembly of all the gas connec-
tions, these must be tested for sound-
ness, using soapy water or appropriate
products.
DO NOT USE NAKED FLAMES.
– Do not use calcium chloride to treat the
plastic component during generator
maintenance.
Preventive maintenance and checking of
efficient operation of equipment and
safety devices must be carried out exclu-
sively by authorized technical personnel.
4.8.1 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. 31).
From that moment the boiler will start func-
tioning in heating mode at the maximum
power (20,000 kcal/ h), 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 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 primary 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.
4.9 FAULT FINDING
The burner does not ignite and the circu-
lator is working.
– Check that the water pressure reads 1 -
1.2 bar.
– The flowmeter is faulty, replace it.
86
Fig. 30
KEY
1 Self-tapping screw
2 Frame
3 L.H. side panel
4 R.H. side panel
5 Front panel
6 Fixing bracket
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