98
4.4
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.
4.5
REMOVAL OF
OUTER CASING
It is possible to completely disassemble
the shell for an easy maintenance of the
boiler following these simple instructions
(fig. 27):
– Pull the front panel (5) 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 upwards, sliding them out
of their slots.
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. 28).
4.6.1
Cleaning the
“Aqua Guard” filter
(fig. 28/a)
To clean the filter, close the delivery/return
on/off taps, turn off the power to the con-
trol panel, remove the casing and empty the
boiler using the drain provided. Place a con-
tainer for collection underneath the filter
and proceed to clean the filter, removing
impurities and limestone deposits. Check
the seal o-ring before reassembling the cap
with the filter.
Fig. 27
KEY
1
Self-tapping screw
2
Rear panel
3
L.H. side panel
4
R.H. side panel
5
Front panel
Fig. 28
Fig. 28/a
