87
– Turn on the boiler using the four-way
switch and turn on a hot water tap all
the way.
– Remember that rotating clockwise will
increase pressure while rotating anti-
clockwise will diminish it.
– Adjust maximum pressure using the nut
(3) with a wrench to the maximum pres-
sure value indicated in
Table 5
.
– Do not adjust minimum pressure until
you have adjusted maximum pressure.
– Turn off the supply power to the modula-
tor, and keep the hot water tap turned
on.
– Lock the nut (3) in place, turn the nut (2)
to the minimum pressure indicated in
Table 5
.
– Turn off the boiler and turn it back on
again several times, keeping the hot
water tap turned on at all times and
checking that the maximum and mini-
mum pressure values correspond to the
established values; correct the settings if
necessary.
– Adjust, checking that you have restored
the power to the modulator.
– Put the pipe back on the valve VENT
pressure test point.
– Remove the manometer, remembering
to tighten the screw for closing the pres-
sure test point.
– Put the plastic cap (1) back on the modu-
lator and seal with a drop of coloured
sealant if necessary.
NOTE: After assembly the sealing capa-
city of all the gas connections must be
tested, using soapy water and special
products, and avoiding the use of naked
flames. The conversion must be carried
out only by authorised personnel.
4.6
DISASSEMBLY OF
EXPANSION VESSEL
To disassemble the expansion vessel, pro-
ceed as follows (fig. 31):
– Make sure that the water has been emp-
tied out of the boiler.
– Unscrew the connection (1) and the lock-
nut (5).
– Remove the bracket and the expansion
vessel (4).
NOTE: Before refilling the system, using a
pressure gauge attached to the valve (3)
make sure that the expansion vessel is
preloaded at a pressure of 0.8 to 1 bar.
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. 32):
– 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, sli-
ding them out of their slots.
4.8
CLEANING AND
MAINTENANCE
At the end of each heating season, it is
essential to have the boiler thoroughly
checked and cleaned out.
Proceed as follows:
– Turn the main switch off to stop electric
Fig. 32
KEY
1
Self-tapping screw
2
Rear panel
3
L.H. side panel
4
R.H. side panel
5
Front panel
6
Fixing bracket
Fig. 31
KEY
1
Connection 3/4”
2
Expansion vessel
3
Preloaded valve
4
Fixin bracket
5
Locknut 1/2”
KEY
1
Plastic cap
2
Minimum pressure adjusting
3
Maximum pressure adjusting
Fig. 30/a
Fig. 30/b
KEY
1
Plastic cap
2
Minimum pressure adjusting
3
Maximum pressure adjusting
