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PARAMETER
DIGIT VALUES
C.H. flow temperature
Pr 25 25÷85 (factory set 45 °C)
in antifreeze protection
mode °C
Maximum temperature
Pr 26 65÷75 (factory set according
at main exchanger
outlet in D.H.W. pre-
heating mode °C
C.H. minimum setpoint
Pr 27 25÷45 (factory set 25 °C)
Pr 28 00 ÷ 48 (= months)
Maintenance intervals
Presence of domestic
Pr 29 00 = No NTC probe (factory
cold water temp.
probe or set of inlet cold
water with solar control
Correct pressure C.H.
Pr 30 05 (0,5 bar) ÷ 15 (1,5 bar)
system
Tab 9.1
9 .5 Checks
Check that the fuses are complete
If the Main electronic control/ignition p.c.b. does not supply any
device (pump, fan, etc.) check that the fuses 10 (Figure 9.2) are
complete.
If a fuse has blown replace it with one that has the same charac-
teristics after having identified the reason for failure.
Lock sequence
Start the boiler until the burner is ignited.
With the burner firing, interrupt the gas supply. The Main elec-
tronic control/ignition p.c.b. must carry out four complete ignition
cycles and then, after about 4 minutes, goes to lock-out state.
Switch off and on the electricity supply to the boiler, by means of
the fused spur isolation switch, the device must not unlock and
the burner must not turn on.
9 .6 Removal of the electronic control p .c .b
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
When replacing the Main electronic control/ignition p .c .b .
all parameters must be correctly checked / adjusted accord-
ingly with the values noted in table in the installation manual
see chapter COMMISSIONING section: Setting record (for
information on parameters see also section "9 .4 Setting the
boiler control function modes" on page 22) .
1 Remove all the body panels (see section "2.2 Case panels"
on page 5).
2 Gain access to the parts located inside the Main electronic
p.c.b. box as explained in the section "2.4 Main electronic
p.c.b. box" on page 6 of this manual.
3 Remove all the wiring connected to the Main electronic con-
trol/ignition p.c.b.
4 Delicately flex the hooks "D" in the directions indicated (Fig-
ure 9.12) in order to release the circuit from the box.
5 Remove the Main electronic control/ignition p.c.b.
- 24 -
MAIN ELECTRONIC CONTROL/IGNITION P.C.B.
to Pr 01)
(factory set 12 months)
set)
01 = Yes NTC probe
04 ÷ 45 (°C) temp.
NTC inlet probe with solar
control
factory set 10 (=1 bar)
D
Figure 9 .12
6 Re-assemble the Main electronic control/ignition p.c.b. fol-
lowing the removal procedures in the reverse order.
Important
When re-assembling the Main electronic control/ignition p.c.b.:
7 It is not necessary to utilise static protections but it is advis-
able to ensure that the p.c.b. is handled with care and held at
the edges and with clean dry hands.
Attention
After installing the Main electronic control/ignition p.c.b. properly
set the parameters.
Warning: After cleaning or replacement as detailed
above, it is deemed necessary to undertake a com-
bustion analysis as detailed in section "11 .3 Adjust-
ment" on page 30 .
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