Checks; Removal Of The Electronic Control P.c.b - Biasi Activ A 25C Service Manual

Main electronic control/ignition p.c.b.
PARAMETER
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
C.h. minimum set-
point
Tab. 9.1
9.5

Checks

Check that the fuses are complete
n
If the Main electronic control/ignition p.c.b. does not
supply any device (pump, fan, etc.) check that the
fuses 10 (Fig. 9.2) are complete.
If a fuse has blown replace it with one that has the same
characteristics after having identified the reason for fail-
ure.
Lock sequence
n
Start the boiler until the burner is ignited.
With the burner firing, interrupt the gas supply. The
Main electronic 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
electricity supply before removing any
covering or component.
When replacing the Main electronic control/ignition
p.c.b. all parameters must be correctly checked /
adjusted accordingly with the values noted in table
in the installation manual see chapter COMMIS-
SIONING section: Setting record (for information on
parameters see also section 9.4).
1 Remove all the body panels (see section 2.2).
2 Gain access to the parts located inside
electronic p.c.b. box
2.4 of this manual.
Remove all the wiring connected to the Main elec-
3
tronic control/ignition p.c.b..
22
DIGIT VALUES
Pr 19
Pr 20
Pr 21
Pr 22
Pr 23
Pr 24
Pr 25
Pr 26
Pr 27 25 ÷ 45 (factory set
25 ˚C)
the Main
as explained in the section
4 Delicately flex the hooks D in the directions indi-
cated (Fig. 9.12) in order to release the circuit
from the box.
5 Remove the Main electronic control/ignition
p.c.b..
D
Fig. 9.12
Re---assemble the Main electronic control/igni-
6
tion p.c.b. following the removal procedures in
the reverse order.
Important
When re---assembling the Main electronic control/igni-
tion p.c.b.:
7 It is not necessary to utilise static protections but
it is advisable to ensure that the pcb 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, if it deemed necessary to
undertake a combustion analysis, refer to
the appropriate chapter Maintenance of the
installation instructions manual.
D