Checks; Removal Of The Electronic Control P.c.b - Biasi RIVA ADVANCE HE M110B.24SM/C Service Manual

1
figure 9 .20
At this step it is possible to visualize the current setting by keep-
ing the reset button 9 pressed for more than 5 seconds. The
lamps 11 will flash a number of times corresponding to the setting
of Figure 9.20 that must be seven times.
7 To reset the boiler to the normal operation turn it OFF and ON
by the function selector knob 7 checking the ignition pressure
and that the burner lights up uniformly. In any case, the boiler
automatically resets to its normal operation after 10 minutes.

9 .10 checks

Check that the fuses are complete
If the Electronic control/ignition p.c.b. does not supply any device
(pump, fan, etc.) check that the fuses 2 and 3 (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 Electronic
control/ignition p.c.b. must carry out three complete ignition cy-
cles and then, after about 3 minutes, goes to lock-out state.
By turning the boiler on and off by means of the function switch
the device must not unlock and the burner must not turn on.
9 .11 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 electronic control/ignition p .c .b . it is ad-
visable to go through the setting modes of the boiler here
described in sections 9 .5 to 9 .7 .
the spare electronic control/ignition p .c .b . is set for natural gas .
if the boiler is fed with different gas type, go through the Gas
conversion operations described in the Installation manual .
If an external temperature probe (optional) is fitted, the coef-
ficient K has also to be set as described in the Commission-
ing chapter of the installation manual .
1 Gain access to the parts located inside the control panel as
explained in the section "Control panel" page 5.
2 Remove all the wiring connected to the Electronic control/
ignition p.c.b.
To disconnect the connectors delicately flex the hook present
on one side of each socket.
- 24 -
ElEctronic control/ignition p.c.b.
D.H.W.
FLOWMETER
4
7 flashes
7
8
Setting No.
3 Remove the spindles of the c.h. and d.h.w. temperature ad-
justment knobs by delicately pulling them with pliers in the
direction shown by the arrow in Figure 9.21.
figure 9 .21
4 Unscrew the four screws that hold the Electronic control/igni-
tion p.c.b. on to the control panel.
5 Remove it by lifting its rear edge and freeing it from any of
the wiring.
6 Re-assemble the Electronic control/ignition p.c.b. following
the removal procedures in the reverse order.
important
When re-assembling the 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.
8 Fit the p.c.b. into the control panel by first inserting the front
lower edge under the control knob shafts. Lower the rear
edge and ensure that no wiring is trapped beneath.
9 Insert the spindles in the control panel knobs until the notch A
(Figure 9.22) reaches the potentiometer edge. It is not neces-
sary to force them in the knob.
10 While tightening the screws that fix the Electronic control/igni-
tion p.c.b. on the control panel, keep the p.c.b. towards the
control panel fascia making sure of the contact between the
boiler reset button B and the tab C (Figure 9.22).
a
a
figure 9 .22
b
c