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9
Electronic control p.c.b.
9.1
Function
Inlet Information
On the Electronic control p.c.b.......
Function control*
C.h. temperature adjustment*
D.h.w. temperature adjustment*
Function dip---switches
Max. c.h. gas pressure adjustment
Ignition gas pressure adjustment
Boiler reset button*
*control panel fascia
From other boiler devices....
C.h. temperature probe NTC
D.h.w. temperature probe NTC
D.h.w. flow switch
Primary circuit flow switch
Room thermostat (if fitted)
Time switch
Flame presence signal*
*from the full sequence ignition device
Outlet command
Pump
Three way diverter valve
Full sequence ignition device
Modulation operator
Appliance operation lights*
Lock ---out signal lamp*
*control panel fascia
Fig. 27
The fundamental function of the Electronic control
p.c.b. is that of controlling the boiler in relation to the ex-
ternal needs (i.e. heating the dwelling or heating the
water for d.h.w. use) and operating in order to keep the
temperature of the hydraulic circuits constant.
This is obviously possible within the useful power and
maximum working temperature limits foreseen.
Generally, the Electronic control p.c.b. receives inlet in-
formation coming from the boiler (the sensors) or from
the outside (knobs, room thermostat, etc.), processes
it and consequently acts with outlet commands on
other components of the boiler (Fig. 27).
9.2
Selection and adjustment devices
On the Electronic control p.c.b. several selection, ad-
justment and protection devices are located. (Fig. 28).
Some of these devices are directly accessible by the
user (function control, temperature adjustment poten-
tiometers etc.) others are accessible by removing the
service panel or the control panel lid.
13
12
11
10
9
8
7
6
Fig. 28
1
J3 connector
2
J2 connector
3
Lock ---out signal lamp
4
Boiler reset button
5
Function control / C.h. temperature adjustment
6
D.h.w. temperature adjustment
7
Appliance operation lights
8
Dip---switch selectors
9
Setting jumpers
10
Ignition gas pressure adjustment (ACC.)
11
Maximum c.h. gas pressure adjustment (RISC.)
12
J1 connector
13
Fuse 1,6 A T
9.3
Checking the temperature
The Electronic control p.c.b. makes it possible to separ-
ately adjust the c.h. water flow temperature and d.h.w.
outlet temperature.
The temperature of the water is converted into an elec-
tric signal by means of temperature probes.
The user, setting the desired temperature with the con-
1
2
5
4
3
19
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