Function; Selection And Adjustment Devices - Biasi GARDA M90F.24S Service Manual

9 Electronic starting control p.c.b.
9.1

Function

Inlet Information
On the Electronic
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 light*
Operation/service lamps
Lock ---out signal lamp*
*control panel fascia
Fig. 27
starting control
The fundamental function of the Electronic starting con-
trol p.c.b. is that of controlling the boiler in relation to the
external 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 starting control p.c.b. receives
inlet information coming from the boiler (the sensors)
or from the outside (knobs, room thermostat, etc.), pro-
cesses it and consequently acts with outlet commands
on other components of the boiler (Fig. 27).
9.2

Selection and adjustment devices

On the Electronic starting control p.c.b. several selec-
tion, adjustment 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.
16
15
14
13
12
11
10
9
8
Fig. 28
1 Connector J1 electric supply terminal block
2 Fuse F1 (3,15A --- 250V)
3 Connector J3 (Pomp, three way diverter valve)
4 Connector J16 (Modulating gas valve)
5 Connector J19 (Flame detection electrode)
6 Connector J15 (Fan, Air pressure switch, Safety
thermostat)
7 Connector J20 e J21 (Ignition electrodes)
8 Lock ---out signal lamp
9 Boiler reset button
10 Function control / C.h. temperature adjustment
11 Connector J7
1
2
3
4
5
6
7
15