Checking The Temperature; Setting The Boiler Control Function Modes - Biasi Activ A 12OV Service Manual

Some of these devices are directly accessible by the
user (function control, temperature adjustment etc.)
others, like the fuses, are accessible by removing the
main electronic p.c.b. lid.
13
12
11
10
Fig. 6.2
1 Connector --- ignition electrode.
2 Connector --- flame detection electrode.
3 Connector --- controler fan.
4 Connector ---c.h. return temperature probe NTC
5 Connector --- flue temperature probe NTC.
6 Connector --- external temperature probe (op-
tional).
7 Connector --- safety thermostat and c.h. flow tem-
perature probe NTC.
8 Connector --- remote control (optional).
9 Connector --- display and function control / c.h.
temperature adjustment control panel p.c.b.
10 Fuse F1, F2 2A F
11 Connector --- electric supply Main electronic con-
trol/ignition p.c.b.
12 Connector --- electric supply control panel p.c.b.
13 Connector --- gas valve, external pump and fan.
6.3

Checking the temperature

The Main electronic control/ignition p.c.b. makes it
possible adjust the c.h. water flow 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-
trol panel p.c.b. key
If the power requested is lower than 40% of the maxi-
mum power output then control is achieved by switch-
ing ON the burner at minimum power, then switching
OFF (ON/OFF function). If the power requested is
higher, then the burner is switched ON at maximum
power and will control by modulating to 40% of the
maximum power output.
1 2 3 4 5
9
During the c.h. operation (Fig. 6.3), the signal coming
from the c.h. temperature probe is compared to the sig-
nal given by the control panel p.c.b. through the adjust-
ment made by the user (key
such a comparison operates the fan speed thus regu-
lating the gas flow rate and consequently changing the
useful output of the boiler.
6
7
8
Fig. 6.3
The control sequences in c.h. function are illustrated in
detail in section 6.7.
6.4

Setting the boiler control function modes

It is possible to select the various boiler control function
modes hereafter named "parameters" by using the
keys of the control panel p.c.b.
Fig. 6.4
1 To enter in the parameters setting mode press
contemporary the 3 keys (A --- B --- C Fig. 6.4) for
10 second until the display shows Fig. 6.5
Main electronic control/ignition p.c.b.
). The result of
A
B
C
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