Checking The Temperature - Biasi M96A.24SM/B Service Manual

tiometers etc.) others are accessible by removing the
service panel or the control panel lid.
1
2
14
13
12 11 10
Fig. 2
1 x1 connector
2 x6 connector
3 x7 connector
4 x4 connector
5 x2 connector
6 x15 connector
7 x11 connector
8 Lock ---out signal lamp
9 Boiler reset button
10 Function control / C.h. temperature adjustment
11 D.h.w. temperature adjustment
12 Appliance operation lights
13 x8 connector
14 Fuse 3,15 A F
10.3

Checking the temperature

The Electronic control/ignition p.c.b. makes it possible
to separately 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-
trol panel knobs operates the variable elements (10 and
11 in Fig. 2) of the electronic control p.c.b.
3 4 5
9 8 7
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
6
higher, then the burner is switched ON at maximum
power and will control by modulating to 40% of the
maximum power output.
During the c.h. operation (Fig. 3), the signal coming
from the c.h. temperature probe is compared to the sig-
nal given by the control panel through the adjustment
made by the user (knob
comparison operates the modulation of the gas valve,
consequently changing the useful output of the boiler.
Fig. 3
When the boiler functions in d.h.w. (Fig. 4), the signal
coming from the d.h.w. temperature probe is compared
with the signal given by the control panel through the
adjustment made by the user (knob
Electronic control/ignition p.c.b.
). The result of such a
).
19