Checking The Temperature - Biasi RIVA ADVANCE HE M110B.24SM/C Service Manual

Electronic control/ignition p.c.b.
tiometers etc.) others, like the fuses, are accessible by
removing the service panel.
1 2 3 4
19 18 17 16 15
Fig. 9.2
1 x7 connector --- electric supply terminal block and
external controls terminal block.
2 Fuse F1, F2 3,15 A F
3 Fuse F3, 400 mA T
4 x12 connector --- pump and 3way diverter valve
5 x17 connector --- gas valve
6 x14 connector --- external temperature probe
(optional)
7 x9 connector --- safety thermostat, flue tempera-
ture probe NTC, c.h. temperature probe NTC
8 x11 connector --- d.h.w. temperature probe
9 x10 connector --- d.h.w. flow switch
10 x13 connector --- remote control (optional)
11 x2 connector --- timer
12 Lock ---out signal lamp
13 Boiler reset button
14 Function control / C.h. temperature adjustment
15 x22 connector --- fan
16 x24 connector --- transformer
17 D.h.w. temperature adjustment
18 x5 connector --- transformer
19 Appliance operation lights
9.3

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.
18
5 6 7 8
14 13 12
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 (14 and
9 10
17 in Fig. 9.2) of the electronic control p.c.b.
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.
During the c.h. operation (Fig. 9.3), 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
11
parison operates the fan speed thus regulating the gas
flow rate and consequently changing the useful output
of the boiler.
Fig. 9.3
When the boiler functions in d.h.w. (Fig. 9.4), 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
). The result of such a com-
).