Checking The Temperature - Biasi Riva Plus HE M296.24SM/C Service Manual

1 2
14
13
12 11 10
figure 10.2
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 sepa-
rately adjust the c.h. water flow temperature and d.h.w. outlet
temperature.
The temperature of the water is converted into an electric signal
by means of temperature probes.
The user, setting the desired temperature with the control panel
knobs operates the variable elements (10 and 11 in Figure 10.2)
of the electronic control p.c.b.
I
f the power requested is lower than 40% of the maximum power
output then control is achieved by switching 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 (Figure 10.3), the signal coming from
the c.h. temperature probe is compared to the signal given by
the control panel through the adjustment made by the user (knob
). The result of such a comparison operates the modulation
of the gas valve, consequently changing the useful output of the
boiler.
ElECTRoNiC CoNTRol/iGNiTioN P.C.b.
3 4 5 6
9 8 7
figure 10.3
When the boiler functions in d.h.w. (Figure 10.4), the signal com-
ing from the d.h.w. temperature probe is compared with the sig-
nal given by the control panel through the adjustment made by
the user (knob ).
figure 10.4
75°C
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