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

1 2 3 4 5
20 19 18 17 16
figure 9 .2
1 x7 - x16 connector - electric supply terminal block and exter-
nal controls terminal block.
2 Fuse F1, F2 3,15 A F
3 Fuse F3, 400 mA T
4 x15 connector - flame detection electrode
5 x12 connector - pump and 3 way diverter valve
6 x17 connector - gas valve
7 x14 connector - external temperature probe (optional)
8 x9 connector - safety thermostat, flue temperature probe
NTC, c.h. temperature probe NTC
9 x11 connector - d.h.w. temperature probe
10 x10 connector - d.h.w. flow switch
11 x13 connector - remote control (optional)
12 x2 connector - timer
13 Lock-out signal lamp
14 Boiler reset button
15 Function control / C.h. temperature adjustment
16 x22 connector - fan
17 x6 connector - spark generator
18 D.h.w. temperature adjustment
19 x5 - x24 connector - transformer
20 Appliance operation lights

9 .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 (15 and 18 in Figure 9.2)
of the electronic control p.c.b.
If 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 9.3), 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 fan speed
thus regulating the gas flow rate and consequently changing the
useful output of the boiler.
- 20 -
ElEctronic control/ignition p.c.b.
6 7 8 9 10
15 14 13
11
12
figure 9 .3
When the boiler functions in d.h.w. (Figure 9.4), 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 9 .4
Normally, the result of the comparison between these two signals
directly operates the fan speed adjusting the useful output gen-
).
90 °C