Checking The Temperature; Operation Lights - Biasi RIVA COMPACT HE MK2 M96A.24SR/C 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 Service knob
12 Appliance operation lights
13 x8 connector
14 Fuse 3,15 A F
8.3

Checking the 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 in
Fig. 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. 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
parison operates the modulation of the gas valve,
consequently changing the useful output of the boiler.
3 4 5
9 8 7
). The result of such a com-
6
Fig. 3
The control sequences in
detail in sections 8.12.
8.4

Operation lights

The Electronic control/ignition p.c.b. is provided with
three lamps (L.E.D. indicators) 12 in Fig. 2 that give op-
tical information during the operation of the boiler.
The green lamp on the left gives information whether
the boiler is in stand---by mode or during the normal
operation of the boiler.
The following table gives the relationship between the
lamp indication and its meaning.
A short pulse every 4 seconds
1 second ON 1 second OFF
With the boiler switched ON (
Fig. 2) are activated.
The following table gives the relationship between each
of the possible lamp combinations and their meaning.
Electronic control/ignition p.c.b.
function are illustrated in
Boiler in stand --- by condition.
(function control in
position).
Anti--- freeze system active.
Boiler ON condition
(function control in
position)
) all the lamps (12 in
15