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Third Part
(edition-0106)
Control p.c.b. 11.62
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RIVA
FP
SERVICE MANUAL – REV A
5
-2
D) Boiler reset button
E) Function control / C.h. temp. adjustment
F) Appliance operation lights
G) Dip-switch selectors
H) Setting jumpers
I) Ignition gas pressure adjustment (ACC.)
J) J1 connector
K) Fuse 4.0 A
3
Checking the Temperature
The control p.c.b. makes it possible to adjust the
c.h. water flow 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 knob operates the variable
element (E in Figure 1) of the 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 max power output.
Figure 2
During the c.h. operation (Figure 2), 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
in Figure 2). The result of such a comparison
operates the modulation of the gas valve,
consequently changing the useful output of the
boiler.
The control sequence is illustrated in detail in
sections 12.
4
Operation Lights
The Control p.c.b. is provided with three lamps
(L.E.D. indicators) F in Figure 1 that give optical
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.
Figure 3
With the boiler switched ON all the lamps (F in
Figure 1) are activated.
The following table gives the relationship
between each of the possible lamp combinations
and their meaning.
