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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
-4
6
Ignition Gas Pressure Adjustment
By using the device "I" (Figure 1) marked “ACC.",
it is possible to adjust the gas pressure at the
injectors in the ignition phase.
This pressure is maintained at the injectors until
ignition occurs (ionization signal).
To carry out the adjustment move the function
selector 3 to the OFF position (Figure 7) and use
the adjustment device "I" (ACC).
Adjust the gas pressure at the injectors to the
value indicated in the tables of the
User/Installation manual (Technical information
section, Gas pressures at the burner table).
By rotating the device clockwise the pressure
increases.
Check the regular ignition of the burner by
turning the boiler on and off repeatedly.
After the adjustment operations bring the selector
3 back to the normal position ON in Figure 7.
7
Max C.h. Power Regulation
By using the device I (Figure 1) marked “RISC.”,
it is possible to limit the maximum useful output
delivered in c.h. function. By rotating the device
clockwise the pressure increases.
8
Anti-frost System
With the boiler turned on, the anti-frost control is
always active, which briefly starts the boiler until
shutdown at 35°C (primary circuit), so that the
temperature of the c.h. circuit does not drop
below 5°C.
The request is signalled by the LED
“F”
in Figure 1.
If there is no gas, the pump runs continuously to
keep the water from freezing.
This function is also active in standby mode.
9
Hydraulic Parts Checking System
With the boiler operating (both in winter function
and in summer function) the hydraulic parts
checking system is always active.
This system makes it possible to maintain the
efficiency of the hydraulic parts (i.e. pump) by
activating them in case of long periods of
unusing.
It is activated when the boiler is inactive for more
than 24 hours.
A)
It turns on the pump for 1 minute
10
Checks
A
Check that the fuse is complete
If the control p.c.b. does not supply any device
(pump, etc.) check that the fuse K (Figure 1) is
complete.
If the fuse has blown replace it with one that has
the same characteristics after having identified
the reason for failure.
B
Check the setting jumpers position
Two setting jumpers must be fitted on the Control
p.c.b. as shown in Figure 9.
1 2 3 4 5 6 7 8 9
Figure 9
The numbers refer to the marking printed on the
circuit board.
11
Removal of the Control p.c.b.
Warning: Isolate the boiler from the mains
electricity supply before removing
any covering or component.
1) Gain access to the parts located inside the
control panel as explained on page 1-2 of the
third part of this manual.
2) Remove all the wiring connected to the
Control p.c.b.. To disconnect the connectors
J1, J2 and J3 (A,B and J in Figure 1)
delicately flex the hook present on one side of
each socket.
3) Remove the spindles of the c.h. temperature
adjustment knob by delicately pulling it with
pliers in the direction shown by the arrow in
Figure 10.
