Adjustment Of Useful C.h. Output - Biasi RIVA COMPACT M90E.24S Service Manual

the timer selector switch and room thermostat, if
fitted, are set to "heat demand".
Run the boiler in c.h. mode (do not open any
d.h.w. tap).
E B
Fig. 10
5 Keep pressed the reset button C for about 10 sec-
onds until the lock ---out signal lamp D blinks.
Fig. 11
6 The lamps E should give the indication as in
Fig. 11 --- Fig. 12. If not, press the reset button re-
peatedly to obtain it.
Where:
Fig. 12
7 Keep pressed the reset button C for about 5 sec-
onds until the lock ---out signal lamp D is switched
OFF.
The boiler runs in c.h. mode and the lamps E give
the indication as in Fig. 13.
Where:
Fig. 13
8 Rotate the knob B on a position corresponding to
an adequate ignition pressure.
Refer to the value indicated in the tables of the
User/Installation manual (Technical information
section, Gas pressures at the burner table).
By rotating clockwise the pressure increases.
9 Make a note of the position of the knob B.
10 Turn the boiler OFF and ON positioning the func-
tion selector knob A as indicated in Fig. 14
A C D
ON
LD1 LD2 LD3
E
Lamp OFF
Lamp ON
Lamp OFF
Flashing lamp, alone
or simultaneously
with an other lamp.
Electronic starting control p.c.b.
E B
Fig. 14
11 Keep pressed the reset button C for about 10 sec-
onds until the lock ---out signal lamp D blinks.
12 Press the reset button C repeatedly (4 times) until
the lamps E give the indication as in Fig. 15 (igni-
tion pressure adjustment mode).
Where:
Fig. 15
13 Turn the knob B to the minimum (fully counter-
clockwise) and then on the position correspon-
ding to the position obtained on step 8.
By turning the knob B, the lock ---out signal lamp
D blinks quickly (2 per second) indicating that the
setting has changed and must be memorised.
14 To memorize the setting keep pressed the reset
button C for about 5 seconds until the lights E
briefly blinks simultaneously.
15 To reset the boiler to the normal operation turn it
OFF and ON by the function selector knob A
checking the ignition pressure and that the
burner lights up uniformly. In any case, the boiler
automatically resets to its normal operation after
10 minutes.
9.8

Adjustment of useful c.h. output

This adjustment does not influence the maximum use-
ful output delivered during the d.h.w. operating mode.
1 Turn the boiler OFF.
2 Remove the front panel of the case.
3 Open the gas valve outlet pressure test point (8,
see section 10.2) and connect the gauge.
4 Turn the boiler ON positioning the function selec-
tor knob A as indicated in Fig. 16 and ensure that
the timer selector switch and room thermostat, if
fitted, are set to "heat demand".
Run the boiler in c.h. mode (do not open any
d.h.w. tap).
E B
Fig. 16
A
C D
Lamp OFF
Lamp ON
A C D
17