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vate the function.
Figure 11 .13
28 Press F (Figure 11.4) to exit "programming mode" (Figure
11.14).
Figure 11 .14
29 Allow the analyser to give a stable reading.
30 Read the CO
% value. It should be between:
2
Model BASICA
Type gas
COND 24C
Natural (G20)
COND 28C
Propane (G31)
COND 32C
If the two values do not coincide, turn the RQ maximum adjust-
ment screw (6 in Figure 11.2) for the gas valve and calibrate the
CO
to the same value specified in the table above.
2
After setting the CO
Q .nom .), CO
at the minimum (CO
2
be checked .
31 To exit the chimney sweeper, reset parameter P06 to 00 or
wait 15 minutes with the boiler off (OFF).
32 Close the domestic hot water cocks.
33 Turn the boiler off by pressing "F" (Figure 11.4) until the mes-
sage OFF appears on the LCD display (Figure 11.15).
Figure 11 .15
Important: after the gas pressure checks and any adjust-
ment operations, all of the test points must be sealed .
11 .4 Checks
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
Check the on-off operators coils
1 Remove the front panel of the case.
2 Disconnect the electrical connector "2" (Figure 11.2).
3 Measure the electrical resistance between the connector pins
of the on-off operators as illustrated in Figure 11.16.
- 32 -
GAS VALVE
RESET
bar
RESET
bar
CO
% value (range)
2
9,0 - 9,6
10,2 - 10,8
to the maximum (CO
2
at Q .min .) must
2
RESET
bar
Upper on-off operator
approx. 6400 *
Lower on-off operator
approx. 920 *
*at ambient temperature.
Figure 11 .16
11 .5 Removal of the gas valve
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front panel of the case as explained in the sec-
tion "2.3 Control panel" on page 5, of this manual.
2 Disconnect the connector "8" (Figure 11.17), see also con-
nector "2" (Figure 11.2).
at
2
Figure 11 .17
3 Turn off the gas supply and disconnect the gas isolation cock
connector from the inlet port of the gas valve.
4 Unscrew the connector "10" (Figure 11.17) and remove the
pipe "7".
5 Unscrew the screws "9" and remove the valve (Figure 11.17).
6 Reassemble the valve carrying out the removal operations in
reverse order.
Warning: Be careful not to damage the OR gasket of
the gas pipe when inserting the pipe in the air box
(air/gas mixer) .
Before fitting a new valve, it is advisable to preset it as fol-
7
10
8
9
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