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Model
Type gas
Activ A Plus 25C
Natural (G20)
Activ A Plus 30C
Propane (G31)
Activ A Plus 35C
Natural (G20)
Activ A Plus 16S
Propane (G31)
Natural (G20)
Activ A Plus 25S
Propane (G31)
To adjust the CO
% value rotate screw (B - Figure 11.2) (by rotat-
2
ing it clockwise the CO
% decreases).
2
Checking the maximum gas valve setting in domestic hot
water mode
25 Press further key G to vary again the output in chimney
sweep mode: when the display shows the letters dP that al-
ternate with the heating water temperature value (e.g.60), the
"chimney sweep function" is at maximum output in domestic
hot water mode" (Figure 11.10);
Figure 11.10
26 Open at least one hot water tap fully.
27 Allow the analyser to give a stable reading.
28 Read the CO2 % value. It should be between:
Model
Type gas
Natural (G20)
Activ A Plus 25C
Propane (G31)
Natural (G20)
Activ A Plus 30C
Propane (G31)
Natural (G20)
Activ A Plus 35C
Propane (G31)
To adjust the CO
% value rotate screw (B - Figure 11.2) (by rotat-
2
ing it clockwise the CO
% decreases).
2
29 Press keys G - H - I (Figure 11.5) at the same time again to
exit the "chimney sweep mode" and return to the previously
set boiler status (Figure 11.11)
GAS VALVE
CO
% value (range)
2
9,2 - 9,8
9,9 - 10,8
9,2 - 9,8
9,9 - 10,8
9,0 - 9,8
9,9 - 10,8
CO
% value (range)
2
9,3 - 9,9
10,0 - 10,9
9,2 - 9,8
9,9 - 10,8
9,3 - 9,9
10,0 - 10,9
C.h. / d.h.w. function
Figure 11.11
30 Switch off the boiler and turn off the hot water tap(s).
31 &ORVH WKH DLUÀXH VDPSOLQJ SRLQWV
32 $IWHU DGMXVWPHQW ¿W WKH SURWHFWLYH EUDVV SOXJ C - Figure 11.2).
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 E (Figure 11.2).
3 Measure the electrical resistance between the connector pins
of the on-off operators as illustrated in Figure 11.12.
Upper on-off operator
approx. 6400 Ω*
Lower on-off operator
approx. 920 Ω*
*at ambient temperature.
Figure 11.12
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, of this manual.
2 Disconnect the connector J (Figure 11.13).
- 35 -
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