27
The “combustion analysis” function remains active for a limited
time (15 min); if a delivery temperature of 90°C is reached, the
burner is switched off. It will be switched back on when this
temperature drops below 78°C.
- Insert the analyser probe in the ports provided in the air distri-
bution box, after removing the screws from the cover.
- Press the “combustion analysis” button a second time to
reach the number of rotations corresponding to the maximum
domestic hot water output (
table 1
).
- Check the CO
2
value: (
table 4
) if the value does not match
the value given in the table, use the gas valve maximum ad-
justment screw.
- Press the “combustion analysis” button a third time to reach
the number of rotations corresponding to the minimum output
(
table 2
).
- Check the CO
2
value: (
table 5
) if the value does not match
the value given in the table, use the gas valve minimum ad-
justment screw.
- To exit the “combustion analysis” function, turn the control
knob.
- Remove the flue gas probe and refit the plug.
- Close the instrument panel and refit the housing.
The “combustion analysis” function is automatically deactivated
if the board triggers an alarm. In the event of a fault during the
combustion analysis cycle, carry out the reset procedure.
table 1
MAXIMUM NUMBER OF
FAN ROTATIONS
NATURAL
GAS (G20)
LPG
(G31)
25A: Heating-DHW
49 - 61
49 - 61
rpm
29A: Heating-DHW
53 - 62
52 - 60
rpm
32A: Heating-DHW
53 - 69
52 - 67
rpm
table 2
MINIMUM NUMBER OF
FAN ROTATIONS
NATURAL
GAS (G20)
LPG
(G31)
14
14
rpm
table 3
SOFT LIGHT FAN SPEED
NATURAL
GAS (G20)
LPG
(G31)
40
40
rpm
table 4
Max. CO
2
NATURAL
GAS (G20)
LPG
(G31)
9.0
10.5
%
table 5
Min. CO
2
NATURAL
GAS (G20)
LPG
(G31)
9.5
10.5
%
7.10.1 CHECKING THE FAN SPEED
Locate the CO button (see Fig 44 pos
SW1
).
Select the main selector switch to the ON position, press the
CO button once, the display will then scroll through the fan
speeds along with the relevant icon.
7.10.2 THERMOREGULATION
To set the temperature regulation curve, locate potentiometer
(P3). By turning (P3), the curve is shown on the LCD display.
The user can adjust the temperature of the heating system
indirectly by changing the required room temperature from
between 15°C & 25°C, this will allow the PCB to recalculate
the system temperature required, the default temperature for
calculating the curve is 20°C.
The graph below can be used to determine the correct curve
setting.
REFERENCE
TEMPERATURE 15 °C
REFERENCE
TEMPERATURE 20 °C
REFERENCE
TEMPERATURE 25 °C
20 °C
25 ° C
15 °C
10
20
30
40
50
60
70
80
90
-20
-15
-10
-5
0
5
10
15
20
25
30
ROOM TEMPERATURE CURVE OFFSET
DELIVER
Y TEMPERA
TURE
(°C)
EXTERNAL TEMPERATURE (°C)
Fig. 46
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
5600
6000
6400
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
G
ir
i v
en
ti
la
to
re
(r
.p
.m
.)
Portata termica (kW)
Curva portata termica - giri ventilatore
Qm
Qn
RANGE RATED
The boiler is supplied with the adjustments shown in the table. Depending on
plant engineering requirements or regional flue gas emission limits it is, how-
ever, possible to modify this value, referring to the graphs below.
HTG curve (Qnheating) - 25A
Heat output (kW)
Fan rotations (rpm)
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
5600
6000
6400
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
G
ir
i v
en
ti
la
to
re
(r
.p
.m
.)
Portata termica (kW)
Curva portata termica - giri ven
ti
latore
Caldaia Compact 29A
Qm
Qn
RANGE RATED
HTG curve (Qnheating) - 29A
Heat output (kW)
Fan rotations (rpm)
HTG curve (Qnheating) - 32A
Heat output (kW)
Fan rotations (rpm)
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
5600
6000
6400
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Qm
Qn
RANGE RATED
