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- Loosen the fixing screws on the cover (F) to access the terminal board
(fig. 22)
- Press the CO button (fig. 37)
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows "ACO" and the yellow LED flashes. The boiler oper-
ates at maximum heat output.
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, after removing the screws
from the cover (fig. 35)
- Press the "combustion analysis" button a second time to reach the num-
ber of rotations corresponding to the maximum domestic hot water out-
put (table 1); the yellow LED continues to flash while the red LED is fixed
- Check the CO2 value: (table 3) if the value does not match the value
given in the table, use the gas valve maximum adjustment screw
- Press the "combustion analysis" button a third time to reach the number
of rotations corresponding to the minimum output (table 2); the yellow
LED continues to flash while the green LED is fixed
- Check the CO2 value: (table 4) if the value does not match the value
given in the table, use the gas valve minimum adjustment 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
heating - DHW
table 3
Max. CO
2
The boiler is supplied with the adjustments shown in the table. Depending on plant engineering requirements or regional flue gas emission limits it is,
however, possible to modify this value, referring to the graphs below.
HTG curve (Qnheating)
6000
5600
5200
4800
4400
4000
3600
3200
2800
2400
2000
1600
1200
8
12
16
20
Heat output (kW)
METHANE
LIQUID GAS
GAS (G20)
(G31)
58
57
METHANE
LIQUID GAS
GAS (G20)
(G31)
9,0
10,0
24
28
32
36
40
RANGE RATED
This boiler can be adapted to the plant's thermal need, in fact, the maxi-
mum flow rate can be set for the boiler's heating function:
- Disconnect the power supply to the boiler.
- Turn the heating water temperature selector to the maximum value
- Lift and rotate the control panel towards you
- Remove the cover by releasing the fixing hooks.
- Insert jumper JP1 (fig. 50)
- Put the power to the boiler on.
The three LEDs on the control panel flash alternately and an "ADJ" mes-
sage is shown on the display for about 4 sec, after which the maximum
heating value can be changed using the heating temperature selector and
CO button (fig. 37) to set and confirm the required value. The display shows
the icon
. End the procedure by removing jumper JP1 to save the values
set in the memory.
Once the required (maximum heating) power is set indicate the value
on the instruction manual (see back cover). For subsequent checks and
adjustments, see the value set. Setting does not switch on the boiler. When
the heating setpoint selector knob is turned the display automatically shows
the number of rpm expressed in hundreds (e.g. 25 = 2500 rpm).
table 2
MINIMUM NUMBER OF
FAN ROTATIONS
rpm
table 4
Min. CO
2
%
200
190
180
44
48
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
8
12
16
METHANE
LIQUID GAS
GAS (G20)
13
METHANE
LIQUID GAS
GAS (G20)
9,5
COs.a. curve (Qnheating)
20
24
28
32
Heat output (kW)
(G31)
16
rpm
(G31)
10,0
%
36
40
44
48
11
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