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GAS VALVE CALIBRATION
- Connect the boiler to the power supply.
- Open the gas tap.
- Set the function selector to
- Loosen the screws (E), remove the housing, then lower the instrument
panel towards you (fig. 20).
- 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
operates 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
number of rotations corresponding to the maximum domestic hot water
output (table 1); the yellow LED continues to flash while the red LED is
fixed.
- Check the CO
value: (table 3) if the value does not match the value
2
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 CO
value: (table 4) if the value does not match the value
2
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.
RANGE RATED
This boiler can be adapted to the plant's thermal need, in fact, the maximum
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"
message 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).
4.8 Gas conversion
Conversion from a family gas to other family gas can be performed easily
also when the boiler is installed.
This operation must be carried out by professionally qualified personnel.
The boiler is designed to operate with methane gas (G20) according to the
product label.
It is possible to convert the boiler to propane gas, using the special kit.
For disassembly, refer to the instructions below:
- remove power supply from the boiler and close the gas tap
- loosen the three fixing screws of the upper cover, and the two lower screws
that fix the casing
- remove the cover and casing
- remove the gas train (A) - fig. 34
- remove the nozzle (B) - fig. 34 - contained in the gas train, and replace it
with the one supplied
- reassemble the gas train
- re-power the boiler and turn on the gas tap.
Conversion must be carried out by qualified personnel.
After conversion, adjust the boiler again (observing the "Adjust-
ments" section) and apply the new identification label contained
in the kit.
(OFF/RESET) (monitor off).
Table 1
Methane gas
Maximum number
of fan rotations
Table 2
Methane gas
Minimum number
of fan rotations
Table 3
Methane gas
Max CO
2
Table 4
Methane gas
Min CO
2
Table 5
Methane gas
Slow ignition
The boiler is supplied with the adjustments shown in the table. De-
pending on plant engineering requirements or regional flue gas emis-
sion 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
COs.a. curve (Qnheating)
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
8
12
16
20
Liquid gas
(G20)
(G31)
58
57
Liquid gas
(G20)
(G31)
13
16
Liquid gas
(G20)
(G31)
9,0
10,0
Liquid gas
(G20)
(G31)
9,5
10,0
Liquid gas
(G20)
(G31)
30
30
24
28
32
36
40
Heat output (kW)
24
28
32
36
40
Heat output (kW)
ENGLISH
rpm
rpm
%
%
rpm
44
48
44
48
11
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