29
table 1
table 2
table 4
table 5
MAXIMUM NUMBER OF
FAN ROTATIONS
METHANE
GAS (G20)
LIQUID GAS
(G31)
Unica i28 heating - DHW
45 - 61
45 - 61
rpm
Unica i32 heating - DHW
49 - 60
48 - 59
rpm
Unica i36 heating - DHW
52 - 61
50 - 60
rpm
MINIMUM NUMBER OF
FAN ROTATIONS
METHANE
GAS (G20)
LIQUID GAS
(G31)
Unica i28 - i32 - i36
12
15
rpm
Max. CO
2
METHANE
GAS (G20)
LIQUID GAS
(G31)
Unica i28 - i32 - i36
9.0
10.0
%
table 3
SOFT LIGHT FAN
SPEED
METHANE
GAS (G20)
LIQUID GAS
(G31)
Unica i28
33
33
rpm
Unica i32
37
37
rpm
Unica i36
33
33
rpm
Min. CO
2
METHANE
GAS (G20)
LIQUID GAS
(G31)
Unica i28 - i32 - i36
9.0
10.0
%
By turning the heating selection knob, the monitor au-
tomatically shows the number of rotations, expressed
in hundreds (e.g. 25 = 2,500 rpm).
GAS VALVE CALIBRATION
- Connect the boiler to the power supply
- Open the gas tap
- Set the function selector to
(OFF/RESET) (monitor off)
- Remove the screws (E), remove the casing, remove the re-
taining screw below the control fascia then lower the fascia
towards you (
fi
g. 24)
- Loosen the
fi
xing screws on the cover (F) to access the ter-
minal board
- Press the CO button
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows “ACO”. The boiler operates at maximum
heat output.
The “combustion analysis” function remains active for a limit-
ed 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
distribution 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 maxi-
mum domestic hot water output (table 1)
- Check the CO2 value: (table 4) 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 out-
put (table 2)
- Check the CO2 value: (table 5) 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
fl
ue gas probe and re
fi
t the plug
- Close the instrument panel and re
fi
t the housing.
The “combustion analysis” function is automatically deactivat-
ed if the board triggers an alarm. In the event of a fault during
the combustion analysis cycle, carry out the reset procedure.
The boiler is supplied with the adjustments shown in the table. Depending
on plant engineering requirements or regional
fl
ue gas emission limits it is,
however, possible to modify this value, referring to the graphs below.
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
(p
p
)
COs.a. curve (Qnheating)
Heat output (kW)
800
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
5600
6000
6400
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
HTG curve (Qnheating)
Heat output (kW)
Fan rotations (rpm)
CO emissions s.a. (p.p.m.)
Unica i28
COs.a. curve (Qnheating)
Heat output (kW)
HTG curve (Qnheating)
Heat output (kW)
Fan rotations (rpm)
CO emissions s.a. (p.p.m.)
Unica i32
0
10
20
30
40
50
60
70
80
90
00
10
20
30
40
50
60
70
80
90
00
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
800
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
5600
6000
6400
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34