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INSTRUCTIONS FOR FITTERS
37. TECHNICAL DATA
Boiler model NUVOLA 3 BS 40
240 i
280 i
140 Fi
240 Fi
280 Fi
Category
II
2H3+
II
2H3+
II
2H3P
II
2H3+
II
2H3+
Rated heat input
kW
27,1
31,1
15,3
26,3
30,1
Reduced heat input
kW
11,9
11,9
6,9
11,9
11,9
Rated heat output
kW
24,4
28
14
24,4
28
kcal/h
21.000
24.080
12.100
21.000
24.080
Reduced heat output
kW
10,4
10,4
6
10,4
10,4
kcal/h
8.900
8.900
5.160
8.900
8.900
Useful efficiency according to directive 92/42/CEE
–
++
++
++
+++
+++
Max. water pressure in CH system
bar
3
3
3
3
3
Storage boiler capacity
l
42
42
42
42
42
Expansion vessel capacity
l
7,5
7,5
7,5
7,5
7,5
Expansion vessel pressure
bar
0,5
0,5
0,5
0,5
0,5
DHW production at outlet ΔT=30°C
l/30min
380
440
240
380
440
DHW max. water pressure
bar
8
8
8
8
8
DHW production at ΔT=25 °C
l/min
14
16,1
8,1
14
16,1
DHW production at ΔT=35 °C
l/min
10
11,5
5,8
10
11,5
Specific output (*)
l/min
16
17,5
11,4
16
17,5
Type
—
B
11BS
B
11BS
C12 - C32 - C42 - C52 - C82 - B22
Coaxial flue duct diameter
mm
—
—
60
60
60
Coaxial air duct diameter
mm
—
—
100
100
100
2-pipe flue duct diameter
mm
—
—
80
80
80
2-pipe air duct diameter
mm
—
—
80
80
80
Flue duct diameter
mm
140
140
—
—
—
Max. flue mass flow rate
kg/s
0,022
0,024
0,015
0,017
0,018
Min. flue mass flow rate
kg/s
0,021
0,021
0,015
0,018
0,018
Max. flue temperature
°C
110
115
120
134
142
Min. exhaust temperature
°C
82
82
77
108
108
NOx Class
—
3
3
3
3
3
Gas used
—
G20
G20
G20
G20
G20
—
G30-G31
G30-G31
G31
G30-G31
G30-G31
Natural gas feeding pressure G20
mbar
20
20
20
20
20
Butane supply pressure G30
mbar
28-30
28-30
—
28-30
28-30
Propane gas feeding pressure G31
mbar
37
37
37
37
37
Power supply voltage
V
230
230
230
230
230
Power supply frequency
Hz
50
50
50
50
50
Rated power supply
W
140
165
190
190
215
Net weight
kg
53
53
63
63
63
Dimensions
height mm
950
950
950
950
950
width
mm
600
600
600
600
600
depth
mm
466
466
466
466
466
Protection against humidity and water penetration (**)
—
IP X5D
IP X5D
IP X5D
IP X5D
IP X5D
(*) according to EN 625
(**) according to EN 60529