20
BTN 24
BTFS 24
BTFS 28
BTFS 32
Boiler category
-
II2H3+
II2H3+
II2H3+
II2H3+
Number of burner nozzles
-
12
12
13
15
Minimum CH pressure
bar
0.5
0.5
0.5
0.5
Maximum CH pressure
bar
3
3
3
3
Minimum DHW pressure
bar
0.5
0.5
0.5
0.5
Maximum DHW pressure
bar
8
8
8
8
DHW specific flow rate (ΔT 30K)
l/10’
155
160
180
200
Power supply – voltage/frequency
V ~ Hz
230 ~ 50
230 ~ 50
230 ~ 50
230 ~ 50
Power mains fuse
A
2
2
2
2
Maximum power consumption
W
140
180
200
230
Index of protection
IP
X4D
X4D
X4D
X4D
Methane gas consumption at maximum flow (*)
m3/h
2.72
2.70
3.23
3.46
Butane gas consumption at maximum flow
kg/h
2.02
2.01
2.40
2.62
Propane gas consumption at maximum flow
kg/h
1.99
1.98
2.37
2.51
Maximum CH operating temperature
°C
83
83
83
83
Maximum DHW operating temperature
°C
62
62
62
62
Total capacity of expansion vessel
l
8
8
10
10
Maximum recommended CH system capacity (**)
l
160
160
200
200
Table 7
(*) Value refers to 15°C - 1013 mbar.
(**) Maximum water temperature = 83°C. Expansion vessel pressure pre-charge = 1 bar.
BTN 24
Max output
Min output
30% output
Outer casing heat loss
%
0.8
0.8
-
Flue system heat loss with burner on
%
8.5
9.7
-
Flue system mass capacity
g/s
16.2
13.7
-
Flue temp. - Air temp.
°C
85
50
-
CO
2
%
6.2
3.0
-
Boiler efficiency rate
%
90.7
89.5
88.7
Efficiency class (acc. to 92/42/CE)
-
* *
NOx emissions class
-
2
Table 8
BTFS 24
Max output
Min output
30% output
Outer casing heat loss
%
0.23
0.23
-
Flue system heat loss with burner on
%
6.57
9.67
-
Flue system mass capacity
g/s
14.0
14.4
-
Flue temp. - Air temp.
°C
75
67
-
CO
2
%
7.2
2.8
-
Boiler efficiency rate
%
93.2
90.1
90.2
Efficiency class (acc. to 92/42/CE)
-
* * *
NOx emissions class
-
2
Table 9
BTFS 28
Max output
Min output
30% output
Outer casing heat loss
%
0.23
0.23
-
Flue system heat loss with burner on
%
6.67
8.87
-
Flue system mass capacity
g/s
18.2
18.7
-
Flue temp. - Air temp.
°C
75
45
-
CO
2
%
6.6
2.1
-
Boiler efficiency rate
%
93.1
90.9
90.4
Efficiency class (acc. to 92/42/CE)
-
* * *
NOx emissions class
-
2
Table 10
BTFS 32
Max output
Min output
30% output
Outer casing heat loss
%
0.23
0.23
-
Flue system heat loss with burner on
%
6.67
9.77
-
Flue system mass capacity
g/s
18.9
19.2
-
Flue temp. - Air temp.
°C
92
45
-
CO
2
%
6.9
2.5
-
Boiler efficiency rate
%
93.1
90.0
90.3
Efficiency class (acc. to 92/42/CE)
-
* * *
NOx emissions class
-
2
Table 11
2.5.
Technical specifications
