19
2.5. General characteristics
CTN 24
RTN 24
CTFS 24
RTFS 24
CTFS 28
RTFS 28
Category
-
II2H3+
II2H3+
II2H3+
Burner nozzles
no.
12
12
13
Minimum CH flow rate
l/h
550
550
670
Minimum CH pressure
bar
0.5
0.5
0.5
Maximum CH pressure
bar
3
3
3
Minimum DHW pressure
bar
0.3
-
0.3
-
0.3
-
Maximum DHW pressure
bar
8
-
8
-
8
-
DHW specific capacity (∆t 30 °C)
l/min
11.1
-
11.4
-
13.7
-
Electrical power supply – voltage / frequency
V ~ Hz
230 ~ 50
230 ~ 50
230 ~ 50
Power mains supply fuse
A
2
2
2
Maximum power consumption
W
90
130
150
Net weight
kg
36.5
34.5
40.3
38.0
41.0
38.5
Natural gas consumption (*)
m
3
/h
2.72
2.70
3.23
Butane gas consumption
kg/h
2.02
2.01
2.40
Propane gas consumption
kg/h
1.99
1.98
2.36
Maximum CH working temperature
°C
83
83
83
Maximum DHW working temperature
°C
62
-
62
-
62
-
Total capacity of expansion vessel
l
8
8
8
Maximum recommended CH system capacity (**)
l
160
160
160
No. 6 table - General data for each model
(*) Value related to 15°C – 1013 mbar condition
(**) Maximum water temperature of 83°C, expansion vessel pressure 1 bar
CTN 24 - RTN 24
max heat output
min heat output
30% heat output
Boiler 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 rating (according to 92/42/CE)
-
★★
NO
x
emission class
-
2
CTFS 24 - RTFS 24
max heat output
min heat output
30% heat output
Boiler casing heat loss
%
0.23
0.23
-
Flue system heat loss with burner on
%
6.57
9.27
-
Flue system mass capacity
g/s
12.9
14.0
-
Flue temp.– air temp.
°C
98
60
-
CO
2
%
7.7
2.9
-
Boiler efficiency rate
%
93.2
90.5
90.2
Efficiency rating (according to 92/42/CE)
-
★★★
NO
x
emission class
-
2
CTFS 28 - RTFS 28
max heat output
min heat output
30% heat output
Boiler casing heat loss
%
0.2
-
-
Flue system heat loss with burner on
%
6.1
8.5
-
Flue system mass capacity
g/s
17.7
19.1
-
Flue temp.– air temp.
°C
86
57
-
CO
2
%
7.1
2.7
-
Boiler efficiency rate
%
93.7
91.5
91.2
Efficiency rating (according to 92/42/CE)
-
★★★
NO
x
emission class
-
3
No. 7 table - Combustion data for CTN 24 and RTN 24
No. 8 table - Combustion data for CTFS 24 and RTFS 24
No. 9 table - Combustion data for CTFS 28 and RTFS 28
