Technical features and dimensions
7
DUA plus BTN 28
II2H3+
8,9
0,5
3
3,25
85
35
7,5
139,9
0,5
6
60
16
12
8,98
9,98
11,43
13,33
15,99
187
35 - 65
230/50
4
89
X4D
82
l/min
bar
bar
l
°C
°C
l
l
bar
bar
l
l/min.
l/min.
l/min.
l/min.
l/min.
l/min.
l/min.
l
°C
V-Hz
A (F)
W
IP
kg
kW
kW
%
%
%
%
n.
%
%
%
°C
g/s
%
%
mg/kwh
%
%
DUA plus BTN 28
27,9
12,5
89,95
89,89
89,68
87,34
2
92,87
88,88
2,62 - 2,92
64,6 - 83,4
22,05 - 24,3
126,46
2,3 - 4,6
186
2
11,12 - 7,13
0,449
DUA plus BTFS 28
28,8
12,9
92,94
92,92
92,04
90,38
3
94,96
90,74
2,04 - 2,02
60,4 - 69,6
19,51 - 20,55
89,4
2,6 - 5,9
-
-
130
3
11,03 - 6,61
0,489
DUA plus BTFS 28
II2H3+
8,8
0,5
3
3,25
85
35
7,5
139,3
0,5
6
60
16
12
9,1
10,2
11,7
13,6
16,4
187
35 - 65
230/50
4
148,5
X4D
89
1.4 - OPERATIONAL DATA
For some data (NOZZLES - BURNER GAS PRESSURE - DIAPHRAGMS - INPUTS - GAS CONSUMPTIONS)
refer to paragraph ADAPTATION TO THE USE OF OTHER GAS on page 26.
1.5 - GENERAL SPECIFICATIONS
(*) Warning: The utilisation of this type of boilers in the "floor heating systems" needs the use of specific equipments (e.g.:
UNICAL Thermic Module) to avoid all risks of smoke condensation within the boiler.
Nominal output
Minimum output
Actual water efficiency at 100 % of nominal load
Minimum water efficiency required at 100 % of nominal load
Actual water efficiency at 30 % of nominal load
Minimum water efficiency required at 30 % of nominal load
Star number (according to Efficiency Directive 92/42/CE)
Combustion efficiency at 100 % of nominal load
Combustion efficiency at minimum load
Heat losses through the casing (min. / max.)
Maximum net smoke température (Ts- Ta)
Massive smoke flow rate (min. / max.)
Air exces (lambda)
CO
2
NOx (ponderal value according to EN 297/A3+EN 483)
NOx class (ponderal value according to EN 297/A3 + EN 483)
Chimney heat losses with burner in operation (min./max.)
Chimney heat losses with burner shut-off
Boiler category
Minimum water low rate in heating circuit (ΔT 20°C)
Minimum pressure in heating circuit
Maximum pressure in heating circuit
Water content of the primary circuit
Maximum operation temperature in heating mode
Minimum operation temperature in heating mode (*)
Expansion vessel total content
Maximum water content of the heating circuit (max. temp. 90°C)
Minimum pressure in the D.H.W. circuit
Maximum pressure in the D.H.W. circuit
Tank capacity
Specific D.H.W. flow rate ( t 30°C according to EN 625)
Flow rate of the D.H.W. flow restrictor
Contiunuous D.H.W. production with t 45 K
Contiunuous D.H.W. production with t 40 K
Contiunuous D.H.W. production with t 35 K
Contiunuous D.H.W. production with t 30 K
Contiunuous D.H.W. production with t 25 K
DHW available at a temp. of 45°C in the first 10 mins of draw-off with storage
tank water at 60°C and cold water at 10°C (*)
D.H.W. temperature adjustable between
Electrical power supply Tension/Frequency
Supply fuse
Maximum absorbed output
Insulation degree
Net weight (dry)
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