24
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.18 COMBUSTION PARAMETERS.
- The data relevant to domestic hot water per-
formance refers to a dynamic inlet pressure
of 2 bar and an inlet temperature of 15°C; the
values are measured directly at the boiler outlet
considering that to obtain the data declared
mixing with cold water is necessary.
3.19 TECHNICAL DATA.
Nominal heat input
kW (kcal/h)
25.9 (22279)
Minimum DHW heat input
kW (kcal/h)
8.1 (6968)
CH minimum heat input
kW (kcal/h)
10.8 (9300)
Nominal heat output (useful)
kW (kcal/h)
23.6 (20296)
DHW minimum heat output (useful)
kW (kcal/h)
7.0 (6020)
CH minimum heat output (useful)
kW (kcal/h)
9.5 (8170)
* Efficiency at nominal heat output
%
91.1
* Efficiency at 30% nominal heat output load
%
86.6
Heat loss at case with burner On/Off
%
2.10 / 1.05
Heat loss at flue with burner On/Off
%
6.80 / 0.47
Central heating circuit max. operating pressure
bar
3
Maximum central heating temperature
°C
90
Adjustable central heating temperature
°C
35 - 80
System expansion vessel total volume
l
4.2
Expansion vessel factory-set pressure
bar
1
Appliance water content
l
0.7
Head available with 1000 l/h flow rate
kPa (m H
2
O)
30,92 (3.20)
Hot water production useful heat output
kW (kcal/h)
23.6 (20296)
Domestic hot water adjustable temperature
°C
35 - 55
Domestic hot water circuit min. pressure (dynamic)
bar
0.3
Domestic hot water circuit max. operating pressure
bar
10
Minimum D.H.W. flow rate
l/min
2.0
Flow rate capacity in continuous duty (∆T 30°C)
l/min
11.1
Weight of full boiler
kg
25.3
Weight of empty boiler
kg
24.6
Electrical connection
V/Hz
230/50
Nominal power absorption
A
0.38
Installed electric power
W
55
Pump absorbed power
W
39
EEI
-
≤ 0.20 - Part. 3
Equipment electrical system protection
-
IPX4D
Boiler flue circuit resistance
Pa
1.3
NO
X
class
-
2
Weighted NO
X
mg/kWh
154
Weighted CO
mg/kWh
33
Type of appliance
B11BS
Category
II2H3+
G20
G30
G31
Gas nozzle diameter
mm
1.30
0.80
0.80
supply pressure
mbar (mm H
2
O)
20 (204)
29 (296)
37 (377)
Flue flow rate at nominal heat output
kg/h
68
65
69
Flue flow rate at min heat output
kg/h
61
60
69
CO
2
at Nom./Min. Q.
%
5.35 / 1.78
6.50 / 2.10
6.10 / 1.80
CO with 0% O
2
at Nom./Min. Q.
ppm
79 / 86
151 / 100
95 / 137
NO
X
with 0% O
2
at Nom./Min. Q.
ppm
58 / 12
110 / 15
97 / 12
Flue temperature at nominal output
°C
101
106
102
Flue temperature at minimum output
°C
85
85
76
- * Efficiencies refer to the lower heating value.
Combustion parameters: measuring conditions
of useful efficiency (flow temperature/return
temperature= 80 / 60 °C), ambient temperature
reference = 15°C.
