21
INSTALLATORUSER
MAINTENANCE TECHNICIAN
3.19 COMBUSTION PARAMETERS.
- e data relevant to domestic hot water perfor-
mance refer to a dynamic inlet pressure of 2 bar
and an inlet temperature of 15°C; the values are
measured directly at the boiler outlet consider-
ing that to obtain the data declared mixing with
cold water is necessary.
- *Specic ow rate ‘’D’’: domestic hot water ow
rate corresponding to an average temperature
increase of 30K, which the boiler can supply in
two successive withdrawals.
3.20 TECHNICAL DATA.
Nominal heat input kW (kcal/h) 26.2 (22492)
DHW minimum heat input kW (kcal/h) 8.3 (7116)
CH minimum heat input kW (kcal/h) 10.9 (9357)
Nominal heat output (useful) kW (kcal/h) 23.8 (20468)
DHW minimum heat output (useful) kW (kcal/h) 7.0 (6020)
CH minimum heat output (useful) kW (kcal/h) 9.4 (8084)
Eciency at nominal heat output % 91.0
Eciency at 30% nominal heat output load % 89.3
Heat loss at case with burner On/O % 2.30 / 1.20
Heat loss at ue with burner On/O % 6.70 / 0.09
Central heating circuit max. operating pressure bar 3
Central heating circuit max. operating temperature °C 90
Adjustable central heating temperature °C 35 - 85
System expansion vessel total volume l 4.0
Expansion vessel factory-set pressure bar 1
Water content in generator l 2.5
Total head available with 1000 l/h ow rate kPa (m H
2
O) 24.52 (2.5)
Hot water production useful heat output kW (kcal/h) 23.8 (20468)
Domestic hot water adjustable temperature °C 30 - 60
Domestic hot water circuit ow limiter at 2 bar l/min 7.1
Min. pressure (dynamic) domestic hot water circuit bar 0.3
Domestic hot water circuit max. working pressure bar 10
Minimum D.H.W. ow rate l/min 1.5
Specic ow rate (∆T 30°C) l/min 11.1
*Specic ow rate “D” according to EN 625 l/min 19.9
Drawing capacity in continuous duty (∆T 30°C) l/min 11.4
Weight of full boiler kg 28.6
Weight of empty boiler kg 26.1
Electrical connection V/Hz 230/50
Power input A 0.44
Installed electric power W 95
Pump consumption W 87
Equipment electrical system protection - IPX4D
Boiler ue circuit resistance Pa 1.3
NO
X
class - 3
Weighted NO
X
mg/kWh 143
Weighted CO mg/kWh 37
Type of appliance B11BS
Category II2H3+
G20 G30 G31
Gas nozzle diameter mm 1.30 0.79 0.79
Supply pressure mbar (mm H
2
O) 20 (204) 29 (296) 37 (377)
Flue ow rate at nominal heat output kg/h 73 75 74
Flue ow rate at min heat output kg/h 61 57 58
CO
2
at Q. Nom./Min. % 5.00 / 1.80 5.65 / 2.25 5.70 / 2.20
CO with 0% O
2
at Q. Nom./Min. ppm 95 / 60 125 / 75 115 / 69
NO
X
with 0% O
2
at Q. Nom./Min. mg/kWh 245 / 125 362 / 152 338 / 176
Flue temperature at nominal output °C 94 94 95
Flue temperature at minimum output °C 77 81 84