3.3.3.
Water flow rate
The boiler's modulating control system limits the maximum difference
in temperature between the heating flow and return and the maximum
speed at which the flow temperature increases. In this way, the boiler
does not require a minimum water flow rate.
Δp
Pressure drop
Q
Water flow (max = 1680 l/h)
3.4
Technical characteristics
Boiler type
MCA 15
MCA 25
MCA 25/28 MI
General
Flow rate setting
Adjustable
Modulating, Start/Stop, 0 - 10 V
Nominal output (Pn)
Heating System (80/60 °C)
minimum-maximum kW
3,0 - 14,5
5,0 - 24,1
5,0 - 24,1
Factory setting
kW
14,5
24,1
19,4
Nominal output (Pn)
Heating System (50/30 °C)
minimum-maximum kW
3,4 - 15,8
5,6 - 25,5
5,6 - 25,5
Factory setting
kW
15,8
25,5
20,5
Nominal output (Pn)
DHW System
minimum-maximum kW
-
-
5,0 - 28,6
Factory setting
kW
-
-
28,6
Nominal input (Qn)
Heating System (Hi)
minimum-maximum kW
3,1 - 15,0
5,2 - 25,0
5,2 - 25,0
Factory setting
kW
15,0
25,0
20,1
Nominal input(Qn)
Heating System (Hs)
minimum-maximum kW
3,4 - 16,7
5,8 - 27,8
5,8 - 27,8
Factory setting
kW
16,7
27,8
22,3
Nominal input (Qnw)
DHW System (Hi)
minimum-maximum kW
-
-
5,2 - 28,0
Factory setting
kW
-
-
28,0
Nominal input (Qnw)
DHW System (Hs)
minimum-maximum kW
-
-
5,8 - 31,1
Factory setting
kW
-
-
31,1
Heating efficiency under full load (Hi) (80/60 °C)
-
%
96,5
96,3
96,3
Heating efficiency under full load (Hi) (50/30 °C)
-
%
105,3
102,0
102,0
Heating efficiency under partial load (Hi) (Return
temperature 60°C)
-
%
94,9
96,1
96,1
Heating efficiency under partial load (EN 92/42)
(Return temperature 30°C)
-
%
108,5
108,0
108,0
Data on the gases and combustion gases
Gas consumption - Natural gas H (G20)
minimum-maximum m
3
/h
0,33 - 1,59 0,55 - 2,65 0,55 - 2,96
Gas consumption - Natural gas L (G25)
minimum-maximum m
3
/h
0,38 - 1,85 0,64 - 3,08 0,64 - 3,45
Gas consumption - Propane G31
minimum-maximum m
3
/h
0,13 - 0,61 0,21 - 1,02 0,21 - 1,15
NOx-Emission per year or (n =1)
mg/kWh 33
38
38
Mass flue gas flow rate
minimum-maximum kg/h
5,3 - 25,2
8,9 - 42,1
8,9 - 47,1
Flue gas temperature
minimum-maximum °C
30 - 65
30 - 80
30 - 85
(1) Front panel removed
T001978-A
0
100
200
300
400
500
600
700
0
500
1037
437
1500
1000
2000
2500
∆
p [
mb
ar
]
Q [l/h]
623
830
∆
T = 20K
10 kW
15 kW
20 kW
25 kW
MCA 15 - MCA 25 MCA 25/28 MI
3. Technical description
29/04/2010 - 300022146-001-B
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