Operating Principle; Skeleton Diagrams; Shunt Pump - DeDietrich Innovens MCA 15 Installation And Service Manual

3. Technical description
3.3

Operating principle

1
2
3
4 5
700
10 kW
615
600
545
500
435
400
300
295
200
100
0
0 200 400 600
437 623
12
10
9
8
6 7
T001868-B
15 kW
20 kW
25 kW
800 1000 1200
Q (l/h)
830 1037
T002537-B
Expansion vessel
20
Ignition/ionization electrode
21
Air intake
22
3.3.1.

Skeleton Diagrams

Heat exchanger (Heating circuit)
1
Hydrobloc
2
Plate heat exchanger (DHW circuit) (Only on models with
3
domestic hot water production)
Heating flow
4
Domestic hot water outlet
5
Domestic cold water inlet
6
Heating return
7
Inverter valve
8
Shunt pump (Heating circuit)
9
Expansion vessel
10
3.3.2.

Shunt pump

Manometric height central heating circuit
H
Water flow
Q
The boiler is fitted with a modulating pump which is regulated by the
control panel as a fuction of ΔT.
The graph shows the manometric height at various outputs. The
parameters MIN.PUMP SPEED and MAX.PUMP SPEED are used to
modify the pump settings. If flow noise can be heard in the system, it
is possible to reduce the maximum pump speed with the parameter
MAX.PUMP SPEED (First of all, vent the heating system). If
circulation in the radiators is too low or the radiators do not fully heat
up, increase the minimum pump speed with the parameter
MIN.PUMP SPEED.
¼ See chapter: ""Professional" settings", page 82.
MCA 15 - MCA 25 MCA 25/28 MI
29/04/2010 - 300022146-001-B