Operating Principle; Skeleton Diagrams; Shunt Pump - DeDietrich Innovens MCA 35 Installation And Service Manual

3. Technical description
3.3

Operating principle

1
2 3
700
600
573
520
500
445
400
358
300
200
100
0
0 250 500 750
12
7
6
4 5
T002885-A
20 kW
25 kW
30 kW
35 kW
1000 1250 1465
Q (l/h)
835 1038 1252
T001965-A
3.3.1.

Skeleton Diagrams

Heat exchanger (Heating circuit)
1
Heating flow
2
Heating flow (Secondary circuit)
3
Heating return (Secondary circuit)
4
Heating return
5
3-way valve
6
Shunt pump (Heating circuit)
7
3.3.2.

Shunt pump

The boiler is equipped with a circulating pump. This energy-efficient,
modulating circulating pump is controlled by the control unit based on
ΔT. The graph shows the manometric height at various outputs.
Manometric height central heating circuit
H
Water flow
Q
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 81.
MCA 35
15/06/12 - 300022160-001-01