System Sizing - Grundfos CU 301 Installation And Operating Instructions Manual

3.2 System sizing

To ensure the correct function of the system, it is
important that the pump is of the right type.
During operation, CU 301 controls the pump speed
within the range from 3000 min
fig. Pump curves.
We recommend that you follow the guidelines below:
5
2
1
3
Pump curves
Pos. Description
1 Max. head at max. flow
2
Pump curve at 3000 min
3 Min. head at no flow
4
Pump curve at 10,700 min
5 H [m]
Q
6
max
3
7
Q [m /h]
The following must be fulfilled:
1. Minimum head at no flow < static head + system
pressure.
2. Maximum head at maximum flow > dynamic head
+ system pressure.
-1 -1
to 10,700 min . See
4
6
7
-1
-1
11