Grundfos ALPHA1 Notice D'installation Et De Fonctionnement page 13

8.5 Pump performance and operating mode selection
The hydraulic performance shown is without check valve.
H H
[m] [ft]
20
6
18
5
16
14
4
12
10
3
8
2
6
4
1
2
0 0
0 1 2 3
0.0 0.5
Pos. Description
• Push-button for selection of pump setting
• Every time you press the push-button, the circulator setting is changed.
Constant pressure III
III
• The duty point of the pump will move left and right along the highest constant-pressure
curve depending on the water demand in the system.
Constant pressure II
II
• The duty point of the pump will move left and right along the middle constant-pressure
curve depending on the water demand in the system.
Constant pressure I
I
• The duty point of the pump will move left and right along the lowest constant-pressure
curve depending on the water demand in the system.
4 5 6 7 8 9 10
1.0 1.5 2.0
11 12 13 14 15 16 17
2.5 3.0 3.5
Constant Pressure III
Constant Pressure II
Constant Pressure I
Q [US GPM]
18
Q [m³/h]
4.0
13