Pump Control - Grundfos ALPHA+ Montage- Und Betriebsanleitung

6.3 Pump control

During operation, the pump head will be changed according to the prin-
ciple "proportional-pressure control". In this control mode, the pump per-
formance, and consequently the power consumption, is adjusted to the
actual water requirement.
s
An example is shown in . In the example, the pump duty point is
changed from (1) to (2) because of a changed system characteristic
(thermostatic valves are closed) and consequently a lower water re-
quirement.
7. Technical data
Supply voltage: 1 x 230 V –10%/+6%, 50 Hz, PE.
Motor protection: The pump requires no external motor protection.
Enclosure class: IP 42.
Insulation class: F.
Relative air humidity: Maximum 95%.
Ambient temperature: 0°C to +40°C.
Temperature class: TF110 to CEN 335-2-51.
Liquid temperature: +2°C to +110°C.
Pumps in domestic hot-water systems: Continuously: +15°C to +60°C.
To avoid condensation in the terminal box and the stator, the pumped
liquid temperature must always be higher than the ambient temperature.
See the table below:
Ambient temperature [°C]
0
10
20
30
35
40
60*
* At these temperatures, the pump life may be reduced.
Liquid temperature
Min. [°C] Max. [°C]
2 110
10 110
20 110
30 110
35 90
40 70
60* 70*
95