Grundfos alpha2 l - Pump Settings vs. Performance; Understanding Performance Curves

English (GB)
15
11. Pump settings and pump performance
11.1 Relation between pump setting and pump performance
Figure 14 shows the relation between pump setting and pump performance by means of curves. See also section 14. Performance
curves.
Fig. 14 Pump setting in relation to pump performance
TM04 2532 2608
Setting Pump curve Function
PP1
Lowest proportional-
pressure curve
The duty point of the pump will move up or down on the lowest proportional-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is reduced at falling heat demand and increased at rising heat demand.
PP2
(factory setting)
Highest proportional-
pressure curve
The duty point of the pump will move up or down on the highest proportional-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is reduced at falling heat demand and increased at rising heat demand.
CP1
Lowest constant-
pressure curve
The duty point of the pump will move out or in on the lowest constant-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is kept constant, irrespective of the heat demand.
CP2
Highest constant-
pressure curve
The duty point of the pump will move out or in on the highest constant-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is kept constant, irrespective of the heat demand.
III Speed III
The pump runs at a constant speed and consequently on a constant curve.
In speed III, the pump is set to run on the maximum curve under all operating conditions.
See fig. 14.
Quick venting of the pump can be obtained by setting the pump to speed III for a short period.
See section 10.2 Venting the pump.
II Speed II
The pump runs at a constant speed and consequently on a constant curve.
In speed II, the pump is set to run on the intermediate curve under all operating conditions.
See fig. 14.
I Speed I
The pump runs at a constant speed and consequently on a constant curve.
In speed I, the pump is set to run on the minimum curve under all operating conditions. See
fig. 14.
III
II
I
AUTO
PP1
PP2
CP1
CP2
H
Q
ON
POWER