Pump Setting - Grundfos MAGNA1 Series Installation And Operating Instructions Manual

8.1 Pump setting

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Fig. 20 Selection of pump setting for system type
Factory setting: Intermediate proportional-pressure curve,
referred to as PP2.
Proportional-pressure curve (PP1, PP2 or PP3)
Proportional-pressure control adjusts the pump performance to
the actual heat demand in the system, but the pump performance
follows the selected performance curve, PP1, PP2 or PP3.
See fig. 21 where PP2 has been selected. See section
9. Selection of control mode for further information.
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Fig. 21 Three proportional-pressure curves/settings
The selection of the right proportional-pressure setting depends
on the characteristics of the heating system in question and the
actual heat demand.
Constant-pressure curve (CP1, CP2 or CP3)
Constant-pressure control adjusts the pump performance to the
actual heat demand in the system, but the pump performance
follows the selected performance curve, CP1, CP2 or CP3.
See fig. 22 where CP1 has been selected.
See section 9. Selection of control mode for further information.
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Fig. 22 Three constant-pressure curves/settings
The selection of the right constant-pressure setting depends on
the characteristics of the heating system in question and the
actual heat demand.
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PP3
PP2
PP1
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CP3
CP2
CP1
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Constant curve/constant speed (I, II or III)
At constant-curve/constant-speed operation, the pump runs at a
constant speed, independent of the actual flow demand in the
system. The pump performance follows the selected performance
curve, I, II or III. See fig. 23 where II has been selected.
See section 9. Selection of control mode for further information.
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Fig. 23 Three constant-curve/constant-speed settings
The selection of the right constant-curve/constant-speed setting
depends on the characteristics of the heating system in question.
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