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6.3 Pump performance
Figure 18 shows the relation between pump setting and pump performance by means of curves.
Fig. 18 Pump setting in relation to pump performance
TM07 1541 1618
Setting Pump curve Function
I
Constant curve or constant
speed I
The pump runs at a constant speed and consequently on a constant curve.
At speed I, the pump is set to run on the minimum curve under all operating conditions.
II
Constant curve or constant
speed II
The pump runs at a constant speed and consequently on a constant curve.
At speed II, the pump is set to run on the intermediate curve under all operating conditions.
III
Constant curve or constant
speed III (factory setting)
The pump runs at a constant speed and consequently on a constant curve.
At speed III, the pump is set to run on the maximum curve under all operating conditions.
Quick venting of the pump can be obtained by setting the pump to speed III for a short
period.
Proportional-pressure mode I,
II
The duty point of the pump will move up or down on a proportional-pressure curve,
depending on the heat demand in the system.
The head (pressure) is reduced at falling heat demand and increased at rising heat demand.
Constant-pressure mode I, II
The duty point of the pump will move out or in on a constant-pressure curve, depending on
the heat demand in the system.
The head (pressure) is kept constant, irrespective of the heat demand.
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