English (GB)
15
6.4 Pump performance
Figure
shows the relation between pump setting and pump performance by means of curves.
Fig. 19
Pump setting in relation to pump performance
T
M
06
88
18
12
17
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
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.
Radiator heating mode
(proportional-pressure curve)
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.
Underfloor heating mode
(constant-pressure curve)
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.
III
II
I
H
Q
