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English (US)
8. Control functions
8.1 Description of selected functions
8.1.1
Setpoint
The setpoint for all control modes can be set in this submenu
when the desired control mode has been selected. See section
8.1.2
Operating mode
Possible operating modes:
•
Normal
The pump runs according to the selected control mode.
•
Stop
The pump stops.
•
Min.
The min. curve mode can be used in periods in which a
minimum flow is required.
•
Max.
The max. curve mode can be used in periods in which a
maximum flow is required.
This operating mode is for instance suitable for systems with
hot-water priority.
•
Manual
The pump is operating at a manually set speed.
See section
.
The pump can be set to operate according to the max. or min.
curve, like an uncontrolled pump. See fig. 33.
Fig. 33
Max. and min. curves
8.1.3
Set manual speed
The pump speed can be set in %. When the operating mode has
been set to "
Manual
", the pump will run at the set speed.
8.1.4 Control mode
Possible control modes:
•
Prop. pressure
(proportional differential pressure)
•
Con. diff. press.
(constant differential pressure)
•
Const. curve
(constant curve).
The setpoint for all control modes
can be changed in the
"
Setpoint
" submenu under "
Settings
" when the desired control
mode has been selected.
Proportional pressure
The pump head is reduced at decreasing water demand and
increased at rising water demand. See fig. 34.
This control mode is especially suitable in systems with relatively
large pressure losses in the distribution pipes. The head of the
pump will increase proportionally to the flow in the system to
compensate for the large pressure losses in the distribution
pipes.
The setpoint can be set with an accuracy of 0.14 psi. The head
against a closed valve is half the setpoint, H
set
.
Fig. 34
Proportional pressure
This control mode requires a factory-fitted differential-pressure
sensor as shown in the example below:
Fig. 35
Proportional pressure
Constant differential pressure
The pump maintains a constant differential pressure,
independently of the flow in the system. See fig. 36. This control
mode is primarily suitable for systems with relatively small
pressure losses.
Fig. 36
Constant differential pressure
TM
00
55
47
09
95
6
The operating mode must be set to "
Normal
" before a
control mode can be enabled.
Q
H
Max.
Min.
TM
05 790
9
161
3
Example
• Factory-fitted differential-pressure sensor.
TM
05
79
01
16
13
H
Q
H
set
H
set
2
p
H
Q
