Dual-Pump Operation (Dual) - KSB CalioTherm Pro 25 Installation & Operating Manual

7 Operation
Table 26: Number of lit LED segments assigned to voltage
Number of lit LED segments
0
1
2
3
4
5
6
7
8
9
10
NOTE
To start the pump the "RUN" terminal pair must be bridged (factory setting) or the
terminal pair must receive the START signal.

7.3.3 Dual-pump operation (DUAL)

Function
Activating the DUAL function starts dual-pump operation. After a few seconds, the
duty/stand-by operating mode becomes active and will stop one of the pumps. The
pump which remains active (on duty) is operated at 0 - 100 %; the other pump is on
stand-by.
The remote ON/OFF function is de-activated for the stand-by pump, irrespective of
the wiring of the RUN terminal pair. The duty pump can be controlled by means of
the 0 - 10 V operating mode or the integrated remote ON/OFF function.
Automatic pump The pump sets come with an integrated timer that stops the duty pump set after
changeover 24 hours of operation and starts up the stand-by pump. To this effect, before the
duty pump is stopped it signals a start command to the stand-by pump. The stand-by
pump will be started up and the first pump will be stopped.
Redundant operation In the event of a failure of the duty pump the stand-by pump will be started up
automatically and will take over the function of the failed pump.
The pump changeover function and the redundant operation function are performed
automatically.
Peak load In Peak Load function either one pump set is running in redundant operation or two
pump sets are running in parallel. A second pump set is started up in the following
cases:
▪ The overall efficiency of the system with two pump sets running in parallel is
▪ The set head is not reached by one pump alone.
The Peak Load function is described in the KSB ServiceTool supplementary operating
manual (reference number 1157.801).
Setting
Press the control element to activate the display from idle mode. The display will
show the current operating mode as well as, in alternation, the electrical input
power and the flow rate. If 5 minutes pass without any settings being made or the
control button being pressed, the display will revert to idle mode.
CalioTherm Pro
higher than with a single pump running.
Voltage
[V]
2,4
3,2
4,0
4,8
5,6
6,4
7,2
8,0
8,8
9,6
10,0
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