Operating Mode - Grundfos IO Instrucciones De Instalación Y Funcionamiento

3.1 Operating mode

The user has to decide which operating mode to use
for the actual system.
Possible operating modes:
• single-pit mode
• multi-pit mode.
The pump is factory-set to operate in single-pit
mode.
If the system is to operate in multi-pit mode, contact
your local Grundfos company.
Single-pit mode and multi-pit mode
Caution
cannot operate at the same time.
3.1.1 Single-pit mode
In single-pit mode, all pumps (up to four) connected
to the CIU unit are installed in the same pit. The load
is automatically distributed on the pumps as they are
operating alternately. If the flow into the pit is
increased, a second pump is automatically started
(parallel operation). See fig. 2.
Single-pit mode
Fig. 2
10
3.1.2 Multi-pit mode
In multi-pit mode, the pumps connected to the
CIU unit are installed in separate pump pits (up to
four). A CIU unit can monitor up to four pumps.
See fig. 3.
Fig. 3
In multi-pit mode, the CIU unit regards the connected
pumps as four systems with their own settings.
If the system is to operate in multi-pit mode, contact
CIU
your local Grundfos company.
Multi-pit mode
CIU