Performance Modes - Grundfos SCALA1 System Instructions Manual

5.7 Performance modes

Different performance modes can be selected for SCALA1. Selecting the correct mode is dependent on the
installation.
There are 3 performance modes for SCALA1:
• self-priming
• air handling
• positive inlet.
The default mode is self-priming, which will be the desired mode for most installations.
Performance mode
Self-priming
1)
Air handling
Positive inlet
1) This performance mode will result in some performance loss and a slight increase in noise level. Refer to technical data for more
information.
Description
The self-priming valve is fully
opened.
When there is air in the
installations, it can accumulate in
the hydraulics. Partially closing the
self-priming valve can provide
assistance.
If the installation has a positive inlet
pressure, the pump is always
primed, and the self-priming valve
can be fully closed.
Benefits
Best performance and lowest noise
level in suction applications.
Improves the pump's capability to
handle air in the water.
Removes sound associated with
self-priming valve movement in
installations with positive inlet
pressure.
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