Dry-Running Protection; Commissioning - Wilo Actun OPTI-QS Serie Instrucciones De Instalación Y Funcionamiento

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6.5.

Dry-running protection

Fig. 7.: Positioning the water level sensor
1 Unit
2 Water level sensor
Submersible pumps are cooled by the fluid. Therefore, the motor must always be
immersed. In addition, it is also important to ensure that no air enters the hydraulics
housing. The pump must therefore always be immersed in the fluid up to the top edge
of the hydraulics housing. For optimum operational reliability, we recommend installing
a dry-running protection system.
In the event of installation of the water level sensor on the ascending pipe, make sure
that it is not exposed to water running down the ascending pipe. Use a suitable well
cover to protect the ascending pipe from penetrating rainwater!
Automatic restart after dry run
The motor immediately stops if dry-running protection is triggered. The integrated
electronics system attempts to restart the motor at 5-minute intervals until correct
operating conditions have been re-established.
7.

Commissioning

The "Commissioning" section contains all the important instructions for the operating
personnel for starting up and operating the pump.
The following general conditions must always be met and checked:
• Installation type, including cooling (does a cooling shroud have to be installed?)
• Minimum water submersion / Max. immersion depth
These general conditions must also be checked after a long period without operati-
on, and any defects detected must be repaired!
Always keep this manual either by the pump or in a place specially reserved for it, where
it is accessible for the entire operating personnel at all times.
In order to prevent damage or serious injury when commissioning the pump, the fol-
lowing must be observed:
• Commissioning of the pump may only be carried out by qualified and trained personnel
in accordance with the safety instructions.
• All persons working on or with the pump must have received, read, and understood this
operating and maintenance manual.
• All safety devices and emergency cut-outs must be connected and checked to ensure
that they work properly.
• Electrical and mechanical adjustments must be made by qualified personnel.
• The pump is suitable for use under the specified operating conditions.
70
A Water level sensor identifies: Water available
8 Water level sensor identifies: No water
COMMISSIONING
WILO SE 02-2019 DIN A5