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    Which cistern for rainwater utilisation?
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    How can rainwater be collected?
    Find out here why you should filter your rainwater.
    What can I use rainwater for at home and in the garden?
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  3. How do I vent a submersible pump in the cistern?
  1. Table of contents
  2. How can a submersible pump be removed from the cistern?
  3. Venting a submersible pump

How do I vent a submersible pump in the cistern?

WISY AG · Last updated: 12.09.2024
Worth knowing | Assembly & Instructions · 5 min. reading duration

Venting a submersible pump is essential before the first start. Here is how to do it right:

How do I vent a submersible pump in the cistern?
WISY AG
Rainwater Harvesting & Industrial Filtration
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Why does a pump need to be vented?

Pumps must be primed to ensure that no air remains in the system. Air bubbles can impede the flow of water and prevent the pump from performing at its maximum capacity. If a pump is not vented correctly, this can lead to the following problems:

  • Reduced efficiency: The pump cannot perform at full capacity as air bubbles block the water flow.
  • Overheating: Without sufficient water flow, the pump can overheat and be damaged.
  • Loud operation: Air in the system can cause the pump to operate louder and make unusual noises.
  • Damage to the pump: Long-term damage can occur if the pump is operated regularly without sufficient ventilation.
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Observe precautionary measures

Before you start working on your pump, you should observe the following safety precautions:

  • Disconnect the pump from the power supply to avoid short circuits and to protect your health.
  • Read the operating instructions carefully, as models may differ.

How can a submersible pump be removed from the cistern?

It is especially important NOT to lift a submersible pump by the power cable or pull it out of the cistern! The sealing between pump and cable can easily become untight and water may enter the motor. This will lead to not repairable loss of the pump.

Lifting rope for lifting and as tilt protection

Attach the lifting rope that is supplied, to the submersible pump so that it can be lowered and lifted again. The lifting rope is secured in the dome shaft of the cistern and protects the pump from tipping over.

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Venting a submersible pump

BEFORE first commissioning, the submersible pump should be vented to ensure proper functioning. This is done by filling it with water so that it can work optimally. Place the pump under water for about two minutes horizontally with the help of the lifting rope On the pressure side flush the pipe before connecting the submersible pump to the house piping system. The piping must be flushed. Often there is dirt in the pipes from the construction work that must be removed. It would otherwise be carried to the connected consumers.

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