DANGER! Electric shock can kill!
- Before working on the pump, disconnect from the power supply and secure against reconnection.
- Check that no voltage is present.
DANGER! Pressurised system!
- Before working on the motor or pump connections, close the shut-off valves.
WARNING! Risk of scalding due to hot water!
- Avoid direct contact with escaping hot water.
- The pump housing can similarly reach a high temperature due to the hot medium being pumped.
- Whenever the motor is opened up, replace the seal in the pump housing.
For maintenance, first close the shut-off valves.
Unscrew the motor from the pump housing …
… Carefully lift the rotor off the bearing pin.
Using a limescale remover, free the rotor and separating cap of limescale. If necessary, replace the rotor. Use only soft, non-metallic tools (e.g. brush, cloth, toothpick).
Reposition the rotor on the bearing pin.
Remove the old seal.
Insert new seal into the pump housing …
… and reattach the motor to the pump housing.
Retighten the union nut (max. 20 Nm).
Slowly open the shut-off valves again.
To vent any remaining air, switch the pump on and off several times …
… and open the DHW tap several times …
… until the pump runs quietly.