Electrical connec

  1. The pump is driven by a DC motor.
  2. The transformer for AC operation is built into the connection cap.
  3. As it is in protection class 2, no earth conductor is required.


DANGER! Electric shock can kill!

  • Work on the electrics must be carried out only by authorised contractors. 
  • Disconnect the pump from the power supply and secure against reconnection.
  • Check that no voltage is present.


WARNING! Risk of fire due to electrical ignition!

  • Ensure that the pump is connected only to the power supply specified on the type plate.
  • Protect 12 V DC pumps with a 2 A fuse.



  • A permanent connection to the power supply is possible; alternatively use a mains plug with IP 44 rating (provide all-pole disconnection).
  • Round cable diameter 5–8 mm
  • Wire cross-section 0.75–1.5 mm2
  • Strip 8.5–10 mm of insulator from the ends of the wires.
  • Twist the wire ends; do not use wire-end sleeves or tinned ends.

  • Undo the module cap with a TX10 screwdriver.

  • Undo the cap nut and insert the cable.

  • Push yellow lever forward and insert the wire into the red cable terminal. Release the lever again.

  • Allow a suitable length of cable and retighten the cap nut.

  • Adjust speed by turning the rotating yellow knob:
    1 = min. speed (2000 rpm)
    2 = medium speed (2500 rpm = factory setting)
    3 = max. speed (3000 rpm), or use any intermediate position.

  • Screw the module cap on firmly.

  • 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.