CAUTION! Ingress of water will cause physical damage!

  • Ensure that the cable entry and cable face downwards after installation.
  • Select a suitable installation site and permissible installation position.

  • Avoid exposing pumps with thermostatic functions, such as the ERT or SL, to heat:
    – Maintain a clearance of at least 50 cm from the DHW heater.
    – If the return line opens vertically into the cylinder, install the pump well away from the cylinder entry.

  • Fit shut-off valves and a non-return valve (Δpmax = 0.2 kPa or 20 mbar).

  • The integrated shut-off valve in the V-pump housing and the Vortex screw-in valves are only provided to enable a brief shut-off while the motor is replaced.
  • Integral valves on V pumps

  • Optional screw-in valves on R pumps (W-valves)

  • Integral screw-in valves on BWO 155 RW pump
  • Optional screw-in valves on R pumps (RV 153, KV 150)

  • When installing the pump, ensure that it is not under strain.

  • Observe correct direction of flow.

DANGER! Pressurised system!

  • Before working on the motor or pump connections, close the shut-off valves.

  • Rotate the pump control panel if necessary so that it is visible (cable exit underneath). To do so, slightly loosen the union nut …

  • … turn the motor …

  • … and retighten the union nut (max. 20 Nm).

  1. Fully separating the motor from the pump housing is only necessary for maintenance purposes (see chapters ‘Flushing and venting’ and ‘Maintenance’).
  2. The pump has dry-running protection. If it runs largely in air, the PCB will repeatedly stop it to protect the rotor bearings. In a fully vented circulation circuit, the pump will run uninterrupted.