“Drain” control mode: 1x well, 2x pumps, 3 float switches or electrodes

When the fill level in the well rises and the first switch on-level (ON1) is reached, the first pump switches on. The well is drained. When the water level in the well continues to rise and the second switch on-level (ON2) is reached, the second pump switches on.

When the switch-off level (OFF) is reached, all pumps switch off after the set switch-off delay has elapsed. NOTICE! The base-load and peak-load pumps are cycled alternately (see menu 5.60).

To protect the pumps from a dry run, install an additional float switch or electrode in the well:

• If the water level falls below the dry-running level, the pumps switch off. An error message appears on the display and an alarm sounds.
• If the dry-running level is exceeded, the alarm and error message are automatically reset.