“Filling” control mode: 2x wells, 2x pumps, 2x float switches or electrodes

When the fill level in the tank drops and the first switch on-level (ON/OFF1) is reached, the first pump switches on. The tank is filled. When the water level in the tank continues to drop and the second switch on-level (ON/OFF2) is reached, the second pump switches on. The switching cycle is defined by the cable length of the float switch.

When the switch-off levels (ON/OFF2 and ON/OFF1) are reached, the respective pump switches 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 prevent the tank from overflowing, install a float switch or electrode in the tank:

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

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

• If the water level falls below the dry running level, the corresponding pump switches 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.