en – Original Instructions
Installation, Operation and Maintenance Manual
35
5.6.8
Dry run protection
This function is available only for some fix speed models. This algorithm protects the unit from
dry running during normal operation.
The pump monitors the input power level and if it drops below a preset value for a specified
time interval, the pump starts a sequence with 9 cycles of 30 s on and 60 s off, then a 10-minute
pause and so on, until the expected power level restored and the pump can continue the normal
operation.
5.6.9
Power Down Reset (PDR)
This function is available only for some fix speed models. This algorithm protects the unit from
dry running during normal operation.
This algorithm is a special version of the dry run protection.
If the expected power level cannot be restored in 3 x 9 cycles, described in the section 5.6.8 Dry
run protection, the pump stops and restarts only after the termination of the power supply.
5.6.10
Temperature sensor error mode
This function is available only for some temperature controlled models. It is activated if the signal
from the water temperature sensor is interrupted. In this case the pump runs in a kind of
emergency mode with repeating the operation cycle of 1 minute running - 1 minute standby
mode. In this situation the pump will not react on the control knob settings anymore, the
operation can only be stopped by disconnecting the power supply.
