No-Flow Stop

The additional control function “No-Flow Stop” continuously monitors the actual volume flow of the heating/cooling system.
If the volume flow decreases due to closing valves and falls below the “No-Flow Stop Limit” threshold set for No-Flow Stop, the pump is stopped.
The pump checks every 5 minutes (300 s) whether the volume flow demand is increasing again. When the volume flow increases again, the pump continues running in its set control mode in normal operation.

NOTICE

A volume flow increase relative to the set minimum volume flow “No-Flow Stop Limit” is checked within a time interval of 10 s.

NOTICE

The test time of 5 minutes is permanently set and cannot be adjusted.

The reference volume flow Q_ref can be set between 1% and 20% of the maximum volume flow Q_Max depending on the pump size.

Field of application of No-Flow Stop:

A pump in a consumer circuit with control valves in heating or cooling (with radiators, fan heaters, air-conditioning devices, underfloor heating/cooling, ceiling heating/cooling, concrete core heating/cooling) as an additional function for all control modes except Multi-Flow Adaptation and volume flow Q-const.

NOTICE

This function is deactivated in the factory settings and must be activated if required.

NOTICE

The additional control function “No-Flow Stop” is an energy-saving function. Reducing unnecessary running times saves electrical pumping energy.

NOTICE

The additional “No-Flow Stop” control function is available for suitable applications only! The additional control function “No-Flow Stop” cannot be combined with the additional control function “Q-Limit_Min”!