Additional control functions

These additional control functions are available depending on the application:

• Setback operation
• No-Flow Stop
• Q-Limit_Max
• Q-Limit_Min

Setback operation

If the fluid temperature drops, the pump calculates the setback operation of the heat generator. It reduces the speed and thus the pump output to a minimum.
In factory setting this function has been deactivated and must be activated if applicable.

• Carry out hydronic balancing!

No-Flow Stop

The additional “No-Flow Stop” control function continuously monitors the actual volume flow of the heating/cooling system.
If the volume flow drops below the configured reference volume flow Q_ref, the pump stops. The pump checks every 5 minutes whether the volume flow requirement increases again. If necessary, the pump returns to the previously set control function.
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.
In factory setting this function has been deactivated and must be activated if applicable.

Q-Limit_Max

The additional control function “Q-Limit_Max” can be combined with other control functions (differential pressure control (∆p-v, ∆p-c), cumulated volume flow, temperature control (∆T control, T control)). It makes it possible to limit the maximum volume flow to a set value 10 – 90 % of Q_Max. When the set value is reached, the pump is controlled on the characteristic curve along the limit – never beyond.

• Carry out hydronic balancing!

Q-Limit_Min

The additional control function “Q-Limit_Min” can be combined with other control functions (differential pressure control (∆p-v, ∆p-c), cumulated volume flow, temperature control (∆T control, T control)). It makes it possible to ensure the minimum volume flow to a set value 10 % – 90 % of Q_Max within the hydraulic characteristic curve. When the set value is reached, the pump is controlled on the characteristic curve along the limit until the maximum delivery head is reached.