English
30
Speck 02/2014
Variable differential pressure (
Δ
p-v):
Factory settings
The differential pressure setpoint is increased linearly over the
permitted volume flow range between ½H and H. The differen-
tial pressure generated by the pump is adjusted to the corre-
sponding differential pressure setpoint. This control mode is
especially useful in heating systems with radiators, since the
flow noises at the thermostatic valves are reduced.
Constant differential pressure (
Δ
p-c):
The differential pressure setpoint is kept constant over the per-
mitted volume flow range at the set differential pressure set-
point up to the maximum pump curve. It is recommended to use
this control mode for underfloor heating circuits or older heat-
ing systems with large-sized pipes.
8.4
Activation of the Auto-Pilot function
Press and turn the white button to select the symbol for the
Auto-Pilot function.
Press and turn again to activate
or deactivate Auto-Pilot.
Confirm setting by pressing the white button.
Auto-Pilot is the dynamic adaptation of the setpoint in the
pump's partial load range at less than half of the intended flow
volume. Starting from the set value, the pump analyses the heat
requirement, and, based on this analysis, the established set-
point is continuously corrected operating in partial load mode.
In this way, the pump output in a control range (Fig. 2a) is conti-
nuously optimised up to the energetic minimum. For very small
volume flows, the pump goes into a hydraulic standby for this. If
the volume flow increases due to higher heat requirement, the
performance will increase automatically. The short reaction time
prevents the heating system from being undersupplied.
