Wilo -Stratos PICO series Einbau- Und Betriebsanleitung Seite 30

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8.3 Setting the control mode (Fig. 2)
Press and turn the red button to select the symbol of the con-
trol mode. Press and turn it again to select between the control
modes.
Variable differential pressure ( 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 ( 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. Wilo recommends this
control mode for underfloor heating circuits or older heating
systems with large-sized pipes.
8.4 Activation of the setback operation
Press and turn the red button to select the symbol for the set-
back operation. Press and turn it again to activate (ON) or deac-
tivate (OFF) the setback operation.
When setback operation is enabled, the pump follows the set-
back operation of the heating system with electronic evalua-
tion of a temperature sensor. It then switches to minimum
speed. When the heat generator heats up again, the pump
switches back to the pre-set setpoint stage.
Factory setting: Setback operation OFF
26 WILO SE 10/2009