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10 WILO SE 11/2015
Note: By turning the red button the indication will switch from
W to m³/h. For duty points for which the flow cannot be mea-
sured accurately, the display shows “<” or “>” in front of the
respective value.
Display of the cumulative power consumption in kWh since
commissioning.
Setting the delivery head in m.
Control mode:
Variable differential pressure (Δp-v):
The differential-pressure setpoint H is increased linearly over
the permitted volume flow range between ½H and H (Fig. 2a).
The differential pressure generated by the pump is adjusted to
the corresponding 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 (Δp-c):
The differential-pressure setpoint H is kept constant over the
permitted volume flow range at the set differential-pressure
setpoint up to the maximum pump curve (Fig. 2b). Wilo recom-
mends this control mode for underfloor-heating circuits or
older heating systems with large-sized pipes as well as for all
applications with no changeable pipe system curve, e.g. boiler
charge pumps.
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