Wilo E 15 Serie Notice De Montage Et De Mise En Service page 14

English
8.1 Filling and air venting
Fill and vent the system correctly. The pump rotor chamber
normally vents automatically after a short time in operation.
However, if direct venting of the rotor chamber is required, the
air venting routine can be started.
To do this, turn the red button (fig. 4-a) to select the symbol for
air venting. The duration of the bleeding routine is 10 minutes.
Noises may be heard during the air venting routine. The process
can be stopped if desired by turning red button. At the end of
the process, the pump switches automatically to a pre-set
speed. After that, the desired control mode can be set at the red
button.
8.2 Setting the control mode (fig. 2a, 2b) and delivery head
Turn the red button (fig. 4-a) to select the control mode symbol
and adjust the desired delivery height between 1 m and 5 m.
Variable differential pressure (Δp-v): fig. 2a
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.
Factory setting Δp-v, 5 m
Constant differential pressure (Δp-c): fig. 2b
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.
11 WILO SE 05/2011