German
30 WILO SE 11/2012
intake pressure must be present at the suction side of the
pump!
• Screw the venting screw back in again after 15 to 30 seconds.
• Open the check valve again.
Note: Incomplete bleeding will result in noises in the pump and
unit. Repeat the procedure if necessary.
8.2 Variable speed control
The operating or working points, e.g. of a solar collector, can be
adapted by changing the flow, which is done by switching over
the speed stage of the pump. A rotary knob on the terminal box
is used to switch over to a different speed stage. The small
marking indicates the lowest, and the large marking indicates
the highest speed (Fig. 8).
9Maintenance
DANGER! Risk of fatal injury!
A fatal shock may occur when working on electrical equip-
ment.
• The pump should be electrically isolated and secured against
unauthorised switch-on during any maintenance or repair
work.
• Any damage to the connection cable should always be recti-
fied by a qualified electrician only.
After successful maintenance and repair work, install and con-
nect the pump according to the “Installation and electrical con-
nection” chapter. Switch on the pump according to the
“Commissioning” chapter.
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