ProMinent EXtronic EXBb Operating Instructions Manual page 32

Start up
Filling the liquid end, rough bleeding
Bleeding the liquid end
Bleeding the liquid end
32
1. Disconnect discharge line from liquid end.
2. Switch on pump using mains switch and allow it to run at
maximum stroke length and stroke rate until the liquid end is
filled completely and free of bubbles.
3. Switch off the pump.
4. Connect discharge line to liquid end.
ð The pump is now ready for operation.
... with liquid end WITH bleed valve:
1. Open the bleed valve (5) (by turning the star-shaped handle
once in a counter-clockwise direction).
2. Switch on pump using mains switch and allow it to run at
maximum stroke length and stroke rate until the liquid end is
filled completely and free of bubbles (as soon as the feed
chemical can be seen in the bleed and/or discharge line).
3. Close the bleed valve.
4. Switch off the pump.
ð The pump is now ready for operation.
... if the pump is pumping into a pressure system and has drawn in
air:
1. Set the discharge-side bleed valve: Release the metering line
or open the bleed valve.
2. Switch on pump and vent with 100% stroke length.
... with HV version:
Initial priming and bleeding is hampered by the fact that the valves
and valve springs are still dry. Therefore:
Use as short a priming lift as possible or for the feed / priming
pressure, bleed on the suction side and liquid end.
If this doesn't help:
1. Unscrew the pressure connector and push the balls away
from the O-ring.
2. Fill the liquid end with water or a suitable medium.
3. Fit pressure connector without valve springs.
4. Attach a short PVC hose piece (100 mm) to the hose nozzle
and half fill with water or a suitable medium.
5. Allow the pump to run at maximum stroke length until the
feed chemical appears in the hose.
6. Re-insert the valve springs – prevent it from tilting by placing
a mandrel (with a diameter of approx. 4 mm) through the dis‐
charge valve. This holds the springs in a central position.
7. Re connect the discharge line.