ProMinent Duodos 20 PPS Assembly And Operating Instructions Manual page 21

The flow volume is reducing.
Cause:
The air pressure is low.
The air lines or additional equipment are
blocked with foreign bodies.
The outlet valve on the discharge side is not
opening normally.
The liquid is mixing with air.
Cavitation will be caused.
There are vibrations.
Ice is forming in the air outlet.
The liquid line, including the filter, is blocked
with foreign bodies.
The outlet opening and/or the silencer of the
pump is blocked with foreign bodies.
The pump is blocked with foreign bodies, e.g.
sludge.
Escape of liquid through the open compressed air outlet (silencer).
Cause:
The diaphragm is faulty.
Unusual noises.
Cause:
The air pressure is too high.
The pump is blocked with foreign bodies, which
are larger than the permitted diameter (< 2 mm).
Unusual vibrations.
Cause:
The connection elements and the fastening of the
pump are loose.
The air pressure is too high.
The different valves are vibrating or fluttering.
Troubleshooting and fault elimination
Recommended measure:
Check the compressor and the configuration of the air
line.
Check and clean the air line and the auxiliary equipment.
Adjust the outlet valve on the discharge side.
Top up liquid if necessary. Check and adjust the configu‐
ration of the line on the suction side if necessary.
Adjust the air supply pressure and the outlet pressure
and reduce the suction capacity.
Adjust the air pressure and the outlet pressure. Reduce
the flow of the inlet valve to adjust the pressure and
volume of the fluid.
Remove ice from the air bypass valve and check and
clean the air filter. Use a longer intermediate pipe in the
exhaust air to prevent ice from forming in the silencer.
Check and clean the liquid line and the filter mesh.
Check and clean the outlet opening and the silencer.
Remove, check and clean the pump housing.
Recommended measure:
Replace the diaphragm.
Recommended measure:
Adjust the air pressure.
Dismantle, check and clean the pump housing.
Recommended measure:
Check each connecting element and tighten the
screws.
Adjust the air pressure.
Adjust the air pressure. Adjust the feed pressure.
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